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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<link rel="stylesheet" type="text/css" href="extjs/resources/css/ext-all.css" />
<script type="text/javascript" src="extjs/adapter/ext/ext-base.js"></script>
<script type="text/javascript" src="extjs/ext-all.js"></script>
<script>
var oForm;
var n=0;
Ext.onReady(function(){
oForm = new Ext.FormPanel({
renderTo:"form_panel",
layout:"form",
hideLabels:false,
border:false,
labelAlign:"right",
labelWidth:70,
items:[
{xtype:'button',text:'click',listeners:{
click:function(){
n++;
var fd = new Ext.form.TextField({name:'xx'+n,id:'xx'+n,fieldLabel:'field'+n});
oForm.items.add(oForm.items.getCount(), fd);
oForm.doLayout();
}
}}
]
});
});
</script>
<div id="form_panel"></div>