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jquery implements a simple form validation example_jquery

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Release: 2016-05-16 15:07:18
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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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