Javascript Zoom In Zoom Out example

Last updated Sep 09, 2021

In this Javascript example tutorial we will cover basic Zoom in - Zoom out animation with java script. we applied this zoom animation on image by changing the width attribute values.

In this we used setInterval() method to call zoom-in/zoom-out functions. This setInterval method calls a function at specified intervals which we provided time in milliseconds.

This setInterval method calls until we need to call clearInterval()  method

 

Lets' get started about Javascript Zoom functionality

Step 1: Create an Html file by adding the Image inside div.

Step 2: Set id to the image as "zoom_id"

div style=" text-align: center; border: 1px solid rgba(0, 0, 0, 0.8);min-height:500px;">
        

id="zoom_id" src="images/heart.jpg" width="100"

style="margin-top:200px;"/>

/div>

 

In the above on image onmouseover and onmouseout attribute we called javascript functions to make image zoom-in and zoom-out functionality. So let's add javascript functions

 

Step 3:

script type="text/javascript">
        
        var width=100;
        var difference=2;
        var interveralID =0;
        

        function zoomIn()
        {
            clearInterval(interveralID);
            interveralID=setInterval(expand,15);
        }
        function zoomOut()
        {
            clearInterval(interveralID);
            interveralID=setInterval(shrink,15);
        }
        function expand()
        {
            if(width<200)
            {
                width = width+difference;
                document.getElementById("zoom_id").style.width=width;
                console.log(width);
            }
            else
            {
                clearInterval(interveralID);
            }
            
        }
        function shrink()
        {
            if(width>100)
            {
                width = width-difference;
                document.getElementById("zoom_id").style.width=width;
                console.log(width);
            }
            else
            {
                clearInterval(interveralID);
            }
            
        }
    
        /script>

 

Step 4: let's open file in your browser and move mouse on image, you will able to see zoom-in/zoom-out animation of the Image.

Javascript Zoom-in/Zoom-out animation

 

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