javasrcipt限制textbox內容為數字

1.body之間：


script language="javascript" type="text/javascript"

 function   NumberText()
  {
  if(!(((window.event.keyCode>=48)&&(window.event.keyCode<=57))||(window.event.keyCode==13)||(window.event.keyCode==46)||(window.event.keyCode==45)))
  {
        window.event.keyCode=0;
  }
  }

/script


2.textbox內

asp:TextBox ID="txtInputChtno" onkeypress="NumberText()"  runat="server"

3.aspx.cs後端程式碼 事件內(ex: PageLoad)
txtInputChtno.Attributes.Add("onkeypress", "NumberText()");