本文实例讲述了jQuery validate插件实现ajax验证重复的2种方法。分享给大家供大家参考，具体如下：
jquery validate 经过这种多年的改良，已经很完善了。它能满足80%的验证需要，如果validate自带的功能，不能满足我们需求，它提供了addMethod来扩展功能。下面就举个小例子来说明一下addMethod的用法。
完整demo实例代码如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<title>jquery validate ajax check exist</title>
<head>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="jquery.validate.min.js"></script>
<script>
$(document).ready(function(){
jQuery.validator.addMethod("phonecheck", function(value, element) {
string = value.match(/0(\d{2,2})-(\d{7,7})/ig);
if(string != null){
return true;
}else{
return false;
}
}, "telphone number like 021-1234567");
jQuery.validator.addMethod("phonesame", function(value, element) {
var flag = 1;
$.ajax({
type:"POST",
url:'tel.php',
async:false,
data:{'tel':value},
success: function(msg){
if(msg == 'yes'){
flag = 0;
}
}
});
if(flag == 0){
return false;
}else{
return true;
}
}, "sorry number have been exist");
$("#myform").validate({
errorPlacement: function(error, element) {
error.insertAfter(element);
},
rules:{
username:{
required:true,
remote:{
url:"tel.php",
type:"post",
dataType:"html",
data:{
username:function(){return $("#username").val();}
},
dataFilter: function(data, type) {
if (data == "yes")
return true;
else
return false;
}
}
},
telphone:{
required:true,
rangelength:[11,11],
phonecheck:true,
phonesame:true
}
},
messages:{
telphone:{
required:"Please enter your phone",
rangelength:"phone must be 11 numbers"
},
username:{
required:"Please enter your username",
remote:"the username have been exist"
}
},
debug:true
})
});
</script>
</head>
<body style="margin-left:500px;margin-top:100px;">
<div style="font-size:24px;">021-1234567 or tank exist</div><br>
<form id="myform" method="post">
<label>Your telphone</label>
<input name="telphone" class="required" value="" /><br><br>
<label>Your username</label>
<input name="username" id="username" class="required" value="" />
<br/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>在这里推荐大家使用jquery validate，用熟了，很方便。
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