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Radio buttons, also called option buttons, let users select one option from a collection of two or more mutually exclusive, but related, options. Radio buttons are always used in groups, and each option is represented by one radio button in the group.

To allow only one radio button to be checked from a bunch of radio buttons, make the name of all radio button same. For example the below code has 3 radio button but only one radio button can be checked: <input type="radio" name="gender" value="male" id="mRadio"> Male<br>

First we will create an interface which represents mat-radio-button options. Now lets add some random radio button options. In the above ma-radio-button options, I am setting the first option checked property to true . That means, the first option will be selected by default.

Use the querySelector() method to check whether a radio button is selected. Programmers can use JavaScript's querySelector() method to select any HTML element. Here, we have used the querySelector() method to select only the checked radio button. If no radio button is selected, it returns a null value.

To set a radio button to checked/unchecked, select the element and set its checked property to true or false , e.g. myRadio. checked = true . When set to true , the radio button becomes checked and all other radio buttons with the same name attribute become unchecked.

In order to create a radio button, we need to define the input element and assign it to a variable called input. Then, change its input type to radio. Finally, append the input element to the label element.

Radio button The radio class is a simple wrapper around the <input type="radio"> HTML elements. ... You can check a radio button by default by adding the checked HTML attribute to the <input> element. ... You can disable a radio button by adding the disabled HTML attribute to both the <label> and the <input> .