How to check whether the background image is loaded or not using JavaScript ?

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In this article, we will check whether the background image is loaded or not using JavaScript. In JavaScript, onload event is used to check whether a window is loaded or not. Similarly, we can use that event to check whether a particular element has loaded or not. There are two ways in which we can check whether a background image has loaded or not.

We can do this in three ways:

Using HTML
Using the onload attribute in Javascript
Using addEventListener() method

Using HTML:

Syntax:

<element onload="myScript">

Example: This example checks whether the background image is loaded or not using Html.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
"https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"> 
    </script> 
  
    <style> 
        #bg_img { 
            width: 50vw; 
            height: 50vh; 
        } 
    </style> 
</head> 
  
<body> 
    <h2>Welcome To GFG</h2> 
  
    <p> 
        Default code has been  
        loaded into the Editor. 
    </p> 
      
    <img id="bg_img" onload="loadImage()" /> 
      
    <p id="img_status"></p> 
      
    <script> 
        function loadImage() { 
            document.getElementById("img_status") 
                    .innerHTML = "image loaded"; 
        } 
        document.getElementById("bg_img").src = 
"https://media.zambiatek.com/wp-content/uploads/zambiatek-6.png"; 
  
        let ele = document.getElementById("bg_img"); 
    </script> 
</body> 
  
</html> 

Output:

Using onload attribute in JavaScript:

Syntax:

object.onload = function(){myScript};

Example: This example checks whether the background image is loaded or not using onload attribute in Javascript.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
"https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"> 
    </script> 
      
    <style> 
        #bg_img { 
            width: 50vw; 
            height: 50vh; 
        } 
    </style> 
</head> 
  
<body> 
    <h2>Welcome To GFG</h2> 
  
    <p> 
        Default code has been  
        loaded into the Editor. 
    </p> 
      
    <img id="bg_img" /> 
      
    <p id="img_status"></p> 
      
    <script> 
        let ele = document.getElementById("bg_img"); 
        ele.onload = (e) => { 
            document.getElementById("img_status") 
                    .innerHTML = "image loaded"; 
        }; 
        ele.src =  
"https://media.zambiatek.com/wp-content/uploads/zambiatek-6.png"; 
    </script> 
</body> 
  
</html> 

Output:

Using addEventListener() method in JavaScript

Syntax:

object.addEventListener("load", myScript);

Example: This example checks whether the background image is loaded or not using the addEventListener() method in Javascript.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <style> 
        #bg_img { 
            width: 50vw; 
            height: 50vh; 
        } 
    </style> 
</head> 
  
<body> 
    <h2>Welcome To GFG</h2> 
  
    <p> 
        Default code has been  
        loaded into the editor 
    </p> 
      
    <img id="bg_img" /> 
      
    <p id="img_status"></p> 
      
    <script src= 
"https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"> 
    </script> 
      
    <script> 
        let ele = document.getElementById("bg_img"); 
        ele.addEventListener("load", (e) => { 
            document.getElementById("img_status") 
                    .innerHTML = "image loaded"; 
        }); 
  
        ele.src = 
"https://media.zambiatek.com/wp-content/uploads/zambiatek-6.png"; 
    </script> 
</body> 
  
</html> 

Output:

Note: To use jQuery replace the event listener code with the following –

$("#bg_img").on("load", function () {
  window.alert("Image has loaded", 1);
});

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