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Showing content from https://www.geeksforgeeks.org/javascript/javascript-mouseevent-button-property/ below:

JavaScript MouseEvent Button Property - GeeksforGeeks

Last Updated : 11 Jul, 2025

The MouseEvent button property is used to define the left or right-click events. When the mouse button is clicked then it returns an integer value which describes the left, right, or middle mouse button. Syntax:

event.button

Return Value: This event returns an integer value on mouse click events are:

• 0: It indicates the left mouse button.
• 1: It indicates the middle mouse button.
• 2: It indicates the right mouse button.

The onmousedown event: This event occurs when a user presses a mouse button over an element. 

Example 1: 

<h1 style="color:green">
    GeeksforGeeks
</h1>
<h2>Mouse click event</h2>
<button onclick="click(event)">Click me</button>
<p id="demo"></p>
<script>
    document.onmousedown = click
    
    // click function called
    function click(event) {
        
        // Condition to disable left click
        if (event.button == 0) {
                document.getElementById("demo").innerHTML= "Left click not allowed"
        }
    }
</script>

Output: 

Example 2: 

<h1 style="color:green">
    GeeksforGeeks
</h1>
<h2>Mouse click event</h2>
<button onclick="click(event)">Click me</button>
<p id="demo"></p>
<script>
    document.onmousedown = click
    
    // click function called
    function click(event) {
        
        // Condition to disable left click
        if (event.button == 2) {
                document.getElementById("demo")
                          .innerHTML = "Right click not allowed";
        }
    }
</script>

Output: 

We have a complete list of Mouse Events, to check those please go through this HTML DOM MouseEvent article

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