Change Text Color Based On Background Color Using Javascript

Websolutionstuff | Dec-25-2020 | Categories : PHP jQuery CSS HTML

In this article, we will see a change text color based on background color using javascript. Sometimes we have requirements to change text or font color dependent on background color and at that time if you are changing text color manually then this post will definitely help you. So, you can change font color dynamically based on background color using jquery.

So, let's see how to dynamically change text color based on a background color javascript and jquery change text color based on background.

Create HTML File

In this step, we will create an HTML file and add the below code.

<html> 
  
<head> 
    <title> 
        How to change text color depending  
      on background color using JavaScript
    </title> 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"> 
    </script> 
    
</head> 
  
<body id="body" align="center" > 
    <h1 style="color:#03aa96;">   
            Websolutionstuff.com  
        </h1> 
    <p id="col_UP" style="font-size: 15px; font-weight: bold;"> </p> 
    <button onclick="col_Fun()">
        click here 
    </button> 
    <br> 
    <br> 
    <div id="backG">Welcome to websolutionstuff.</div> 
    
</body> 
  
</html>

Read Also: Laravel AJAX CRUD example

Add CSS For Designing

Now, add CSS to add a head tag.

#backG { 
    width: 200px; 
    height: 30px; 
    color: white; 
    background: #03aa96; 
    margin: 0 auto;
    padding-top:10px;
  }

Add Javascript Code

In this step, we will create a jquery function and change the text color based on the background color selection.

var el_up = document.getElementById('col_UP'); 
var rgbValue = [255, 0, 0]; 
 

function setColor() { 
    rgbValue[0] = Math.round(Math.random() * 255); 
    rgbValue[1] = Math.round(Math.random() * 255); 
    rgbValue[2] = Math.round(Math.random() * 255); 
    var color = Math.round(((parseInt(rgbValue[0]) * 299) + 
        (parseInt(rgbValue[1]) * 587) + 
        (parseInt(rgbValue[2]) * 114)) / 1000); 
    var textColor = (color > 125) ? 'black' : 'white'; 
    var backColor =  
        'rgb(' + rgbValue[0] + ', ' + rgbValue[1] + ', ' 
     + rgbValue[2] + ')'; 
      
    $('#backG').css('color', textColor); 
    $('#backG').css('background-color', backColor); 
} 

function col_Fun() { 
    setColor(); 
}

Output: