A form that instantly checks whether the format is correct based on jquery

A form that instantly checks whether the format is correct based on jquery_jquery

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Release： 2016-05-16 15:01:56

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Nowadays, the registration modules of many websites can instantly check whether the format is correct, which greatly enhances the user experience and is very beneficial to development.

The following code uses jquery to implement instant inspection of a form field format (including field length, email format), and at the same time, when submitting, the check event is triggered again.

Note that this check is mainly based on keyup and focus. These two events are used to trigger the blur (loss of focus) event.

<html>
<head>
 <meta charset="utf-8" />
 <title></title>
 <link href="css/style.css" rel="stylesheet" type="text/css" />
 <script src="jquery-1.3.2.min.js"></script>
 <script>
  $(function () {
　　　　　　　　//为每个必填字段后面加上*
   $("form :input.required").each(function () {
    var $required = $("<strong class='high'>*</strong>");
    $(this).parent().append($required);
   });
　　　　　　　　//textbox失去焦点事件
   $("form :input").blur(function () {
    var $parent = $(this).parent();
    $parent.find(".formtips").remove();
    if ($(this).is('#username')) {
     if (this.value == "" || this.value.length < 6) {
      var errorMsg = "请输入至少6位的用户名";
      $parent.append('<span class="formtips onError">' + errorMsg + "</span>");
     } else {
      var okMsg = "输入正确"
      $parent.append('<span class="formtips onSuccess">' + okMsg + '</span>');
     }
    }
    if ($(this).is('#email')) {
     if (this.value == "" || (this.value != "" && !/.+@.+\.[a-zA-Z]{2,4}$/.test(this.value))) {
      var errorMsg = "请输入正确的E-Mail地址";
      $parent.append('<span class="formtips onError">' + errorMsg + "</span>");
     } else {
      var okMsg = "输入正确"
      $parent.append('<span class="formtips onSuccess">' + okMsg + '</span>');
     }
    }
   }).keyup(function () {
    $(this).triggerHandler("blur");//keyup和focus利用triggerHandler来触发blur事件
   }).focus(function () {
    $(this).triggerHandler("blur");
   });
   $("#send").click(function () {//提交按钮事件
    $("form .required:input").trigger('blur');
    var numError = $('form .onError').length;
    if(numError)
    {
     return false;
    }
    alert("注册成功，密码已发到你的邮箱，请查收");
   });
  });

 </script>
</head>
<body>
 <form method="post" action="">
  <div class="int">
   <label for="username">用户名</label>
   <input type="text" id="username" class="required" />
  </div>
  <div class="int">
   <label for="email">邮箱</label>
   <input type="text" id="email" class="required" />
  </div>
  <div class="int">
   <label for="=personinfo">个人资料</label>
   <input type="text" id="personinfo" />
  </div>
  <div class="sub">
   <input type="submit" value="提交" id="send" />
   <input type="reset" id="res" />
  </div>
 </form>
</body>
</html>

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Click for more content: Jquery form validation encyclopedia

The above is the entire content of this article. I hope it will be helpful to everyone in learning jquery programming.