I have the Expresso field-type plugin and I'm using the Embed Media button to add iFrames to the page. I've been trying to add a class to the parent div container however I just can't seem to get it to work.

Expresso uses CKEditor and this is what I've tried so far:

(function() {
    CKEDITOR.plugins.add("mediaembed", {
        init: function(a) {
            CKEDITOR.dialog.add("MediaEmbedDialog", function(a) {
                return {
                    title: "Embed Media",
                    minWidth: 550,
                    minHeight: 200,
                    contents: [{
                        id: "iframe",
                        expand: !0,
                        elements: [{
                            id: "embedArea",
                            type: "textarea",
                            label: "Paste Embed Code Here",
                            autofocus: "autofocus",
                            setup: function() {},
                            commit: function() {}
                    onOk: function() {
                        var b = a.document.createElement("div");
                        b.setHtml(this.getContentElement("iframe", "embedArea").getValue());
                        b.className = "video-container"; //My addition
                new CKEDITOR.dialogCommand("MediaEmbedDialog", {
                    allowedContent: "iframe[*]"
            a.ui.addButton("MediaEmbed", {
                label: "Embed Media",
                command: "MediaEmbed",
                toolbar: "mediaembed"

Towards the bottom of the function you will see the onOK function where I have added:

b.className = "video-container";

However when I add the iFrame code the parent div has no class. I have tried swapping the var b = a.document.createElement("div"); to a span and this worked fine (still no class though) so I know it's the correct piece of code.

If anyone has any ideas as to why this isn't working it would make my Friday that ever-bit more awesome.

Thank you.

  • Turns out this can be rectified by using b.setAttribute("class", "video-container"); Does anyone know why this works and the className doesn't? Dec 19, 2014 at 12:29

1 Answer 1


Just in case anyone stumbles across this. For the onOk function add the following line of code:

b.setAttribute("class", "video-container");

Add this after the var declaration and before the insertElement function.

This should work for any of the CKEditor plugin functions but double check the variable name first.

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