Develop Reference

Spotfire - javascript to trigger IronPython script to be executed on report load

I have the follwing javascript code that it triggers an IronPython script when I load the report.
The only issue I have is that for a reason I don't know it does it (it triggers the script) a couple of times.
Can some one help me? below is the script:
var n=0;
$(function () {
function executeScript() {
if (n==0){
n=n+1;
now = new Date();
if (now.getTime()-$('#hiddenBtn input').val()>10000){
$('#hiddenBtn input').val(now.getTime());
$('#hiddenBtn input').focus();
$('#hiddenBtn input').blur();
}
}
}
$(document).ready(function(){executeScript()});
strong text});
Please, let me know if you need more information.
Thanks in advance!!!

I have had similar issues with Javascript executing multiple times. Spotfire seems to instance the JS more than once, and it can cause some interesting behavior...
the best solution, in my opinion, only works if users are accessing the document via a link (as opposed to browsing the library). pass a configuration block to set a document property with a current timestamp, which would execute your IP script. this is the most solid implementation.
otherwise, you can try something like this:
// get a reference to a container on the page with an ID "hidden"
var $hidden = $("#hiddenBtn input");
// only continue if the container is empty
if !($hidden.text()) {
var now = Date.now();
$hidden.text(now)
.focus()
.blur();
|}
this is essentially the same as the code you posted, but instead of relying on the var n, you're counting on the input #hiddenBtn > input being empty. there is a caveat that you'll have to ensure this field is empty before you save the document
one addtional solution is using a Data Function to update the document property, like #user1247722 shows in his answer here: https://stackoverflow.com/a/40712635/4419423

Does an Event fire when adding a property to the window element?

When loading JavaScript libraries (like jQuery), they tend to create an object on the Window element.
I'm trying to work out how I can detect when the library has just loaded so I've gone down the path of trying to detect a property change on the window object...
window.addEventListener("DOMAttrModified", invalidate, false);
function invalidate(evt)
{
console.log('attrChange = ' + evt.attrChange);
}
... This doesn't work.
Perhaps someone knows of another way to solve both this solution and a mechanism to detect when an external library has loaded.
p.s. I have looked at the onload tag for the script tag but I'm concerned as it's not in the W3C.
p.p.s. Ultimately, I'm trying to implement a function where it is safe to use jQuery code.

If your js code is lower then script tag then don't worry, html rendering stops while script tag is not loaded, so if your js is lower then library is already loaded.
Also you may check for existence of some variable (like $).
if (typeof jQuery != 'undefined') {
// is loaded
} else {
// is not loaded
}
Or in loop though interval:
var interval = setInterval(function () {
if (typeof jQuery != 'undefined') {
clearInterval(interval);
// do what you want
}
});

How can I force JavaScript to wait until after a dynamically added script file has completed loading?

I'm trying to write a function which will append a javascript file to the DOM, but I am looking to have the rest of the code wait until the newly added JS file is completely loaded. Here is an example of what I am trying to accomplish, although this code doesn't work properly:
$(document).ready(function () {
var newScript = document.createElement("script");
newScript.setAttribute("type", "text/javascript");
newScript.src = "http://www.domain.com/script.js";
document.getElementsByTagName("body")[0].appendChild(newScript);
$(newScript).ready(function () { // This is the idea of what I'm trying to do, but this doesn't seem to actually wait until the new file is completely loaded.
foo.bar(); // foo is a new global variable which is declared in the newScript. This causes an error "foo is not defined".
// Here is where more code I wish to execute should continue.
});
});

As Musa mentioned in the comments above. Use jQuery's getScript and use the success callback function to trigger your other functions.

If you want more robust module loading functionality, then require.js works great in this capacity. Check out: http://requirejs.org/docs/why.html for an overview. I use require.js specifically for lazy-loading script modules.

Using jQuery (as you've tagged), it's extremely easy:
$.getScript('/script.js', function() {
foo.bar();
});

There's a few different ways to do this... via libraries or "by hand," so to speak, using only the browser APIs and straight JavaScript. For an answer on how to do this in JS only, look here for Stoyan's post to give you guidance. Basically, the gist of it is setting an event handler to both the script's unload and onreadystatechange properties and then check to see if the readyState is "loaded" or "complete" (if it exists at all). It would look something like this:
var done = false;
newScript.onload = newScript.onreadystatechange = function () {
if (!done && (!newScript.readyState || newScript.readyState === "loaded" || newScript.readyState === "complete)) {
done = true;
// run your actual code here
}
};

Trigger $document.ready (so AJAX code I can't modify is executed)

My requirements are the following:
I've got a rich webpage that at a certain moment loads a bunch of HTML in a div, via AJAX.
The HTML I retrieve does have javascript (<script>...</script>)
The retrieved javascript contains $('document').ready( ... ) parts
I can not modify the retrieved javascript; it comes from an external lib
I've got a javascript function that is called when the AJAX is loaded. I'm trying to "trick it" into executing by doing:
function AjaxLoaded() {
$('document').trigger('ready');
}
That doesn't cut it, I'm afraid.
I've seen several responses on Stack Overflow that "evade" this question by changing the code that is returned on the AJAX (make it a function and call it after loading, or just remove the $(document).ready()). I need to stress out that I can't change the retrieved code on this case.

Afer some research i created a way to get it to work.
here is my test that shows it working: http://www.antiyes.com/test/test2.php
here is the relevant code:
<script>
// easy copy of an array
Array.prototype.copy = function() {
return [].concat(this);
};
// this function is added to jQuery, it allows access to the readylist
// it works for jQuery 1.3.2, it might break on future versions
$.getReadyList = function() {
if(this.readyList != null)
this.myreadylist = this.readyList.copy();
return this.myreadylist;
};
$(document).ready(function() {
alert("blah");
});
</script>
<script>
// this should be added last so it gets all the ready event
$(document).ready(function() {
readylist = $.getReadyList();
});
</script>
then in the body I have:
<input type="button" onclick="$(readylist).each(function(){this();});" value="trigger ready" />
basically what i did was add a function to jQuery that copies the readyList before it's cleared out, then it will be available to be used by you.
it looks like the code below doesnt work:
function AjaxLoaded() {
$(document).trigger('ready');
}
drop the quotes around document.

Since the jQuery readyList is not exposed as of version 1.4 (discussed here) the nice solutions above are broken.
A way around this is by creating your own readyList, through overriding the original jQuery-ready method. This needs to be done before other scripts that use the original ready method are loaded. Otherwise just the same code as John/Kikito:
// Overrides jQuery-ready and makes it triggerable with $.triggerReady
// This script needs to be included before other scripts using the jQuery-ready.
// Tested with jQuery 1.7
(function(){
var readyList = [];
// Store a reference to the original ready method.
var originalReadyMethod = jQuery.fn.ready;
// Override jQuery.fn.ready
jQuery.fn.ready = function(){
if(arguments.length && arguments.length > 0 && typeof arguments[0] === 'function') {
readyList.push(arguments[0]);
}
// Execute the original method.
originalReadyMethod.apply( this, arguments );
};
// Used to trigger all ready events
$.triggerReady = function() {
$(readyList).each(function(){this();});
};
})();
I'm not sure whether it is advisable to override the ready method. Feel free to advise me on that. I have not yet found any side effects myself though.

Just in case anyone needs it, I refined John's solution a bit so it could be used directly as an included javascript file.
// jquery_trigger_ready.js
// this function is added to jQuery, it allows access to the readylist
// it works for jQuery 1.3.2, it might break on future versions
$.getReadyList = function() {
if(this.readyList != null) { this.myreadylist = [].concat(this.readyList); }
return this.myreadylist;
};
$(document).ready(function() {
readylist = $.getReadyList();
});
$.triggerReady = function() {
$(readylist).each(function(){this();});
}
Including this file after including jquery allows for triggering ready by invoking $.triggerReady(). Example:
<html>
<head>
<title>trigger ready event</title>
<script src="test2_files/jquery-1.js" type="text/javascript"></script>
<script src="jquery_trigger_ready.js" type="text/javascript"></script>
</head>
<body>
<input onclick="$.triggerReady();" value="trigger ready" type="button">
<script type="text/javascript">
$(document).ready(function(){
alert("blah");
});
</script>
</body>
</html>
By the way, I wanted to make it $(document).triggerReady(). If anyone is willing to share some advice on that, ill be appreciated.

We had the same problem and solved it another way.
Instead of
$(document).ready(function () {
$('.specialClass').click(....
We used :
$(document).bind('ready', function(event) {
$('.specialClass', event.target).click(..
jQuery will trigger a "ready" event on the document as usual. When we load the content of a new div via ajax, we can write:
loadedDiv.trigger('ready')
And have all the initialization performed only on the div, obtaining what expected.

Simone Gianni's Answer I think is the most elegant and clean.
and you can even simplify it to become even more easy to use:
jQuery.fn.loadExtended = function(url,completeCallback){
return this.load(url,function(responseText, textStatus, XMLHttpRequest) {
if (completeCallback !== undefined && completeCallback !== null) {
completeCallback(responseText, textStatus, XMLHttpRequest);
}
$(this).trigger("ready");
});
};
So, now instead of using:
$(".container").load(url,function(responseText, textStatus, XMLHttpRequest) {
$(this).trigger("ready");
});
you can just use:
$(".container").loadExtended("tag_cloud.html");
or:
$(".container").loadExtended("tag_cloud.html",function(){
alert('callback function')
});
This has the advantage of only applying the trigger on the div that's being updated.

If your new loaded HTML contain <script> elements and you try insert it into main HTML with pure JS (element.innerHTML = newHTML), then $(document).ready handlers at newHTML and wrapped functions like (function() { /* some functions */ })(); - will not execute because JQuery unbind 'ready' event after first triggering and you can not trigger it repeatly. PS. But you can use $.holdReady(true) and trigger when need.
So, try insert code with jquery method, $(element).html(newHTML). This solved similar problem for me, seems jquery handle js before inserting. Using this method you also will not see the <script> elements among DOM nodes (at browser's Elements Inspector for ex.)

CKEditor instance already exists

I am using jquery dialogs to present forms (fetched via AJAX). On some forms I am using a CKEditor for the textareas. The editor displays fine on the first load.
When the user cancels the dialog, I am removing the contents so that they are loaded fresh on a later request. The issue is, once the dialog is reloaded, the CKEditor claims the editor already exists.
uncaught exception: [CKEDITOR.editor] The instance "textarea_name" already exists.
The API includes a method for destroying existing editors, and I have seen people claiming this is a solution:
if (CKEDITOR.instances['textarea_name']) {
CKEDITOR.instances['textarea_name'].destroy();
}
CKEDITOR.replace('textarea_name');
This is not working for me, as I receive a new error instead:
TypeError: Result of expression 'i.contentWindow' [null] is not an object.
This error seems to occur on the "destroy()" rather than the "replace()". Has anyone experienced this and found a different solution?
Is is possible to 're-render' the existing editor, rather than destroying and replacing it?
UPDATED
Here is another question dealing with the same problem, but he has provided a downloadable test case.

For this to work you need to pass boolean parameter true when destroying instance:
var editor = CKEDITOR.instances[name];
if (editor) { editor.destroy(true); }
CKEDITOR.replace(name);

function loadEditor(id)
{
var instance = CKEDITOR.instances[id];
if(instance)
{
CKEDITOR.remove(instance);
}
CKEDITOR.replace(id);
}

I had this problem too, but I solved it in a much simpler way...
I was using the class "ckeditor" in my jQuery script as the selector for which textareas I wanted use for CKEditor. The default ckeditor JS script also uses this class to identify which textareas to use for CKEditor.
This meant there is a conflict between my jQuery script and the default ckeditor script.
I simply changed the class of the textarea and my jQuery script to 'do_ckeditor'(you could use anything except "ckeditor") and it worked.

This is the simplest (and only) solution that worked for me:
if(CKEDITOR.instances[editorName])
delete CKEDITOR.instances[editorName];
CKEDITOR.replace(editorName);
Deleting this entry in the array prevents this form safety check from destroying your application.
destroy() and remove() did not work for me.

Perhaps this will help you out - I've done something similar using jquery, except I'm loading up an unknown number of ckeditor objects. It took my a while to stumble onto this - it's not clear in the documentation.
function loadEditors() {
var $editors = $("textarea.ckeditor");
if ($editors.length) {
$editors.each(function() {
var editorID = $(this).attr("id");
var instance = CKEDITOR.instances[editorID];
if (instance) { instance.destroy(true); }
CKEDITOR.replace(editorID);
});
}
}
And here is what I run to get the content from the editors:
var $editors = $("textarea.ckeditor");
if ($editors.length) {
$editors.each(function() {
var instance = CKEDITOR.instances[$(this).attr("id")];
if (instance) { $(this).val(instance.getData()); }
});
}
UPDATE: I've changed my answer to use the correct method - which is .destroy(). .remove() is meant to be internal, and was improperly documented at one point.

var e= CKEDITOR.instances['sample'];
e.destroy();
e= null;

I've had similar issue where we were making several instances of CKeditor for the content loaded via ajax.
CKEDITOR.remove()
Kept the DOM in the memory and didn't remove all the bindings.
CKEDITOR.instance[instance_id].destroy()
Gave the error i.contentWindow error whenever I create new instance with new data from ajax. But this was only until I figured out that I was destroying the instance after clearing the DOM.
Use destroy() while the instance & it's DOM is present on the page, then it works perfectly fine.

For ajax requests,
for(k in CKEDITOR.instances){
var instance = CKEDITOR.instances[k];
instance.destroy()
}
CKEDITOR.replaceAll();
this snipped removes all instances from document.
Then creates new instances.

The i.contentWindow is null error seems to occur when calling destroy on an editor instance that was tied to a textarea no longer in the DOM.
CKEDITORY.destroy takes a parameter noUpdate.
The APIdoc states:
If the instance is replacing a DOM element, this parameter indicates whether or not to update the element with the instance contents.
So, to avoid the error, either call destroy before removing the textarea element from the DOM, or call destory(true) to avoid trying to update the non-existent DOM element.
if (CKEDITOR.instances['textarea_name']) {
CKEDITOR.instances['textarea_name'].destroy(true);
}
(using version 3.6.2 with jQuery adapter)

This is what worked for me:
for(name in CKEDITOR.instances)
{
CKEDITOR.instances[name].destroy()
}

CKEDITOR.instances = new Array();
I am using this before my calls to create an instance (ones per page load). Not sure how this affects memory handling and what not. This would only work if you wanted to replace all of the instances on a page.

I've prepared my own solution based on all above codes.
$("textarea.ckeditor")
.each(function () {
var editorId = $(this).attr("id");
try {
var instance = CKEDITOR.instances[editorId];
if (instance) { instance.destroy(true); }
}
catch(e) {}
finally {
CKEDITOR.replace(editorId);
}
});
It works perfectly for me.
Sometimes after AJAX request there is wrong DOM structure.
For instace:
<div id="result">
<div id="result>
//CONTENT
</div>
</div>
This will cause issue as well, and ckEditor will not work. So make sure that you have correct DOM structure.

i had the same problem with instances, i was looking everywhere and finally this implementation works for me:
//set my instance id on a variable
myinstance = CKEDITOR.instances['info'];
//check if my instance already exist
if (myinstance) {
CKEDITOR.remove(info)
}
//call ckeditor again
$('#info').ckeditor({
toolbar: 'Basic',
entities: false,
basicEntities: false
});

You can remove any ckeditor instance by remove method of ckeditor. Instance will be id or name of the textarea.
if (CKEDITOR.instances[instance_name]) {
CKEDITOR.remove(CKEDITOR.instances[instance_name]);
}

Indeed, removing the ".ckeditor" class from your code solves the issue. Most of us followed the jQuery integration example from the ckeditor's documentation:
$('.jquery_ckeditor')
.ckeditor( function() { /* callback code */ }, { skin : 'office2003' } );
and thought "... maybe I can just get rid or the '.jquery_' part".
I've been wasting my time tweaking the callback function (because the {skin:'office2003'} actually worked), while the problem was coming from elsewhere.
I think the documentation should mention that the use of "ckeditor" as a class name is not recommended, because it is a reserved keyword.
Cheers.

I learned that
delete CKEDITOR.instances[editorName];
by itself, actually removed the instance. ALL other methods i have read and seen, including what was found here at stackoverflow from its users, did not work for me.
In my situation, im using an ajax call to pull a copy of the content wrapped around the and 's. The problem happens to be because i am using a jQuery .live event to bind a "Edit this document" link and then applying the ckeditor instance after success of the ajax load. This means, that when i click another link a link with another .live event, i must use the delete CKEDITOR.instances[editorName] as part of my task of clearing the content window (holding the form), then re-fetching content held in the database or other resource.

I hade the same problem with a jQuery Dialog.
Why destroy the instance if you just want to remove previous data ?
function clearEditor(id)
{
var instance = CKEDITOR.instances[id];
if(instance)
{
instance.setData( '' );
}
}

I chose to rename all instances instead of destroy/replace - since sometimes the AJAX loaded instance doesn't really replace the one on the core of the page... keeps more in RAM, but less conflict this way.
if (CKEDITOR && CKEDITOR.instances) {
for (var oldName in CKEDITOR.instances) {
var newName = "ajax"+oldName;
CKEDITOR.instances[newName] = CKEDITOR.instances[oldName];
CKEDITOR.instances[newName].name = newName;
delete CKEDITOR.instances[oldName];
}
}

I am in the situation where I have to controls that spawn dialogs, each of them need to have a ckeditor embedded inside these dialogs. And it just so happens the text areas share the same id. (normally this is very bad practice, but I have 2 jqGrids, one of assigned items and another of unassigned items.) They share almost identical configuration. Thus, I am using common code to configure both.
So, when I load a dialog, for adding rows, or for editing them, from either jqGrid; I must remove all instances of CKEDITOR in all textareas.
$('textarea').each(function()
{
try
{
if(CKEDITOR.instances[$(this)[0].id] != null)
{
CKEDITOR.instances[$(this)[0].id].destroy();
}
}
catch(e)
{
}
});
This will loop over all textareas, and if there is a CKEDITOR instance, then destroy it.
Alternatively if you use pure jQuery:
$('textarea').each(function()
{
try
{
$(this).ckeditorGet().destroy();
}
catch(e)
{
}
});

remove class="ckeditor" , it might have triggered ckeditor initialization

I had the same problem where I was receiving a null reference exception and the word "null" would be displayed in the editor. I tried a handful of solutions, including upgrading the editor to 3.4.1 to no avail.
I ended up having to edit the source. At about line 416 to 426 in _source\plugins\wysiwygarea\plugin.js, there's a snippet like this:
iframe = CKEDITOR.dom.element.createFromHtml( '<iframe' + ... + '></iframe>' );
In FF at least, the iframe isn't completely instantiated by the time it's needed. I surrounded the rest of the function after that line with a setTimeout function:
iframe = CKEDITOR.dom.element.createFromHtml( '<iframe' + ... + '></iframe>' );
setTimeout(function()
{
// Running inside of Firefox chrome the load event doesn't bubble like in a normal page (#5689)
...
}, 1000);
};
// The script that launches the bootstrap logic on 'domReady', so the document
...
The text renders consistently now in the modal dialogs.

To support dynamic (Ajax) loading of forms (without page refreshes between) which contain textareas with the same (same form is called again) or different ID's (previously unloaded form) and convert them to CKEditor elements I did the following (using the JQuery adapter):
After the page has finished every Ajax call that delivers a textarea to be converted, I make a call to the following function:
setupCKeditor()
This looks like this (it assumes your textareas to be converted to RTE's have class="yourCKClass"):
/* Turns textAreas into TinyMCE Rich Text Editors where
* class: tinymce applied to textarea.
*/
function setupCKeditor(){
// define editor configuration
var config = {skin : 'kama'};
// Remove and recreate any existing CKEditor instances
var count = 0;
if (CKEDITOR.instances !== 'undefined') {
for(var i in CKEDITOR.instances) {
var oEditor = CKEDITOR.instances[i];
var editorName = oEditor.name;
// Get the editor data.
var data = $('#'+editorName).val();
// Check if current instance in loop is the same as the textarea on current page
if ($('textarea.yourCKClass').attr('id') == editorName) {
if(CKEDITOR.instances[editorName]) {
// delete and recreate the editor
delete CKEDITOR.instances[editorName];
$('#'+editorName).ckeditor(function() { },config);
count++;
}
}
}
}
// If no editor's exist in the DOM, create any that are needed.
if (count == 0){
$('textarea.yourCKClass').each( function(index) {
var editorName = $(this).attr('id');
$('#'+editorName).ckeditor(function() { $('#'+editorName).val(data); },config);
});
}
}
I should mention that the line:
$('#'+editorName).ckeditor(function() { $('#'+editorName).val(data); },config);
could (and should) be simply:
$('#'+editorName).ckeditor(function() { },config);
however I found that the editor would often show the correct content for a second after loading and them empty the editor of the desired content. So that line with the callback code forces the CKEditor content to be the same as the originating textarea content. Causes a flicker when used. If you can avoid using it, do so..

I had exactly the same problem like jackboberg. I was using dynamic form loading into jquery dialogs then attaching various widgets (datepickers, ckeditors etc...).
And I tried all solutions noted above, none of them worked for me.
For some reason ckeditor only attached the first time I loaded form, the second time I got exactly the same error message jackboberg did.
I've analyzed my code and discovered that if you attach ckeditor in "mid-air" that is while form content is still not placed into dialog, ckeditor won't properly attach its bindings. That is since ckeditor is attached in "mid-air", second time you attach it in "mid-air"... poof ... an error is thrown since the first instance was not properly removed from DOM.
This was my code that ptoduced the error:
var $content = $(r.content); // jQuery can create DOM nodes from html text gotten from <xhr response> - so called "mid-air" DOM creation
$('.rte-field',$content).ckeditor(function(){});
$content.dialog();
This is the fix that worked:
var $content = $(r.content).dialog(); // first create dialog
$('.rte-field',$content).ckeditor(function(){}); // then attach ckeditor widget

I ran into this exact same thing and the problem was that the wordcount plugin was taking too long to initialize. 30+ seconds. The user would click into the view displaying the ckeditor, then cancel, thereby ajax-loading a new page into the dom. The plugin was complaining because the iframe or whatever contentWindow is pointing to was no longer visible by the time it was ready to add itself to the contentWindow. You can verify this by clicking into your view and then waiting for the Word Count to appear in the bottom right of the editor. If you cancel now, you won't have a problem. If you don't wait for it, you'll get the i.contentWindow is null error. To fix it, just scrap the plugin:
if (CKEDITOR.instances['textarea_name'])
{
CKEDITOR.instances['textarea_name'].destroy();
}
CKEDITOR.replace('textarea_name', { removePlugins: "wordcount" } );
If you need a word counter, register for the paste and keyup events on the editor with a function that counts the words.

For those using the jquery "adapter" and having trouble (as I was), as super hackish yet working solution is to do something like this:
// content editor plugin
(function($){
$.fn.contentEditor = function( params ) {
var xParams = $.extend({}, $.fn.contentEditor.defaultParams, params);
return this.each( function() {
var $editor = $(this);
var $params = $.extend({}, xParams, $editor.data());
// if identifier is set, detect type based on identifier in $editor
if( $params.identifier.type ) {
$params.type = $editor.find($params.identifier.type).val();
}
$editor.data('type', $params.type);
// edit functionality
editButton = $('<button>Edit Content</button>').on('click',function(){
// content container
var $cc = $('#' + $editor.data('type'));
// editor window
var $ew = $('<form class="editorWindow" />');
$ew.appendTo('body');
// editor content
$ec = $('<textarea name="editorContent" />').val($cc.html());
$ec.appendTo($ew);
$ec.ckeditor();
//$ec.ckeditorGet().setMode('source');
$ew.dialog({
"autoOpen": true,
"modal": true,
"draggable": false,
"resizable": false,
"width": 850,
"height": 'auto',
"title": "Content Editor",
"buttons": {
'Save': function() {
$cc.html( $ec.val() );
$ec.ckeditorGet().destroy();
$ew.remove();
},
'Cancel / Close': function() {
$ec.ckeditorGet().destroy();
$ew.remove();
}
},
'close': function() {
$ec.ckeditorGet().destroy();
},
'open': function() {
$ew.find('a.cke_button_source').click();
setTimeout(function(){
$ew.find('a.cke_button_source.cke_on').click();
}, 500);
}
});
return false;
});
editButton.appendTo( $editor );
});
}
// set default option values
$.fn.contentEditor.defaultParams = {
'identifier': {
'type': 'input[name="type"]'
}
};
})(jQuery);
$(function(){
$('form.contentEditor').contentEditor();
});
The key point being this part:
'open': function() {
$ew.find('a.cke_button_source').click();
setTimeout(function(){
$ew.find('a.cke_button_source.cke_on').click();
}, 500);
}
This fixes the problem with the editor text not being visible the next time you open the dialog. I realise this is very hackish, but considering that most of these are going to be used for admin tools, I don't think that's as big a concern as it normally would be.. and this works, so hopefully it will save someone some time ;)

This is the fully working code for jquery .load() api and ckeditor, in my case I am loading a page with ckeditor into div with some jquery effects. I hope it will help you.
$(function() {
runEffect = function(fileload,lessonid,act) {
var selectedEffect = 'drop';
var options = {};
$( "#effect" ).effect( selectedEffect, options, 200, callback(fileload,lessonid,act) );
};
function callback(fileload,lessonid,act) {
setTimeout(function() {//load the page in effect div
$( "#effect" ).load(fileload,{lessonid:lessonid,act:act});
$("#effect").show( "drop",
{direction: "right"}, 200 );
$("#effect").ajaxComplete(function(event, XMLHttpRequest, ajaxOptions) {
loadCKeditor(); //call the function after loading page
});
}, 100 );
};
function loadCKeditor()
{//you need to destroy the instance if already exist
if (CKEDITOR.instances['introduction'])
{
CKEDITOR.instances['introduction'].destroy();
}
CKEDITOR.replace('introduction').getSelection().getSelectedText();
}
});
===================== button for call the function ================================
<input type="button" name="button" id="button" onclick="runEffect('lesson.php','','add')" >

Its pretty simple. In my case, I ran the below jquery method that will destroy ckeditor instances during a page load. This did the trick and resolved the issue -
JQuery method -
function resetCkEditorsOnLoad(){
for(var i in CKEDITOR.instances) {
editor = CKEDITOR.instances[i];
editor.destroy();
editor = null;
}
}
$(function() {
$(".form-button").button();
$(".button").button();
resetCkEditorsOnLoad(); // CALLING THE METHOD DURING THE PAGE LOAD
.... blah.. blah.. blah.... // REST OF YOUR BUSINESS LOGIC GOES HERE
});
That's it. I hope it helps you.
Cheers,
Sirish.

This functions works for me in CKEditor version 4.4.5, it does not have any memory leaks
function CKEditor_Render(CkEditor_id) {
var instance = CKEDITOR.instances[CkEditor_id];
if (CKEDITOR.instances.instance) {
CKEDITOR.instances.instance.destroy();
}
CKEDITOR.replace(CkEditor_id);
}
// call this function as below
var id = 'ckeditor'; // Id of your textarea
CKEditor_Render(id);

CKeditor 4.2.1
There is a lot of answers here but for me I needed something more (bit dirty too so if anyone can improve please do). For me MODALs where my issue.
I was rendering the CKEditor in a modal, using Foundation. Ideally I would have destoryed the editor upon closing, however I didn't want to mess with Foundation.
I called delete, I tried remove and another method but this was what I finally settled with.
I was using textarea's to populate not DIVs.
My Solution
//hard code the DIV removal (due to duplication of CKeditors on page however they didn't work)
$("#cke_myckeditorname").remove();
if (CKEDITOR.instances['myckeditorname']) {
delete CKEDITOR.instances['myckeditorname'];
CKEDITOR.replace('myckeditorname', GetCKEditorSettings());
} else {
CKEDITOR.replace('myckeditorname', GetCKEditorSettings());
}
this was my method to return my specific formatting, which you might not want.
function GetCKEditorSettings()
{
return {
linkShowAdvancedTab: false,
linkShowTargetTab: false,
removePlugins: 'elementspath,magicline',
extraAllowedContent: 'hr blockquote div',
fontSize_sizes: 'small/8px;normal/12px;large/16px;larger/24px;huge/36px;',
toolbar: [
['FontSize'],
['Bold', 'Italic', 'Underline', '-', 'NumberedList', 'BulletedList', '-', 'Link', 'Unlink'],
['Smiley']
]
};
}

Try this:
for (name in CKEDITOR.instances)
{
CKEDITOR.instances[name].destroy(true);
}