JavaScript Question of the Day March 4, 2025

The following program is supposed to allow a user to click on a graphic shape and move it to a new location on the canvas, but it’s not working properly. Choose the choice below that fixes the program.

function main() {
    mouseMoveMethod(changePosition);
}

function changePosition(e) {
    let element = getElementAt(e.getX(), e.getY());
    if (element != null) {
        element.setPosition(e.getX(), e.getY());
    }
}

// Assume there is additional code that creates one or more graphics objects

main();

1. Correct Answer
   Incorrect Answer
   a

   The if conditional on line 7 (and its bracket on line 9) need to be deleted in order for the position of element to actually be updated.

2. Correct Answer
   Incorrect Answer
   b

   Line 2 should be changed to mouseClickMethod(changePosition);

3. Correct Answer
   Incorrect Answer
   c

   Line 2 should be changed to mouseDownMethod(changePosition);

4. Correct Answer
   Incorrect Answer
   d

   Line 2 should be changed to mouseDragMethod(changePosition);