关于javascript:HTML-表单元素GET和POST

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HTML 中还有一类标签，用户能够用他们输出或抉择，向后盾服务器发送数据。

因为须要把他们放在 form（表单）标签中，所以飞哥把他们称之为表单标签。

form 标签
form 标签界定哪些表单标签的内容须要被提交到后盾。

通常来说，表单标签都要搁置在 form 标签中——否则，他们的内容不会被提交到后盾（强调：常见谬误！）

<form method="post">
</form>form 标签中须要了解以下几个属性：

action：批示表单提交到哪里解决，或者由谁来采取行动，相应 form 提交，默认为以后页面。
method：批示表单以何种形式提交到后盾，罕用的是 get（默认）或 post，区别后文详述。
PS：什么是“默认”？当你（开发人员）不进行批示的时候，被批示对象（计算机相关利用，如浏览器、编译器、解释器等）自行应用的选项。

按钮

按钮有两种写法：

    <!--<button type="submit"> 按钮 </button>-->
    <input type="submit" value="提交" />
    <input type="reset" value="重置" />type 能够有三个值：

提交（submit）
重置（reset）
一般按钮（button）

文本类标签
单行文本框（text）

    <label> 用户名：</label> <input type="text" name="username" value="大飞哥" /><br />

明码输入框（password）

    <label> 明码：</label><input type="password" name="password" disabled value="1234" /><br />

暗藏文本域（hidden）

    <!-- 不要用它存储敏感信息 -->
    <input type="hidden" name="fg" value="埋伏者" />

label 是一个语义标签，成果和 span 差不多。按 HTML 标准，label 通常和 input 配套应用；label 和 span 的区别，相似于 header 和 div 的区别。

前面咱们会发现：大多数表单标签名都是 input，区别他们的是 type。type=”text”，示意这是一个文本框；type=”password”，示意这是一个明码输入框……

name 和 value
name 通常都是要写的，因为

所有提交到后盾的数据都是“键值对”模式的字符串，
name 是键值对中的“键”，是后盾辨别传入值的惟一起源
没有 name 的表单元素无奈提交到后盾
value 代表用户的输出，能够给定一个初始值。value 属性也能够不写，就显示一个空白的文本框。

F12 演示：为了暂停页面跳转，须要：

action=”/”
IndexModel 上增加 [IgnoreAntiforgeryToken]
在 OnPost()上设置断点，须要

disabled 和 readonly
disabled：禁用。既不能批改，也不会往后台传值

readonly：只读。不能批改，但还是可能往后台传值。然而，并不是所有表单标签都可能失效。

PS：依据 HTML5 标准，disabled 和 readonly 都能够不带属性值，即只有有这个属性，就表明该元素须要 disabled 或 readonly。如果肯定要属性值，属性值就是 disabled 或 readonly

多行文本框（textarea）

    <label> 自我介绍：</label><br />
    <textarea name="selfDescription"> 飞哥飞哥 </textarea><br />

留神：

它的标签名是 textarea，不是 input
没有 value 属性，默认值设定在标签文本中
当前学 JavaScript 的时候，取值赋值会有一些差别。

常见面试题：GET 和 POST

HTTP 协定
客户端和服务器端交互的信息分为：：

Request/Response：实际上，用户在浏览器中输出 URL，回车，浏览器就会向服务器发送一个申请（Request）；而后，服务器就会响应（Response）这个申请，将相应的 HTML 文件返回给浏览器。

Header/Body：无论是 Request 和 Response，除了 URL 和 Html 文件，还有一些额定的信息，寄存在他们的 Header 中。
GET 和 POST 就是定义在 Request 的 Header 中的，向服务器阐明，用何种形式办法（method）进行申请的标记数据。

一般来说，地址栏间接输出网址，或者在网页中点击链接，默认都是 GET 形式；只有在 form 标签中定义了 method=”post”，浏览器才会应用 POST 形式发送申请。咱们能够应用调试器 F12，在 Network 中查看：

传输数据
这个时候，咱们应该了解：form 表单自身并不传递数据，是浏览器将 form 表单中的数据进行“翻译”，而后再传递给服务器！

如果 form 中 method 属性设置为 get，浏览器应用 GET 形式，将 form 表单中的数据转换成 URL 参数，传递给服务器。留神察看 URL 的变动：
http://localhost:57210/Register?username=dfg&fg=%E6%BD%9C%E4%BC%8F%E8%80%85&selfDescription=%E9%A3%9E%E5%93%A5%E9%A3%9E%E5%93%A5 参数以? 标记结尾；每个参数等号右边是 name，左边是 value；多个参数间用 & 分隔。如果参数值不是英文和字母，会被浏览器自动编码，后果如上所示。
如果 form 中 method 属性设置为 post，浏览器应用 POST 形式，将 form 表单中的数据转换成 Form Data，传递给服务器。（按 HTTP 协定，GET 申请没有 Form Data 项）

前因后果：（参考 HTTP 的倒退）

最早的 HTTP 协定既没有 POST，也没有 Header……

Header（尤其是其中的 ContentType）为 HTTP 的倒退（扩大）立下了汗马功劳

常见谬误
在网上风行着很多说法，很多都是不筹备的。大抵上来说，谬误起因有两类：

1）没有辨别“HTTP 协定”和“浏览器实现”：比如说“GET 传递数据有个数 / 长度 / 大小限度”等，这些限度都是浏览器的限度，HTTP 协定从未限度过 URL 参数。

2）没有辨别对于“荫蔽”和“平安”：POST 不会在地址栏中显示 Form Data，咱们能够说它更荫蔽一点，但它一样用明文（没有加密）传递，怎么就平安了呢？咱们都能用 F12 看到，黑客们还获取不到么？^_^。留神，HTTP 自身是一个不平安的协定，在 Web 开发中，平安是一个十分重要的考量因素。大家时刻牢记飞哥的两句话：

前端没有任何安全性可言
后端永远不要置信前端
最初，总结一下，GET 和 POST：

本质区别：http 头中 method 项定义不同。定义为 method=POST，能够用 Form Data 传递数据
语义层面：GET 是申请失去（读）；POST 是传递给服务器（写）

开发抉择
post：form 表单

get：须要 url 参数

抉择标签
不须要用户输出（字符），只须要点击鼠标抉择即可的标签。

单选框

    <label> 性别：</label>
    <!-- 应用 name 属性进行分组 -->
    <!-- 小技巧：用 label 包裹 -->        
    <label><input type="radio" name="gender" value="male" disabled="disabled" checked /> 男 </label>
    <!-- radio 和 checkbox 只能 disabled 不能 readonly（实际上是 bug）-->
    <input type="radio" name="gender" value="female" readonly/> 女 <br />

语法要点：

依然应用 name 和 value 想后盾传值，只是这里的 value 用户无奈批改
标签名依然是 input，由属性 type=”radio” 决定它是一个单选框
用 <lable> 包裹住 input 标签，点击整个 label 标签都能够作用于单选框
input 中增加属性 checked，就能够设置一个页面加载时的默认选中项
能够 disabled，无奈 readonly
具备雷同 name 的多个 radio，就是一组，一组 radio，只能选中一个——这就是 radio 被称之为“单”选框的起因。

复选框

<label> 喜好：</label>
<label><input type="checkbox" name="hobby" value="table-tenis" /> 乒乓球 </label>
<label><input type="checkbox" name="hobby" value="chess" /> 象棋 </label>
<label><input type="checkbox" name="hobby" value="LOL" />LOL</label>

语法要点：同 radio 的 1 -5，其余：

同组的 checkbox 能够选中多个，所以它被称之为“复”选框
被选中的 checkbox 的键（名）值对，才会传递到后盾；未被选中的 checkbox，整个键值对都不会传，而不是传一个空值什么的！
如果说没有给 checkbox 的 value 赋值，选中之后往后台传递的值为：on

下拉列表

    <label> 年龄：</label>
    <select name="age">
        <!-- 往后台传递的是 value -->
        <option value="1">one</option>
        <option value="2" selected>two</option>
        <option value="3">three</option>
    </select><br />

语法要点：

name 在 select 标签外面
有 value，就传 value，没有就传文本 text
默认选中项用 selected 属性标识
能够在 select 中增加 multiple，将其变成可多选菜单

文件上传
除了应用 type=”file” 指定 input 用于文件上传，还须要在 form 中设置：enctype=”multipart/form-data”

<form method=”post” enctype=”multipart/form-data”>

<input type="file" name="icon" />
<button type="reset">reset</button>

</form>

否则，form 元素默认应用：enctype=”application/x-www-form-urlencoded”，就只会向后盾发送文件名，而不是文件内容：

form 中指定
F12 中查看
enctype=”multipart/form-data”

enctype=”application/x-www-form-urlencoded”

HTML5 新标签 / 属性
批改 input 标签的 type 为：

color：让用户能够抉择色彩
date/datetime/month/week……：让用户抉择日期 / 工夫等
email/tel/url：能够验证用户的输出是否合乎 Email/ 电话 /URL 的格局要求
number/range：用户能够输出数字和比例
……
目前逐步开始应用的一些属性：

novalidate：用于 form，禁用掉 HTML5 自带的验证
formaction：用于提交按钮，能够指定点击该按钮将 form 表单提交到那个网址解决（笼罩 form 中的设置），在一个 form 中能够有多个按钮时有用
multiple：次要应用在文件上传框（type=”file”）中，用户按住 ctrl 键，能够抉择多个需上传文件
placeholder：文本输入框有用，可用做提醒
用得并不多。次要是因为：

须要浏览器反对
款式并不难看
用途仿佛并不大，^_^

作业
参考以下页面，尽可能多的实现其 HTML 局部的内容：

注册和登录
联系方式和个人资料
内容（任选其一）发布页面
首页
其余页面
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正文完
javascript
发表至： javascript
2020-12-27
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