How To Change Color Of Inpu Radio Text When It Is Clicked
<input type="radio">
<input> elements of type radio are generally used in radio groups—collections of radio buttons describing a set of related options.
Simply one radio push in a given group can exist selected at the same fourth dimension. Radio buttons are typically rendered as pocket-sized circles, which are filled or highlighted when selected.
Try it
They are chosen radio buttons because they look and operate in a similar style to the push buttons on old-fashioned radios, such as the one shown beneath.
Note: Checkboxes are similar to radio buttons, but with an important distinction: radio buttons are designed for selecting 1 value out of a set, whereas checkboxes permit y'all plow individual values on and off. Where multiple controls exist, radio buttons allow ane to be selected out of them all, whereas checkboxes permit multiple values to be selected.
Value
The value attribute is a DOMString containing the radio button's value. The value is never shown to the user by their user amanuensis. Instead, it'south used to identify which radio button in a group is selected.
Defining a radio group
A radio group is divers by giving each of radio buttons in the group the same proper noun. Once a radio group is established, selecting any radio button in that group automatically deselects any currently-selected radio button in the same group.
You can have every bit many radio groups on a page as yous like, as long as each has its own unique proper name.
For example, if your grade needs to enquire the user for their preferred contact method, you might create iii radio buttons, each with the name holding set to contact but ane with the value email, one with the value phone, and 1 with the value postal service. The user never sees the value or the name (unless y'all expressly add code to display it).
The resulting HTML looks like this:
<course > <p > Please select your preferred contact method: </p > <div > <input blazon = "radio" id = "contactChoice1" name = "contact" value = "electronic mail" > <characterization for = "contactChoice1" > Email </label > <input type = "radio" id = "contactChoice2" name = "contact" value = "phone" > <label for = "contactChoice2" > Phone </characterization > <input blazon = "radio" id = "contactChoice3" proper noun = "contact" value = "mail" > <label for = "contactChoice3" > Mail </label > </div > <div > <button blazon = "submit" > Submit </button > </div > </form > Here y'all see the three radio buttons, each with the proper name set to contact and each with a unique value that uniquely identifies that private radio push within the group. They each also have a unique id, which is used by the <characterization> element's for attribute to acquaintance the labels with the radio buttons.
You lot can try out this example hither:
Data representation of a radio group
When the above form is submitted with a radio button selected, the form's data includes an entry in the form contact=value. For instance, if the user clicks on the "Phone" radio push button then submits the form, the form's data will include the line contact=phone.
If you lot omit the value attribute in the HTML, the submitted form information assigns the value on to the group. In this scenario, if the user clicked on the "Phone" option and submitted the class, the resulting course data would be contact=on, which isn't helpful. And then don't forget to set your value attributes!
Note: If no radio button is selected when the form is submitted, the radio group is not included in the submitted form data at all, since there is no value to report.
It's fairly uncommon to really desire to allow the grade to be submitted without whatsoever of the radio buttons in a group selected, then it is unremarkably wise to have i default to the checked state. Run across Selecting a radio push by default below.
Let'southward add a footling flake of code to our example so we tin examine the information generated by this grade. The HTML is revised to add a <pre> cake to output the form data into:
<class > <p > Delight select your preferred contact method: </p > <div > <input type = "radio" id = "contactChoice1" proper name = "contact" value = "e-mail" > <label for = "contactChoice1" > Email </characterization > <input type = "radio" id = "contactChoice2" name = "contact" value = "telephone" > <characterization for = "contactChoice2" > Phone </label > <input blazon = "radio" id = "contactChoice3" name = "contact" value = "post" > <characterization for = "contactChoice3" > Mail service </label > </div > <div > <push button type = "submit" > Submit </button > </div > </form > <pre id = "log" > </pre > Then we add some JavaScript to set up an event listener on the submit event, which is sent when the user clicks the "Submit" push button:
var class = certificate. querySelector ( "form" ) ; var log = document. querySelector ( "#log" ) ; grade. addEventListener ( "submit" , function ( event ) { var data = new FormData (form) ; var output = "" ; for ( const entry of data) { output = output + entry[ 0 ] + "=" + entry[ 1 ] + "\r" ; } ; log.innerText = output; event. preventDefault ( ) ; } , faux ) ; Try this example out and meet how there's never more than one result for the contact group.
Additional attributes
In addition to the mutual attributes shared by all <input> elements, radio inputs support the following attributes.
-
checked -
A Boolean aspect which, if present, indicates that this radio button is the default selected one in the group.
Unlike other browsers, Firefox by default persists the dynamic checked state of an
<input>beyond page loads. Use theautocompleteaspect to command this feature. -
value -
The
valueattribute is one which all<input>s share; however, information technology serves a special purpose for inputs of typeradio: when a course is submitted, only radio buttons which are currently checked are submitted to the server, and the reported value is the value of thevalueattribute. If thevalueis non otherwise specified, it is the stringonpast default. This is demonstrated in the department Value to a higher place.
Using radio inputs
Nosotros already covered the fundamentals of radio buttons above. Let's now expect at the other common radio-button-related features and techniques you may need to know virtually.
Selecting a radio push button by default
To make a radio push selected by default, you lot include checked attribute, equally shown in this revised version of the previous example:
<form > <p > Delight select your preferred contact method: </p > <div > <input type = "radio" id = "contactChoice1" proper name = "contact" value = "email" checked > <characterization for = "contactChoice1" > Email </label > <input blazon = "radio" id = "contactChoice2" name = "contact" value = "phone" > <label for = "contactChoice2" > Phone </label > <input type = "radio" id = "contactChoice3" name = "contact" value = "post" > <characterization for = "contactChoice3" > Mail </label > </div > <div > <push button type = "submit" > Submit </button > </div > </form > In this example, the first radio button is now selected past default.
Annotation: If you put the checked attribute on more than one radio button, afterwards instances will override earlier ones; that is, the last checked radio button will exist the i that is selected. This is because but 1 radio push in a grouping tin can ever be selected at once, and the user agent automatically deselects others each time a new one is marked equally checked.
Providing a bigger hit area for your radio buttons
In the above examples, you may take noticed that you can select a radio button past clicking on its associated <label> element, as well as on the radio push itself. This is a actually useful characteristic of HTML form labels that makes it easier for users to click the option they want, especially on small-screen devices like smartphones.
Across accessibility, this is another good reason to properly fix up <label> elements on your forms.
Validation
Radio buttons don't participate in constraint validation; they have no real value to be constrained.
Styling radio inputs
The following example shows a slightly more thorough version of the instance we've seen throughout the article, with some additional styling, and with meliorate semantics established through use of specialized elements. The HTML looks similar this:
<form > <fieldset > <fable > Please select your preferred contact method: </legend > <div > <input blazon = "radio" id = "contactChoice1" name = "contact" value = "email" checked > <characterization for = "contactChoice1" > Email </label > <input type = "radio" id = "contactChoice2" proper noun = "contact" value = "telephone" > <label for = "contactChoice2" > Phone </label > <input type = "radio" id = "contactChoice3" proper name = "contact" value = "mail" > <label for = "contactChoice3" > Mail </characterization > </div > <div > <button type = "submit" > Submit </button > </div > </fieldset > </form > There's not much new to note here except for the addition of <fieldset> and <legend> elements, which aid to group the functionality nicely and in a semantic manner.
The CSS involved is a bit more significant:
html { font-family : sans-serif; } div:showtime-of-type { display : flex; align-items : flex-start; margin-bottom : 5px; } label { margin-right : 15px; line-height : 32px; } input { -webkit-appearance : none; -moz-appearance : none; appearance : none; border-radius : l%; width : 16px; tiptop : 16px; border : 2px solid #999; transition : 0.2s all linear; margin-right : 5px; position : relative; top : 4px; } input:checked { border : 6px solid black; } button, legend { color : white; background-color : blackness; padding : 5px 10px; border-radius : 0; border : 0; font-size : 14px; } button:hover, button:focus { color : #999; } button:active { groundwork-colour : white; color : black; outline : 1px solid black; } Most notable here is the use of the appearance property (with prefixes needed to back up some browsers). By default, radio buttons (and checkboxes) are styled with the operating system'southward native styles for those controls. By specifying appearance: none, you can remove the native styling birthday, and create your ain styles for them. Here we've used a edge along with border-radius and a transition to create a nice animative radio choice. Find also how the :checked pseudo-class is used to specify the styles for the radio push button's appearance when selected.
Note: If yous wish to employ the appearance holding, yous should examination it very carefully. Although it is supported in nigh modern browsers, its implementation varies widely. In older browsers, even the keyword none does non take the aforementioned effect across different browsers, and some practice not support information technology at all. The differences are smaller in the newest browsers.
Notice that when clicking on a radio button, there's a nice, smoothen fade out/in outcome every bit the two buttons alter state. In add-on, the style and coloring of the legend and submit push are customized to have strong contrast. This might not be a look you'd want in a real spider web application, merely it definitely shows off the possibilities.
Specifications
| Specification |
|---|
| HTML Standard # radio-button-land-(blazon=radio) |
Browser compatibility
BCD tables simply load in the browser
See also
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<input>and theHTMLInputElementinterface that implements information technology. -
RadioNodeList: the interface that describes a list of radio buttons - Compatibility of CSS backdrop
Source: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/radio
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