Web/API/Element/mouseup event

The mouseup event is fired at an Element when a button on a pointing device (such as a mouse or trackpad) is released while the pointer is located inside it. mouseup events are the counterpoint to mousedown events.

Bubbles	Yes
Cancelable	Yes
Interface	`MouseEvent`
Event handler property	`onmouseup`

Examples

The following example uses the mousedown, mousemove, and mouseup events to allow the user to draw on an HTML5 canvas. Its functionality is simple: the thickness of the line is set to 1, and the color is always black.

When the page loads, constants myPics and context are created to store a reference to the canvas and the 2d context we will use to draw.

Drawing begins when the mousedown event fires. First we store the x and y coordinates of the mouse pointer in the variables x and y, and then set isDrawing to true.

As the mouse moves over the page, the mousemove event fires. If isDrawing is true, the event handler calls the drawLine function to draw a line from the stored x and y values to the current location.

When the drawLine() function returns, we adjust the coordinates and then save them in x and y.

The mouseup event draws the final line segment, sets x and y to 0, and stops further drawing by setting isDrawing to false.

HTML

<h1>Drawing with mouse events</h1>
<canvas id="myPics" width="560" height="360"></canvas>

CSS

canvas {
  border: 1px solid black;
  width: 560px;
  height: 360px;
}

JavaScript

// When true, moving the mouse draws on the canvas
let isDrawing = false;
let x = 0;
let y = 0;

const myPics = document.getElementById('myPics');
const context = myPics.getContext('2d');

// event.offsetX, event.offsetY gives the (x,y) offset from the edge of the canvas.

// Add the event listeners for mousedown, mousemove, and mouseup
myPics.addEventListener('mousedown', e => {
  x = e.offsetX;
  y = e.offsetY;
  isDrawing = true;
});

myPics.addEventListener('mousemove', e => {
  if (isDrawing === true) {
    drawLine(context, x, y, e.offsetX, e.offsetY);
    x = e.offsetX;
    y = e.offsetY;
  }
});

window.addEventListener('mouseup', e => {
  if (isDrawing === true) {
    drawLine(context, x, y, e.offsetX, e.offsetY);
    x = 0;
    y = 0;
    isDrawing = false;
  }
});

function drawLine(context, x1, y1, x2, y2) {
  context.beginPath();
  context.strokeStyle = 'black';
  context.lineWidth = 1;
  context.moveTo(x1, y1);
  context.lineTo(x2, y2);
  context.stroke();
  context.closePath();
}

Result

Specifications

Specification

Status

UI EventsThe definition of 'mouseup' in that specification.

Working Draft

Document Object Model (DOM) Level 3 Events SpecificationThe definition of 'mouseup' in that specification.

Obsolete

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`mouseup` event	Chrome Full support 2	Edge Full support 12	Firefox Full support 6	IE Full support 9	Opera Full support 11.6	Safari Full support 4	WebView Android Full support ≤37	Chrome Android Full support 18	Firefox Android Full support 6	Opera Android Full support 12.1	Safari iOS Full support 3.2	Samsung Internet Android Full support 1.0

Legend

Full support: Full support