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.
Forms are enclosed in the HTML element. This HTML 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.
Forms can be made up of standard graphical user interface elements:
— a simple text box that allows input of a single line of text.
a type of that requires a partially validated email address
a type of that requires a number
— similar to , it is used for security purposes, in which the characters typed in are invisible or replaced by symbols such as *
— a radio button
— a control for uploading a file
— a reset button that, when activated, tells the browser to restore the values of the current form, to their initial values.
— a button that tells the browser to take action on the form (typically to send it to a server)
— much like the input field except a allows for multiple rows of data to be shown and entered
— a drop-down list that displays a list of items a user can select from
The sample image on the right shows most of these elements:
a text box asking for your name
a pair of radio buttons asking you to choose between gender values
a select box giving you a list of eye colors to choose from
a pair of check boxes to click on if they apply to you
a text area to describe your athletic ability
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.
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HTML5 (Hypertext Markup Language 5) is a markup language used for structuring and presenting content on the World Wide Web. It is the fifth and final major HTML version that is a World Wide Web Consortium (W3C) recommendation. The current specification is known as the HTML Living Standard. It is maintained by the Web Hypertext Application Technology Working Group (WHATWG), a consortium of the major browser vendors (Apple, Google, Mozilla, and Microsoft).
XMLHttpRequest (XHR) is a JavaScript class containing methods to asynchronously transmit HTTP requests from a web browser to a web server. The methods allow a browser-based application to make a fine-grained server call and store the results in XMLHttpRequest's responseText attribute. The XMLHttpRequest class is a component of Ajax programming. Prior to Ajax, an HTML form needed to be completely sent to the server followed by a complete browser page refresh.
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. Forms are enclosed in the HTML element.
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