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A radio button is an element of the graphical user interface (GUI) which allows a user to select a single item from a predefined list of options. Radio buttons are often arranged in a group of at least two options.

Radio buttonThe 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> .

Selecting a radio button by default In this case, the first radio button is now selected by default. 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.

Input Radio checked PropertyCheck and un-check a specific radio button: function check() {Find out if a radio button is checked or not: getElementById("myRadio").Use a radio button to convert text in an input field to uppercase: getElementById("fname").Several radio buttons in a form: var coffee = document.

Input Radio value PropertyGet the value of the value attribute of a radio button: getElementById("myRadio").Change the value of the value attribute of a radio button: getElementById("myRadio").Using radio buttons together with a text input field to display the value of the selected radio button:

Radio buttonThe 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> .

Use document. getElementById('id'). checked method to check whether the element with selected id is check or not. If it is checked then display its corresponding result otherwise check the next statement.