关于javascript:HTML-表单元素GET和POST

在这里插入代码片

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
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