Drag’n’Drop algorithm

Taiwo Fatokun answered on December 7, 2022 Popularity 2/10 Helpfulness 1/10

answer Drag’n’Drop algorithm

Drag’n’Drop algorithm

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ball.onmousedown = function(event) {
  // (1) prepare to moving: make absolute and on top by z-index
  ball.style.position = 'absolute';
  ball.style.zIndex = 1000;

  // move it out of any current parents directly into body
  // to make it positioned relative to the body
  document.body.append(ball);

  // centers the ball at (pageX, pageY) coordinates
  function moveAt(pageX, pageY) {
    ball.style.left = pageX - ball.offsetWidth / 2 + 'px';
    ball.style.top = pageY - ball.offsetHeight / 2 + 'px';
  }

  // move our absolutely positioned ball under the pointer
  moveAt(event.pageX, event.pageY);

  function onMouseMove(event) {
    moveAt(event.pageX, event.pageY);
  }

  // (2) move the ball on mousemove
  document.addEventListener('mousemove', onMouseMove);

  // (3) drop the ball, remove unneeded handlers
  ball.onmouseup = function() {
    document.removeEventListener('mousemove', onMouseMove);
    ball.onmouseup = null;
  };

};

Popularity 2/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: algorithm javascript

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Contributed on Dec 07 2022

Taiwo Fatokun

0 Answers Avg Quality 2/10

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