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Detailed explanation of HTML5 new form attributes

零下一度Original: 2017-05-06 11:52:001784browse

New formAttributes

The most complete form attributes can be obtained by checking the w3cschool-h5 form attributes. Here we only explain the common attributes

autocomplete(Autocomplete)

can record the user’s input and give prompts. This is the role of autocomplete

##Value:

on: turn on
off: turn off

Applicability:

Generally used in
input tags

Sample code:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="" >
    <input type="text" autocomplete="on" name="userName">
    <input type="submit">
</form>
</body>
</html>

Usage Note:

The tag needs to add the
name attribute
The prompt will only appear after submitting once

autofocus(get focus)

When a page has many elements for input, the user needs to use the mouse to click on the elements for input. In order to improve the user experience , we can specify the default selected elements in the page through the
autofocus attribute

Usage method:

Which
form element is needed To get the focus, just add the attribute
No need to assign a value, just add the attribute Please see the sample code

Sample code:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<form action="" >
  姓名:<input type="text"  name="userName">
  <br/>
  年龄<input type="number" name="telNum" autofocus>
  <input type="submit">
</form>
</body>
</html>

Usage Note:

Before this attribute was available, you could use
JavaScript<a href="http://www.php.cn/wiki/48.html" target="_blank"></a> to specify the element
If multiple elements in the page have this attribute set, the last one will get focus

form (form association)

When we want to When you want to submit data, you need to put the
form element in the corresponding form tag. The appearance of this attribute makes the placement of the form element no longer affected by Constraint

Usage method:

Want a certain
The element outside the form is connected to the form. You only need to add the attribute form="form id" to the element and set it to the form id## you want to establish a relationship with. #That’s it

input
tags and id is userForm form to establish contact

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="" id="userForm" >
    姓名:<input type="text"  name="userName">
    <br/>
    年龄:<input type="number" name="telNum" autofocus>
    <br/>
    <input type="submit">
</form>

<br/>
爱好:<input type="text" name="habbit" form="userForm">
</body>
</html>

Usage Note:

If you want to select multiple in a certain

input
tag value, you can use this attribute

Applicable situations:

file<a href="http://www.php.cn/wiki/1313.html" target="_blank"></a>

ctrl
button
```
9c92d2f215870f0574b39feac29f6c10
```

Some prompt information is displayed by default in the input element, which disappears automatically after the user inputs. We need to use

JavaScript

to achieve this effect until the
placeholder attribute appears

Function

##placeholder.png

显示效果如下

<input type="text"placeholder="输入用户名">

新的表单元素

除了在input标签中增加了一些新的type属性以外,H5也推出了一些新的表单元素,由于浏览器的兼容问题,使用频率并不广,了解即可 w3cSchool_新表单元素

datalist

该元素规定了输入区域的选项列表,可以让用户有一些选项

测试代码:

注:测试代码只是body内部的代码

网址:<input type="url" list="url_list" name="link"/>
<datalist id="url_list">
    <option label="W3School" value="http://www.W3School.com.cn"/>
    <option label="Google" value="http://www.google.com"/>
    <option label="Microsoft" value="http://www.microsoft.com"/>
</datalist>

电话: <input type="tel" list="tel_list">
<datalist id="tel_list">
    <option value="186xxx" label="移动">移动</option>
    <option value="187xxx" label="联通">联通</option>
    <option value="135xxx" label="天翼">天翼</option>
</datalist>

datalist:

id:id属性,想要使用该datalist的元素需要通过list=id的方式来指定

option:

value:指定具体的值
label:提示信息

注意:

如果input的type为url,option中对应的value需要使用http://开始

keygen

keygen 元素是密钥对生成器（key-pair generator）。当提交表单时，会生成两个键，一个是私钥，一个公钥。
私钥（private key）存储于客户端，公钥（public key）则被发送到服务器。公钥可用于之后验证用户的客户端证书（client certificate），即实现非对称加密
目前，浏览器对此元素的糟糕的支持度不足以使其成为一种有用的安全标准。

使用频率:低

output

属于新的语义标签:用来放置输出的内容,但是不能自动的计算结果,依旧需要通过js的方式来动态修改结果,只是相比于其他的标签,语义性更强。

使用频率:低

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