GlobalEventHandlers.onmousemove

The onmousemove property of the GlobalEventHandlers mixin is an event handler that processes mousemove events.

The mousemove event fires when the user moves the mouse.

Syntax

target.onmousemove = functionRef;

Value

functionRef is a function name or a function expression. The function receives a MouseEvent object as its sole argument.

Examples

Tooltips

This example creates link tooltips that follow your mouse. It uses the onmousemove, onmouseover, and onmouseout event handlers.

HTML

<p><a href="#" data-tooltip="First link">See a tooltip here &hellip;</a></p>
<p><a href="#" data-tooltip="Second link">&hellip; or here!</a></p>

CSS

.tooltip {
  position: absolute;
  z-index: 9999;
  padding: 6px;
  background: #ffd;
  border: 1px #886 solid;
  border-radius: 5px;
}

JavaScript

const tooltip = new (function() {
  const node = document.createElement('div');
  node.className = 'tooltip';
  node.setAttribute('hidden', '');
  document.body.appendChild(node);

  this.follow = function(event) {
    node.style.left = event.clientX + 20 + 'px';
    node.style.top = event.clientY + 10 + 'px';
  };

  this.show = function(event) {
    node.textContent = event.target.dataset.tooltip;
    node.removeAttribute('hidden');
  };

  this.hide = function() {
    node.setAttribute('hidden', '');
  };
})();

const links = document.querySelectorAll('a');

links.forEach(link => {
  link.onmouseover = tooltip.show;
  link.onmousemove = tooltip.follow;
  link.onmouseout = tooltip.hide;
});

Result

Draggable elements

We also have an example available showing the use of the onmousemove event handler with draggable objects — view the example in action.

Specifications

Specification
HTML Standard # handler-onmousemove

Browser compatibility

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