Set field to typeahead to true

  
<html>
<head>
<title>Hello World Window</title>
<link rel="stylesheet" type="text/css" href="ext-3.0.0/resources/css/ext-all.css" />
<script type="text/javascript" src="ext-3.0.0/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="ext-3.0.0/ext-all.js"></script>

</head>
<body>
<script type="text/javascript">
Ext.onReady(function() {
    Ext.QuickTips.init();
    var names = [
        ['A'],
        ['B'],
        ['C'],
        ['D']
    ];
    var mySimpleStore = new Ext.data.ArrayStore({
        data   : names,
        fields : ['name']
    });
    var combo = {
        xtype        : 'combo',
        fieldLabel   : 'Letter',
        store        : mySimpleStore,
        displayField : 'name',
        typeAhead    : true,
        mode         : 'local'
    }
    new Ext.Window({
        title      : 'Title here',
        height     : 100,
        layout     : 'form',
        labelWidth : 80,
        bodyStyle  : 'padding: 5px',
        items      : combo
    }).show()
});
</script> 
<div id='div1'>asdf</div>
</body>
</html>

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Set field to typeahead to true : Form Fields « Ext JS « JavaScript DHTML

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