/**
* editor_plugin_src.js
*
* Copyright 2009, Moxiecode Systems AB
* Released under LGPL License.
*
* License: http://tinymce.moxiecode.com/license
* Contributing: http://tinymce.moxiecode.com/contributing
*
* Adds auto-save capability to the TinyMCE text editor to rescue content
* inadvertently lost. This plugin was originally developed by Speednet
* and that project can be found here: http://code.google.com/p/tinyautosave/
*
* TECHNOLOGY DISCUSSION:
*
* The plugin attempts to use the most advanced features available in the current browser to save
* as much content as possible. There are a total of four different methods used to autosave the
* content. In order of preference, they are:
*
* 1. localStorage - A new feature of HTML 5, localStorage can store megabytes of data per domain
* on the client computer. Data stored in the localStorage area has no expiration date, so we must
* manage expiring the data ourselves. localStorage is fully supported by IE8, and it is supposed
* to be working in Firefox 3 and Safari 3.2, but in reality is is flaky in those browsers. As
* HTML 5 gets wider support, the AutoSave plugin will use it automatically. In Windows Vista/7,
* localStorage is stored in the following folder:
* C:\Users\[username]\AppData\Local\Microsoft\Internet Explorer\DOMStore\[tempFolder]
*
* 2. sessionStorage - A new feature of HTML 5, sessionStorage works similarly to localStorage,
* except it is designed to expire after a certain amount of time. Because the specification
* around expiration date/time is very loosely-described, it is preferrable to use locaStorage and
* manage the expiration ourselves. sessionStorage has similar storage characteristics to
* localStorage, although it seems to have better support by Firefox 3 at the moment. (That will
* certainly change as Firefox continues getting better at HTML 5 adoption.)
*
* 3. UserData - A very under-exploited feature of Microsoft Internet Explorer, UserData is a
* way to store up to 128K of data per "document", or up to 1MB of data per domain, on the client
* computer. The feature is available for IE 5+, which makes it available for every version of IE
* supported by TinyMCE. The content is persistent across browser restarts and expires on the
* date/time specified, just like a cookie. However, the data is not cleared when the user clears
* cookies on the browser, which makes it well-suited for rescuing autosaved content. UserData,
* like other Microsoft IE browser technologies, is implemented as a behavior attached to a
* specific DOM object, so in this case we attach the behavior to the same DOM element that the
* TinyMCE editor instance is attached to.
*/
(function(tinymce) {
// Setup constants to help the compressor to reduce script size
var PLUGIN_NAME = 'autosave',
RESTORE_DRAFT = 'restoredraft',
TRUE = true,
undefined,
unloadHandlerAdded,
Dispatcher = tinymce.util.Dispatcher;
/**
* This plugin adds auto-save capability to the TinyMCE text editor to rescue content
* inadvertently lost. By using localStorage.
*
* @class tinymce.plugins.AutoSave
*/
tinymce.create('tinymce.plugins.AutoSave', {
/**
* Initializes the plugin, this will be executed after the plugin has been created.
* This call is done before the editor instance has finished it's initialization so use the onInit event
* of the editor instance to intercept that event.
*
* @method init
* @param {tinymce.Editor} ed Editor instance that the plugin is initialized in.
* @param {string} url Absolute URL to where the plugin is located.
*/
init : function(ed, url) {
var self = this, settings = ed.settings;
self.editor = ed;
// Parses the specified time string into a milisecond number 10m, 10s etc.
function parseTime(time) {
var multipels = {
s : 1000,
m : 60000
};
time = /^(\d+)([ms]?)$/.exec('' + time);
return (time[2] ? multipels[time[2]] : 1) * parseInt(time);
};
// Default config
tinymce.each({
ask_before_unload : TRUE,
interval : '30s',
retention : '20m',
minlength : 50
}, function(value, key) {
key = PLUGIN_NAME + '_' + key;
if (settings[key] === undefined)
settings[key] = value;
});
// Parse times
settings.autosave_interval = parseTime(settings.autosave_interval);
settings.autosave_retention = parseTime(settings.autosave_retention);
// Register restore button
ed.addButton(RESTORE_DRAFT, {
title : PLUGIN_NAME + ".restore_content",
onclick : function() {
if (ed.getContent({draft: true}).replace(/\s| |<\/?p[^>]*>|<br[^>]*>/gi, "").length > 0) {
// Show confirm dialog if the editor isn't empty
ed.windowManager.confirm(
PLUGIN_NAME + ".warning_message",
function(ok) {
if (ok)
self.restoreDraft();
}
);
} else
self.restoreDraft();
}
});
// Enable/disable restoredraft button depending on if there is a draft stored or not
ed.onNodeChange.add(function() {
var controlManager = ed.controlManager;
if (controlManager.get(RESTORE_DRAFT))
controlManager.setDisabled(RESTORE_DRAFT, !self.hasDraft());
});
ed.onInit.add(function() {
// Check if the user added the restore button, then setup auto storage logic
if (ed.controlManager.get(RESTORE_DRAFT)) {
// Setup storage engine
self.setupStorage(ed);
// Auto save contents each interval time
setInterval(function() {
self.storeDraft();
ed.nodeChanged();
}, settings.autosave_interval);
}
});
/**
* This event gets fired when a draft is stored to local storage.
*
* @event onStoreDraft
* @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
* @param {Object} draft Draft object containing the HTML contents of the editor.
*/
self.onStoreDraft = new Dispatcher(self);
/**
* This event gets fired when a draft is restored from local storage.
*
* @event onStoreDraft
* @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
* @param {Object} draft Draft object containing the HTML contents of the editor.
*/
self.onRestoreDraft = new Dispatcher(self);
/**
* This event gets fired when a draft removed/expired.
*
* @event onRemoveDraft
* @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
* @param {Object} draft Draft object containing the HTML contents of the editor.
*/
self.onRemoveDraft = new Dispatcher(self);
// Add ask before unload dialog only add one unload handler
if (!unloadHandlerAdded) {
window.onbeforeunload = tinymce.plugins.AutoSave._beforeUnloadHandler;
unloadHandlerAdded = TRUE;
}
},
/**
* Returns information about the plugin as a name/value array.
* The current keys are longname, author, authorurl, infourl and version.
*
* @method getInfo
* @return {Object} Name/value array containing information about the plugin.
*/
getInfo : function() {
return {
longname : 'Auto save',
author : 'Moxiecode Systems AB',
authorurl : 'http://tinymce.moxiecode.com',
infourl : 'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/autosave',
version : tinymce.majorVersion + "." + tinymce.minorVersion
};
},
/**
* Returns an expiration date UTC string.
*
* @method getExpDate
* @return {String} Expiration date UTC string.
*/
getExpDate : function() {
return new Date(
new Date().getTime() + this.editor.settings.autosave_retention
).toUTCString();
},
/**
* This method will setup the storage engine. If the browser has support for it.
*
* @method setupStorage
*/
setupStorage : function(ed) {
var self = this, testKey = PLUGIN_NAME + '_test', testVal = "OK";
self.key = PLUGIN_NAME + ed.id;
// Loop though each storage engine type until we find one that works
tinymce.each([
function() {
// Try HTML5 Local Storage
if (localStorage) {
localStorage.setItem(testKey, testVal);
if (localStorage.getItem(testKey) === testVal) {
localStorage.removeItem(testKey);
return localStorage;
}
}
},
function() {
// Try HTML5 Session Storage
if (sessionStorage) {
sessionStorage.setItem(testKey, testVal);
if (sessionStorage.getItem(testKey) === testVal) {
sessionStorage.removeItem(testKey);
return sessionStorage;
}
}
},
function() {
// Try IE userData
if (tinymce.isIE) {
ed.getElement().style.behavior = "url('#default#userData')";
// Fake localStorage on old IE
return {
autoExpires : TRUE,
setItem : function(key, value) {
var userDataElement = ed.getElement();
userDataElement.setAttribute(key, value);
userDataElement.expires = self.getExpDate();
try {
userDataElement.save("TinyMCE");
} catch (e) {
// Ignore, saving might fail if "Userdata Persistence" is disabled in IE
}
},
getItem : function(key) {
var userDataElement = ed.getElement();
try {
userDataElement.load("TinyMCE");
return userDataElement.getAttribute(key);
} catch (e) {
// Ignore, loading might fail if "Userdata Persistence" is disabled in IE
return null;
}
},
removeItem : function(key) {
ed.getElement().removeAttribute(key);
}
};
}
},
], function(setup) {
// Try executing each function to find a suitable storage engine
try {
self.storage = setup();
if (self.storage)
return false;
} catch (e) {
// Ignore
}
});
},
/**
* This method will store the current contents in the the storage engine.
*
* @method storeDraft
*/
storeDraft : function() {
var self = this, storage = self.storage, editor = self.editor, expires, content;
// Is the contents dirty
if (storage) {
// If there is no existing key and the contents hasn't been changed since
// it's original value then there is no point in saving a draft
if (!storage.getItem(self.key) && !editor.isDirty())
return;
// Store contents if the contents if longer than the minlength of characters
content = editor.getContent({draft: true});
if (content.length > editor.settings.autosave_minlength) {
expires = self.getExpDate();
// Store expiration date if needed IE userData has auto expire built in
if (!self.storage.autoExpires)
self.storage.setItem(self.key + "_expires", expires);
self.storage.setItem(self.key, content);
self.onStoreDraft.dispatch(self, {
expires : expires,
content : content
});
}
}
},
/**
* This method will restore the contents from the storage engine back to the editor.
*
* @method restoreDraft
*/
restoreDraft : function() {
var self = this, storage = self.storage, content;
if (storage) {
content = storage.getItem(self.key);
if (content) {
self.editor.setContent(content);
self.onRestoreDraft.dispatch(self, {
content : content
});
}
}
},
/**
* This method will return true/false if there is a local storage draft available.
*
* @method hasDraft
* @return {boolean} true/false state if there is a local draft.
*/
hasDraft : function() {
var self = this, storage = self.storage, expDate, exists;
if (storage) {
// Does the item exist at all
exists = !!storage.getItem(self.key);
if (exists) {
// Storage needs autoexpire
if (!self.storage.autoExpires) {
expDate = new Date(storage.getItem(self.key + "_expires"));
// Contents hasn't expired
if (new Date().getTime() < expDate.getTime())
return TRUE;
// Remove it if it has
self.removeDraft();
} else
return TRUE;
}
}
return false;
},
/**
* Removes the currently stored draft.
*
* @method removeDraft
*/
removeDraft : function() {
var self = this, storage = self.storage, key = self.key, content;
if (storage) {
// Get current contents and remove the existing draft
content = storage.getItem(key);
storage.removeItem(key);
storage.removeItem(key + "_expires");
// Dispatch remove event if we had any contents
if (content) {
self.onRemoveDraft.dispatch(self, {
content : content
});
}
}
},
"static" : {
// Internal unload handler will be called before the page is unloaded
_beforeUnloadHandler : function(e) {
var msg;
tinymce.each(tinyMCE.editors, function(ed) {
// Store a draft for each editor instance
if (ed.plugins.autosave)
ed.plugins.autosave.storeDraft();
// Never ask in fullscreen mode
if (ed.getParam("fullscreen_is_enabled"))
return;
// Setup a return message if the editor is dirty
if (!msg && ed.isDirty() && ed.getParam("autosave_ask_before_unload"))
msg = ed.getLang("autosave.unload_msg");
});
return msg;
}
}
});
tinymce.PluginManager.add('autosave', tinymce.plugins.AutoSave);
})(tinymce);
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