I want to add client side validation for file upload using HTML5 "accept" attribute and ExtJs "inputAttrTpl" config. My ExtJs code is following (ExtJs 4.1):

{
              xtype : 'filefield',
              action : 'upload',
              name : 'file',
              inputAttrTpl: 'accept="image/*"',
              hideLabel : true,
              buttonOnly : true,
              anchor : '100%',
              buttonText : 'Upload img...',
              margin: 5
}

But when I am checking file field in firebug, it doesn't contain "accept" attribute. Can you suggest some solutions for this issue? Thanks for your replies.

javascript html extjs
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