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How to Call Multiple JavaScript Functions in onClick Event

mhmadesk
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2022-05-18
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How to Call Multiple JavaScript Functions in onClick Event

JavaScript programming,
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mhmadesk
2022-05-18
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Use the addEventListener() Method

If you want to call or execute multiple functions in a single click event of a button, you can use the JavaScript addEventListener() method, as shown in the following example:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Call Multiple JavaScript Functions on Click of a Button</title>
</head> 
<body>
    <button type="button" id="myBtn">Click Me</button>
     
    <script>
    // Defining custom functions
    function sayHello(){
        alert("Hello World! sayHello() function executed successfully!");
    }
     
    function sayHi(){
        alert("Hi There! sayHi() function executed successfully!");
    }
     
    // Selecting button element
    var btn = document.getElementById("myBtn");
     
    // Assigning event listeners to the button
    btn.addEventListener("click", sayHello);
    btn.addEventListener("click", sayHi);
    </script>
</body>
</html>

See the tutorial on JavaScript event listeners to learn more attaching multiple event handlers.

Alternatively, you can also call more than one JavaScript function in one onclick event, like this:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Execute Two JavaScript Function in One onClick Event</title>
</head> 
<body>
    <script>
    // Defining custom functions
    function sayHello(){
        alert("Hello World! sayHello() function executed successfully!");
    }
     
    function sayHi(){
        alert("Hi There! sayHi() function executed successfully!");
    }
    </script>
    
    <button type="button" onclick="sayHello();sayHi();">Click Me</button>
</body>
</html>

The second method however looks simple and easy, but you should avoid placing JavaScript code directly inside HTML element. The first method is better and more preferable.

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