Prevent default

Read first Task 28

event.preventDefault() stops a form reloading the page.

Definition and example

Prevent default is the focus of this lesson. event.preventDefault() stops a form reloading the page. The task asks you to apply that idea in a small example: Which stops the browser's default action. Before you run the code, predict what should happen. Then Inspect the browser output and the value your code produces and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.

JavaScript 1 automatic check The DOM

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// TASK prevent-default-08: Which stops the browser's default action?
// STEPS: Read the explanation. Change one relevant line at a time, then run the code and compare the result with the check on the right.
console.log(typeof window.addEventListener);

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Your result

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Checks on this task:

The output must include “function”.

The task and step-by-step instructions are written as comments at the top of the editor. Change one relevant line, run it, and compare the result with these checks.

Incorrect attempts before answer: 0 / 3

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Prevent default

Prevent default

Why this works