How to zoom-in and zoom-out image using JavaScript ?

Given an image and the task is to increase and decrease the image size using JavaScript. Use the following property to increase and decrease the image.

Using Width property: It is used to change the new values to resize the width of the element.

Syntax:

object.style.width = "auto|length|%|initial|inherit"

Approach:

  • Get the selector of the required image using .getElementById(selector).
  • Store the current width value in the variable using .clientWidth.
  • Now change the width value to new using .style.width.
  • It will proportionally increase and decrease the dimension of an image.

Example:



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<!DOCTYPE html>
<html>
  
<head>
    <title>
        How to zoom-in and zoom-out
        image using JavaScript ?
    </title>
      
    <script src=
"https://code.jquery.com/jquery-1.12.4.min.js">
    </script>
</head>
  
<body style="text-align:center;">
      
    <h1 style = "color:green;" > 
        GeeksForGeeks 
    </h1> 
      
    <h3>
        JavaScript | Increase and
        Decrease image size
    </h3>
    <hr>
      
    <div class="box">
          
        <img src=
"https://media.geeksforgeeks.org/wp-content/uploads/20190912174307/qwe1.png" 
            id="geeks" GFG="250" alt="Geeksforgeeks">
    </div>
    <hr>
      
    <button type="button" onclick="zoomin()">
        Zoom-In
    </button>
      
    <button type="button" onclick="zoomout()"> 
        Zoom-Out
    </button>
      
    <script type="text/javascript">
        function zoomin() {
            var GFG = document.getElementById("geeks");
            var currWidth = GFG.clientWidth;
            GFG.style.width = (currWidth + 100) + "px";
        }
          
        function zoomout() {
            var GFG = document.getElementById("geeks");
            var currWidth = GFG.clientWidth;
            GFG.style.width = (currWidth - 100) + "px";
        }
    </script>
</body>
  
</html>           

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Output:


    

  • Before click on button:
    

    • 

  • After click on Zoom-In Button:
    

    • 

  • After click on Zoom-Out Button:
    

    • 



Using Height property: It is used to change the new values to resize the height of the element.


Syntax:


object.style.height = "auto|length|%|initial|inherit"


Approach:


    

  • Get the selector of the required image using .getElementById(selector).
    • 

  • Store the current height value in the variable using .clientHeight.
    • 

  • Now change the width value to new using .style.height. 
    • 

  • It will proportionally increase and decrease the dimension of an image.
    • 



Example:











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















<!DOCTYPE html> 


<html> 


  


<head> 


    <title> 


        How to zoom-in and zoom-out 


        image using JavaScript ? 


    </title> 


      


    <script src= 


"https://code.jquery.com/jquery-1.12.4.min.js"> 


    </script> 


</head> 


  


<body style="text-align:center;"> 


      


    <h1 style = "color:green;" >  


        GeeksForGeeks  


    </h1>  


      


    <h3> 


        JavaScript | Increase and  


        Decrease image size 


    </h3> 


    <hr> 


      


    <div class="box"> 


        <img src= 


"https://media.geeksforgeeks.org/wp-content/uploads/20190912174307/qwe1.png"


                id="geeks" GFG="250" alt="Geeksforgeeks"> 


    </div> 


    <hr> 


      


    <button type="button" onclick="zoomin()">  


        Zoom-In 


    </button> 


      


    <button type="button" onclick="zoomout()">  


        Zoom-Out 


    </button> 


      


    <script type="text/javascript"> 


        function zoomin() { 


            var GFG = document.getElementById("geeks"); 


            var currHeight = GFG.clientHeight; 


                GFG.style.height = (currHeight + 40) + "px"; 


        } 


        function zoomout() { 


            var GFG = document.getElementById("geeks"); 


            var currHeight = GFG.clientHeight; 


                GFG.style.height = (currHeight - 40) + "px"; 


        } 


    </script> 


</body> 


  


</html> 



















                        chevron_right







                        filter_none








Output:


    

  • Before click on button:
    

    • 

  • After click on Zoom-In Button:
    

    • 

  • After click on Zoom-Out Button:
    

    • 



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