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How to prevent repeated submission of forms using js

一个新手Original: 2017-09-18 10:41:331664browse

Through js control, set a Boolean value for judgment. Change the value after submission, and then submit again and it will not pass.

The code is as follows:

<!DOCTYPE HTML><html>
  <head>
    <title>Form表单</title>
  </head>

   <script type="text/javascript">
        var isCommitted = false;//表单是否已经提交标识，默认为false
        function dosubmit(){
            if(isCommitted==false){
                isCommitted = true;//提交表单后，将表单是否已经提交标识设置为true
                return true;//返回true让表单正常提交
            }else{                return false;//返回false那么表单将不提交
            }
        }    </script>
  <body>
      <form action="${pageContext.request.contextPath}/servlet/DoFormServlet" onsubmit="return dosubmit()" method="post">
        用户名：<input type="text" name="username">
        <input type="submit" value="提交" id="submit">
    </form>
  </body>
  </html>

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