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Postback
In web development, a postback is an POST (HTTP), HTTP POST to the same page that the Form (HTML), form is on. In other words, the contents of the form are ''POST''ed ''back'' to the same URL as the form. Postbacks are commonly seen in edit forms, where the user introduces information in a form and hits "save" or "submit", causing a postback. The server then refreshes the same page using the information it has just received. Postbacks are most commonly discussed in relation to JavaServer Faces, JSF and Active Server Page, ASP or ASP.NET. 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 form data. In JSF, postbacks trigger the full JSF life-cycle, which just like ASP.NET performs conversion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
POST (HTTP)
In computing, POST is a HTTP#Request methods, request method supported by HTTP used by the World Wide Web. By design, the POST request method requests that a web server accept the data enclosed in the body of the request message, most likely for storing it. It is often used when uploading a file or when submitting a completed form (HTML), web form. In contrast, the HTTP Hypertext Transfer Protocol#Request methods, GET request method retrieves information from the server. As part of a GET request, some data can be passed within the URL's query string, specifying (for example) search terms, date ranges, or other information that defines the query. As part of a POST request, an arbitrary amount of data of any type can be sent to the server in the body of the request message. A List of HTTP header fields, header field in the POST request usually indicates the message body's Internet media type. Posting data The world wide Web and HTTP are based on a number of request methods or 've ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Form (HTML)
A webform, web form or HTML form on a web page allows a user to enter data that is sent to a server for processing. Forms can resemble paper or database forms because web users fill out the forms using checkboxes, radio buttons, or text fields. For example, forms can be used to enter shipping or credit card data to order a product, or can be used to retrieve search results from a search engine. Description Forms are enclosed in the HTML <form> element. This element specifies the communication endpoint the data entered into the form should be submitted to, and the method of submitting the data, GET or POST. Elements Forms can be made up of standard graphical user interface elements: * <text> — a simple text box that allows input of a single line of text. * <email> - a type of <text> that requires a partially validated email address * <number> - a type of <text> that requires a number * <password> — similar to <text>, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JavaServer Faces
Jakarta Faces, formerly Jakarta Server Faces and JavaServer Faces (JSF) is a Java specification for building component-based user interfaces for web applications and was formalized as a standard through the Java Community Process being part of the Java Platform, Enterprise Edition. It is also an MVC web framework that simplifies the construction of user interfaces (UI) for server-based applications by using reusable UI components in a page. JSF 2.x uses Facelets as its default templating system. Users of the software may also choose to employ technologies such as XUL, or Java. JSF 1.x uses JavaServer Pages (JSP) as its default templating system. History In 2001, the original Java Specification Request (JSR) for the technology that ultimately became JavaServer Faces proposed developing a package with the name javax.servlet.ui In June 2001, ''JavaWorld'' would report on Amy Fowler's team's design of "the JavaServer Faces API" (also known as "Moonwalk") as "an application framew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Active Server Page
Active Server Pages (ASP) is Microsoft's first server-side scripting language and engine for dynamic web pages. It was first released in December 1996, before being superseded in January 2002 by ASP.NET. History Initially released as an add-on to Internet Information Services (IIS) via the Windows NT 4.0 Option Pack (1996), it is included as a component of Windows Server (since the initial release of Windows 2000 Server). There have been three versions of ASP, each introduced with different versions of IIS: * ASP 1.0 was released in December 1996 as part of IIS 3.0 * ASP 2.0 was released in September 1997 as part of IIS 4.0 * ASP 3.0 was released in November 2000 as part of IIS 5.0 ASP 2.0 provides six built-in objects: Application, ASPError, Request, Response, Server, and Session. Session object, for example, represents a session that maintains the state of variables from page to page. The Active Scripting engine's support of the Component Object Model enables ASP webs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ajax (programming)
Ajax (also AJAX ; short for " Asynchronous JavaScript and XML") is a set of web development techniques that uses various web technologies on the client-side to create asynchronous web applications. With Ajax, web applications can send and retrieve data from a server asynchronously (in the background) without interfering with the display and behaviour of the existing page. By decoupling the data interchange layer from the presentation layer, Ajax allows web pages and, by extension, web applications, to change content dynamically without the need to reload the entire page. In practice, modern implementations commonly utilize JSON instead of XML. Ajax is not a technology, but rather a programming concept. HTML and CSS can be used in combination to mark up and style information. The webpage can be modified by JavaScript to dynamically display—and allow the user to interact with the new information. The built-in XMLHttpRequest object is used to execute Ajax on webpages, allowing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
