3 ways to use jquery form validation plug-in (jquery.validate.js)

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3 ways to use jquery form validation plug-in (jquery.validate.js)_jquery

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May 16, 2016 pm 04:07 PM

jquery

jquery verification is very simple. Here is a summary of the three commonly used methods:

The first method: also a relatively standard method:

First introduce the jquery plug-in and jquery verification plug-in:

Step 1: Introduce the plug-in

Copy code The code is as follows:

Step 2: Define the error output of the form:

Copy code The code is as follows:

Step 3: Add error handling method;

jquery verification requires:

1: Define verification method
2: Add verification rules

Commonly used verification examples are posted below, which will be easy to understand at a glance.

Look at the renderings first:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<script type="text/javascript" src="js/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="js/jquery.validate.js"></script>
<script type="text/javascript" src="js/jquery.metadata.js"></script>
<script type="text/javascript" src="js/messages_zh.js"></script>
<style type="text/css">
	#frm label.error {
		color: Red;
	}
</style>
</head>
<script type="text/javascript">

$(document).ready(function(){
  $("#clickme").click(function(){
     alert("Hello World");
 });
 
 
 
  $( "#frm" ).validate({
      rules: {
          username: {
              required: true,
              minlength: 4,
              maxlength: 20,
              byteMaxLength:20,
              valiEnglish:true
          },
          postcode: {
          	 postcodeVal:true
          	},
          number: {
          	byteMaxLength:5,
          	numFormat:5
          	},
          	identifier: {
          	sfzhValidate:true	
          }
          	
          	
          
      },
      messages: {
          username: {
              required: "请输入用户名4--20个英文字符",
              minlength: $.format("Keep typing, at least {0} characters required!"),
              maxlength: $.format("Whoa! Maximum {0} characters allowed!")
          },
          number: {
          	  numFormat: $.format("请输入{0}数字")
          	}
      }
  });
 
 
 
 jQuery.validator.addMethod("byteMaxLength", function(value,
					element, param) {
				var length = value.length;
				for ( var i = 0; i < value.length; i++) {
					if (value.charCodeAt(i) > 127) {
						length++;
					}
				}
				return this.optional(element) || (length <= param);
			}, $.validator.format("不能超过{0}个字节(一个中文字算2个字节)"));
 
 jQuery.validator.addMethod("numFormat",function(value,element,param){
			 return this.optional(element) || /^\d*$/.test(value);
			}
			//,$.validator.format("请输入数字{0}位以内")
			);
			
			
			 
			//number(9,3)
			jQuery.validator.addMethod("numFormat63",function(value,element){
			 return this.optional(element) || /^[0-9]{1,6}(\.\d{1,3})$/.test(value);
			},$.validator.format("请输入合法数字,精度格式123456.0")
			);
			
			
			jQuery.validator.addMethod("postcodeVal",function(value,element){
			 return this.optional(element) || /^[0-9]\d{5}(&#63;!\d)$/.test(value);
			},$.validator.format("请输入合法的邮编")
			);
			
			jQuery.validator.addMethod("numberAndLettersVal",function(value,element){
			 return this.optional(element) || /^[a-zA-Z0-9]+$/.test(value);
			},$.validator.format("请输入字母或数字")
			);
			
			
			
			jQuery.validator.addMethod("sfzhValidate",function(value,element){
			 return this.optional(element) || /^(\d{14}|\d{17})(\d|[xX])$/.test(value);
			},$.validator.format("请输入合法身份证号")
			);
			
			
			
			jQuery.validator.addMethod("valiEnglish",function(value,element){
			 return this.optional(element) || /^[a-zA-Z ]*$/.test(value);
			},$.validator.format("请输入字母或者空格")
			);
		

});


</script>
<body>
<form id="frm" name="frm" method="post" action=""><label>用 户 名:
  <input type="text" name="username" id="username" />
</label>
 <p>
  <label>邮    编 :<label></label></label>
  <label>
  <input type="text" name="postcode" id="postcode" />
  <br />
  </label>
 </p>
 <p><label>数   字 : 
  <input type="text" name="number" id="number" />
 </label>
  <br /><label>身份证号：
  <input type="text" name="identifier" id="identifier" />
  </label>
   
 <label>
 <input type="button" name="clickme" id="clickme" value="click me" />
 </label>
 </p>
</form>
</body>
</html>

This is a complete verification example. The introduced code has been uploaded and can be click to download
The key methods are explained below:

 jQuery.validator.addMethod("byteMaxLength", function(value,
					element, param) {
				var length = value.length;
				for ( var i = 0; i < value.length; i++) {
					if (value.charCodeAt(i) > 127) {
						length++;
					}
				}
				return this.optional(element) || (length <= param);
			}, $.validator.format("不能超过{0}个字节(一个中文字算2个字节)"));

jQuery.validator.addMethod() method has three parameters,
The first parameter: "byteMaxLength" is to define the method name. The method name must be unique and is an identifier flag.
The second parameter: is the following callback function:

function(value,	element, param) {
				var length = value.length;
				for ( var i = 0; i < value.length; i++) {
					if (value.charCodeAt(i) > 127) {
						length++;
					}
				}
				return this.optional(element) || (length <= param);
			}

The callback function has three parameters:

The first one: value, is the value of the currently verified element.
The second one: element is the element currently being validated.
The third one: is the incoming parameter, for example: min: 5 This parameter is 5. When this method is called, for example: byteMaxLength: 10 where 10 is the incoming parameter.

The method name of this method is: byteMaxLength The callback function is as above,
The function of the callback function is to verify how many bytes are entered. One Chinese character represents two characters, and the characters are ASCII codes 0-127. One of the sentences returns:
return this.optional(element) The meaning of this function call is: used to verify when the form input value is not empty. When the field is empty, that is, the value of element is empty, this.optional(element) = true, which means that the filed is not a required item, and it will pass verification even if it is not filled in. If the value of element is not empty, this.optional(element) = false, the purpose of returning true or false will be judged based on the verification behind ||. To sum up, this .optional(element) is to illustrate that the currently verified field is not required.

The third parameter: as follows:

Copy code The code is as follows:

$.validator.format("Cannot exceed {0} bytes (one Chinese character counts as 2 bytes)") 

This third parameter can be directly a message, which is the verification prompt information. In order to display the verification information of the function, this parameter can also be displayed by creating the function jQuery.validator.format(value), where {0} represents If the parameters of this method are called like: byteMaxLength: 10, the above input cannot exceed 10 bytes, (one Chinese character counts as two bytes)

Look at this code below:

  $( "#frm" ).validate({
      rules: {
          username: {
              required: true,
              minlength: 4,
              maxlength: 20,
              byteMaxLength:20,
              valiEnglish:true
          },
          postcode: {
          	 postcodeVal:true
          	},
          number: {
          	byteMaxLength:5,
          	numFormat:5
          	},
          	identifier: {
          	sfzhValidate:true	
          }
          	
          	
          
      },
      messages: {
          username: {
              required: "请输入用户名4--20个英文字符",
              minlength: $.format("Keep typing, at least {0} characters required!"),
              maxlength: $.format("Whoa! Maximum {0} characters allowed!")
          },
          number: {
          	  numFormat: $.format("请输入{0}数字")
          	}
      }
  });

First of all, this is a method call

Copy code The code is as follows:

$( "#frm" ).validate([options])

验证选择的表单，方法的参数是可选项，可以输入0个或者键值对（key/value）
这个方法是为了处理例如：submit , focus , keyup , blur, click 触发验证的，对象是整个表单的元素，或者是单个元素，使用rules和 messages 定义验证的元素，使用errorClass, errorElement, wrapper, errorLabelContainer, errorContainer, showErrors, success, errorPlacement, highlight, unhighlight, and ignoreTitle去控制非法元素的错误信息显示。

下面看 validate 的方法 rules();

返回第一个选择的元素的验证的规则，有若干种方式定义验证规则。

rules 方法定义了基于id的验证，

复制代码代码如下:

  username: {

                           required: true,

                           minlength: 4,

                           maxlength: 20,

                           byteMaxLength:20,

                           valiEnglish:true

                   }

如上：其中，username为 id名， {}中为定义的验证方法，就是这个id 的都需要哪些方法验证，方法名就是上面讲到的方法；

这样就定义了。

messages中定义了：

复制代码代码如下:

  username: {

                           required: "请输入用户名4--20个英文字符",

                           minlength: $.format("Keep typing, at least {0} characters required!"),

                           maxlength: $.format("Whoa! Maximum {0} characters allowed!")

                   }

这个id中方法验证错误提示信息。其中可以直接输出message或者调用 $.format()方法。

上面的标准格式就是：

复制代码代码如下:

var $params = {debug:false, rules:{}, messages:{}};

 $("#frm").validate($params);

rules{}中定义验证规则的方法。 messages{}定义错误输出。
以上为第一种方式：

第二种方式：和第一种基本差不多：














用 户 名:
  

 
  邮    编 :
  
  
  

  
 
 数   字 : 
  
 
  
身份证号：

以上为第二种方式的代码：其中：
方法定义和第一种一样：在于调用：

复制代码代码如下:

function check_infor(){

  $("#username").attr("class","{byteMaxLength:22,valiEnglish:true}");

   $("#postcode").attr("class","{byteMaxLength:6,postcodeVal:true}");

    $("#number").attr("class","{byteMaxLength:6,numFormat:6}");

    $("#identifier").attr("class","{sfzhValidate:true}");

 }

其中定义了一个javascript方法专门用于为form表单中需要验证的id进行验证：
其中用到了.attr() 方法：这个方法有很多种参数形式 .attr(attributeName,value)方法
attributeName为参数名： value 为参数值
其中下面means 是为 id为username的元素的 class 属性添加值：

复制代码代码如下:

"{byteMaxLength:22,valiEnglish:true}"

复制代码代码如下:

$("#username").attr("class","{byteMaxLength:22,valiEnglish:true}");

这样该id元素就有了验证。

注意：在自定义的check_infor()调用之前，必须首先调用$("#frm").valudate();方法；

第三种方式：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<script type="text/javascript" src="js/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="js/jquery.validate.js"></script>
<script type="text/javascript" src="js/jquery.metadata.js"></script>
<script type="text/javascript" src="js/messages_zh.js"></script>
<style type="text/css">
	#frm label.error {
		color: Red;
	}
</style>
</head>
<script type="text/javascript">

$(document).ready(function(){
  $("#clickme").click(function(){
     alert("Hello World");
 });
  
  jQuery.validator.addMethod("byteMaxLength", function(value,
					element, param) {
				var length = value.length;
				for ( var i = 0; i < value.length; i++) {
					if (value.charCodeAt(i) > 127) {
						length++;
					}
				}
				return this.optional(element) || (length <= param);
			}, $.validator.format("不能超过{0}个字节(一个中文字算2个字节)"));
 
  jQuery.validator.addMethod("numFormat",function(value,element,param){
			 return this.optional(element) || /^\d*$/.test(value);
			},$.validator.format("请输入数字{0}位以内")
			);
			
			
			 
			//number(9,3)
			jQuery.validator.addMethod("numFormat63",function(value,element){
			 return this.optional(element) || /^[0-9]{1,6}(\.\d{1,3})$/.test(value);
			},$.validator.format("请输入合法数字,精度格式123456.0")
			);
			
			
			jQuery.validator.addMethod("postcodeVal",function(value,element){
			 return this.optional(element) || /^[0-9]\d{5}(&#63;!\d)$/.test(value);
			},$.validator.format("请输入合法的邮编")
			);
			
			jQuery.validator.addMethod("numberAndLettersVal",function(value,element){
			 return this.optional(element) || /^[a-zA-Z0-9]+$/.test(value);
			},$.validator.format("请输入字母或数字")
			);
			
			
			
			jQuery.validator.addMethod("sfzhValidate",function(value,element){
			 return this.optional(element) || /^(\d{14}|\d{17})(\d|[xX])$/.test(value);
			},$.validator.format("请输入合法身份证号")
			);
			
			
			
			jQuery.validator.addMethod("valiEnglish",function(value,element){
			 return this.optional(element) || /^[a-zA-Z ]*$/.test(value);
			},$.validator.format("请输入字母或者空格")
			);
			
	 	$("#frm").validate();
		$('#username').rules('add', { required: true, byteMaxLength:20,valiEnglish:true});
        $('#postcode').rules('add', { postcodeVal:true});
        $('#number').rules('add', { byteMaxLength:5,numFormat:5});
        $('#identifier').rules('add', { sfzhValidate:true});
 
		
});




</script>
<body>
<form id="frm" name="frm" method="post" action=""><label>用 户 名:
  <input type="text" name="username" id="username" />
</label>
 <p>
  <label>邮    编 :<label></label></label>
  <label>
  <input type="text" name="postcode" id="postcode" />
  <br />
  </label>
 </p>
 <p><label>数   字 : 
  <input type="text" name="number" id="number" />
 </label>
  <br /><label>身份证号：
  <input type="text" name="identifier" id="identifier" />
  </label>
   
 <label>
 <input type="button" name="clickme" id="clickme" value="click me" />
 </label>
 </p>
</form>
</body>
</html>

第三种方式与其他两种方式不同的地方就是：

复制代码代码如下:

                $('#username').rules('add', { required: true,  byteMaxLength:20,valiEnglish:true});

                $('#postcode').rules('add', { postcodeVal:true});

                $('#number').rules('add', { byteMaxLength:5,numFormat:5});

                $('#identifier').rules('add', { sfzhValidate:true});

为每一个单独的元素添加验证规则。其中调用了rules( "add", rules )方法：
增加验证规则为匹配的元素。
注意：$("form").validate()方法必须首先被调用。
这个规则也能包含一个messages-object，定义常用的messages。

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