zoukankan html css js c++ java

js验证表单并提交

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
    <head>
        <title></title>
        <meta http-equiv="content-type" content="text/html;charset=utf-8">
        <meta name="keywords" content="html,javascript,css">
        <script type="text/javascript">
            function denglu()
            {
                var userno=document.getElementById("userno").value;
                var userpwd=document.getElementById("userpwd").value;
                if(userno=="")
                {
                    return false;
                }
                else if(userpwd=="")
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
        </script>
    </head>
    <body>
        <form id="form1" action="test_login_handle.php" method="post">
            <div>账号：<input type="text" id="userno" placeholder="输入用户账号" /></div>
            <div>密码：<input type="password" id="userpwd" placeholder="输入用户密码" /></div>
            <div><input type="submit" value="登录" onclick="return denglu()" /></div>
        </form>
    </body>
</html>




<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
    <head>
        <title></title>
        <meta http-equiv="content-type" content="text/html;charset=utf-8">
        <meta name="keywords" content="html,javascript,css">
        <script type="text/javascript">
            function denglu()
            {
                var userno=document.getElementById("userno").value;
                var userpwd=document.getElementById("userpwd").value;
                if(userno=="")
                {
                    return false;
                }
                else if(userpwd=="")
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
        </script>
    </head>
    <body>
        <form id="form1" action="test_login_handle.php" method="post" onsubmit="return denglu()">
            <div>账号：<input type="text" id="userno" placeholder="输入用户账号" /></div>
            <div>密码：<input type="password" id="userpwd" placeholder="输入用户密码" /></div>
            <div><input type="submit" value="登录" /></div>
        </form>
    </body>
</html>




<<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
    <head>
        <title></title>
        <meta http-equiv="content-type" content="text/html;charset=utf-8">
        <meta name="keywords" content="html,javascript,css">
        <script type="text/javascript">
            function denglu()
            {
                var userno=document.getElementById("userno").value;
                var userpwd=document.getElementById("userpwd").value;
                if(userno=="")
                {
                    return false;
                }
                else if(userpwd=="")
                {
                    return false;
                }
                else
                {
                    document.form1.submit();
                }
            }
        </script>
    </head>
    <body>
        <form id="form1" action="test_login_handle.php" method="post">
            <div>账号：<input type="text" id="userno" placeholder="输入用户账号" /></div>
            <div>密码：<input type="password" id="userpwd" placeholder="输入用户密码" /></div>
            <div><input type="button" value="登录" onclick="denglu()" /></div>
        </form>
    </body>
</html>

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原文地址：https://www.cnblogs.com/zizaifeihuaqingsimeng/p/5947444.html