Can there be multiple forms in html5?

There can be multiple forms in html5. The rules allow the use of multiple form tags in the same HTML page. However, in order to prevent the backend from not recognizing it when submitting, you need to add different IDs or classes to the form. The syntax is "form elementform element....".

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

The most important performance of the form is to receive the user's information on the client, and then submit the data to the background program to manipulate the data. From a technical concept, the form is used to operate the form object, and the object is A basic data type.

HTML form is an area containing form elements, used to collect different types of user input; form elements allow users to enter text fields in the form (such as: text fields, drop-down lists, radio buttons, check boxes, etc. etc.) element for entering information; forms are defined using the form tag (

).

The form ultimately needs to submit data to the server. The form tag has an action attribute, which is used to specify the server address;

• The action attribute is used to determine attribute submission. To which server.

• The action attribute is the same as the href attribute in the hyperlink. You can send a request to the server

<from><!--url指提交的目标网站 -->
<!-- 画一个提交按钮
	这个按钮可以使用input输入阈，type="submit"的时候表示这个按钮是一个提交按钮，具有提交表单的能力 -->
<!-- 对于按钮来说，按钮的value属性用来指定按钮上显示的文本信息。 -->
	<input>
	<!-- buutton这是一个普通按钮，不具备提交表单的能力 -->
		<input>
</from>

There can be multiple forms in a web page

In the same HTML The rules on the page allow the use of multiple

tags, but in order to prevent the backend from not recognizing it when submitting, it is best to add different IDs or classes to the form. The choice here is to add different IDs. The method is for your reference.

There is not much difference between forms and hyperlinks

• Hyperlinks and forms are both You can send a request to the server

• Hyperlinks cannot collect data

• The form can also carry data while sending a request

In what format is the form submitted to the server?

http://localhots:8080/jd/login?username=abc&userpwd=111

Format:

actionname=vaule&namevaule&name=vaule&name=vaule&name=vaule…

The HTTP protocol stipulates that it must be submitted to the server in this format.

nbsp;html>

	
		<meta>
		<title></title>
	
	
	

用户名	<input>
密码	<input>
<input>      <input>

multiple="multiple" Supports multiple selection

Add size at the back, you can set the upper limit of multiple selection

<select></select>

file control (upload file)

<input>

readonly disabled

		<!-- readonly与disabled相同点：都是只读不能修改
		但是readonly可以提交给服务器，disabled数据不会被提交（即使有name属性也不会被提交）-->
		

用户代码<input>
用户代码<input>
<input>

maxlength

Set the number of characters that can be entered in the text box

<input>

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