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JavaScript-操作表单和前端加密

news 来源：原创 2024/5/4 7:45:35

1.获得和设置表单的值

表单是什么？form-----DOM树

文本框----text
下拉框----select
单选框----radio
多选框----checkbox
隐藏域----hidden
密码框----password
…

表单的目的：提交信息
我们获得要提交的信息

写个表单

1）得到输入框的值

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="post">
    <span>用户名：</span><input type="text"id="username">
</form>
<script>
    var input_text = document.getElementById('username');

</script>
</body>
</html>

2）修改输入框的值

3）对于单选框和多选框，查看返回结果:

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="post">
    <p>
        <span>用户名：</span><input type="text"id="username">
    </p>
    <p>
        <span>性别：</span>
        <input type="radio" name="sex" value="man" id="boy">男
        <input type="radio" name="sex" value="woman" id="girl">女
    </p>

</form>
<script>
    var input_text = document.getElementById('username');
    var boy_radio = document.getElementById('boy');
    var girl_radio = document.getElementById('girl');

    //对于单选框，多选框等固定的值，用value只能取到当前的值

</script>
</body>
</html>

2.表单的提交验证

简单测试表单的提交:

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="post">
    <p>
        <span>用户名：</span><input type="text" id="username">
    </p>
    <p>
        <span>密码：</span><input type="password" id="password">
    </p>
<!--    绑定事件 onclick 被点击-->
    <button type="button" onclick="aaa()">提交</button>
</form>
<script>
    function aaa() {
        var uname = document.getElementById('username');
        var pwd = document.getElementById('password');
        console.log(uname.value);
        console.log(pwd.value);
    }
</script>
</body>
</html>

3.MD5加密算法

md5为计算机安全领域广泛使用的一种散列函数，用以提供消息的完整性保护。md5将整个文件当作一个大文本信息，通过其不可逆的字符串变换算法，产生了这个唯一的md5信息摘要。

MD5加密工具类：https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.min.js

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--MD5加密工具类-->
    <script src = "https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.min.js">

    </script>
</head>
<body>
<form action="#" method="post">
    <p>
        <span>用户名：</span><input type="text" id="username">
    </p>
    <p>
        <span>密码：</span><input type="password" id="password">
    </p>
<!--    绑定事件 onclick 被点击-->
    <button type="button" onclick="aaa()">提交</button>
</form>
<script>
    function aaa() {
        var uname = document.getElementById('username');
        var pwd = document.getElementById('password');
        console.log(uname.value);
        //MD5加密
        pwd.value=md5(pwd);
        console.log(pwd.value);
    }
</script>
</body>
</html>

按钮绑定提交事件：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--MD5加密工具类-->
    <script src = "https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.min.js">

    </script>
</head>
<body>
<form action="#" method="post">
    <p>
        <span>用户名：</span><input type="text" id="username" name="username">
    </p>
    <p>
        <span>密码：</span><input type="password" id="input-password">
    </p>
    <input type="hidden" id="md5-password" name="password">
<!--    绑定事件 onclick 被点击-->
    <button type="submit" onclick="aaa()">提交</button>
</form>
<script>
    function aaa() {
        var uname = document.getElementById('username');
        var pwd = document.getElementById('input-password');
        var md5pwd = document.getElementById('md5-password');

        md5pwd.value=md5(pwd.value);
        return false;
    }
</script>
</body>
</html>

表单绑定提交事件

需要通过οnsubmit= 绑定一个提交检测的函数：true false

再将这个结果返回给表单，使用onsubmit接收

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--MD5加密工具类-->
    <script src = "https://cdn.bootcss.com/blueimp-md5/2.10.0/js/md5.min.js">

    </script>
</head>
<body>
<form action="https://www.baidu.com/" method="post" onsubmit="return aaa()">
    <p>
        <span>用户名：</span><input type="text" id="username" name="username">
    </p>
    <p>
        <span>密码：</span><input type="password" id="input-password">
    </p>
    <input type="hidden" id="md5-password" name="password">
<!--    绑定事件 onclick 被点击-->
    <button type="submit">提交</button>
</form>
<script>
    function aaa() {
        alert(1);
        var uname = document.getElementById('username');
        var pwd = document.getElementById('input-password');
        var md5pwd = document.getElementById('md5-password');

        md5pwd.value=md5(pwd.value);
        return false;
    }
</script>
</body>
</html>