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Computer science · University

JavaScript and browser behaviour

A browser occurrence such as a click, input or key press.

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Prerequisites

Basic computer literacy.

Study notes

Event

A browser occurrence such as a click, input or key press.

DOM

The object representation of a document that scripts can inspect and change.

State

Data representing the current condition of an interface.

Validation

Checking input against expected rules before using it.

Worked examples

Which term best matches this description: A browser occurrence such as a click, input or key press.

Event is the matching concept in this lesson.

Event

Which term best matches this description: The object representation of a document that scripts can inspect and change.

DOM is the matching concept in this lesson.

DOM

Check your understanding

  1. Which concept would you apply first in a situation where data representing the current condition of an interface.

    1. DOM
    2. State
    3. Event
    4. Validation

  2. Name the concept described as: Checking input against expected rules before using it.

  3. Which statement about Event is most accurate?

    1. A browser occurrence such as a click, input or key press.
    2. The object representation of a document that scripts can inspect and change.
    3. Checking input against expected rules before using it.
    4. Data representing the current condition of an interface.

  4. Explain one important difference between Event and DOM.

Answers and marking guidance

Answers and marking notes
  1. State

    The scenario directly calls for State.

  2. Validation

    The intended concept is Validation.

  3. A browser occurrence such as a click, input or key press.

    The definition in the lesson notes gives the required condition.

  4. Event: A browser occurrence such as a click, input or key press. DOM: The object representation of a document that scripts can inspect and change.

    Credit a clear distinction using both definitions and an appropriate example if supplied.

Further reading and review references

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