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applications (CGIs). In fact, Perl is such a common way to write CGIs that the two are often confused. CGIs may be written in other languages than Perl (compatibility with multiple languages is a design goal of the CGI protocol) and there are other ways to make Perl scripts interoperate with a
359:
input type can be represented as an input text simply checking the value entered is a correct hexadecimal representation of a color, according to the specification, or a color picker widget (the latter being the solution used in most browsers which support this attribute).
346:
when the web page containing the form is loaded, and placeholder text that is displayed within the field but is not user input (such as the 'Search' text displayed in many search input fields before a search term is entered). These tasks used to be handled with
1041:
function to sanitize the user's input before inserting it onto the page. Simply printing (echoing) user input to the browser without checking it first is something that should be avoided in secure forms processors: if a user entered the JavaScript code
325:
attribute. This allows labels to stay with their elements when a window is resized and to allow more desktop-like functionality (e.g. clicking a radio button or checkbox's label will activate the associated input element).
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companies provide templates to their clients as an add-on service. Other form hosting services offer free contact forms that a user can install on their own website by pasting the service's code into the site's HTML.
329:
HTML 5 introduces a number of input tags that can be represented by other interface elements. Some are based upon text input fields and are intended to input and validate specific common data. These include
299:. In both cases, a server-side process is responsible for processing the information, while JavaScript handles the user-interaction. Implementations of these interface elements are available through
531:
ways. In addition, processing forms on a server often results in increased security if server-side execution is designed not to trust the data supplied by the client and includes such techniques as
1262:, however, and many of the most popular form-to-email scripts in use are vulnerable to hijacking for the purpose of sending spam emails. One of the most popular scripts of this type was
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as the form action, was proposed in RFC 1867 section 5.6, during the HTML 3.2 era. Various web browsers implemented it by invoking a separate email program, using their own rudimentary
1258:
Among the simplest and most commonly needed types of server-side script is that which simply emails the contents of a submitted form. This kind of script is frequently exploited by
1282:. Usually, these companies give some kind of visual editor, reporting tools and infrastructure to create and host the forms, that can be embedded into webpages.
503:
Server-side code can do a vast assortment of tasks to create dynamic web sites that, for technical or security reasons, client-side code cannot — from
523:. A significant advantage to server-side over client-side execution is the concentration of functionality onto the server rather than relying on different
91:
368:
When data that has been entered into HTML forms is submitted, the names and values in the form elements are encoded and sent to the server in an
1270:. Today, this script is no longer widely used in new development due to lack of updates, security concerns, and difficulty of configuration.
314:
tag, which is intended to represent a caption in a user interface, and can be associated with a specific form control by specifying the
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539:—server side processing for all users occurs on the server, while client side processing occurs on individual client computers.
1149:. However, many web hosts today effectively only support PHP, and developers of web applications often seek compatibility with them.
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1459:. Although sometimes unreliable, it was briefly popular as a simple way to transmit form data without involving a web server or
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handling functionality than programming languages such as C, and also have automatic memory management which helps to prevent
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of the form data and/or to prepare the form data to send to a server-side program. This usage is being replaced, however, by
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Although any programming language can be used on the server to process a form's data, the most commonly used languages are
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is one very common language used for server-side "programming" and is one of the few languages created specifically for
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with each cell containing a text input element. A tree view could also be mimicked through nested tables or, more
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for numeric values. There are additional attributes to specify required fields, fields that should have keyboard
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that, when activated, tells the browser to restore the values of the current form, to their initial values.
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attribute used in the form. Here is a basic form handler PHP script that will display the contents of the
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attribute of the form tag. The target PHP file then accesses the data passed by the form through PHP's
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While client-side languages used in conjunction with forms are limited, they often can serve to do pre-
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page, just as if it had been coded by the developer; malicious code could be executed this way.
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A modern Perl 5 CGI using the CGI module with a form similar to the one above might look like:
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input type displays a calendar from which the user can select a date or date range. And the
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864:// requesting the value of the external variable "first_name" and filtering it.
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432:. The most popular languages include both client-side and/or server-side languages.
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that tells the browser to take action on the form (typically to send it to a server)
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that allows dynamic creation and modification of a web page within the browser.
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To use PHP with an HTML form, the URL of the PHP script is specified in the
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was introduced in PHP 5.2. Users of earlier PHP versions could use the
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Registration form of PHP-based e-commerce web-shop software ZenCart
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a pair of radio buttons asking you to choose between gender values
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commonly used to design interactive forms in web development are
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A grid view, however, can be mimicked by using a standard HTML
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the data entered into the form should be submitted to, and the
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Forms are usually combined with programs written in various
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The sample image on the right shows most of these elements:
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to sanitize the user input before doing anything with it.
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a submit button to send current form values to the server
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allows for multiple rows of data to be shown and entered
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392:, is based on a very early version of the general URI
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a pair of check boxes to click on if they apply to you
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and some of the compiled languages commonly used are
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that displays a list of items a user can select from
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408:". Another possible encoding, Internet media type
158:that requires a partially validated email address
58:forms because web users fill out the forms using
1145:Perl CGIs were once a very common way to write
527:to implement various functions in consistent,
396:rules, with a number of modifications such as
259:giving you a list of eye colors to choose from
46:allows a user to enter data that is sent to a
272:These basic elements provide the most common
265:a text area to describe your athletic ability
8:
148:that allows input of a single line of text.
70:. For example, forms can be used to enter
1565:Wikibooks: HyperText Markup Language/Forms
535:. One disadvantage to server side code is
1503:"Intro to Online Forms and Form Builders"
1295:HTML forms were first implemented by the
1117:. Perl scripts are traditionally used as
629:variables, depending on the value of the
400:normalization and replacing spaces with "
109:element. This HTML element specifies the
94:Sample form. The form is enclosed in an
89:
1415:"input type=color – color-well control"
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511:, to retrieving and storing data in a
384:transport was also used. The default
7:
1439:User-agent support for email based
1363:"Better Web Forms with HTML5 Forms"
1113:is another language often used for
50:for processing. Forms can resemble
1443:form submission, using a 'mailto'
1032:The sample code above uses PHP's
321:of the control in the label tag's
25:
1556:'s spec page for forms in HTML 4.
1361:Satrom, Brandon (November 2011).
390:application/x-www-form-urlencoded
133:Forms can be made up of standard
1278:Some companies offer forms as a
386:MIME type (internet media type)
249:a text box asking for your name
439:, which tend to have stronger
416:Use with programming languages
1:
1474:"PHP: Hypertext Preprocessor"
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472:(DOM) leads to the method of
728:"form_handler.php"
197:control for uploading a file
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1239:"Hello, $ name!"
468:. Using JavaScript on the
464:language for web sites is
334:to enter email addresses,
102:Forms are enclosed in the
27:Input fields on a Web page
1587:User interface techniques
1560:HTML5 forms specification
1106:Perl programming language
637:input field on the page:
1570:Try out HTML properties.
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1126:than using CGI (such as
1119:Common Gateway Interface
997:/* printing the value */
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274:graphical user interface
135:graphical user interface
117:of submitting the data,
1550:Forms in HTML documents
1455:by implementing entire
338:for telephone numbers,
1203:"first_name"
891:FILTER_SANITIZE_STRING
885:"first_name"
762:"first_name"
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372:request message using
310:HTML 4 introduced the
295:appropriately, nested
227:input field except a
168:that requires a number
111:communication endpoint
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1389:"Forms – HTML5"
1344:"HTML/Elements/label"
1268:Matt's Script Archive
1254:Form-to-email scripts
858:<!DOCTYPE html>
649:<!DOCTYPE html>
557:interpreted languages
551:Interpreted languages
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499:Server-side execution
470:Document Object Model
462:client-side scripting
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422:programming language
301:JavaScript libraries
1527:. Web Design Museum
1525:webdesignmuseum.org
1164:#!/usr/bin/env perl
1100:regular expressions
437:scripting languages
410:multipart/form-data
380:. Historically, an
1488:"Encyclopedia Web"
798:"submit"
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428:to create dynamic
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98:for visual layout.
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223:— much like the
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1350:. 19 May 2023.
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517:spell checking
505:authenticating
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445:buffer overrun
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404:" instead of "
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239:drop-down list
235:<select>
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174:— similar to
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1264:"FormMail.pl"
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1182:qw(:standard)
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979:"Hello,
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1529:. Retrieved
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1507:Blitzen Blog
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1423:. Retrieved
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1397:. Retrieved
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1371:. Retrieved
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525:web browsers
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293:semantically
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205:reset button
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186:radio button
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39:
35:
31:
29:
1531:17 February
1399:20 February
1373:20 February
1369:. Microsoft
1348:w3.org wiki
1284:Web hosting
867:$ firstName
537:scalability
495:attribute.
451:Client-side
336:<tel>
195:file select
144:— a simple
86:Description
76:credit card
68:text fields
1581:Categories
1521:"ViolaWWW"
1425:31 October
1330:References
1124:web server
765:/></
635:first_name
481:validation
466:JavaScript
426:developers
364:Submission
349:JavaScript
257:select box
137:elements:
96:HTML table
60:checkboxes
18:Form (web)
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