/** * @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 Simple Games Encode Deep Decision Complexity

Beneath the surface of seemingly straightforward games lies a hidden architecture of recursive decision webs—where minimal rules spawn unpredictable outcomes, challenging both human intuition and algorithmic design. This article deepens the insight presented in the parent exploration, revealing how simple systems generate strategic depth through entropy, cascading effects, and cognitive patterns.

In strategic domains ranging from AI planning to real-time decision-making, the tension between apparent simplicity and underlying complexity shapes performance. Games like Chicken vs Zombies exemplify this paradox: their rules are easy to state, yet their outcomes emerge from intricate chains of choice, risk, and recursive feedback.

1. The Illusion of Simplicity: Rule-Based Systems and Recursive Decision Webs

At first glance, many strategic games appear governed by clear, linear rules—move forward, retreat, attack, or retreat. Yet beneath this clarity lies a network of recursive decision branches triggered by context, opponent behavior, and probabilistic uncertainty. Psychological research shows humans are drawn to systems with transparent rules because they reduce perceived cognitive load—but this very simplicity masks a growing entropy of choice as variables compound.

For example, in Chicken vs Zombies, a player’s decision to “swerve” or “keep going” triggers a cascade of responsive actions from the opponent. Each choice branches into multiple micro-decisions, forming a tree of potential outcomes far exceeding initial expectations. This hidden branching complexity mirrors algorithmic state spaces, where small inputs propagate through conditional logic to divergent results.

The parent article’s insight—that perceived simplicity hides emergent depth—finds its perfect expression in these turn-based systems: simple rules generate rich, non-linear dynamics best understood through entropy and branching analysis.

2. Decision Entropy in Seemingly Linear Games

Entropy—the measure of uncertainty in probabilistic systems—plays a crucial role even in games where choices appear linear. In Chicken vs Zombies, despite deterministic rules, entropy arises from incomplete information: players rarely know exactly when or how the other will react. This uncertainty drives adaptive behavior, forcing players to estimate probabilities and update beliefs dynamically.

Measuring decision entropy involves quantifying the distribution of possible outcomes under uncertainty. In low-variance environments—where stakes are clear but options limited—the entropy remains contained, yet the perceived risk grows as players experience the cascading weight of sequential choices. This aligns with algorithmic forecasting, where constrained inputs and partial observability generate unpredictable behavior despite simple logic.

These patterns highlight a core challenge: real-world problems, like games, rarely offer perfect information. Instead, they demand robustness against entropy, requiring strategies that account for probabilistic evolution rather than deterministic certainty.

3. Cascading Consequences: From Micro Choices to Macro Outcomes

One of the most striking features of complex games is the butterfly effect: a single early decision can ripple through repeated iterations, altering entire game trajectories. In turn-based systems, small errors or delayed responses amplify over time, transforming minor miscalculations into major setbacks.

  • In Chicken vs Zombies, a delayed swerving decision might trigger a chain: opponent swerves, then brakes, then accelerates—each action compounding risk.
  • In strategic simulations, a single flawed planning step can degrade long-term success probability by orders of magnitude.

This mirrors cascading failures in distributed algorithms, where a node’s transient error propagates across a network. The parent theme’s emphasis on recursive complexity finds direct resonance in how constrained inputs and timing dependencies drive systemic fragility.

4. Cognitive Overload in Pattern-Seeking Minds

Human cognition excels at pattern recognition, yet this strength becomes a liability in complex systems. Players instinctively seek order, constructing mental models to simplify chaos—but these heuristics often misfire when entropy and feedback loops distort expected outcomes.

Cognitive biases like the gambler’s fallacy or confirmation bias distort decision-making under uncertainty. In games, this leads to predictable errors: assuming past patterns guarantee future results, or ignoring counter-evidence in evolving threats.

The parent article’s core insight—that simplicity masks depth—urges us to distinguish signal from noise. Recognizing that apparent regularity often conceals hidden layers empowers better adaptation, whether in gameplay or algorithm design.

5. From Gameplay to Algorithmic Resilience: Lessons in Adaptive Thinking

The strategic depth observed in games offers profound lessons for building resilient algorithms. By analyzing failure modes in simple frameworks, developers learn to construct decision architectures that tolerate entropy, detect cascading risks, and resist cognitive bias.

  • Robust systems integrate probabilistic forecasting to manage uncertainty, just as players estimate opponent moves.
  • Modular design enables easier debugging of cascading errors, mirroring layered game decision trees.
  • Adaptive strategies, responsive to new information, emulate human pattern-seeking while correcting for bias.

Applied wisdom from Chicken vs Zombies shows that even constrained systems can achieve remarkable depth—provided they anticipate complexity within simplicity. This insight transforms how we approach algorithmic design: complexity arises not from chaos, but from carefully structured simplicity.

As the parent article reminds us, true complexity emerges not from randomness, but from constrained rules interacting dynamically. Mastery lies in mapping those rules, understanding their hidden branches, and building resilience against entropy’s subtle push.

Explore the full exploration of how modern problems mirror strategic games at the parent article—where chaos simplifies into clarity, and simple choices reveal profound strategic depth.

Concept Explanation
Recursive Decision Trees Decision nodes that branch based on player actions, generating exponential complexity from simple rules.
Entropy in Low-Variance Systems Predictable but psychologically charged environments where small miscalculations amplify over time.
Cascading Consequences Early choices ripple through iterations, altering macro outcomes via compounding small effects.
Pattern-Seeking Bias Human tendency to impose order on chaos, often leading to flawed predictions in uncertain systems.
Algorithmic Resilience Designing systems that anticipate cascading failures and adapt using probabilistic reasoning.

The journey from simple game rules to algorithmic complexity reveals a universal truth: profound depth arises not from chaos, but from constrained simplicity. Understanding this principle transforms both gameplay strategy and computational design.

Recognize the web beneath the surface, anticipate the ripple, and build resilience—where every choice counts.

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