/** * @file Contains all dynamic functionality needed on post and term pages. * * @output wp-admin/js/post.js */ /* global ajaxurl, wpAjax, postboxes, pagenow, tinymce, alert, deleteUserSetting, ClipboardJS */ /* global theList:true, theExtraList:true, getUserSetting, setUserSetting, commentReply, commentsBox */ /* global WPSetThumbnailHTML, wptitlehint */ // Backward compatibility: prevent fatal errors. window.makeSlugeditClickable = window.editPermalink = function(){}; // Make sure the wp object exists. window.wp = window.wp || {}; ( function( $ ) { var titleHasFocus = false, __ = wp.i18n.__; /** * Control loading of comments on the post and term edit pages. * * @type {{st: number, get: commentsBox.get, load: commentsBox.load}} * * @namespace commentsBox */ window.commentsBox = { // Comment offset to use when fetching new comments. st : 0, /** * Fetch comments using Ajax and display them in the box. * * @memberof commentsBox * * @param {number} total Total number of comments for this post. * @param {number} num Optional. Number of comments to fetch, defaults to 20. * @return {boolean} Always returns false. */ get : function(total, num) { var st = this.st, data; if ( ! num ) num = 20; this.st += num; this.total = total; $( '#commentsdiv .spinner' ).addClass( 'is-active' ); data = { 'action' : 'get-comments', 'mode' : 'single', '_ajax_nonce' : $('#add_comment_nonce').val(), 'p' : $('#post_ID').val(), 'start' : st, 'number' : num }; $.post( ajaxurl, data, function(r) { r = wpAjax.parseAjaxResponse(r); $('#commentsdiv .widefat').show(); $( '#commentsdiv .spinner' ).removeClass( 'is-active' ); if ( 'object' == typeof r && r.responses[0] ) { $('#the-comment-list').append( r.responses[0].data ); theList = theExtraList = null; $( 'a[className*=\':\']' ).off(); // If the offset is over the total number of comments we cannot fetch any more, so hide the button. if ( commentsBox.st > commentsBox.total ) $('#show-comments').hide(); else $('#show-comments').show().children('a').text( __( 'Show more comments' ) ); return; } else if ( 1 == r ) { $('#show-comments').text( __( 'No more comments found.' ) ); return; } $('#the-comment-list').append(''+wpAjax.broken+''); } ); return false; }, /** * Load the next batch of comments. * * @memberof commentsBox * * @param {number} total Total number of comments to load. */ load: function(total){ this.st = jQuery('#the-comment-list tr.comment:visible').length; this.get(total); } }; /** * Overwrite the content of the Featured Image postbox * * @param {string} html New HTML to be displayed in the content area of the postbox. * * @global */ window.WPSetThumbnailHTML = function(html){ $('.inside', '#postimagediv').html(html); }; /** * Set the Image ID of the Featured Image * * @param {number} id The post_id of the image to use as Featured Image. * * @global */ window.WPSetThumbnailID = function(id){ var field = $('input[value="_thumbnail_id"]', '#list-table'); if ( field.length > 0 ) { $('#meta\\[' + field.attr('id').match(/[0-9]+/) + '\\]\\[value\\]').text(id); } }; /** * Remove the Featured Image * * @param {string} nonce Nonce to use in the request. * * @global */ window.WPRemoveThumbnail = function(nonce){ $.post( ajaxurl, { action: 'set-post-thumbnail', post_id: $( '#post_ID' ).val(), thumbnail_id: -1, _ajax_nonce: nonce, cookie: encodeURIComponent( document.cookie ) }, /** * Handle server response * * @param {string} str Response, will be '0' when an error occurred otherwise contains link to add Featured Image. */ function(str){ if ( str == '0' ) { alert( __( 'Could not set that as the thumbnail image. Try a different attachment.' ) ); } else { WPSetThumbnailHTML(str); } } ); }; /** * Heartbeat locks. * * Used to lock editing of an object by only one user at a time. * * When the user does not send a heartbeat in a heartbeat-time * the user is no longer editing and another user can start editing. */ $(document).on( 'heartbeat-send.refresh-lock', function( e, data ) { var lock = $('#active_post_lock').val(), post_id = $('#post_ID').val(), send = {}; if ( ! post_id || ! $('#post-lock-dialog').length ) return; send.post_id = post_id; if ( lock ) send.lock = lock; data['wp-refresh-post-lock'] = send; }).on( 'heartbeat-tick.refresh-lock', function( e, data ) { // Post locks: update the lock string or show the dialog if somebody has taken over editing. var received, wrap, avatar; if ( data['wp-refresh-post-lock'] ) { received = data['wp-refresh-post-lock']; if ( received.lock_error ) { // Show "editing taken over" message. wrap = $('#post-lock-dialog'); if ( wrap.length && ! wrap.is(':visible') ) { if ( wp.autosave ) { // Save the latest changes and disable. $(document).one( 'heartbeat-tick', function() { wp.autosave.server.suspend(); wrap.removeClass('saving').addClass('saved'); $(window).off( 'beforeunload.edit-post' ); }); wrap.addClass('saving'); wp.autosave.server.triggerSave(); } if ( received.lock_error.avatar_src ) { avatar = $( '', { 'class': 'avatar avatar-64 photo', width: 64, height: 64, alt: '', src: received.lock_error.avatar_src, srcset: received.lock_error.avatar_src_2x ? received.lock_error.avatar_src_2x + ' 2x' : undefined } ); wrap.find('div.post-locked-avatar').empty().append( avatar ); } wrap.show().find('.currently-editing').text( received.lock_error.text ); wrap.find('.wp-tab-first').trigger( 'focus' ); } } else if ( received.new_lock ) { $('#active_post_lock').val( received.new_lock ); } } }).on( 'before-autosave.update-post-slug', function() { titleHasFocus = document.activeElement && document.activeElement.id === 'title'; }).on( 'after-autosave.update-post-slug', function() { /* * Create slug area only if not already there * and the title field was not focused (user was not typing a title) when autosave ran. */ if ( ! $('#edit-slug-box > *').length && ! titleHasFocus ) { $.post( ajaxurl, { action: 'sample-permalink', post_id: $('#post_ID').val(), new_title: $('#title').val(), samplepermalinknonce: $('#samplepermalinknonce').val() }, function( data ) { if ( data != '-1' ) { $('#edit-slug-box').html(data); } } ); } }); }(jQuery)); /** * Heartbeat refresh nonces. */ (function($) { var check, timeout; /** * Only allow to check for nonce refresh every 30 seconds. */ function schedule() { check = false; window.clearTimeout( timeout ); timeout = window.setTimeout( function(){ check = true; }, 300000 ); } $( function() { schedule(); }).on( 'heartbeat-send.wp-refresh-nonces', function( e, data ) { var post_id, $authCheck = $('#wp-auth-check-wrap'); if ( check || ( $authCheck.length && ! $authCheck.hasClass( 'hidden' ) ) ) { if ( ( post_id = $('#post_ID').val() ) && $('#_wpnonce').val() ) { data['wp-refresh-post-nonces'] = { post_id: post_id }; } } }).on( 'heartbeat-tick.wp-refresh-nonces', function( e, data ) { var nonces = data['wp-refresh-post-nonces']; if ( nonces ) { schedule(); if ( nonces.replace ) { $.each( nonces.replace, function( selector, value ) { $( '#' + selector ).val( value ); }); } if ( nonces.heartbeatNonce ) window.heartbeatSettings.nonce = nonces.heartbeatNonce; } }); }(jQuery)); /** * All post and postbox controls and functionality. */ jQuery( function($) { var stamp, visibility, $submitButtons, updateVisibility, updateText, $textarea = $('#content'), $document = $(document), postId = $('#post_ID').val() || 0, $submitpost = $('#submitpost'), releaseLock = true, $postVisibilitySelect = $('#post-visibility-select'), $timestampdiv = $('#timestampdiv'), $postStatusSelect = $('#post-status-select'), isMac = window.navigator.platform ? window.navigator.platform.indexOf( 'Mac' ) !== -1 : false, copyAttachmentURLClipboard = new ClipboardJS( '.copy-attachment-url.edit-media' ), copyAttachmentURLSuccessTimeout, __ = wp.i18n.__, _x = wp.i18n._x; postboxes.add_postbox_toggles(pagenow); /* * Clear the window name. Otherwise if this is a former preview window where the user navigated to edit another post, * and the first post is still being edited, clicking Preview there will use this window to show the preview. */ window.name = ''; // Post locks: contain focus inside the dialog. If the dialog is shown, focus the first item. $('#post-lock-dialog .notification-dialog').on( 'keydown', function(e) { // Don't do anything when [Tab] is pressed. if ( e.which != 9 ) return; var target = $(e.target); // [Shift] + [Tab] on first tab cycles back to last tab. if ( target.hasClass('wp-tab-first') && e.shiftKey ) { $(this).find('.wp-tab-last').trigger( 'focus' ); e.preventDefault(); // [Tab] on last tab cycles back to first tab. } else if ( target.hasClass('wp-tab-last') && ! e.shiftKey ) { $(this).find('.wp-tab-first').trigger( 'focus' ); e.preventDefault(); } }).filter(':visible').find('.wp-tab-first').trigger( 'focus' ); // Set the heartbeat interval to 10 seconds if post lock dialogs are enabled. if ( wp.heartbeat && $('#post-lock-dialog').length ) { wp.heartbeat.interval( 10 ); } // The form is being submitted by the user. $submitButtons = $submitpost.find( ':submit, a.submitdelete, #post-preview' ).on( 'click.edit-post', function( event ) { var $button = $(this); if ( $button.hasClass('disabled') ) { event.preventDefault(); return; } if ( $button.hasClass('submitdelete') || $button.is( '#post-preview' ) ) { return; } // The form submission can be blocked from JS or by using HTML 5.0 validation on some fields. // Run this only on an actual 'submit'. $('form#post').off( 'submit.edit-post' ).on( 'submit.edit-post', function( event ) { if ( event.isDefaultPrevented() ) { return; } // Stop auto save. if ( wp.autosave ) { wp.autosave.server.suspend(); } if ( typeof commentReply !== 'undefined' ) { /* * Warn the user they have an unsaved comment before submitting * the post data for update. */ if ( ! commentReply.discardCommentChanges() ) { return false; } /* * Close the comment edit/reply form if open to stop the form * action from interfering with the post's form action. */ commentReply.close(); } releaseLock = false; $(window).off( 'beforeunload.edit-post' ); $submitButtons.addClass( 'disabled' ); if ( $button.attr('id') === 'publish' ) { $submitpost.find( '#major-publishing-actions .spinner' ).addClass( 'is-active' ); } else { $submitpost.find( '#minor-publishing .spinner' ).addClass( 'is-active' ); } }); }); // Submit the form saving a draft or an autosave, and show a preview in a new tab. $('#post-preview').on( 'click.post-preview', function( event ) { var $this = $(this), $form = $('form#post'), $previewField = $('input#wp-preview'), target = $this.attr('target') || 'wp-preview', ua = navigator.userAgent.toLowerCase(); event.preventDefault(); if ( $this.hasClass('disabled') ) { return; } if ( wp.autosave ) { wp.autosave.server.tempBlockSave(); } $previewField.val('dopreview'); $form.attr( 'target', target ).trigger( 'submit' ).attr( 'target', '' ); // Workaround for WebKit bug preventing a form submitting twice to the same action. // https://bugs.webkit.org/show_bug.cgi?id=28633 if ( ua.indexOf('safari') !== -1 && ua.indexOf('chrome') === -1 ) { $form.attr( 'action', function( index, value ) { return value + '?t=' + ( new Date() ).getTime(); }); } $previewField.val(''); }); // Auto save new posts after a title is typed. if ( $( '#auto_draft' ).val() ) { $( '#title' ).on( 'blur', function() { var cancel; if ( ! this.value || $('#edit-slug-box > *').length ) { return; } // Cancel the auto save when the blur was triggered by the user submitting the form. $('form#post').one( 'submit', function() { cancel = true; }); window.setTimeout( function() { if ( ! cancel && wp.autosave ) { wp.autosave.server.triggerSave(); } }, 200 ); }); } $document.on( 'autosave-disable-buttons.edit-post', function() { $submitButtons.addClass( 'disabled' ); }).on( 'autosave-enable-buttons.edit-post', function() { if ( ! wp.heartbeat || ! wp.heartbeat.hasConnectionError() ) { $submitButtons.removeClass( 'disabled' ); } }).on( 'before-autosave.edit-post', function() { $( '.autosave-message' ).text( __( 'Saving Draft…' ) ); }).on( 'after-autosave.edit-post', function( event, data ) { $( '.autosave-message' ).text( data.message ); if ( $( document.body ).hasClass( 'post-new-php' ) ) { $( '.submitbox .submitdelete' ).show(); } }); /* * When the user is trying to load another page, or reloads current page * show a confirmation dialog when there are unsaved changes. */ $( window ).on( 'beforeunload.edit-post', function( event ) { var editor = window.tinymce && window.tinymce.get( 'content' ); var changed = false; if ( wp.autosave ) { changed = wp.autosave.server.postChanged(); } else if ( editor ) { changed = ( ! editor.isHidden() && editor.isDirty() ); } if ( changed ) { event.preventDefault(); // The return string is needed for browser compat. // See https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event. return __( 'The changes you made will be lost if you navigate away from this page.' ); } }).on( 'pagehide.edit-post', function( event ) { if ( ! releaseLock ) { return; } /* * Unload is triggered (by hand) on removing the Thickbox iframe. * Make sure we process only the main document unload. */ if ( event.target && event.target.nodeName != '#document' ) { return; } var postID = $('#post_ID').val(); var postLock = $('#active_post_lock').val(); if ( ! postID || ! postLock ) { return; } var data = { action: 'wp-remove-post-lock', _wpnonce: $('#_wpnonce').val(), post_ID: postID, active_post_lock: postLock }; if ( window.FormData && window.navigator.sendBeacon ) { var formData = new window.FormData(); $.each( data, function( key, value ) { formData.append( key, value ); }); if ( window.navigator.sendBeacon( ajaxurl, formData ) ) { return; } } // Fall back to a synchronous POST request. // See https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon $.post({ async: false, data: data, url: ajaxurl }); }); // Multiple taxonomies. if ( $('#tagsdiv-post_tag').length ) { window.tagBox && window.tagBox.init(); } else { $('.meta-box-sortables').children('div.postbox').each(function(){ if ( this.id.indexOf('tagsdiv-') === 0 ) { window.tagBox && window.tagBox.init(); return false; } }); } // Handle categories. $('.categorydiv').each( function(){ var this_id = $(this).attr('id'), catAddBefore, catAddAfter, taxonomyParts, taxonomy, settingName; taxonomyParts = this_id.split('-'); taxonomyParts.shift(); taxonomy = taxonomyParts.join('-'); settingName = taxonomy + '_tab'; if ( taxonomy == 'category' ) { settingName = 'cats'; } // @todo Move to jQuery 1.3+, support for multiple hierarchical taxonomies, see wp-lists.js. $('a', '#' + taxonomy + '-tabs').on( 'click', function( e ) { e.preventDefault(); var t = $(this).attr('href'); $(this).parent().addClass('tabs').siblings('li').removeClass('tabs'); $('#' + taxonomy + '-tabs').siblings('.tabs-panel').hide(); $(t).show(); if ( '#' + taxonomy + '-all' == t ) { deleteUserSetting( settingName ); } else { setUserSetting( settingName, 'pop' ); } }); if ( getUserSetting( settingName ) ) $('a[href="#' + taxonomy + '-pop"]', '#' + taxonomy + '-tabs').trigger( 'click' ); // Add category button controls. $('#new' + taxonomy).one( 'focus', function() { $( this ).val( '' ).removeClass( 'form-input-tip' ); }); // On [Enter] submit the taxonomy. $('#new' + taxonomy).on( 'keypress', function(event){ if( 13 === event.keyCode ) { event.preventDefault(); $('#' + taxonomy + '-add-submit').trigger( 'click' ); } }); // After submitting a new taxonomy, re-focus the input field. $('#' + taxonomy + '-add-submit').on( 'click', function() { $('#new' + taxonomy).trigger( 'focus' ); }); /** * Before adding a new taxonomy, disable submit button. * * @param {Object} s Taxonomy object which will be added. * * @return {Object} */ catAddBefore = function( s ) { if ( !$('#new'+taxonomy).val() ) { return false; } s.data += '&' + $( ':checked', '#'+taxonomy+'checklist' ).serialize(); $( '#' + taxonomy + '-add-submit' ).prop( 'disabled', true ); return s; }; /** * Re-enable submit button after a taxonomy has been added. * * Re-enable submit button. * If the taxonomy has a parent place the taxonomy underneath the parent. * * @param {Object} r Response. * @param {Object} s Taxonomy data. * * @return {void} */ catAddAfter = function( r, s ) { var sup, drop = $('#new'+taxonomy+'_parent'); $( '#' + taxonomy + '-add-submit' ).prop( 'disabled', false ); if ( 'undefined' != s.parsed.responses[0] && (sup = s.parsed.responses[0].supplemental.newcat_parent) ) { drop.before(sup); drop.remove(); } }; $('#' + taxonomy + 'checklist').wpList({ alt: '', response: taxonomy + '-ajax-response', addBefore: catAddBefore, addAfter: catAddAfter }); // Add new taxonomy button toggles input form visibility. $('#' + taxonomy + '-add-toggle').on( 'click', function( e ) { e.preventDefault(); $('#' + taxonomy + '-adder').toggleClass( 'wp-hidden-children' ); $('a[href="#' + taxonomy + '-all"]', '#' + taxonomy + '-tabs').trigger( 'click' ); $('#new'+taxonomy).trigger( 'focus' ); }); // Sync checked items between "All {taxonomy}" and "Most used" lists. $('#' + taxonomy + 'checklist, #' + taxonomy + 'checklist-pop').on( 'click', 'li.popular-category > label input[type="checkbox"]', function() { var t = $(this), c = t.is(':checked'), id = t.val(); if ( id && t.parents('#taxonomy-'+taxonomy).length ) { // Fixed for ticket #62504. See https://core.trac.wordpress.org/ticket/62504. $('input#in-' + taxonomy + '-' + id + ', input[id^="in-' + taxonomy + '-' + id + '-"]').prop('checked', c); $('input#in-popular-' + taxonomy + '-' + id).prop('checked', c); } } ); }); // End cats. // Custom Fields postbox. if ( $('#postcustom').length ) { $( '#the-list' ).wpList( { /** * Add current post_ID to request to fetch custom fields * * @ignore * * @param {Object} s Request object. * * @return {Object} Data modified with post_ID attached. */ addBefore: function( s ) { s.data += '&post_id=' + $('#post_ID').val(); return s; }, /** * Show the listing of custom fields after fetching. * * @ignore */ addAfter: function() { $('table#list-table').show(); } }); } /* * Publish Post box (#submitdiv) */ if ( $('#submitdiv').length ) { stamp = $('#timestamp').html(); visibility = $('#post-visibility-display').html(); /** * When the visibility of a post changes sub-options should be shown or hidden. * * @ignore * * @return {void} */ updateVisibility = function() { // Show sticky for public posts. if ( $postVisibilitySelect.find('input:radio:checked').val() != 'public' ) { $('#sticky').prop('checked', false); $('#sticky-span').hide(); } else { $('#sticky-span').show(); } // Show password input field for password protected post. if ( $postVisibilitySelect.find('input:radio:checked').val() != 'password' ) { $('#password-span').hide(); } else { $('#password-span').show(); } }; /** * Make sure all labels represent the current settings. * * @ignore * * @return {boolean} False when an invalid timestamp has been selected, otherwise True. */ updateText = function() { if ( ! $timestampdiv.length ) return true; var attemptedDate, originalDate, currentDate, publishOn, postStatus = $('#post_status'), optPublish = $('option[value="publish"]', postStatus), aa = $('#aa').val(), mm = $('#mm').val(), jj = $('#jj').val(), hh = $('#hh').val(), mn = $('#mn').val(); attemptedDate = new Date( aa, mm - 1, jj, hh, mn ); originalDate = new Date( $('#hidden_aa').val(), $('#hidden_mm').val() -1, $('#hidden_jj').val(), $('#hidden_hh').val(), $('#hidden_mn').val() ); currentDate = new Date( $('#cur_aa').val(), $('#cur_mm').val() -1, $('#cur_jj').val(), $('#cur_hh').val(), $('#cur_mn').val() ); // Catch unexpected date problems. if ( attemptedDate.getFullYear() != aa || (1 + attemptedDate.getMonth()) != mm || attemptedDate.getDate() != jj || attemptedDate.getMinutes() != mn ) { $timestampdiv.find('.timestamp-wrap').addClass('form-invalid'); return false; } else { $timestampdiv.find('.timestamp-wrap').removeClass('form-invalid'); } // Determine what the publish should be depending on the date and post status. if ( attemptedDate > currentDate ) { publishOn = __( 'Schedule for:' ); $('#publish').val( _x( 'Schedule', 'post action/button label' ) ); } else if ( attemptedDate <= currentDate && $('#original_post_status').val() != 'publish' ) { publishOn = __( 'Publish on:' ); $('#publish').val( __( 'Publish' ) ); } else { publishOn = __( 'Published on:' ); $('#publish').val( __( 'Update' ) ); } // If the date is the same, set it to trigger update events. if ( originalDate.toUTCString() == attemptedDate.toUTCString() ) { // Re-set to the current value. $('#timestamp').html(stamp); } else { $('#timestamp').html( '\n' + publishOn + ' ' + // translators: 1: Month, 2: Day, 3: Year, 4: Hour, 5: Minute. __( '%1$s %2$s, %3$s at %4$s:%5$s' ) .replace( '%1$s', $( 'option[value="' + mm + '"]', '#mm' ).attr( 'data-text' ) ) .replace( '%2$s', parseInt( jj, 10 ) ) .replace( '%3$s', aa ) .replace( '%4$s', ( '00' + hh ).slice( -2 ) ) .replace( '%5$s', ( '00' + mn ).slice( -2 ) ) + ' ' ); } // Add "privately published" to post status when applies. if ( $postVisibilitySelect.find('input:radio:checked').val() == 'private' ) { $('#publish').val( __( 'Update' ) ); if ( 0 === optPublish.length ) { postStatus.append(''); } else { optPublish.html( __( 'Privately Published' ) ); } $('option[value="publish"]', postStatus).prop('selected', true); $('#misc-publishing-actions .edit-post-status').hide(); } else { if ( $('#original_post_status').val() == 'future' || $('#original_post_status').val() == 'draft' ) { if ( optPublish.length ) { optPublish.remove(); postStatus.val($('#hidden_post_status').val()); } } else { optPublish.html( __( 'Published' ) ); } if ( postStatus.is(':hidden') ) $('#misc-publishing-actions .edit-post-status').show(); } // Update "Status:" to currently selected status. $('#post-status-display').text( // Remove any potential tags from post status text. wp.sanitize.stripTagsAndEncodeText( $('option:selected', postStatus).text() ) ); // Show or hide the "Save Draft" button. if ( $('option:selected', postStatus).val() == 'private' || $('option:selected', postStatus).val() == 'publish' ) { $('#save-post').hide(); } else { $('#save-post').show(); if ( $('option:selected', postStatus).val() == 'pending' ) { $('#save-post').show().val( __( 'Save as Pending' ) ); } else { $('#save-post').show().val( __( 'Save Draft' ) ); } } return true; }; // Show the visibility options and hide the toggle button when opened. $( '#visibility .edit-visibility').on( 'click', function( e ) { e.preventDefault(); if ( $postVisibilitySelect.is(':hidden') ) { updateVisibility(); $postVisibilitySelect.slideDown( 'fast', function() { $postVisibilitySelect.find( 'input[type="radio"]' ).first().trigger( 'focus' ); } ); $(this).hide(); } }); // Cancel visibility selection area and hide it from view. $postVisibilitySelect.find('.cancel-post-visibility').on( 'click', function( event ) { $postVisibilitySelect.slideUp('fast'); $('#visibility-radio-' + $('#hidden-post-visibility').val()).prop('checked', true); $('#post_password').val($('#hidden-post-password').val()); $('#sticky').prop('checked', $('#hidden-post-sticky').prop('checked')); $('#post-visibility-display').html(visibility); $('#visibility .edit-visibility').show().trigger( 'focus' ); updateText(); event.preventDefault(); }); // Set the selected visibility as current. $postVisibilitySelect.find('.save-post-visibility').on( 'click', function( event ) { // Crazyhorse branch - multiple OK cancels. var visibilityLabel = '', selectedVisibility = $postVisibilitySelect.find('input:radio:checked').val(); $postVisibilitySelect.slideUp('fast'); $('#visibility .edit-visibility').show().trigger( 'focus' ); updateText(); if ( 'public' !== selectedVisibility ) { $('#sticky').prop('checked', false); } switch ( selectedVisibility ) { case 'public': visibilityLabel = $( '#sticky' ).prop( 'checked' ) ? __( 'Public, Sticky' ) : __( 'Public' ); break; case 'private': visibilityLabel = __( 'Private' ); break; case 'password': visibilityLabel = __( 'Password Protected' ); break; } $('#post-visibility-display').text( visibilityLabel ); event.preventDefault(); }); // When the selection changes, update labels. $postVisibilitySelect.find('input:radio').on( 'change', function() { updateVisibility(); }); // Edit publish time click. $timestampdiv.siblings('a.edit-timestamp').on( 'click', function( event ) { if ( $timestampdiv.is( ':hidden' ) ) { $timestampdiv.slideDown( 'fast', function() { $( 'input, select', $timestampdiv.find( '.timestamp-wrap' ) ).first().trigger( 'focus' ); } ); $(this).hide(); } event.preventDefault(); }); // Cancel editing the publish time and hide the settings. $timestampdiv.find('.cancel-timestamp').on( 'click', function( event ) { $timestampdiv.slideUp('fast').siblings('a.edit-timestamp').show().trigger( 'focus' ); $('#mm').val($('#hidden_mm').val()); $('#jj').val($('#hidden_jj').val()); $('#aa').val($('#hidden_aa').val()); $('#hh').val($('#hidden_hh').val()); $('#mn').val($('#hidden_mn').val()); updateText(); event.preventDefault(); }); // Save the changed timestamp. $timestampdiv.find('.save-timestamp').on( 'click', function( event ) { // Crazyhorse branch - multiple OK cancels. if ( updateText() ) { $timestampdiv.slideUp('fast'); $timestampdiv.siblings('a.edit-timestamp').show().trigger( 'focus' ); } event.preventDefault(); }); // Cancel submit when an invalid timestamp has been selected. $('#post').on( 'submit', function( event ) { if ( ! updateText() ) { event.preventDefault(); $timestampdiv.show(); if ( wp.autosave ) { wp.autosave.enableButtons(); } $( '#publishing-action .spinner' ).removeClass( 'is-active' ); } }); // Post Status edit click. $postStatusSelect.siblings('a.edit-post-status').on( 'click', function( event ) { if ( $postStatusSelect.is( ':hidden' ) ) { $postStatusSelect.slideDown( 'fast', function() { $postStatusSelect.find('select').trigger( 'focus' ); } ); $(this).hide(); } event.preventDefault(); }); // Save the Post Status changes and hide the options. $postStatusSelect.find('.save-post-status').on( 'click', function( event ) { $postStatusSelect.slideUp( 'fast' ).siblings( 'a.edit-post-status' ).show().trigger( 'focus' ); updateText(); event.preventDefault(); }); // Cancel Post Status editing and hide the options. $postStatusSelect.find('.cancel-post-status').on( 'click', function( event ) { $postStatusSelect.slideUp( 'fast' ).siblings( 'a.edit-post-status' ).show().trigger( 'focus' ); $('#post_status').val( $('#hidden_post_status').val() ); updateText(); event.preventDefault(); }); } /** * Handle the editing of the post_name. Create the required HTML elements and * update the changes via Ajax. * * @global * * @return {void} */ function editPermalink() { var i, slug_value, slug_label, $el, revert_e, c = 0, real_slug = $('#post_name'), revert_slug = real_slug.val(), permalink = $( '#sample-permalink' ), permalinkOrig = permalink.html(), permalinkInner = $( '#sample-permalink a' ).html(), buttons = $('#edit-slug-buttons'), buttonsOrig = buttons.html(), full = $('#editable-post-name-full'); // Deal with Twemoji in the post-name. full.find( 'img' ).replaceWith( function() { return this.alt; } ); full = full.html(); permalink.html( permalinkInner ); // Save current content to revert to when cancelling. $el = $( '#editable-post-name' ); revert_e = $el.html(); buttons.html( ' ' + '' ); // Save permalink changes. buttons.children( '.save' ).on( 'click', function() { var new_slug = $el.children( 'input' ).val(); if ( new_slug == $('#editable-post-name-full').text() ) { buttons.children('.cancel').trigger( 'click' ); return; } $.post( ajaxurl, { action: 'sample-permalink', post_id: postId, new_slug: new_slug, new_title: $('#title').val(), samplepermalinknonce: $('#samplepermalinknonce').val() }, function(data) { var box = $('#edit-slug-box'); box.html(data); if (box.hasClass('hidden')) { box.fadeIn('fast', function () { box.removeClass('hidden'); }); } buttons.html(buttonsOrig); permalink.html(permalinkOrig); real_slug.val(new_slug); $( '.edit-slug' ).trigger( 'focus' ); wp.a11y.speak( __( 'Permalink saved' ) ); } ); }); // Cancel editing of permalink. buttons.children( '.cancel' ).on( 'click', function() { $('#view-post-btn').show(); $el.html(revert_e); buttons.html(buttonsOrig); permalink.html(permalinkOrig); real_slug.val(revert_slug); $( '.edit-slug' ).trigger( 'focus' ); }); // If more than 1/4th of 'full' is '%', make it empty. for ( i = 0; i < full.length; ++i ) { if ( '%' == full.charAt(i) ) c++; } slug_value = ( c > full.length / 4 ) ? '' : full; slug_label = __( 'URL Slug' ); $el.html( '' + '' ).children( 'input' ).on( 'keydown', function( e ) { var key = e.which; // On [Enter], just save the new slug, don't save the post. if ( 13 === key ) { e.preventDefault(); buttons.children( '.save' ).trigger( 'click' ); } // On [Esc] cancel the editing. if ( 27 === key ) { buttons.children( '.cancel' ).trigger( 'click' ); } } ).on( 'keyup', function() { real_slug.val( this.value ); }).trigger( 'focus' ); } $( '#titlediv' ).on( 'click', '.edit-slug', function() { editPermalink(); }); /** * Adds screen reader text to the title label when needed. * * Use the 'screen-reader-text' class to emulate a placeholder attribute * and hide the label when entering a value. * * @param {string} id Optional. HTML ID to add the screen reader helper text to. * * @global * * @return {void} */ window.wptitlehint = function( id ) { id = id || 'title'; var title = $( '#' + id ), titleprompt = $( '#' + id + '-prompt-text' ); if ( '' === title.val() ) { titleprompt.removeClass( 'screen-reader-text' ); } title.on( 'input', function() { if ( '' === this.value ) { titleprompt.removeClass( 'screen-reader-text' ); return; } titleprompt.addClass( 'screen-reader-text' ); } ); }; wptitlehint(); // Resize the WYSIWYG and plain text editors. ( function() { var editor, offset, mce, $handle = $('#post-status-info'), $postdivrich = $('#postdivrich'); // If there are no textareas or we are on a touch device, we can't do anything. if ( ! $textarea.length || 'ontouchstart' in window ) { // Hide the resize handle. $('#content-resize-handle').hide(); return; } /** * Handle drag event. * * @param {Object} event Event containing details about the drag. */ function dragging( event ) { if ( $postdivrich.hasClass( 'wp-editor-expand' ) ) { return; } if ( mce ) { editor.theme.resizeTo( null, offset + event.pageY ); } else { $textarea.height( Math.max( 50, offset + event.pageY ) ); } event.preventDefault(); } /** * When the dragging stopped make sure we return focus and do a confidence check on the height. */ function endDrag() { var height, toolbarHeight; if ( $postdivrich.hasClass( 'wp-editor-expand' ) ) { return; } if ( mce ) { editor.focus(); toolbarHeight = parseInt( $( '#wp-content-editor-container .mce-toolbar-grp' ).height(), 10 ); if ( toolbarHeight < 10 || toolbarHeight > 200 ) { toolbarHeight = 30; } height = parseInt( $('#content_ifr').css('height'), 10 ) + toolbarHeight - 28; } else { $textarea.trigger( 'focus' ); height = parseInt( $textarea.css('height'), 10 ); } $document.off( '.wp-editor-resize' ); // Confidence check: normalize height to stay within acceptable ranges. if ( height && height > 50 && height < 5000 ) { setUserSetting( 'ed_size', height ); } } $handle.on( 'mousedown.wp-editor-resize', function( event ) { if ( typeof tinymce !== 'undefined' ) { editor = tinymce.get('content'); } if ( editor && ! editor.isHidden() ) { mce = true; offset = $('#content_ifr').height() - event.pageY; } else { mce = false; offset = $textarea.height() - event.pageY; $textarea.trigger( 'blur' ); } $document.on( 'mousemove.wp-editor-resize', dragging ) .on( 'mouseup.wp-editor-resize mouseleave.wp-editor-resize', endDrag ); event.preventDefault(); }).on( 'mouseup.wp-editor-resize', endDrag ); })(); // TinyMCE specific handling of Post Format changes to reflect in the editor. if ( typeof tinymce !== 'undefined' ) { // When changing post formats, change the editor body class. $( '#post-formats-select input.post-format' ).on( 'change.set-editor-class', function() { var editor, body, format = this.id; if ( format && $( this ).prop( 'checked' ) && ( editor = tinymce.get( 'content' ) ) ) { body = editor.getBody(); body.className = body.className.replace( /\bpost-format-[^ ]+/, '' ); editor.dom.addClass( body, format == 'post-format-0' ? 'post-format-standard' : format ); $( document ).trigger( 'editor-classchange' ); } }); // When changing page template, change the editor body class. $( '#page_template' ).on( 'change.set-editor-class', function() { var editor, body, pageTemplate = $( this ).val() || ''; pageTemplate = pageTemplate.substr( pageTemplate.lastIndexOf( '/' ) + 1, pageTemplate.length ) .replace( /\.php$/, '' ) .replace( /\./g, '-' ); if ( pageTemplate && ( editor = tinymce.get( 'content' ) ) ) { body = editor.getBody(); body.className = body.className.replace( /\bpage-template-[^ ]+/, '' ); editor.dom.addClass( body, 'page-template-' + pageTemplate ); $( document ).trigger( 'editor-classchange' ); } }); } // Save on pressing [Ctrl]/[Command] + [S] in the Text editor. $textarea.on( 'keydown.wp-autosave', function( event ) { // Key [S] has code 83. if ( event.which === 83 ) { if ( event.shiftKey || event.altKey || ( isMac && ( ! event.metaKey || event.ctrlKey ) ) || ( ! isMac && ! event.ctrlKey ) ) { return; } wp.autosave && wp.autosave.server.triggerSave(); event.preventDefault(); } }); // If the last status was auto-draft and the save is triggered, edit the current URL. if ( $( '#original_post_status' ).val() === 'auto-draft' && window.history.replaceState ) { var location; $( '#publish' ).on( 'click', function() { location = window.location.href; location += ( location.indexOf( '?' ) !== -1 ) ? '&' : '?'; location += 'wp-post-new-reload=true'; window.history.replaceState( null, null, location ); }); } /** * Copies the attachment URL in the Edit Media page to the clipboard. * * @since 5.5.0 * * @param {MouseEvent} event A click event. * * @return {void} */ copyAttachmentURLClipboard.on( 'success', function( event ) { var triggerElement = $( event.trigger ), successElement = $( '.success', triggerElement.closest( '.copy-to-clipboard-container' ) ); // Clear the selection and move focus back to the trigger. event.clearSelection(); // Show success visual feedback. clearTimeout( copyAttachmentURLSuccessTimeout ); successElement.removeClass( 'hidden' ); // Hide success visual feedback after 3 seconds since last success. copyAttachmentURLSuccessTimeout = setTimeout( function() { successElement.addClass( 'hidden' ); }, 3000 ); // Handle success audible feedback. wp.a11y.speak( __( 'The file URL has been copied to your clipboard' ) ); } ); } ); /** * TinyMCE word count display */ ( function( $, counter ) { $( function() { var $content = $( '#content' ), $count = $( '#wp-word-count' ).find( '.word-count' ), prevCount = 0, contentEditor; /** * Get the word count from TinyMCE and display it */ function update() { var text, count; if ( ! contentEditor || contentEditor.isHidden() ) { text = $content.val(); } else { text = contentEditor.getContent( { format: 'raw' } ); } count = counter.count( text ); if ( count !== prevCount ) { $count.text( count ); } prevCount = count; } /** * Bind the word count update triggers. * * When a node change in the main TinyMCE editor has been triggered. * When a key has been released in the plain text content editor. */ $( document ).on( 'tinymce-editor-init', function( event, editor ) { if ( editor.id !== 'content' ) { return; } contentEditor = editor; editor.on( 'nodechange keyup', _.debounce( update, 1000 ) ); } ); $content.on( 'input keyup', _.debounce( update, 1000 ) ); update(); } ); } )( jQuery, new wp.utils.WordCounter() );

How Mathematics Secures Digital Privacy Today

1. Introduction to Digital Privacy and the Role of Mathematics

In our increasingly digital world, safeguarding personal information has become a critical challenge. From online banking to social media, data breaches and cyber threats threaten individual privacy and national security alike. These challenges necessitate robust security measures grounded in rigorous principles.

Mathematics plays a pivotal role in developing encryption algorithms and security protocols that protect data from unauthorized access. Without mathematical foundations, modern digital privacy systems would lack the strength and reliability needed to withstand sophisticated attacks.

In essence, the complex interplay of mathematical concepts underpins the encryption mechanisms we rely on daily, ensuring our private communications and transactions remain confidential.

Contents

2. Fundamental Mathematical Concepts in Digital Security

At the core of digital security lie several key mathematical principles. These concepts transform abstract numbers into powerful tools that can encode, authenticate, and secure information against malicious actors.

a. Number theory and modular arithmetic in cryptography

Number theory studies properties of integers and their relationships. Modular arithmetic, a system where numbers «wrap around» after reaching a certain value (the modulus), forms the backbone of many cryptographic algorithms. For example, encrypting messages often involves computations like a ≡ b (mod n), which ensures that operations stay within a fixed range, making cryptanalysis more difficult.

b. The role of prime numbers and their properties in encryption algorithms

Prime numbers—integers divisible only by 1 and themselves—are essential for creating secure keys. Their unpredictability and mathematical properties underpin algorithms like RSA, where the difficulty of factoring large composite numbers made from primes guarantees security. For example, the difficulty of decomposing a product of two large primes ensures that only someone with the private key can decrypt the message.

c. How mathematical complexity translates into security strength

As the complexity of the mathematical problem increases—such as factoring very large numbers or solving discrete logarithms—the difficulty for attackers becomes prohibitively high. This computational hardness underpins the security of encryption methods, making brute-force attacks impractical for sufficiently large keys.

3. Historical Foundations: Electromagnetism and Its Influence on Modern Communications

While mathematics today often appears abstract, its roots often extend into physics. Electromagnetic theory, developed through Maxwell’s equations, revolutionized communication technology and indirectly contributed to secure data transmission.

a. Maxwell’s equations and the development of electromagnetic theory

James Clerk Maxwell formulated equations describing electric and magnetic fields, laying the groundwork for wireless communication. These equations predicted electromagnetic waves, enabling the development of radio, television, and later, Wi-Fi and mobile networks.

b. The connection between electromagnetic principles and secure wireless communication

Understanding electromagnetic propagation allows engineers to design secure wireless channels. Techniques such as frequency hopping and spread spectrum—rooted in electromagnetic principles—help mitigate eavesdropping and jamming, safeguarding the integrity of wireless data.

c. Implications of electromagnetic theory for data transmission security

Electromagnetic properties influence encryption and modulation strategies. For instance, the physical layer security in wireless networks often employs randomness derived from electromagnetic signals to generate cryptographic keys, enhancing protection against interception.

4. Cryptography: The Mathematics of Protecting Data

Cryptography employs complex mathematical algorithms to convert readable data into unintelligible formats, ensuring confidentiality and authenticity.

a. Symmetric vs. asymmetric encryption: mathematical differences and applications

Symmetric encryption uses a single shared key for both encryption and decryption. Algorithms like AES rely on substitution-permutation networks, which involve multiple rounds of mathematical transformations. Conversely, asymmetric encryption employs a key pair: a public key for encryption and a private key for decryption, based on mathematical problems like factoring large primes (RSA) or elliptic curve discrete logarithms (ECC).

b. Elliptic curve cryptography: a modern example of mathematics enhancing security

ECC leverages the algebraic structure of elliptic curves over finite fields. Its advantage lies in providing comparable security to RSA with significantly smaller keys, reducing computational load. For example, a 256-bit ECC key offers similar security to a 3072-bit RSA key, making ECC ideal for resource-constrained environments.

c. Comparing key sizes: 256-bit elliptic curve vs. 3072-bit RSA, and their security implications

Encryption Type Key Size Security Level
ECC (Elliptic Curve) 256-bit High (equivalent to 3072-bit RSA)
RSA 3072-bit High

5. Advanced Mathematical Tools in Privacy Preservation

Beyond basic cryptography, advanced mathematical techniques enable new levels of privacy and data security, especially in the era of big data and cloud computing.

a. Statistical concepts: variance and its role in data anonymization and privacy guarantees

Statistical measures like variance help assess the risk of re-identification in anonymized datasets. For example, high variance in data points indicates greater diversity, reducing the likelihood that individual identities can be inferred.

b. Zero-knowledge proofs and their mathematical foundations

Zero-knowledge proofs enable one party to prove knowledge of a secret without revealing it. Mathematically, they rely on complex algorithms rooted in problems like discrete logarithms and quadratic residuosity, ensuring privacy during verification processes—crucial for secure authentication systems.

c. Homomorphic encryption: enabling computations on encrypted data without exposure

Homomorphic encryption allows operations such as addition or multiplication directly on encrypted data. This enables cloud services to process sensitive information without decrypting it, preserving privacy while maintaining functionality.

6. Modern Examples of Mathematics Securing Digital Privacy

Practical applications of these mathematical principles are evident in today’s technology landscape. Consider the following examples:

a. Wild Million: a case study illustrating the application of mathematical cryptography in gaming security

In online gaming, protecting player data and preventing cheating requires robust cryptographic protocols. play responsibly demonstrates how secure encryption maintains fair play and data integrity, leveraging principles like key exchange and secure authentication rooted in advanced mathematics.

b. Blockchain technology and cryptographic algorithms ensuring transaction integrity

Blockchain employs cryptographic hash functions, digital signatures, and consensus algorithms, all grounded in mathematical principles, to guarantee that transactions are immutable and tamper-proof. These techniques exemplify how mathematics ensures trust in decentralized systems.

c. Quantum-resistant algorithms and the future of mathematical security measures

As quantum computing advances, traditional encryption may become vulnerable. Researchers are developing quantum-resistant algorithms based on lattice problems and error-correcting codes—mathematical structures believed to be secure against quantum attacks—paving the way for future-proof privacy solutions.

7. Non-Obvious Depth: The Interplay of Mathematics and Emerging Technologies

The evolution of security protocols often involves complex mathematical innovations that are not immediately apparent. For instance:

a. The significance of Maxwell’s equations in the evolution of wireless security protocols

Maxwell’s equations not only enabled wireless communication but also influenced physical-layer security methods. Techniques such as secret key generation from electromagnetic channel characteristics rely on understanding these equations, illustrating how classical physics informs modern cryptography.

b. The role of complex mathematical structures in developing post-quantum cryptography

Post-quantum cryptography leverages advanced structures like lattices, multivariate polynomials, and code-based systems. These areas of mathematics—once purely theoretical—are now central to designing algorithms resistant to quantum attacks.

c. Challenges and opportunities in integrating advanced mathematics into everyday privacy solutions

While promising, integrating such complex mathematics into practical applications poses challenges in computational efficiency and implementation. Nonetheless, ongoing research offers opportunities to enhance privacy without sacrificing usability or speed.

8. Conclusion: The Continued Necessity of Mathematical Innovation for Digital Privacy

Mathematics remains the cornerstone of digital security, evolving continuously to meet emerging threats. From fundamental number theory to cutting-edge quantum-resistant schemes, mathematical innovation ensures that privacy can adapt to a rapidly changing technological landscape.

Understanding these principles empowers us not only to appreciate the sophistication behind online security but also to recognize the importance of supporting ongoing research in this vital field.

«Mathematics is the invisible shield guarding our digital lives, constantly evolving to stay ahead of those who seek to breach it.»

9. References and Further Reading

  • Electromagnetic Theory: Maxwell’s Equations and the Foundations of Electromagnetism by John David Jackson
  • Cryptography: Introduction to Modern Cryptography by Jonathan Katz and Yehuda Lindell
  • Statistical Methods: Statistics for Data Science by Peter Bruce and Andrew Bruce
  • Quantum-Resistant Algorithms: Post-Quantum Cryptography edited by Daniel J. Bernstein et al.

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