Note: Checkboxes are similar to radio buttons, but with an important distinction: radio buttons are designed for selecting one value out of a set, whereas checkboxes let you turn individual values on and off. Where multiple controls exist, radio buttons allow one to be selected out of them all, whereas checkboxes allow multiple values to be selected.

The value attribute is a string containing the radio button's value. The value is never shown to the user by their user agent. Instead, it's used to identify which radio button in a group is selected.


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A radio group is defined by giving each of radio buttons in the group the same name. Once a radio group is established, selecting any radio button in that group automatically deselects any currently-selected radio button in the same group.

For example, if your form needs to ask the user for their preferred contact method, you might create three radio buttons, each with the name property set to contact but one with the value email, one with the value phone, and one with the value mail. The user never sees the value or the name (unless you expressly add code to display it).

Here you see the three radio buttons, each with the name set to contact and each with a unique value that uniquely identifies that individual radio button within the group. They each also have a unique id, which is used by the element's for attribute to associate the labels with the radio buttons.

When the above form is submitted with a radio button selected, the form's data includes an entry in the form contact=value. For example, if the user clicks on the "Phone" radio button then submits the form, the form's data will include the line contact=phone.

It's fairly uncommon to actually want to allow the form to be submitted without any of the radio buttons in a group selected, so it is usually wise to have one default to the checked state. See Selecting a radio button by default below.

The value attribute is one which all s share; however, it serves a special purpose for inputs of type radio: when a form is submitted, only radio buttons which are currently checked are submitted to the server, and the reported value is the value of the value attribute. If the value is not otherwise specified, it is the string on by default. This is demonstrated in the section Value above.

The required attribute is one which most s share. If any radio button in a same-named group of radio buttons has the required attribute, a radio button in that group must be checked, although it doesn't have to be the one with the attribute applied.

Note: If you put the checked attribute on more than one radio button, later instances will override earlier ones; that is, the last checked radio button will be the one that is selected. This is because only one radio button in a group can ever be selected at once, and the user agent automatically deselects others each time a new one is marked as checked.

In the above examples, you may have noticed that you can select a radio button by clicking on its associated element, as well as on the radio button itself. This is a really useful feature of HTML form labels that makes it easier for users to click the option they want, especially on small-screen devices like smartphones.

Most notable here is the use of the appearance property (with prefixes needed to support some browsers). By default, radio buttons (and checkboxes) are styled with the operating system's native styles for those controls. By specifying appearance: none, you can remove the native styling altogether, and create your own styles for them. Here we've used a border along with border-radius and a transition to create a nice animating radio selection. Notice also how the :checked pseudo-class is used to specify the styles for the radio button's appearance when selected.

Notice that when clicking on a radio button, there's a nice, smooth fade out/in effect as the two buttons change state. In addition, the style and coloring of the legend and submit button are customized to have strong contrast. This might not be a look you'd want in a real web application, but it definitely shows off the possibilities.

When the above form is submitted with a radio button selected, the form's data includes an entry in the form contact=value. For example, if the user clicks on the \"Phone\" radio button then submits the form, the form's data will include the line contact=phone.

The newest editions of The Pitch are now available to view on RAB.com - Employment Services, Florists, and Salons & Spas.

 

 Nielsen's 2023 Consumer Survey Report is available for download.


 Misperceptions of Radio, just updated, can help you to dispel the most common myths about radio.

Register for the upcoming live presentation "Key Takeaways from CES 2024" on January 17th at 12 PM CT.


 The 2023 Top Business Trends can help with determining the "hot" months during the year for when your clients should advertise. 


 Look through the Provoke Insights page that provides radio listener insights and contains category research.

Associated Universities, Inc. (AUI) and the National Radio Astronomy Observatory (NRAO) have awarded the 2023 Karl G. Jansky Lectureship to Dr. Paul A. Vanden Bout, Senior Scientist, Emeritus at NRAO. The Jansky Lectureship is an honor established by the trustees of AUI to recognize outstanding contributions to the advancement of radio astronomy.

The Radio JOVE Project is now offering decametric radio telescope kits that use the SDRPlay RSP1A receiver. These enable our participants to observe a range of frequencies simultaneously. See the Kit Orders page.

Check out Larry's livestream if you detect something on your equipment and want a quick confirmation or if you don't have radio equipment and you're just curious to know what's up right now. You might catch a solar burst in the act or the more elusive Jupiter radio bursts. Don't forget to 'like' his livestream and subscribe to the K4LED YouTube channel to help keep him 'on the air.'

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