jquery implements a simple form validation example_jquery
Form verification is often encountered during website development. We can use server-side language verification or client-side language verification. This article introduces you to a simple example of jquery client validation form. Examples are for reference only.
<body>
<form method="post" action="">
<div class="int">
<label for="username">用户名:</label>
<!-- 为每个需要的元素添加required -->
<input type="text" id="username" class="required" />
</div>
<div class="int">
<label for="email">邮箱:</label>
<input type="text" id="email" class="required" />
</div>
<div class="int">
<label for="personinfo">个人资料:</label>
<input type="text" id="personinfo" />
</div>
<div class="sub">
<input type="submit" value="提交" id="send"/><input type="reset" id="res"/>
</div>
</form>
</body>
<script src="/Public/js/jquery-1.7.1.min.js"></script>
<script type="text/javascript">
//<![CDATA[
$(function(){
/*
*思路大概是先为每一个required添加必填的标记，用each()方法来实现。
*在each()方法中先是创建一个元素。然后通过append()方法将创建的元素加入到父元素后面。
*这里面的this用的很精髓，每一次的this都对应着相应的input元素，然后获取相应的父元素。
*然后为input元素添加失去焦点事件。然后进行用户名、邮件的验证。
*这里用了一个判断is()，如果是用户名，做相应的处理，如果是邮件做相应的验证。
*在jQuery框架中，也可以适当的穿插一写原汁原味的javascript代码。比如验证用户名中就有this.value，和this.value.length。对内容进行判断。
*然后进行的是邮件的验证，貌似用到了正则表达式。
*然后为input元素添加keyup事件与focus事件。就是在keyup时也要做一下验证，调用blur事件就行了。用triggerHandler()触发器，触发相应的事件。
*最后提交表单时做统一验证
*做好整体与细节的处理
*/
//如果是必填的，则加红星标识.
$("form :input.required").each(function(){
var $required = $("<strong class='high'> *</strong>"); //创建元素
$(this).parent().append($required); //然后将它追加到文档中
});
//文本框失去焦点后
$('form :input').blur(function(){
var $parent = $(this).parent();
$parent.find(".formtips").remove();
//验证用户名
if( $(this).is('#username') ){
if( this.value=="" || this.value.length < 6 ){
var errorMsg = '请输入至少6位的用户名.';
$parent.append('<span class="formtips onError">'+errorMsg+'</span>');
}else{
var okMsg = '输入正确.';
$parent.append('<span class="formtips onSuccess">'+okMsg+'</span>');
}
}
//验证邮件
if( $(this).is('#email') ){
if( this.value=="" || ( this.value!="" && !/.+@.+\.[a-zA-Z]{2,4}$/.test(this.value) ) ){
var errorMsg = '请输入正确的E-Mail地址.';
$parent.append('<span class="formtips onError">'+errorMsg+'</span>');
}else{
var okMsg = '输入正确.';
$parent.append('<span class="formtips onSuccess">'+okMsg+'</span>');
}
}
}).keyup(function(){
$(this).triggerHandler("blur");
}).focus(function(){
$(this).triggerHandler("blur");
});//end blur
//提交，最终验证。
$('#send').click(function(){
$("form :input.required").trigger('blur');
var numError = $('form .onError').length;
if(numError){
return false;
}
alert("注册成功,密码已发到你的邮箱,请查收.");
});
//重置
$('#res').click(function(){
$(".formtips").remove();
});
})
//]]>
</script>
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