如何通过javascript防止回发

Question

实际上这个代码在firfox mozila中运行良好,但它在IE8中不起作用

<asp:Button ID="btnSubmit" runat="server" Text="Submit" CssClass="btnPrimary" OnClientClick="return doSubmit('this');"
        OnClick="btnSubmit_Click" />
      <script type="text/javascript">
           function doSubmit() 
           {
            var ansLength = oDOM.body.innerText.trim().length;
            if (ansLength == 0 && smielyPresent == -1) 
              {
              alert("you cannot submit blank answer");
              return false;
              }
           }
    </script>

     protected void btnSubmit_Click(object sender, EventArgs e)
    {
      // i am doing some stuff
    }

在这里我想要防止回发时answerlength == 0 ; ,但当answer length ==0它然后它提醒 alert("u can't submit blank answer")消息和回发服务器io想要阻止它我怎么办？

Answer 1

它不起作用，因为您的 javascript 中有脚本错误。

<script type="text/javascript">
    function doSubmit() 
    {
        //I've removed the first equal sign
        var ansLength = oDOM.body.innerText.trim().length; 
        if (ansLength == 0 && smielyPresent == -1) //typo on smielyPresent ?
        {
            alert("u can't submit blank answer")
            return false;
        }
    }
</script>