js检测提交是否空不能提交

来源：互联网发布：上海公务员备考知乎编辑：程序博客网时间：2024/06/01 08:50

html部分：

<form action="{:U('Index/addliuyan')}" name='wish' method="post" id="wish" onsubmit="return check()">   <p>      <label for="username">昵称：</label>      <input class="name" type="text" name='username' id='username'/>   </p>   <p>      <label for="content">愿望：(您还可以输入&nbsp;<span id='font-num'>50</span>&nbsp;个字)</label>      <textarea name="content" id='content'></textarea>      <div id='phiz'>         <img src="__PUBLIC__/Images/phiz/zhuakuang.gif" alt="抓狂" />         <img src="__PUBLIC__/Images/phiz/baobao.gif" alt="抱抱" />         <img src="__PUBLIC__/Images/phiz/haixiu.gif" alt="害羞" />         <img src="__PUBLIC__/Images/phiz/ku.gif" alt="酷" />         <img src="__PUBLIC__/Images/phiz/xixi.gif" alt="嘻嘻" />         <img src="__PUBLIC__/Images/phiz/taikaixin.gif" alt="太开心" />         <img src="__PUBLIC__/Images/phiz/touxiao.gif" alt="偷笑" />         <img src="__PUBLIC__/Images/phiz/qian.gif" alt="钱" />         <img src="__PUBLIC__/Images/phiz/huaxin.gif" alt="花心" />         <img src="__PUBLIC__/Images/phiz/jiyan.gif" alt="挤眼" />      </div>   </p>   <!--<span id='send-btn'></span>-->   <input class="p_btn" type="submit" value="提交"></form>

js部分：

//检测表单提交是否为空function check(){   var username=document.getElementById('username').value;//昵称   var content=document.getElementById('content').value;//愿望   if(username=="") {      alert('昵称不能为空');      document.wish.username.focus();      return false;   }   if(content==""){      alert('愿望不能为空');      document.wish.content.focus();      return false;      }      return true;}

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