How To Get Browser Zoom Value In Jquery

In this blog post, we will learn how to get the browser zoom value using jQuery. This can be useful in various scenarios, such as adjusting the layout of your web page or performing certain actions when the user changes the zoom level.

Prerequisites

Before we start, make sure you have included the jQuery library in your project. You can either download it from the official jQuery website or include it using a CDN, like the one provided by Google:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

Getting the Browser Zoom Value

To get the browser zoom value, we can use the window.devicePixelRatio property. This property returns the ratio of the resolution in physical pixels to the resolution in CSS pixels for the current display device.

Here’s a simple example of how to get the browser zoom value using jQuery:

    $(document).ready(function() {
        var zoomValue = getBrowserZoomValue();
        console.log('Browser zoom value:', zoomValue);
    });

    function getBrowserZoomValue() {
        return window.devicePixelRatio;
    }
    

In the code above, we have created a function called getBrowserZoomValue() that returns the value of window.devicePixelRatio. We then call this function inside the $(document).ready() event to get the browser zoom value when the page is loaded.

Monitoring Zoom Level Changes

If you want to perform certain actions when the user changes the zoom level, you can use the window.onresize event. This event is triggered whenever the browser window is resized, which includes zoom level changes.

Here’s an example of how to monitor zoom level changes using jQuery:

    $(document).ready(function() {
        var initialZoomValue = getBrowserZoomValue();
        console.log('Initial browser zoom value:', initialZoomValue);

        $(window).on('resize', function() {
            var currentZoomValue = getBrowserZoomValue();

            if (currentZoomValue !== initialZoomValue) {
                console.log('Browser zoom value changed:', currentZoomValue);
                initialZoomValue = currentZoomValue;
            }
        });
    });

    function getBrowserZoomValue() {
        return window.devicePixelRatio;
    }
    

In the code above, we have added a window.onresize event listener that compares the initial zoom value with the current zoom value. If the values are different, it means the user has changed the zoom level, and we can perform any actions we need in response to this change.

Conclusion

In this blog post, we learned how to get the browser zoom value using jQuery and monitor zoom level changes. You can now use this information to adjust your web page layout or perform any other actions you need when the user changes the zoom level. Happy coding!