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Diagram of a double POST problem encountered in user agents. Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.
a submit button to send current form values to the server; These basic elements provide the most common graphical user interface (GUI) elements, but not all. For example, there are no equivalents to a tree view or grid view. A grid view, however, can be mimicked by using a standard HTML table with each cell
In ASP, a form and its POST action have to be created as two separate pages, resulting in the need for an intermediate page and a redirect if one simply wants to perform a postback. This problem was addressed in ASP.NET with the __doPostBack() function and an application model that allows a page to perform validation and processing on its own ...
Starting with HTML 4.0, forms can also submit data in multipart/form-data as defined in RFC 2388 (See also RFC 1867 for an earlier experimental version defined as an extension to HTML 2.0 and mentioned in HTML 3.2). The special case of a POST to the same page that the form belongs to is known as a postback.
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Post/Redirect/Get (PRG) is a web development design pattern that prevents some duplicate form submissions if the user clicks the refresh button after submitting the form, creating a more intuitive interface for user agents (users).
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type="submit" A submit button. type="image" An image button. The image URL may be specified with the src attribute. type="reset" A reset button for resetting the form to default values. type="text" A one-line text input field. The size attribute specifies the default width of the input in character-widths.