之前已经有一篇关于jquery.validate.js验证的文章,还不太理解的可以先看看:jQuery Validate 表单验证(这篇文章只是介绍了一下如何实现前台验证,并没有涉及后台验证remote方法)。
有时候我们不仅仅对表单所录入的信息进行验证还需要将录入的值与数据库进行比较,这时我们就需要借助remote方法来实现。这篇文章就是介绍 jquery.validate.js的后台验证的remote方法,准备工作,前台页面:
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
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< html >
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< head >
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< meta http-equiv = "Content-Type" content = "text/html; charset=UTF-8" >
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< title >Insert title here</ title >
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< style type = "text/css" >
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form{max-width:800px; margin:0 auto;} |
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form label{display:inline-block;width:150px; text-align:right;} |
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fieldset{margin-bottom:25px;} |
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legend { |
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border: 1px solid #77848D;
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font-family: "Arial";
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font-size: 14px;
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margin-left: 15px;
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padding: 5px;
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} |
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em.error{font-weight:normal; color:red;} |
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</ style >
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< script src = "test/jquery.js" type = "text/javascript" ></ script >
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< script src = "test/jquery.validate.js" type = "text/javascript" ></ script >
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< script src = "test/jquery.validate.message_cn.js" type = "text/javascript" ></ script >
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</ head >
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< body >
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< form name = "test" id = "testform" method = "get" action = "get.php" >
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< fieldset >
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< legend title = "用户注册(User Register)" >用户注册(User Login)</ legend >
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< p >
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< label for = "name" >用户名:</ label >
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< input id = "name" name = "name" type = "text" />
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</ p >
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< p >
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< label for = "mail" >邮箱:</ label >
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< input id = "mail" name = "mail" type = "password" />
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</ p >
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< p >
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< label for = "password" >密码:</ label >
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< input id = "password" name = "password" type = "password" />
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</ p >
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< p >
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< label for = "repassword" >重复密码:</ label >
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< input id = "repassword" name = "repassword" type = "password" />
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</ p >
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< p >
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< label for = "hash" >邀请码:</ label >
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< input id = "hash" name = "hash" type = "text" />
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</ p >
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< p >
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< label for = "sel" >选择:</ label >
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< select id = "sel" name = "sel" >
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< option value = "" >请选择</ option >
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< option value = "1" >选择1</ option >
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< option value = "2" >选择2</ option >
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< option value = "3" >选择3</ option >
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< option value = "4" >选择4</ option >
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</ select >
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</ p >
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< p >
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< label for = "type" >用户类型:</ label >
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< span >< input name = "type" type = "radio" value = "1" />类型1</ span >
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< span >< input name = "type" type = "radio" value = "2" />类型2</ span >
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< span >< input name = "type" type = "radio" value = "3" />类型3</ span >
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</ p >
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< p >
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< label for = "submit" > </ label >
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< input class = "submit" type = "submit" value = "注册" />
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</ p >
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</ fieldset >
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</ form >
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</ body >
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</ html >
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要实现的效果:
由图可知我们要准备三个远程验证的文件(这里只是做到这种效果,就不连接数据库查找数据了,如果要和数据库的数据进行匹配原理是一样的,在这里就不赘述查找数据的方法了,相信程序员们都该掌握数据库的操作才行。在这里我们直接定义一个变量来进行匹配):
1.checkhash.php
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<?php |
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if ( $_GET )
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{ |
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$hash = $_GET [ ‘hash‘ ];
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if ( $hash == ‘123456‘ )
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{
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echo ‘true‘ ;
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} else {
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echo ‘false‘ ;
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}
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exit ();
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} |
2.checksel.php
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<?php |
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if ( $_GET )
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{ |
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$sel = $_GET [ ‘sel‘ ];
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if ( $sel == 2)
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{
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echo ‘true‘ ;
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} else {
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echo ‘false‘ ;
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}
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exit ();
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} |
3.changeusertype.php
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<?php |
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if ( $_GET )
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{ |
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$type = $_GET [ ‘type‘ ];
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if ( $type == 2)
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{
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echo ‘true‘ ;
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} else {
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echo ‘false‘ ;
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}
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exit ();
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} |
验证代码:
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< script type = "text/javascript" >
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$(function(){ |
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$("#testform").validate({
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rules : {
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name : {
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required : true
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},
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password: {
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required: true,
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minlength: 5
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},
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repassword: {
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required: true,
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minlength: 5,
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equalTo: "#password"
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},
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hash: {
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required: true,
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remote: ‘checkhash.php‘
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},
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sel: {
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remote: ‘checksel.php‘
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},
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type: {
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remote:{
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url: "changeusertype.php",
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type: "get",
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dataType: ‘json‘,
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data: {
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‘type‘: function(){return $(‘input[name="type"]:checked‘).val();}
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}
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}
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< span ></ span >}
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},
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messages : {
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name : {
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required : ‘必填‘
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},
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password: {
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required: ‘必填‘,
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minlength: ‘最少5个字符‘
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},
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repassword: {
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required: ‘必填‘,
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minlength: ‘最少5个字符‘,
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< span ></ span >equalTo: ‘两次输入的密码不一样‘
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},
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hash: {
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required: ‘必填‘,
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remote: ‘邀请码不正确‘
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},
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sel: {
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remote: ‘选择不正确‘
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},
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type: {
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remote: ‘类型不可更改‘
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}
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},
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focusInvalid: true,
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/*指定错误信息位置*/
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errorPlacement: function (error, element) {
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error.appendTo(element.closest("p"));
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},
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//设置错误信息存放标签
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errorElement: "em",
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submitHandler: function(form) {
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}
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});
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}) |
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</ script >
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预览效果是这样的:
这样似乎已经达到了要求,但是有一个小问题当我们输入正确的值里点击提交出现了这样的问题(邀请码和选择的验证没有问题,但是单选按钮的出现了问题):
这是为什么?查阅了一些资料,在验证时会判断之前有没有验证过,当有验证过并有previousValue值时它就会忽略再次提交的值而是取上一次验证结果显示,有很多解决方法都是说更改源码,其它可以不用,我们在提交表单之前先清空之前一次验证绑定的previousValue值,这样就解决问题了。我们在验证方法之前加一个清空previousValue值的函数:
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function emptyValue()
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{ |
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if ($( ‘input[name="type"]‘ ).data( "previousValue" ))
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$( ‘input[name="type"]‘ ).data( "previousValue" ).old = null ;
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return true ;
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} |
在提交表单之前调用这个方法:
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< input class = "submit" onclick = "emptyValue()" type = "submit" value = "注册" />
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现在应该是这样的效果了(选择正确的用户类型点击提交应该可以通过验证):
这个问题是在工作时碰到的,纠结了好久是改源码呢还是不改呢,最后找到了解决方法,在闲暇的时间整理了一下,现在贴出来以作参考,如果你有更好的方法也可以告诉我哦!