JS表单提交验证实现代码

<form name="templateForm" method="POST">
       <input type="hidden" name="event_submit_do_add" value=""/>
       <input type="hidden" name="event_submit_do_update" value=""/>
      ------------------------
       #if("$templateId"=="0")
       <input type="button" name="J_Add" id="J_Add" class="J_Submit" value="保存" style="margin:0 10px;padding:0 5px;"/>
      #else
       <input type="button" name="J_Update" id="J_Update" class="J_Submit" value="修改" style="margin:0 10px;padding:0 5px;"/>
       #end
  </form>

<script language='text/javascript'>

var Y = YAHOO.util, D = Y.Dom, E = Y.Event;
 E.on("J_Add","click",function(evt){
  if(“验证条件")
  {
    alter("提示内容");
    return;
   }
  document.templateForm.event_submit_do_add.value="submit";
  document.templateForm.submit();
 });

 E.on("J_Update","click",function(evt){
  if(“验证条件")
  {
    alter("提示内容");
    return;
   }
  document.templateForm.event_submit_do_update.value="submit";
  document.templateForm.submit();
 });
</script>