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JavaScript Events — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript Events lesson. Every one is checked automatically in the browser — write the code, run it, and the tests tell you what still fails.

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Exercises(5)

  1. 1

    Handle a click

    easy10 min

    When the button is clicked, put Clicked into #out.

  2. 2

    Count the clicks

    easy10 min

    Show how many times the button has been clicked.

  3. 3

    Use a named handler

    easy10 min

    Define a named function and attach it as the click handler.

  4. 4

    Handle two buttons

    easy10 min

    Make each button report its own name when clicked.

  5. 5

    Read a value on click

    medium10 min

    When the button is clicked, show the value of the input.

Find the bug(5)

  1. 1

    Fix the handler called immediately

    easy8 min

    Brackets run the function instead of passing it to the listener.

  2. 2

    Fix the on prefix in the event name

    easy8 min

    addEventListener takes click, not onclick.

  3. 3

    Fix the listener on the wrong element

    easy8 min

    The listener was attached to the output instead of the button.

  4. 4

    Fix the counter reset each time

    easy8 min

    Declaring the count inside the handler resets it on every click.

  5. 5

    Fix the second onclick overwriting the first

    easy8 min

    The onclick property holds only one handler.

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