js method to implement form serialization to determine null value

When I was learning javaweb, I did the exercise of adding the form information on the page to the database. When submitting a form, you need to ensure that each input box, radio button, check box, etc. is not empty. At the beginning, you get the values ​​of the controls one by one to determine whether they are empty. Later, you learned about form serialization. Just use serialization to determine the null value.

//form form page

<form id="basicInfo" action="EmployeeServlet?flag=addEmployeeInfo" method="post">
  <p class="formbody">
    <p class="formtitle"><span>基本信息</span></p>
    <ul class="forminfo">
      <li>
        <label>员工账号</label>
        <input id="account" name="account" type="text" class="dfinput" readOnly="true" />
        <i>设置员工姓名和入职时间后，系统自动生成，无法更改</i>
      </li>
      <li>
        <label>员工姓名</label>
        <input name="name" type="text" class="dfinput" id="name" />
        <i>姓名不能为数字</i>
      </li>
      <li>
        <label>密码</label>
        <input name="password" type="password" class="dfinput" id="pwd" placeholder="空值或空白则默认密码为123456" />
        <i></i>
      </li>
      <li>
        <label>性别</label>
        <cite>
          <input name="gender" type="radio" value="男" checked="checked" />男    
          <input name="gender" type="radio" value="女" />女
        </cite>
      </li>
      <li>
        <label>生日</label>
        <input id="birth" name="birthday" type="text" class="dfinput" placeholder="格式:yyyy-mm-dd"/>
        <i id = "birthTip"></i>
      </li>
      <li>
        <label>手机号码</label>
        <input id="phone" name="telephone" type="text" class="dfinput" />
        <i id = "phoneTip"></i>
      </li>
      <li>
        <label>邮箱</label>
        <input id="email" name="email" type="text" class="dfinput" />
        <i id = "emailTip"></i>
      </li>
      <li>
        <label>地址</label>
        <input name="address" type="text" class="dfinput" />
        <i id = "addressTip"></i>
      </li>
      <li>
        <label>所属部门</label>
        <select id="dept" class="dfinput" name="dept">
          
        </select>
      </li>
      <li>
        <label>入职时间</label>
        <input id="entrytime" name="entrytime" type="text" class="dfinput" placeholder="格式:yyyy-mm-dd" />
        <i id = "timeTip"></i>
      </li>
      <li>
        <label>员工状态</label>
        <select id="empstate" class="dfinput" name="empstate">
        </select>
      </li>
      <li>
        <label>直属上级</label>
        <input id="superior" name="superior" type="text" class="dfinput" placeholder="直属上级员工id" />
        <i id = "superTip"></i>
      </li>
      <li>
        <label>职务</label>
        <select id="dutyid" class="dfinput" name="dutyid">
        </select>
      </li>
      <li>
        <label>角色权限</label>
        <select id="authority" class="dfinput" name="authority">
        </select>
      </li>
      <li>
        <label> </label>
        <input id="savebtn" type="submit" class="btn" value="确认保存"/>
      </li>
    </ul>
  </p>
</form>

Triggered when a submission is written in the external link js file The event

$('form').submit(function(){
//当密码为空的时候自动赋值
  var pwd = $('#pwd').val();
  if(pwd==null || pwd == ''){
    $('#pwd').val('123456');
  }
  var data = $('form').serialize();
//表单序列化后返回一个字符串 如：account=123&password=1234&sex=&dept=2
  var array = data.split('&');
//把字符串按&号分隔成数组 得到 {account=123,password=1234,sex=,dept=2} 字符串数组
  for(var i = 0;i < array.length; i++){
    var kwarr = array[i].split(&#39;=&#39;);
//循环将数组中的每个子元素字符串用=号分隔成数组 {account,123} {sex,} 然后判断索引为1的子元素是否存在或为‘&#39; 从而达到了表单判空的目的
    if(kwarr[1]===null || kwarr[1] ===&#39;&#39;){
      alert(&#39;除密码外不能存在空值&#39;);
      return false;
    }
  }
});

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