Example tutorial on using html form tags to interact with users

Use form tags to interact with users

How does the website interact with users? The answer is to useHTML form(form). The form can transmit the data entered by the viewer to the server, so that the server-side program can process the data passed by the form.

Grammar:

Explanation:

1.

2.action:The place where the data entered by the visitor is sent, such as a PHP page (save.php).

3.method：Method of data transmission (get/post).

 用户名:  密码:  

Note:

1. All formcontrols(text box, text field,button, Radio button,checkbox, etc.) must be placed between the

The get and post methods in Form correspond to the GET and POST methods respectively during the data transmission process.
The main differences between the two are as follows:

1. Get adds the data in the form to the end of the URL pointed to by the action in the form of variable=value, and the two are connected using "?", and eachVariablesare connected using "&"; Post puts the data in the form in the data body of the form, and passes it to the URL pointed to by the action according to the corresponding method of variables and values.
The following form:

php.cn/test. asp ?name=lilian&password=12345678

2. Get is notsafe, because during the transmission process, the data is stored in the requested URL address, so there may be Some private information is seen by third parties.
3. The amount of data transmitted by the Get method is very small, generally limited to about 2KB, but the execution efficiency is better than the Post method; while the amount of data transmitted by the Post method is relatively large, it is waiting for the server to read the data, but There is also a byte limit. This is to avoid malicious attacks on the server with large amounts of data. According to Microsoft, Microsoft has a limit on the maximum data that can be received using Request.Form(). It is 80KB bytes in IIS4 and 80KB in IIS5. 100KB bytes.

To sum up, please try to use the Post method.

【Related recommendations】

1.Free html online video tutorial

2.html development manual

3.php.cn original html5 video tutorial

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