javascript事件（4）

禁止无效字符：

<input type="input" invalidchars="0123456789" onkeypress="return TextUtil.blockChars(this,event)"/>

var TextUtil = new Object();

TextUtil.blockChars = function(obj, oEvent)

{

   var oE = EventUtil.formatEvent(oEvent);   

   var invalidChar = obj.getAttribute("invalidchars");

   var sChar = String.formCharCode(oEvent.charCode);

   var isBlock = invalidChar.indexOf(sChar) == -1

 return isBlock || oEvent.ctrl.ctrlKey

}