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Using Ext JS in SharePoint... a tip

Friday, September 26th, 2008

Continuing with my SharePoint fun with JavaScript, I have been using Ext JS embedded into SharePoint for some development lately, and was continually receiving the error "Ext is undefined" while trying to load the generic, always-used, Ext.onReady function, such as follows:

... my perfect code here ...

It turns out that the problem is caused by SharePoint yet again mangling the things that normally work perfectly, and as-expected. SharePoint manipulates the script tags on the page (for whatever reason is beyond me) which in turn effects the loading order of these scripts. I was receiving the "Ext is undefined" message because of exactly that, Ext, at that time, was still undefined.

The only way that I could find to get around this for the time being, until myself or someone else finds a better way, was to wrap the Ext code in the generic body.onLoad event, such as follows:

document.body.onload = function() {
... my not so perfect code here ...

Hopefully this will once again save someone a SharePoint JavaScript head ache, as it definitely caused one for myself.

JavaScript SharePoint Skeptical Tom Out.


SharePoint JavaScript

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Tom said on Thursday, June 18th, 2009 @ 10:30 AM

Hi Henry,
Glad to hear it helped, this was one that drove me crazy for a while, so I feel your pain!

Henry said on Thursday, June 18th, 2009 @ 10:06 AM

I was having this very same issue. I had the suspicion that somehow Sharepoint is messing with the script since it had worked perfectly fine outside of Sharepoint. Thanks for info!

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