Form action types in html

Атрибут action

Указывает обработчик, к которому обращаются данные формы при их отправке на сервер. В качестве обработчика может выступать CGI-программа или HTML-документ, который включает в себя серверные сценарии (например, Parser). После выполнения обработчиком действий по работе с данными формы он возвращает новый HTML-документ.

Если атрибут action отсутствует, текущая страница перезагружается, возвращая все элементы формы к их значениям по умолчанию.

Синтаксис

Значения

В качестве значения принимается полный или относительный путь к серверному файлу (URL).

Обязательный атрибут

В HTML4 и XHTML обязателен, в HTML5 не обязателен.

Значение по умолчанию

В качестве обработчика можно указать адрес электронной почты, начиная его с ключевого слова mailto: . При отправке формы будет запущена почтовая программа установленная по умолчанию. В целях безопасности в браузере установлено, что отправить незаметно информацию, введенную в форме, по почте невозможно. Для корректной интерпретации данных используйте атрибут enctype=»text/plain» в теге .

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HTML Form Attributes

This chapter describes the different attributes for the HTML element.

The Action Attribute

The action attribute defines the action to be performed when the form is submitted.

Usually, the form data is sent to a file on the server when the user clicks on the submit button.

In the example below, the form data is sent to a file called «action_page.php». This file contains a server-side script that handles the form data:

Example

On submit, send form data to «action_page.php»:

Tip: If the action attribute is omitted, the action is set to the current page.

The Target Attribute

The target attribute specifies where to display the response that is received after submitting the form.

The target attribute can have one of the following values:

Value	Description
_blank	The response is displayed in a new window or tab
_self	The response is displayed in the current window
_parent	The response is displayed in the parent frame
_top	The response is displayed in the full body of the window
framename	The response is displayed in a named iframe

The default value is _self which means that the response will open in the current window.

Example

Here, the submitted result will open in a new browser tab:

The Method Attribute

The method attribute specifies the HTTP method to be used when submitting the form data.

The form-data can be sent as URL variables (with method=»get» ) or as HTTP post transaction (with method=»post» ).

The default HTTP method when submitting form data is GET.

Example

This example uses the GET method when submitting the form data:

Example

This example uses the POST method when submitting the form data:

• Appends the form data to the URL, in name/value pairs
• NEVER use GET to send sensitive data! (the submitted form data is visible in the URL!)
• The length of a URL is limited (2048 characters)
• Useful for form submissions where a user wants to bookmark the result
• GET is good for non-secure data, like query strings in Google

• Appends the form data inside the body of the HTTP request (the submitted form data is not shown in the URL)
• POST has no size limitations, and can be used to send large amounts of data.
• Form submissions with POST cannot be bookmarked

Tip: Always use POST if the form data contains sensitive or personal information!

The Autocomplete Attribute

The autocomplete attribute specifies whether a form should have autocomplete on or off.

When autocomplete is on, the browser automatically complete values based on values that the user has entered before.

Example

A form with autocomplete on:

The Novalidate Attribute

The novalidate attribute is a boolean attribute.

When present, it specifies that the form-data (input) should not be validated when submitted.

Example

A form with a novalidate attribute:

HTML Exercises

List of All Attributes

Attribute	Description
accept-charset	Specifies the character encodings used for form submission
action	Specifies where to send the form-data when a form is submitted
autocomplete	Specifies whether a form should have autocomplete on or off
enctype	Specifies how the form-data should be encoded when submitting it to the server (only for method=»post»)
method	Specifies the HTTP method to use when sending form-data
name	Specifies the name of the form
novalidate	Specifies that the form should not be validated when submitted
rel	Specifies the relationship between a linked resource and the current document
target	Specifies where to display the response that is received after submitting the form

Источник

HTML action Attribute

On submit, send the form-data to a file named «action_page.php» (to process the input):

Definition and Usage

The action attribute specifies where to send the form-data when a form is submitted.

Browser Support

Syntax

Attribute Values

• An absolute URL — points to another web site (like action=»http://www.example.com/example.htm»)
• A relative URL — points to a file within a web site (like action=»example.htm»)

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