在前面说到的简单验证中,使用起来非常简单,有些傻瓜式的味道,但毕竟有些内置规则不能使用。但要想做到灵活运用,还是需要通过JS编码来完成。这样不但所有的内置规则可以使用,而且我们还可以自定义验证规则。以下实例我从易到难逐个列出:
1.编写JS的简单方法
仍以登录验证为例:
<script type="text/javascript" language="javascript" src="http://www.cnblogs.com/Scripts/jquery-1.4.1.min.js"></script> <script type="text/javascript" language="javascript" src="http://www.cnblogs.com/Scripts/jquery.validate.min.js"></script> <h2>Validate-High</h2> <form action="" id="loginForm" method="post"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td> <input type="text" id="UserEmail" /> </td> </tr> <tr> <td> <input type="password" id="Password" /> </td> </tr> <tr> <td> <input type="submit" value="submit" /> </td> </tr> </table> </form> <script language="javascript" type="text/javascript"> $(document).ready(function () { var validateOpts = { rules: { UserEmail: { required: true, email: true }, Password: { required: true } }, messages: { UserEmail: { required: "请输入邮箱地址", email: "邮箱地址不正确" }, Password: { required: "请输入密码" } } }; $("#loginForm").validate(validateOpts); }); </script>
我们只需设置validate的参数即可。
2.equalTo的使用,一般在注册时会用到
<script type="text/javascript" language="javascript" src="http://www.cnblogs.com/Scripts/jquery-1.4.1.min.js"></script> <script type="text/javascript" language="javascript" src="http://www.cnblogs.com/Scripts/jquery.validate.min.js"></script> <h2> ValidateHigh</h2> <form action="" id="loginForm" method="post"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td> <input type="text" id="UserEmail" /> </td> </tr> <tr> <td> <input type="password" id="Password" /> </td> </tr> <tr> <td> <input type="password" id="RePassword" /> </td> </tr> <tr> <td> <input type="submit" value="submit" /> </td> </tr> </table> </form> <script language="javascript" type="text/javascript"> $(document).ready(function () { var validateOpts = { rules: { UserEmail: { required: true, email: true }, Password: { required: true }, RePassword: { equalTo: "#Password" } }, messages: { UserEmail: { required: "请输入邮箱地址", email: "邮箱地址不正确" }, Password: { required: "请输入密码" }, RePassword: { equalTo: "两次输入密码必须相同" } } }; $("#loginForm").validate(validateOpts); }); </script>
3.required(dependency-callback)的使用,绿色字体。
var validateOpts = { rules: { age: { required: true, min: 3 }, parent: { required: function (element) { return $("#age").val() < 13; } } } }
4.自定义规则,使用addMethod方法,如下:
//方法接收三个参数(value,element,param)
//value是元素的值,element是元素本身 param是参数,我们可以用addMethod来添加除built-in Validation methods之外的验证方法
//比如有一个字段,只能输一个字母,范围是a-f,写法如下
$.validator.addMethod("af", function (value, element, params) { if (value.length > 1) { return false; } if (value >= params[0] && value <= params[1]) { return true; } else { return false; } }, "必须是一个字母,且a-f");
这样我们就可以在rules中加上这个规则,如下
var validateOpts = { rules: { selectorId: { af: ["a","f"]//如果只有一个参数,直接写,如果af:"a",那么a就是这个唯一的参数,如果多个参数,用在[]里,用逗号分开 } } }
另外,经过试验,在Json方式中,我们可以使用af:['a','f'],这个验证可以起作用,在class方式中,在某个元素上增加af='af',验证也可以起到作用。
5.ajax验证,使用remote
remote: { url:"CheckEmail", type:"post", dataType:"json" }
如果我们验证的方法是返回Boolean类型,这个方法是没有问题的。但很多时候我们可能返回的信息会更多,或者返回其它类型,这时我们可以重新定义一个新的remote方法,示例如下(返回一个Json对象):
$.validator.addMethod("jsonremome", function (value, element, param) { if (this.optional(element)) return "dependency-mismatch"; var previous = this.previousValue(element); if (!this.settings.messages[element.name]) this.settings.messages[element.name] = {}; previous.originalMessage = this.settings.messages[element.name].remote; this.settings.messages[element.name].remote = previous.message; param = typeof param == "string" && { url: param} || param; if (previous.old !== value) { previous.old = value; var validator = this; this.startRequest(element); var data = {}; data[element.name] = value; $.ajax($.extend(true, { url: param, mode: "abort", port: "validate" + element.name, dataType: "json", data: data, success: function (response) { validator.settings.messages[element.name].remote = previous.originalMessage; //var valid = response === true; var valid = response.Result === true; if (valid) { var submitted = validator.formSubmitted; validator.prepareElement(element); validator.formSubmitted = submitted; validator.successList.push(element); validator.showErrors(); } else { var errors = {}; //var message = (response.Message || validator.defaultMessage(element, "jsonremote")); var message = response.Message || "远程验证未通过"; errors[element.name] = $.isFunction(message) ? message(value) : message; validator.showErrors(errors); } previous.valid = valid; validator.stopRequest(element, valid); } }, param)); return "pending"; } else if (this.pending[element.name]) { return "pending"; } return previous.valid; });
服务器端方法如下(MVC中):
public JsonResult CheckEmail(string UserEmail) { return new JsonResult { Data = new { Result = false, Message="Please change the filed" } }; }
我们就可以使用jsonremote来取代remote方法了。当然,remote方法依然可以使用。
6.错误显示规则
var validateOpts = { wrapper: "div",// default has no wrapper errorClass: "invalid", // the default value is error errorElement: "em", // default value is lable errorLabelContainer: "#messageBox", // to gather all the error messages }