Detailed explanation of jQuery validation plug-in Validate

validate is a good jq plug-in that provides powerful validation functions, making client form validation easier. It also provides a large number of customization options to meet various application needs. The plugin bundles a set of useful validation methods, including URL and email validation, and provides an API for writing user-defined methods.

The most common occasion for using JavaScript is form validation, and jQuery, as an excellent JavaScript library, also provides an excellent form validation plug-in----Validation. Validation is one of the oldest jQuery plug-ins, has been verified by different projects around the world, and has been praised by many web developers. As a standard verification method library, Validation has the following characteristics:

1. Built-in validation rules: It has 19 types of built-in validation rules such as required, numbers, emails, URLs and credit card numbers
2. Customization Verification rules: Verification rules can be easily customized
3. Simple and powerful verification information prompts: Verification information prompts are provided by default, and the function of customizing the default prompt information is provided
4. Real-time verification: Possible to pass The keyup or blur event triggers validation, not just when the form is submitted

validate.js download address: http://plugins.jquery.com/project/validate
metadata.js download address: http://plugins.jquery.com/project/metadata Usage:

1. Introduce the jQuery library and Validation plug-in

The code is as follows :

<script src="scripts/jquery-1.6.4.js" type="text/javascript"></script>  
<script src="scripts/jquery.validate.js" type="text/javascript"></script>

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2. Determine which form needs to be verified

The code is as follows:

<script type="text/javascript">  
////<![CDATA[  
$(document).ready(function(){  
    $("#commentForm").validate();  
});  
//]]>  
</script>

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3. Code verification rules for different fields and set the corresponding attributes of the fields

The code is as follows:

class="required"   必须填写  
class="required email"        必须填写且内容符合Email格式验证  
class="url"             符合URL格式验证  
minlength="2"      最小长度为2  
可验证的规则有19种：
[javascript] view plaincopyprint?
required:      必选字段  
remote:        "请修正该字段",  
email:         电子邮件验证  
url:           网址验证  
date:          日期验证  
dateISO:       日期 (ISO)验证  
dateDE:  
number:        数字验证  
numberDE:  
digits:        只能输入整数  
creditcard:    信用卡号验证  
equalTo:       ”请再次输入相同的值“验证  
accept:        拥有合法后缀名的字符串验证  
maxlength/minlength:    最大/最小长度验证  
rangelength:     字符串长度范围验证  
range:           数字范围验证  
max/min:         最大值/最小值验证

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needs to be introduced The js

code is as follows:

<script type="text/javascript" src="../../scripts/jquery-1.3.1.js"></script>
<script type="text/javascript" src="lib/jquery.validate.js"></script>

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The initialized HTML

code is as follows:

<script type="text/javascript">
$(function(){
　$("#commentForm").validate() 
})
</script>
<form class="cmxform" id="commentForm" method="get" action="">
 <fieldset>
   <legend>一个简单的validate验证带验证提示的评论例子</legend>
   <p>
     <label for="cusername">姓名</label>
     <em>*</em><input id="cusername" name="username" size="25" class="required" minlength="2" />
   </p>
   <p>
     <label for="cemail">电子邮件</label>
     <em>*</em><input id="cemail" name="email" size="25" class="required email"  />
   </p>
   <p>
     <label for="curl">网址</label>
     <em>  </em><input id="curl" name="url" size="25" class="url" />
   </p>
   <p>
     <label for="ccomment">你的评论</label>
     <em>*</em><textarea id="ccomment" name="comment" cols="22" class="required" ></textarea>
   </p>
 <p>
     <input class="submit" type="submit" value="提交"/>
   </p>

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First look at the specifications of the default settings

Serial number

序号	规则	描述
1	required:true	必须输入的字段。
2	remote:"check.php"	使用 ajax 方法调用 check.php 验证输入值。
3	email:true	必须输入正确格式的电子邮件。
4	url:true	必须输入正确格式的网址。
5	date:true	必须输入正确格式的日期。日期校验 ie6 出错，慎用。
6	dateISO:true	必须输入正确格式的日期（ISO），例如：2009-06-23，1998/01/22。只验证格式，不验证有效性。
7	number:true	必须输入合法的数字（负数，小数）。
8	digits:true	必须输入整数。
9	creditcard:	必须输入合法的信用卡号。
10	equalTo:"#field"	输入值必须和 #field 相同。
11	accept:	输入拥有合法后缀名的字符串（上传文件的后缀）。
12	maxlength:5	输入长度最多是 5 的字符串（汉字算一个字符）。
13	minlength:10	输入长度最小是 10 的字符串（汉字算一个字符）。
14	rangelength:[5,10]	输入长度必须介于 5 和 10 之间的字符串（汉字算一个字符）。
15	range:[5,10]	输入值必须介于 5 和 10 之间。
16	max:5	输入值不能大于 5。
17	min:10	输入值不能小于 10。

Rule<🎜>

Description<🎜>

required:true

A field that must be entered.

remote:"check.php"

Use the ajax method to call check.php to verify the input value.

email:true

You must enter a correctly formatted email.

url:true

You must enter the URL in the correct format.

date:true

A date in the correct format must be entered. Date verification ie6 error, use with caution.

dateISO:true

You must enter the date (ISO) in the correct format, for example: 2009-06-23, 1998/01/22. Only the format is verified, not the validity.

number:true

Legal numbers (negative numbers, decimals) must be entered.

digits:true

An integer must be entered.

creditcard:

A valid credit card number must be entered.

equalTo:"#field"

The input value must be the same as #field.

accept:

Enter a string with a legal suffix (the suffix of the uploaded file).

maxlength:5

Enter a string with a maximum length of 5 (Chinese characters count as one character).

minlength:10

Enter a string with a minimum length of 10 (Chinese characters count as one character).

rangelength:[5,10]

The input length must be between 5 and 10 ( Chinese characters count as one character).

range:[5,10]

The input value must be between 5 and 10.

max:5

The input value cannot be greater than 5.

min:10

The input value cannot be less than 10.

required表示必须填写的

email表示必须正确的邮箱

把验证的规格写在HTML内的class内，方法欠妥，后期的维护增加成本，没有实现行为与结构的分离

所以，可以想把HTML内的class都清空，如下:

代码如下:

<form class="cmxform" id="commentForm" method="get" action="">
 <fieldset>
   <legend>一个简单的validate验证带验证提示的评论例子</legend>
   <p>
     <label for="cusername">姓名</label>
     <em>*</em><input id="cusername" name="username" size="25" />
   </p>
   <p>
     <label for="cemail">电子邮件</label>
     <em>*</em><input id="cemail" name="email" size="25"  />
   </p>
   <p>
     <label for="curl">网址</label>
     <em>  </em><input id="curl" name="url" size="25" />
   </p>
   <p>
     <label for="ccomment">你的评论</label>
     <em>*</em><textarea id="ccomment" name="comment" cols="22" ></textarea>
   </p>
 <p>
     <input class="submit" type="submit" value="提交"/>
   </p>

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代码如下:

 $(document).ready(function(){
    $("#commentForm").validate({
      rules:{
        username:{
          required:true,
          minlength:2
        },
        email:{
          required:true,
          email:true
        },
        url:"url",
        comment:"required",
        valcode: {
          formula: "7+9"  
        }
      }
    });
  });
  </script>

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因为默认的提示是英文的，可以改写成

代码如下:

jQuery.extend(jQuery.validator.messages, {
        required: "必选字段",
        remote: "请修正该字段",
        email: "请输入正确格式的电子邮件",
        url: "请输入合法的网址",
        date: "请输入合法的日期",
        dateISO: "请输入合法的日期 (ISO).",
        number: "请输入合法的数字",
        digits: "只能输入整数",
        creditcard: "请输入合法的信用卡号",
        equalTo: "请再次输入相同的值",
        accept: "请输入拥有合法后缀名的字符串",
        maxlength: jQuery.format("请输入一个长度最多是 {0} 的字符串"),
        minlength: jQuery.format("请输入一个长度最少是 {0} 的字符串"),
        rangelength: jQuery.format("请输入一个长度介于 {0} 和 {1} 之间的字符串"),
        range: jQuery.format("请输入一个介于 {0} 和 {1} 之间的值"),
        max: jQuery.format("请输入一个最大为 {0} 的值"),
        min: jQuery.format("请输入一个最小为 {0} 的值")
});

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建议新建一个js,放到validate.js 下面.

关于提示的美化

代码如下:

errorElement:"em"

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　　创建一个标签，可以自定义

代码如下:

success:function(label){
        label.text(" ").addClass(&#39;success&#39;)
      }

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这里的参数label是指向创建的标签，这里也就是”em“ 然后情况自己的内容，在加上自己的class就可以了

完整的js

代码如下:

  $("#commentForm").validate({
      rules:{
        username:{
          required:true,
          minlength:2
        },
        email:{
          required:true,
          email:true
        },
        url:"url",
        comment:"required",
      },
      errorElement:"em",
      success:function(label){
        label.text(" ").addClass(&#39;success&#39;)
      }
    });

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相对应的css

代码如下:

em.error {
  background:url("images/unchecked.gif") no-repeat 0px 0px;
  padding-left: 16px;
}
em.success {
  background:url("images/checked.gif") no-repeat 0px 0px;
  padding-left: 16px;
}

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.success放到.error下面。。。唔唔。。具体的情况。。只可体会不可言会。。唔。。

在做项目的过程中千变万化，有时候要满足不同的需求，validate也可以单独的修改验证的信息。。

例如：

代码如下:

  messages:{
        username:{
          required:"主人,我要填的满满的",
          minlength:"哎唷,长度不够耶"
        }
   }

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完整的js

代码如下:

 $("#commentForm").validate({
      rules:{
        username:{
          required:true,
          minlength:2
        },
        email:{
          required:true,
          email:true
        },
        url:"url",
        comment:"required",
        valcode: {
          formula: "7+9"  
        }
      },
      messages:{
        username:{
          required:"主人,我要填的满满的",
          minlength:"哎唷,长度不够耶"
        }
      },
      errorElement:"em",
      success:function(label){
        label.text(" ").addClass(&#39;success&#39;)
      }
    });

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这里就可以啦。

关于自定义验证规则

增加一段HTML代码

代码如下:

 <p>
     <label for="cvalcode">验证码</label>
     <input id="valcode" name="valcode"  />=7+9
   </p>

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自定一个规则

代码如下:

$.validator.addMethod("formula",function(value,element,param){
      return value==eval(param)
    },"请正确输入验证信息");

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formula是需要验证方法的名字好比如required 必须的。
value返回的当前input的value值
param返回的是当前自定义的验证格式好比如：7+9
在试用了eval方法让字符串相加

完整的js

代码如下:

$.validator.addMethod("formula",function(value,element,param){
      return value==eval(param)
    },"请正确输入验证信息");
    $("#commentForm").validate({
      rules:{
        username:{
          required:true,
          minlength:2
        },
        email:{
          required:true,
          email:true
        },
        url:"url",
        comment:"required",
        valcode: {
          formula: "7+9"  
        }
      },
      messages:{
        username:{
          required:"主人,我要填的满满的",
          minlength:"哎唷,长度不够耶"
        }
      },
      errorElement:"em",
      success:function(label){
        label.text(" ").addClass(&#39;success&#39;)
      }
    });

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完

Detailed explanation of jQuery validation plug-in Validate_jquery