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JavaScript - onmousedown event example

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Created by:
Fletcher-Peralta
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In this article, we would like to show you onmousedown event example in JavaScript.

Quick solution:

var myElement = document.querySelector('#my-element');

myElement.addEventListener('mousedown', function() {
    console.log('onmousedown event occurred.');
});

or:

<div onmousedown="handleMousedown()"> div body here... </div>

or:

var myElement = document.querySelector('#my-element');

myElement.onmousedown = function() {
    console.log('onmousedown event occurred.');
};

Note:

The onmousedown is usually used with onmouseup event. Check examples below to see how they work.

 

Practical examples

There are three common ways how to use onmousedown event:

  • with event listener,
  • with element¬†attribute,
  • with element property.

1. Event listener based example

In this section, we want to show how to use onmousedown event on div element via event listener mechanism.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
  <head>
    <style>
      body {
        padding: 0 0 0 10px;
        height: 260px;
      }
      #square {
        padding: 10px;
        height: 120px;
        width: 120px;
        border-radius: 10px;
        background: #b5edc2;
        transition: 1.2s;
      }
    </style>
  </head>
  <body>
    <p>Press and hold the square with any mouse button:</p>
    <div id="square"/>
    <script>
      var mySquare = document.querySelector('#square'); // find element by id

      mySquare.addEventListener("mousedown", handleMouseDown); // add mousedown event

      function handleMouseDown(){
        mySquare.style.height = "200px";
        mySquare.style.width = "200px";
        mySquare.style.background = "#28a745";
      }
      
      mySquare.addEventListener("mouseup", handleMouseUp); // add mouseup event

      function handleMouseUp(){
        mySquare.style.height = "120px";
        mySquare.style.width = "120px";
        mySquare.style.background = "#b5edc2";
      }
    </script>
  </body>
</html>

2. Attribute based example

In this section, we want to show how to use onmousedown event on div element via attribute.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
  <head>
    <style>
      body {
        padding: 0 0 0 10px;
        height: 260px;
      }
      #square {
        padding: 10px;
        height: 120px;
        width: 120px;
        border-radius: 10px;
        background: #b5edc2;
        transition: 1.2s;
      }
    </style>
  </head>
  <body>
    <p>Press and hold the square with any mouse button:</p>
    <div id="square" onmousedown="handleMouseDown()" onmouseup="handleMouseUp()"/>
    <script>
      var mySquare = document.querySelector('#square'); // find element by id
      
      function handleMouseDown(){
        mySquare.style.height = "200px";
        mySquare.style.width = "200px";
        mySquare.style.background = "#28a745";
      }
      
      function handleMouseUp(){
        mySquare.style.height = "120px";
        mySquare.style.width = "120px";
        mySquare.style.background = "#b5edc2";
      }
    </script>
  </body>
</html>

3. Property based example

In this section, we want to show how to use onmousedown event on input element via property.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
  <head>
    <style>
      body {
        padding: 0 0 0 10px;
        height: 260px;
      }
      #square {
        padding: 10px;
        height: 120px;
        width: 120px;
        border-radius: 10px;
        background: #b5edc2;
        transition: 1.2s;
      }
    </style>
  </head>
  <body>
    <p>Press and hold the square with any mouse button:</p>
    <div id="square"/>
    <script>
      var mySquare = document.querySelector('#square'); // find element by id

      mySquare.onmousedown = function(){
        mySquare.style.height = "200px";
        mySquare.style.width = "200px";
        mySquare.style.background = "#28a745";
      }
      
      mySquare.onmouseup = function(){
        mySquare.style.height = "120px";
        mySquare.style.width = "120px";
        mySquare.style.background = "#b5edc2";
      }
    </script>
  </body>
</html>

JavaScript - events

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