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POExtJS combobox problem in IE
 

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    <p>I have an ExtJS combobox with a remote data store behind it. In all browsers it works fine, except in IE (all versions that I've tested) where the combobox expands for a splitsecond, showing a "loading" icon and then it disappears again. Clicking it again after this doesn't make it expand at all anymore. Basically: it's not being populated. </p> <p>On the server side, everything is fine. The Controller action is reached (using ASP.NET MVC) which returns Json data. The Json is properly formed (all other browsers swallow it at least). </p> <p>A weird thing is, that when I put a breakpoint in the Controller action, the JsonStore is properly filled on the client side. This to me indicates some sort of timing problem. </p> <p>Another weird thing is that, every once in a while, it works fine. Perhaps because the timing is just right by accident or something.</p> <p>If I set the combobox mode to 'local' and force a <code>.load()</code> on the remote datastore, it works fine in IE too. </p> <p>This problem is present in all comboboxes that use a remote datastore for us.</p> <p>I have the following JsonStore:</p> <pre><code> var companies = new Ext.data.JsonStore({ url: '/Company/GetCompanies/', root: 'companies', fields: [ { name: 'CompanyID'}, { name: 'CompanyName'}] }); </code></pre> <p>The combobox:</p> <pre><code>new Ext.form.ComboBox({ fieldLabel: 'Company', typeAhead: false, triggerAction: 'all', valueField: 'CompanyID', hiddenName: 'CompanyID', displayField: 'CompanyName', mode: 'remote', lazyRender: true, store: companies, allowBlank: true, editable: false, listeners: { 'focus': function(){ if(companies.data.length &gt; 0) { debugger; // This is only ever fired after the aforementioned breakpoint method. } } } }) </code></pre> <p>The Json that is returned by the Controller:</p> <pre><code>{"companies":[{"CompanyID":1,"CompanyName":"Test"},{"CompanyID":2,"CompanyName":"Test1" },{"CompanyID":3,"CompanyName":"Test2"}]} </code></pre>
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