ExtJS上传图片预览功能

代码//上传图片类型
var img_reg = /\.([jJ][pP][gG]){1}$|\.([jJ][pP][eE][gG]){1}$|\.([gG][iI][fF]){1}$|\.([pP][nN][gG]){1}$|\.([bB][mM][pP]){1}$/

Ext.extend(simpleForm,Ext.form.FormPanel,{
listeners:
{
'render':function(f)
{
this.form.findField('imageupload').on('render',function()
{
Ext.get('imageupload').on('change',function(field,newValue,oldValue )
{

var url = 'file:///'+Ext.get('imageupload').dom.value;

if(img_reg.test(url))
{

if(Ext.isIE)
{
var image = Ext.get('imageBrowse').dom;
image.src = Ext.BLANK_IMAGE_URL;//覆盖原来的图片
image.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src=url;

}//支持FF
else
{
Ext.get('imageBrowse').dom.src =Ext.get('imageupload').dom.files.item(0).getAsDataURL()
}
}
},this);
},this);
}
}

});