Question

I came across a “Ext is not defined” issue in ExtJS 4.
I am actually testing the example here to starting learning ExtJS 4.

I have my example script file included:

<script type="text/javascript" src="orderRead.js"></script>
<script type="text/javascript" src="order.js"></script>

as well as these ExtJS script files:

<script type="text/javascript" src="extjs/ext-all.js"></script>
<script type="text/javascript" src="extjs/ext-all-debug.js"></script>

but the problem is still there. Attached is the error message from Firebug:

Answer 1

Put the script tags for the Ext library before the script tags for your example files, so that they are loaded when your code runs.