很简单的!关于js和checkboxlist?????

Question

<script>
function checked(){
        var n=0;
        for(var i=0;i<document.getElementById("CheckBoxList1").getElementsByTagName("input").length;i++)
            {
            var objCheck = document.getElementById("CheckBoxList1_"+i);
            if(objCheck.checked)
             n++;
            }    
            if(n==0){
             for(var i=0;i<document.getElementById("CheckBoxList1").getElementsByTagName("input").length;i++)
                {
                document.getElementById("CheckBoxList1_"+i).checked = true;
                }
            }         
}
</script><form runat="server">
    <asp:CheckBoxList ID="CheckBoxList1" runat="server">
        <asp:ListItem>a</asp:ListItem>
        <asp:ListItem>b</asp:ListItem>
    </asp:CheckBoxList>
    <input type="button" onclick="checked()" value="点击" />
</form>

Answer 1

  function aa123() 
      {
          var obj = document.getElementById("CheckBoxList1").getElementsByTagName("input");
          for (var i = 0; i < obj.length; i++) 
          {
              if (!obj[i].checked) 
              {
                  obj[i].checked = true;
              }
          }
      }函数名有问题，自己改下，我乱写的，里面也改了下，看你代码因该是这个意思

Answer 2

还是不对，以前是这么些的来着，现在怎么地了？下面是查看的源文件
function checked(){
        var n=0;
        for(var i=0;i<document.getElementById("CheckBoxList1").getElementsByTagName("input").length;i++)
            {
            var objCheck = document.getElementById("CheckBoxList1_"+i);
            if(objCheck.checked)
             n++;
            }    
            if(n==0){
             for(var i=0;i<document.getElementById("CheckBoxList1").getElementsByTagName("input").length;i++)
                {
                document.getElementById("CheckBoxList1_"+i).checked = true;
                }
            }         
}
</script><form name="ctl00" method="post" action="test2.aspx" id="ctl00">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTEyODk4MTI5MTFkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYDBQ9DaGVja0JveExpc3QxJDAFD0NoZWNrQm94TGlzdDEkMQUPQ2hlY2tCb3hMaXN0MSQx8ied9Hii2TmH7VKvi8NHo5A8mDk=" />
</div>    <table id="CheckBoxList1" border="0">
<tr>
<td><input id="CheckBoxList1_0" type="checkbox" name="CheckBoxList1$0" /><label for="CheckBoxList1_0">a</label></td>
</tr><tr>
<td><input id="CheckBoxList1_1" type="checkbox" name="CheckBoxList1$1" /><label for="CheckBoxList1_1">b</label></td>
</tr>
</table>    <input type="button" onclick="checked()" value="点击" /><div> <input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAwLq5YPUDQLww6rJCgKLrcjeBLcNzs5xiI5A8OrsHaX4fz5sd8ol" />
</div></form>

Answer 3

关键是你function checked()那个checked的函数名要改

Answer 4

你这个checked()用了保留字,
改一下名字就可以了!!