+ // Autosave in localStorage
+ function autosaveLocal() {
+ var restorePostData, undoPostData, blog_id, post_id, hasStorage, intervalTimer,
+ lastCompareString,
+ isSuspended = false;
+
+ // Check if the browser supports sessionStorage and it's not disabled
+ function checkStorage() {
+ var test = Math.random().toString(),
+ result = false;
+
+ try {
+ window.sessionStorage.setItem( 'wp-test', test );
+ result = window.sessionStorage.getItem( 'wp-test' ) === test;
+ window.sessionStorage.removeItem( 'wp-test' );
+ } catch(e) {}
+
+ hasStorage = result;
+ return result;
+ }
+
+ /**
+ * Initialize the local storage
+ *
+ * @return mixed False if no sessionStorage in the browser or an Object containing all postData for this blog
+ */
+ function getStorage() {
+ var stored_obj = false;
+ // Separate local storage containers for each blog_id
+ if ( hasStorage && blog_id ) {
+ stored_obj = sessionStorage.getItem( 'wp-autosave-' + blog_id );
+
+ if ( stored_obj ) {
+ stored_obj = JSON.parse( stored_obj );
+ } else {
+ stored_obj = {};
+ }
+ }
+
+ return stored_obj;
+ }
+
+ /**
+ * Set the storage for this blog
+ *
+ * Confirms that the data was saved successfully.
+ *
+ * @return bool
+ */
+ function setStorage( stored_obj ) {
+ var key;
+
+ if ( hasStorage && blog_id ) {
+ key = 'wp-autosave-' + blog_id;
+ sessionStorage.setItem( key, JSON.stringify( stored_obj ) );
+ return sessionStorage.getItem( key ) !== null;
+ }
+
+ return false;
+ }
+
+ /**
+ * Get the saved post data for the current post
+ *
+ * @return mixed False if no storage or no data or the postData as an Object
+ */
+ function getSavedPostData() {
+ var stored = getStorage();
+
+ if ( ! stored || ! post_id ) {
+ return false;
+ }
+
+ return stored[ 'post_' + post_id ] || false;
+ }
+
+ /**
+ * Set (save or delete) post data in the storage.
+ *
+ * If stored_data evaluates to 'false' the storage key for the current post will be removed
+ *
+ * $param stored_data The post data to store or null/false/empty to delete the key
+ * @return bool
+ */
+ function setData( stored_data ) {
+ var stored = getStorage();
+
+ if ( ! stored || ! post_id ) {
+ return false;
+ }
+
+ if ( stored_data ) {
+ stored[ 'post_' + post_id ] = stored_data;
+ } else if ( stored.hasOwnProperty( 'post_' + post_id ) ) {
+ delete stored[ 'post_' + post_id ];
+ } else {
+ return false;
+ }
+
+ return setStorage( stored );
+ }
+
+ function suspend() {
+ isSuspended = true;
+ }
+
+ function resume() {
+ isSuspended = false;
+ }
+
+ /**
+ * Save post data for the current post
+ *
+ * Runs on a 15 sec. interval, saves when there are differences in the post title or content.
+ * When the optional data is provided, updates the last saved post data.
+ *
+ * $param data optional Object The post data for saving, minimum 'post_title' and 'content'
+ * @return bool
+ */
+ function save( data ) {
+ var postData, compareString,
+ result = false;
+
+ if ( isSuspended || ! hasStorage ) {
+ return false;
+ }
+
+ if ( data ) {
+ postData = getSavedPostData() || {};
+ $.extend( postData, data );
+ } else {
+ postData = getPostData('local');
+ }
+
+ compareString = getCompareString( postData );
+
+ if ( typeof lastCompareString === 'undefined' ) {
+ lastCompareString = initialCompareString;
+ }
+
+ // If the content, title and excerpt did not change since the last save, don't save again
+ if ( compareString === lastCompareString ) {
+ return false;
+ }
+
+ postData.save_time = ( new Date() ).getTime();
+ postData.status = $( '#post_status' ).val() || '';
+ result = setData( postData );
+
+ if ( result ) {
+ lastCompareString = compareString;
+ }
+
+ return result;
+ }
+
+ // Run on DOM ready
+ function run() {
+ post_id = $('#post_ID').val() || 0;
+
+ // Check if the local post data is different than the loaded post data.
+ if ( $( '#wp-content-wrap' ).hasClass( 'tmce-active' ) ) {
+ // If TinyMCE loads first, check the post 1.5 sec. after it is ready.
+ // By this time the content has been loaded in the editor and 'saved' to the textarea.
+ // This prevents false positives.
+ $document.on( 'tinymce-editor-init.autosave', function() {
+ window.setTimeout( function() {
+ checkPost();
+ }, 1500 );
+ });
+ } else {
+ checkPost();
+ }
+
+ // Save every 15 sec.
+ intervalTimer = window.setInterval( save, 15000 );
+
+ $( 'form#post' ).on( 'submit.autosave-local', function() {
+ var editor = typeof tinymce !== 'undefined' && tinymce.get('content'),
+ post_id = $('#post_ID').val() || 0;
+
+ if ( editor && ! editor.isHidden() ) {
+ // Last onSubmit event in the editor, needs to run after the content has been moved to the textarea.
+ editor.on( 'submit', function() {
+ save({
+ post_title: $( '#title' ).val() || '',
+ content: $( '#content' ).val() || '',
+ excerpt: $( '#excerpt' ).val() || ''
+ });
+ });
+ } else {
+ save({
+ post_title: $( '#title' ).val() || '',
+ content: $( '#content' ).val() || '',
+ excerpt: $( '#excerpt' ).val() || ''
+ });
+ }
+
+ wpCookies.set( 'wp-saving-post', post_id + '-check', 24 * 60 * 60 );
+ });
+ }
+
+ // Strip whitespace and compare two strings
+ function compare( str1, str2 ) {
+ function removeSpaces( string ) {
+ return string.toString().replace(/[\x20\t\r\n\f]+/g, '');
+ }
+
+ return ( removeSpaces( str1 || '' ) === removeSpaces( str2 || '' ) );
+ }