c# - 如何通过javascript防止回发

Question

实际上这段代码在 firefox mozilla 中运行良好，但在 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
    }

这里我想在 answerlength == 0 ; 时阻止回发但是当 answer length ==0 时，它会提醒 alert("u can't submit blank answer") 消息并回发到服务器 io 想要阻止它，我该怎么做？

Answer 1

它不起作用，因为您的 javascript 中存在脚本错误。

<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>