JavaScript - Convert Hex To RGB

Submitted by razormist on Thursday, August 29, 2019 - 15:36.

In this tutorial we will create a Convert Hex To RGB using JavaScript. This code will dynamically convert a hex format into RGB color code when user click the button. The code use onclick() to call a function that convert given hex format into RGB using charAt() to strip the string in two's in order to transform each parts into a number format. You can apply this script to your code to make your transaction faster, it is a user-friendly program feel free to modify it. We will use JavaScript to add some new feature to the website interface by actually written into an HTML page. It is what gives your page a different interactive elements and animation that engage a user.

Getting Started:

This is the link for the bootstrap that i used for the layout design https://getbootstrap.com/.

The Main Interface

This code contains the interface of the application. To create this just write these block of code inside the text editor and save this as index.html.

<!DOCTYPE html>
<html lang="en">
        <head>
                <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
                <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
        </head>
<body>
        <nav class="navbar navbar-default">
                <div class="container-fluid">
                        <a href="https://sourcecodester.com" class="navbar-brand">Sourcecodester</a>
                </div>
        </nav>
        <div class="col-md-3"></div>
        <div class="col-md-6 well">
                <h3 class="text-primary">JavaScript - Convert Hex To RGB</h3>
                <hr style="border-top:1px dotted #ccc;"/>
                <div class="col-md-4">
                        <h4>HEX</h4>
                        <input type="text" id="hex" class="form-control" placeholder="#"/>
                        <br />
                        <center><button type="button" class="btn btn-primary" onclick="convert()">Convert</button></center>
                </div>
                <div class="col-md-8">
                        <div class="form-inline">
                                <h4>RGB</h4>
                                <label>R:</label>
                                <input type="number" id="r" class="form-control" style="width:20%;" min="0" max="255" readonly="readonly"/>
                                <label>G:</label>
                                <input type="number" id="g" class="form-control" style="width:20%;" min="0" max="255" readonly="readonly"/>
                                <label>B:</label>
                                <input type="number" id="b" class="form-control" style="width:20%;" min="0" max="255" readonly="readonly"/>
                        </div>
                </div>
        </div>
<script src="js/script.js"></script>
</body>
</html>

Creating the Script

This code contains the script of the application. This code will convert hex into RGB format when the button is clicked. To do this just copy and write these block of codes as shown below inside the text editor and save it as script.js inside the js directory

function convert(){
        var hex=document.getElementById('hex');
        
        if(hex.value.length == 6){
                hexToRgb("#"+hex.value);
        }else{
                alert("Must be 6 length!");
        }
        
}
 
function hexToRgb(h){
        var r = parseInt((cutHex(h)).substring(0,2),16);
        var g = parseInt((cutHex(h)).substring(2,4), 16);
        var b = parseInt((cutHex(h)).substring(4,6),16);
        return document.getElementById('r').value = r, document.getElementById('g').value = g, document.getElementById('b').value = b;
}
function cutHex(h){
        return (h.charAt(0)=="#") ? h.substring(1,7):h
}

There you have it we successfully created a Convert Hex To RGB using JavaScript. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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