What is Radio Button Element in HTML
Radio buttons let a user select ONLY ONE of a limited number of choices. It is defined as <input type="radio"> and has three main attributes - name, value, and checked. The name is sent along with the selected value to the server. The value attribute is the value passed to a script or a CGI program to indicate which button is selected. Be sure you assign a different value to each button. The checked attribute sets a default value when the page loads into the browser and is used with only one radio button in a group.
The entire group of radio buttons shares a single name and a single object. To access the individual buttons, you treat the radio object as an array. The buttons are indexed, starting with 0. You use the checked property of a radio button to check its current state. The following statement checks the first radio button in the ctype group on the contact form:
document.contact.ctype[0].checked == true;
Learn the HTML5 language in this tutorial series. These tutorials are designed for new programmers to provide them thorough knowledge of full stack web development.
