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JavaScript Page Load Events — exercises and bug fixes

5 hands-on exercises and 5 find-the-bug challenges for the JavaScript Page Load 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

    Wait for the DOM

    easy10 min

    Report Ready from inside a DOMContentLoaded handler.

  2. 2

    Wait for everything

    easy10 min

    Report Loaded from inside a window load handler.

  3. 3

    Check the ready state

    easy10 min

    Report valid state when readyState is one of the three values it can hold.

  4. 4

    Find an element after loading

    easy10 min

    Read the heading from inside a DOMContentLoaded handler.

  5. 5

    Run in the right order

    medium10 min

    Report the order DOMContentLoaded and load fire in.

Find the bug(5)

  1. 1

    Fix the value read before the handler ran

    easy8 min

    The result is read outside the handler, before the event has fired.

  2. 2

    Fix load listened for on document

    easy8 min

    The load event is fired on window.

  3. 3

    Fix the misspelled event name

    easy8 min

    The name is DOMContentLoaded, with that exact spelling.

  4. 4

    Fix the readyState compared wrongly

    easy8 min

    There is no ready state; the values are loading, interactive and complete.

  5. 5

    Fix the order recorded wrongly

    easy8 min

    DOMContentLoaded fires before load, not after it.

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