目录
表单是什么? from 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
获得要提交的信息
代码:
- html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Titletitle>
- 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>
- // 获取文本框的信息
- let input_text = document.getElementById('username');
- // 得到输入框的值
- input_text.value
-
- // 修改输入框的值
- input_text.value = '请输入内容'
-
- // 获取boy和girl的值
- let boy_radio = document.getElementById('boy');
- let girl_radio = document.getElementById('girl');
-
-
- //对于单选框,多选框等等固定的值,boy_radio.value girl_radio.value只能取到当前的值
- boy_radio.value;
- girl_radio.value;
-
- //查看返回的结果是否为true,如果是true,则被选中~
- boy_radio.checked;
- girl_radio.checked;
- // 如果想要女孩被选中则: girl_radio.checked = true;
- // 如果想要男孩被选中则: boy_radio.checked = ture;
-
-
- script>
-
- body>
- html>
输出效果:
创建表单,获取文本框的数值
修改文本框的值
获取单选框的值(后面可以使用checked去判断是否被选中!)
未加密:
- html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Titletitle>
- head>
- <body>
-
- <form action="post">
-
- <p>
- <span>用户名:span>
- <input type="text" id="username">
- p>
- <p>
- <span>密码:span>
- <input type="text" id="password">
- p>
-
-
- <button type="button" onclick="aaa()">提交button>
-
- form>
-
- <script>
-
- function aaa() {
- //获取用户名和密码
- let uname = document.getElementById('username');
- let pwd = document.getElementById('password');
- //将用户名和密码的值打印出来
- console.log(uname.value);
- console.log(pwd.value);
- }
- script>
-
-
- body>
- html>
输出效果:
提交表单 MD5加密密码 表单优化
代码:
- html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Titletitle>
- 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>
- // 获取文本框的信息
- let input_text = document.getElementById('username');
- // 得到输入框的值
- input_text.value
-
- // 修改输入框的值
- input_text.value = '请输入内容'
-
- // 获取boy和girl的值
- let boy_radio = document.getElementById('boy');
- let girl_radio = document.getElementById('girl');
-
-
- //对于单选框,多选框等等固定的值,boy_radio.value girl_radio.value只能取到当前的值
- boy_radio.value;
- girl_radio.value;
-
- //查看返回的结果是否为true,如果是true,则被选中~
- boy_radio.checked;
- girl_radio.checked;
- // 如果想要女孩被选中则: girl_radio.checked = true;
- // 如果想要男孩被选中则: boy_radio.checked = ture;
-
-
- script>
-
- body>
- html>
也可以参考这个代码:
- html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Titletitle>
-
- <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 f()">
- <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-pwd" name="password">
-
-
- <button type="submit">提交button>
- form>
-
- <script>
- function f() {
- let username = document.getElementById('username');
- let pwd = document.getElementById('input-password');
- let md5PWD = document.getElementById('md5-pwd');
- console.log(username.value);
- //md5算法
- md5PWD.value = md5(pwd.value);
- //可以校验判断表单内容,true就是可以提交,false就是阻止提交
- return true;
- }
- script>
- body>
- html>