Form element
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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 element form 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 (
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>
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)-->
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