Default radio button option always first?

1. Should radio buttons always have a default selection?
2. How do I make the radio button selected by default?
3. How to set default radio button in javascript?
4. What is the default event for radio button control?

Should radio buttons always have a default selection?

Always Offer a Default Selection

One of the 10 heuristics of UI design says that users should be able to undo (and redo) their actions. This means enabling people to set a UI control back to its original state. In case of radio buttons this means that radio buttons should always have exactly one option pre-selected.

How do I make the radio button selected by default?

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> .

How to set default radio button in javascript?

None selected by default

In case we need to select a radio button by default, we need to check it as true. Whenever the radio buttons are checked as true, then it will be autofocused by default.

What is the default event for radio button control?

The CheckedChanged event is raised when the value of the Checked property changes. If the AutoCheck property is set to true (the default), when the radio button is selected all others in the group are automatically cleared.