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jQuery Validation是一个用于验证表单的jQuery插件,简单易用,已经包含了16种内置的验证规则.Github上也有更多的验证规则可以使用.这都不是重点,重点是你可以轻松的定制自己的规则.
内置规则:
- required – Makes the element required.
- remote – Requests a resource to check the element for validity.
- minlength – Makes the element require a given minimum length.
- maxlength – Makes the element require a given maximum length.
- rangelength – Makes the element require a given value range.
- min – Makes the element require a given minimum.
- max – Makes the element require a given maximum.
- range – Makes the element require a given value range.
- step – Makes the element require a given step.
- email – Makes the element require a valid email
- url – Makes the element require a valid url
- date – Makes the element require a date.
- dateISO – Makes the element require an ISO date.
- number – Makes the element require a decimal number.
- digits – Makes the element require digits only.
- equalTo – Requires the element to be the same as another one
内置规则的使用
内置规则的使用非常简单:
首先将该插件的js文件包含进html文件:
然后用jQuery选择需要验证的表单,执行validate()函数即可:
jQuery Validation官网上的例子:
jQuery Validation会根据表单设置的type和属性自动为他们分配内置的规则,比如email,url,required等.
运行一下看看:
什么都不输入,直接点提交:
添加自定义规则
jQuery Validation最吸引人的feature,它可以轻松的加入自定义的规则:
第一步,在js中调用jQuery.validator.addMethod函数来添加规则,例如添加IP格式检查的规则:
$.validator.addMethod( "ipv4", function( value, element ) {return this.optional( element ) || /^(25[0-5]|2[0-4]\d|[01]?\d\d?)\.(25[0-5]|2[0-4]\d|[01]?\d\d?)\.(25[0-5]|2[0-4]\d|[01]?\d\d?)\.(25[0-5]|2[0-4]\d|[01]?\d\d?)$/i.test( value );}, "Invalid IP v4 address." ); //自定义其他规则只需要替换规则名"ipv4",正则表达式//之间的内容,以及出错后显示的字符串"Invalid IP v4 address."即可.
第二步,把规则应用到指定的表单项,即在执行$("#form_id").validate()函数的时候加入rules参数:
23 $("#ip_form").validate({
24 rules: {
25 ip: {
26 required: true,
27 ipv4: true,
28 },
29 netmask: {
30 required: true,
31 ipv4: true,
32 },
33 gateway: {
34 required: true,
35 ipv4: true,
36 },
37 },
38 }); //其中ip,netmask,gateway为表单项的name属性.required和ipv4是规则名.
生效后的样子,可以添加如下css来修改错误信息的样式:
label.error {
margin-left: 10px;
padding-left: 5px;
padding-right: 5px;
color: #E2303A;
font-style: italic;
font: Helvetica Neue, 12px, #E2303A;
border: 1px solid #F2A9AE;
}
使用json提交数据
表单验证通过后,提交动作默认是使用form本身的提交动作,即指定form的action和method属性:
method="get" action=""
可以在validate()函数中添加submitHandler参数来指定点击提交后执行的函数,我们可以在该函数中使用$.json来提交数据:
23 $("#ip_form").validate({
24 rules: {
25 ip: {
26 required: true,
27 ipv4: true,
28 },
29 netmask: {
30 required: true,
31 ipv4: true,
32 },
33 gateway: {
34 required: true,
35 ipv4: true,
36 },
37 dns: {
38 dns: true,
39 }
40 },
41 submitHandler: function(form) {
42 ip_ok();
43 $("#ip-conf").modal('hide');
44 }
45 });
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