public/subjects/mouse-trap-dom

Mouse trap

Instructions

Develop a trap to capture the elements when the mouse is getting too close to the center of the page!

• Create a function createCircle: make it fire on every click on the page, and create a div at the position of the mouse on the screen, setting its background to white and its class to circle

• Create a function moveCircle: make it fire when the mouse moves, and get the last circle created and makes it move along with the mouse

• Create a function setBox which sets a box with the class box in the center of the page ; when a circle is inside that box, it has to be purple (use the CSS global variable var(--purple) as background) ; once a circle enters the box, it is trapped inside and cannot go out of it anymore.

Hint: Be careful, a circle cannot overlap the box which has walls of 1px, it has to be trapped strictly inside.

Notions

• addEventListener(): click, mousemove
• removeEventListener()
• Mouse event: click, mousemove / clientX, clientY
• getBoundingClientRect()

Provided files

Files

You only need to create & submit the JS file mouse-trap.js ; we're providing you the following file to download (click right and save link) & test locally:

• the HTML file mouse-trap.html to open in the browser, which includes:

  • the JS script which will allow to run your code
  • some CSS pre-styled classes: feel free to use those as they are, or modify them

Expected result

You can see an example of the expected result here