keyPressed()

A function that's called once when any key is pressed.

Declaring the function keyPressed() sets a code block to run once automatically when the user presses any key:

function keyPressed() {
  // Code to run.
}

The key and keyCode variables will be updated with the most recently typed value when keyPressed() is called by p5.js:

function keyPressed() {
  if (key === 'c') {
    // Code to run.
  }

  if (keyCode === 13) { // Enter key
    // Code to run.
  }
}

The parameter, event, is optional. keyPressed() is always passed a KeyboardEvent object with properties that describe the key press event:

function keyPressed(event) {
  // Code to run that uses the event.
  console.log(event);
}

Browsers may have default behaviors attached to various key events. For example, some browsers may jump to the bottom of a web page when the SPACE key is pressed. To prevent any default behavior for this event, add return false; to the end of the function.