How to change the image source attribute using Javascript

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In this easy tutorial i will be showing you how JavaScript changes the value of the src (source) attribute of an img tag.JavaScript can change any kind of HTML element on a webpage because it has One of many JavaScript HTML methods called getElementById().

This example uses the method to find an HTML element with id="bulb" and changes the image src (source) attribute to a given image.

Absorbing this amount of content would be alot if you are just reading it,so i have put together a very simple video for you to understand the code below.

Simple HTML code - copy to text Editor

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<!DOCTYPE html>
<html>
   <head>
        <title>Javascript</title>
        <style>
            .container{
                display:flex;
                height:100vh;
            }
            
            .controllers{
                margin:auto;
            }
       </style>
   </head>
    
  <body>
        

       <div class="container">
                    
           <div class="controllers">
                  <button id="On">Switch on</button>
                
                <img id="bulb">
                
                <button id="Off">Switch off</button>
          </div>
            
       </div>
        

    </body>
 </html>

Javascript Code

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//Initialize the default bulb
document.getElementById('bulb').src='img/bulboff.gif';
        
//Grab on the switch on btn and add an event(click)
document.getElementById('On').addEventListener('click',switchOn);
        
//Grab on the switch off btn and add an event(click)
document.getElementById('Off').addEventListener('click',switchOff);
        
//Runs when the switch on button is clicked
function switchOn(){
    let On = document.getElementById('bulb');
    On.src = 'img/bulbon.gif';
}

//Runs when the switch off button is clicked
function switchOff(){
    let Off = document.getElementById('bulb');
    Off.src = 'img/bulboff.gif';
}