JS表单验证 - Newbie_小白

1、js验证radio是否选择

<!DOCTYPE >
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>无标题文档</title>
    <script type="text/javascript" src="js/jquery-2.2.2.min.js">
    </script>

    <script type="text/javascript">
        function checkform(obj) {
            for (i = 0; i < obj.oo.length; i++)
                if (obj.oo[i].checked == true) {
                    return true;
                } else {
                    alert("请选择")
                    return false;
                }
        }
    </script>
</head>

<body>

<form id="form" name="form" method="post" action="" onsubmit="return checkform(this)">
    <input type="radio" name="oo" value="radiobutton"/>选项一
    <input type="radio" name="oo" value="radiobutton"/>选项二
    <input type="submit" name="Submit" value="提交"/>
</form>
</body>

</html>



2、长度限制

<script>
   function test() {
      if (document.a.b.value.length > 5) {
         alert("不能超过5个字符！");
         document.a.b.focus();
         return false;
      }
   }
</script>
<form name="a" onsubmit="">
   <textarea name="b" cols="40" wrap="VIRTUAL" rows="6" onchange="return test()"></textarea>
</form>

3、验证邮箱格式

<script type="text/javascript">
    function isEmail(strEmail) {
        if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
            return true;
        else
            alert("请输入正确的邮箱地址！");
    }
</script>
<input type=text onblur=isEmail(this.value)>

posted on 2016-05-17 09:28 Newbie_小白阅读(169) 评论(0) 收藏举报