Learn ajax to implement form verification method when submitting

[Related article recommendations: ajax video tutorial]

The example in this article shares with you the method of verifying the form when submitting ajax, for everyone For reference, the specific content is as follows

Method 1:

Code example:

Ingenious design: If ajax is submitted, verification and interception cannot be performed , set a flag to judge, very clever design, so collect it!

function inserts(){
 var flag = checkForm();
 if (flag == false) {
  return;
 }
 $.ajax({
     //几个参数需要注意一下
       type: "POST",//方法类型
       dataType: "json",//预期服务器返回的数据类型
       url: "<%=path %>/soldier/inserts" ,//url
       data: $(&#39;#form1&#39;).serialize(),
       success: function (data) {
        alert(data.msg);
        window.location.reload(true);
       },
       error : function() {
         alert(data.msg);
       }
     });
 }
 function checkForm(){
 var name = $("#name").val();
 if (name.trim() == &#39;&#39;) {
  alert("请输入姓名！");
  $("#name").focus();
  return false;
 }
 var sex = $("#sex").val();
 if (sex.trim() == &#39;&#39;) {
  alert("请输入性别！");
  $("#sex").focus();
  return false;
 } else if (sex.trim() != &#39;男&#39; && sex.trim() != &#39;女&#39;) {
  alert("请输入合法性别！");
  $("#sex").val(&#39;&#39;);
  $("#sex").focus();
  return false;
 }
 var age = $("#age").val();
 if (age.trim() == &#39;&#39;) {
  alert("请输入年龄！");
  $("#age").focus();
  return false;
 }else if(age.trim()==0 || age.trim()<=0 || age.trim()>150){
  alert("请输入合法年龄！");
  $("#age").focus();
  return false;
 }
 var politics_sstatus = $("#politics_sstatus").val();
 if (politics_sstatus.trim() == &#39;&#39;) {
  alert("请输入政治面貌！");
  $("#politics_sstatus").focus();
  return false;
 }
 var tel = $("#tel").val();
 if (tel.trim() == &#39;&#39;) {
  alert("请输入联系电话！");
  $("#tel").focus();
  return false;
 }else if(tel.length<11 || tel.length>11){
  alert("请输入合法联系电话！");
  $("#tel").focus();
  return false;
 }
 var id_card = $("#id_card").val();
 if (id_card.trim() == &#39;&#39;) {
  alert("请输入身份证号码！");
  $("#id_card").focus();
  return false;
 }else if(id_card.length<18 ||id_card.length>18){
  alert("请输入合法身份证号码！");
  $("#id_card").focus();
  return false;
 }
 var appeal = $("#appeal").val();
 if (appeal.trim() == &#39;&#39;) {
  alert("请输入主要诉求！");
  $("#appeal").focus();
  return false;
 }
 return true;
 }

Page effect:

Method 2:

This is a login ajax verification

Code example:

Submit button on the page:

<input type="button" id="loginsubmit" value="登录" />

js logic:

Analysis: When the user clicks the button At that time, I will

<script type="text/javascript">
 var redirectUrl = "${redirect}";
 var LOGIN = {
  /*
  3、进行账号密码的校验
  */
  checkInput:function() {
  if ($("#loginname").val() == "") {
   alert("用户名不能为空");
   $("#loginname").focus();
   return false;
  }
  if ($("#nloginpwd").val() == "") {
   alert("密码不能为空");
   $("#nloginpwd").focus();
   return false;
  }
  return true;
  },
  /*
  4、进行登录
  1.当账号密码校验不为空的时候进行后台校验
  */
  doLogin:function() {
  $.post("/user/login", $("#formlogin").serialize(),function(data){
   if (data.status == 200) {
   alert("登录成功！");
   if (redirectUrl == "") {
    location.href = "http://localhost:8082";
   } else {
    location.href = redirectUrl;
   }
   } else {
   alert("登录失败，原因是：" + data.msg);
   $("#loginname").select();
   }
  });
  },
  /*
  2、进行登录校验
  */
  login:function() {
  if (this.checkInput()) {
   this.doLogin();
  }
  }
 
 };
 /* 
 1、页面初始化的时候校验表单的数据
  1.当用户点击登录的时候，绑定一个click事件
  2.调用LOGIN对象的login方法，进行账号密码校验
 */ 
 $(function(){
 $("#loginsubmit").click(function(){
  LOGIN.login();
 });
 });
</script>

Rendering:

Related learning recommendations: js video tutorial

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