Beginning HTML5 and CSS3 For Dummies
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When creating a data collection form for your website, if only a finite set of possible values is available to the user, you can give him a collection of options to choose from:

  • Check boxes: Choose more than one option.

  • Radio buttons: Choose only one option.

    Radio buttons differ from check boxes in an important way: Users can select a single radio button from a set of options but can select any number of check boxes (including none, one, or more than one).

If many choices are available (more than half a dozen), use a drop-down list instead of radio buttons or check boxes.

To create radio buttons and check boxes, take these steps:

  1. Use the element with the type attribute set to radio or checkbox.

  2. Create each option with these attributes:

    • name: Give the option a name.

    • value: Specify what value is returned if the user selects the option.

You can also use the checked attribute (with a value of checked) to specify that an option should be already selected when the browser displays the form. This is a good way to specify a default selection.

This markup shows how to format check box and radio button options:

What are some of your favorite foods?

  • Pizza
  • Ice Cream
  • Green Eggs and Ham

What is your gender?

  • Male
  • Female

The result is shown in this figure.

image0.jpg

In the preceding markup, each set of options uses the same name for each input control but gives a different value to each option. You give each item in a set of options the same name to let the browser know they’re part of a set.

If you want to, you can select as many check boxes as you like by default in the page markup — simply include checked="checked" in each element you want selected in advance.

About This Article

This article is from the book:

About the book authors:

Ed Tittel is a 30-year veteran of the technology industry with more than 140 computing books to his credit, including the bestselling HTML For Dummies.

Chris Minnick runs Minnick Web Services. He teaches, speaks, and consults on web-related topics and has contributed to numerous books, including WebKit For Dummies.

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