Text Field entry allow only Numeric

 type='text' onkeypress='validate(event)' />



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function validate(evt) {

  var theEvent = evt || window.event;

  var key = theEvent.keyCode || theEvent.which;

  key = String.fromCharCode( key );

  var regex = /[0-9]|\./;

  if( !regex.test(key) ) {

    theEvent.returnValue = false;

    theEvent.preventDefault();

  }

}