Formulários HTML

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Este módulo fornece uma série de artigos que irão ajudá-lo a dominar os formulários HTML. Os formulários HTML são uma ferramenta muito poderosa para interagir com os utilizadores; contudo, por razões históricas e técnicas, nem sempre é óbvio como utilizá-las em todo o seu potencial. Neste guia, nós iremos abordar todos os aspetos dos formulários HTML, da estrutura ao estilo, da manipulação de dados aos widgets personalizados.


Before starting this module, you should at least work through our Introduction to HTML. At this point you should find the Basic guides easy to understand, and also be able to make use of our Native form widgets guide.

The rest of the module however is a bit more advanced — it is easy to put form widgets on a page, but you can't actually do much with them without using some advanced form features, CSS, and JavaScript. Therefore, before you look at the other sections we'd recommend that you go away and learn some CSS and JavaScript first.

Nota: If you are working on a computer/tablet/other device where you don't have the ability to create your own files, you could try out (most of) the code examples in an online coding program such as JSBin or Thimble.

Guias básicos

Your first HTML form
The first article in our series provides your very first experience of creating an HTML form, including designing a simple form, implementing it using the right HTML elements, adding some very simple styling via CSS, and how data is sent to a server.
How to structure an HTML form
With the basics out of the way, we now look in more detail at the elements used to provide structure and meaning to the different parts of a form.

Que widgets de formulário estão disponíveis?

The native form widgets
We now look at the functionality of the different form widgets in detail, looking at what options are available to collect different types of data.

Validar e submeter dados de formulário

Sending form data
This article looks at what happens when a user submits a form — where does the data go, and how do we handle it when it gets there? We also look at some of the security concerns associated with sending form data.
Form data validation
Sending data is not enough — we also need to make sure that the data users fill out in forms is in the correct format we need to process it successfully, and that it won't break our applications. We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps. Form validation helps us achieve these goals — this article tells you what you need to know.

Guias avançados

How to build custom form widgets
You'll come across some cases where the native form widgets just don't provide what you need, e.g. because of styling or functionality. In such cases, you may need to build your own form widget out of raw HTML. This article explains how you'd do this and the considerations you need to be aware of when doing so, with a practical case study.
Sending forms through JavaScript
This article looks at ways to use a form to assemble an HTTP request and send it via custom JavaScript, rather than standard form submission. It also looks at why you'd want to do this, and the implications of doing so. (See also Using FormData objects.)
HTML forms in legacy browsers
Article covering feature detection, etc. This should be redirected to the cross browser testing module, as the same stuff is covered better there.

Guias de estilo de formulário

Styling HTML forms
This article provides an introduction to styling forms with CSS, including all the basics you might need to know for basic styling tasks.
Advanced styling for HTML forms
Here we look at some more advanced form styling techniques that need to be used when trying to deal with some of the more difficult-to-style elements.
Property compatibility table for form widgets
This last article provides a handy reference allowing you to look up what CSS properties are compatible with what form elements.

Consulte também