jQuery validation plug-in validation usage guide_jquery

During the website development process, sometimes we need to verify whether the information entered by the user meets our requirements, so we will verify the data submitted by the user. Verification is performed twice, once on the client side and once on the server side. Client-side verification can improve the user experience.

There are many jquery validation plug-ins, and they implement basically the same functions. This article introduces only jquery.validate

, one of the jquery validation plug-ins.

jquery.Validation is an excellent jquery plug-in that can validate client forms and provides many customizable properties and methods with good scalability.

1.jquery.validate plug-in function

Easy implementation of client information verification and filtering of information that does not meet requirements

2.jquery.validate official address

Official address: http://jqueryvalidation.org/, with detailed plug-in usage instructions

Official demo: http://jquery.bassistance.de/validate/demo/

3. How to use jquery.validate

1. Quote js

<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.validate.js"></script>

2.css style, customizable, simply add error style, or use the style in the official demo.

.error{
  color:red;
  margin-left:8px;
}

3.js code

$(document).ready(function() {
  // validate signup form on keyup and submit
  var validator = $("#signupform").validate({
    rules: {
      firstname: "required",
      username: {
        required: true,
        minlength: 2
      },
      password: {
        required: true,
        minlength: 5
      },
      password_confirm: {
        required: true,
        minlength: 5,
        equalTo: "#password"
      },
      email: {
        required: true,
        email: true,
      },
      dateformat: "required",
      terms: "required"
    },
    messages: {
      firstname: "姓名不能为空",
      username: {
        required: "用户名不能为空",
        minlength: jQuery.format("用户名只少由 {0} 字符组成")
      },
      password: {
        required: "密码不能为空",
        minlength: jQuery.format("密码只少由 {0} 字符组成")
      },
      password_confirm: {
        required: "确认密码不能为空",
        minlength: jQuery.format("确认密码只少由 {0} 字符组成"),
        equalTo: "秘密与确认密码不一致"
      },
      email: {
        required: "邮箱不能为空",
        email: "邮箱格式不正确"
      },
      dateformat: "请选择性别",
      terms: " "
    },
    // the errorPlacement has to take the table layout into account
    errorPlacement: function(error, element) {
      if ( element.is(":radio") )
        error.appendTo( element.parent().next().next());
      else if ( element.is(":checkbox") )
        error.appendTo ( element.next());
      else
        error.appendTo( element.parent().next());
    },
    // specifying a submitHandler prevents the default submit, good for the demo
    submitHandler: function() {
      alert("submitted!");
    },
    // set this class to error-labels to indicate valid fields
    success: function(label) {
      // set   as text for IE
      label.html(" ").addClass("checked");
    },
    highlight: function(element, errorClass) {
      $(element).parent().next().find("." + errorClass).removeClass("checked");
    }
  });
});

The above code only uses the properties and methods provided by the plug-in. You can also customize the verification method. Such as

$.validator.addMethod("checkUserName", function(value) {

    //value为验证的值，对应于元素id

  //方法代码

}, '用户名格式不正确');

Using custom methods is also very simple, just element id: "checkUserName"

4. HTML used

<form id="signupform" autocomplete="off" method="get" action="">
   <table>
   <tr>
    <td class="label"><label id="lfirstname" for="firstname">姓名</label></td>
    <td class="field"><input id="firstname" name="firstname" type="text" value="" maxlength="100" /></td>
    <td class="status"></td>
   </tr>
   <tr>
    <td class="label"><label id="lusername" for="username">用户名</label></td>
    <td class="field"><input id="username" name="username" type="text" value="" maxlength="50" /></td>
    <td class="status"></td>
   </tr>
   <tr>
    <td class="label"><label id="lpassword" for="password">密码</label></td>
    <td class="field"><input id="password" name="password" type="password" maxlength="50" value="" /></td>
    <td class="status"></td>
   </tr>
   <tr>
    <td class="label"><label id="lpassword_confirm" for="password_confirm">确认密码</label></td>
    <td class="field"><input id="password_confirm" name="password_confirm" type="password" maxlength="50" value="" /></td>
    <td class="status"></td>
   </tr>
   <tr>
    <td class="label"><label id="lemail" for="email">邮箱</label></td>
    <td class="field"><input id="email" name="email" type="text" value="" maxlength="150" /></td>
    <td class="status"></td>
   </tr>
         <tr>
    <td class="label"><label>性别</label></td>
    <td class="field" colspan="2" style="vertical-align: top; padding-top: 2px;">
    <table>
    <tbody>

    <tr>
      <td style="padding-right: 5px;">
        <input id="sex_men" name="dateformat" type="radio" value="0" />
        <label id="lbl_sex_men" for="dateformat_eu">男</label>
      </td>
      <td style="padding-left: 5px;">
        <input id="sex_women" name="dateformat" type="radio" value="1" />
        <label id="lbl_sex_women" for="dateformat_am">女</label>
      </td>
      <td>
      </td>
    </tr>
    </tbody>
    </table>
    </td>
   </tr>

   <tr>
    <td class="label"> </td>
    <td class="field" colspan="2">
      <div id="termswrap">
        <input id="terms" type="checkbox" name="terms" />
        <label id="lterms" for="terms">以阅读并同意网站条款.</label>
      </div> <!-- /termswrap -->
    </td>
   </tr>
   <tr>
    <td class="label"></td>
    <td class="field" colspan="2">
    <input id="signupsubmit" name="signup" type="submit" value="注册" />
    </td>
   </tr>

   </table>
</form>

For more applications of validation methods, please see http://jqueryvalidation.org/