{
xtype:'combo', id: 'shoutoutsTags',
fieldLabel: 'Tag',
value: '',
mode: 'local',
width: 200,
store: new Ext.data.JsonStore({
url: 'get_data.php',
fields: ['id', 'name'],
root: 'tags',
autoLoad: true
}),
displayField: 'name',
valueField: 'id',
forceSelection: true,
triggerAction: 'all',

hiddenName: 'mytag' //dont put it the same name as name filed value
},

via Enlightenment: Extjs AUTO complete of combo box.

Other ideas:
http://www.fusioncube.net/?p=222
http://www.extjs.com/forum/showthread.php?t=19529&highlight=dwr

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