p5.js Element toggleClass() Method

Last Updated : 20 Nov, 2020

The toggleClass() of p5.Element in p5.js is used to toggle the specified class in the element. The toggling of a class means that it would be added or removed depending on the current state.

Syntax:

toggleClass(class)

Parameters: This function accepts a single parameter as mentioned above and described below:

class: It is a string that denotes the class to be toggled.

The example below illustrates the toggleClass() method in p5.js.

Example: The following HTML code shows the CSS styles that have to be added for the classes to show their effect. The p5.js elements can now use these classes.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <script src= 
"https://cdn.jsdelivr.net/npm/p5@0.10.2/lib/p5.js"> 
    </script> 
  
    <script src="sketch.js"></script> 
  
    <style> 
        .red { 
            background-color: red; 
        } 
  
        .border { 
            border: 10px dashed; 
        } 
    </style> 
</head> 
  
<body></body> 
  
</html> 

JavaScript code: The “sketch.js” file contains the p5.js code that demonstrates this method.

Javascript

function setup() { 
  canv = createCanvas(550, 300); 
  textSize(18); 
  
  text("Click on the buttons to toggle the " + 
       "given class of the canvas", 20, 30); 
  
  setBtn = createButton("Toggle Color"); 
  setBtn.position(30, 60); 
  setBtn.mouseClicked(toggleColor); 
  
  setBtn = createButton("Toggle Border"); 
  setBtn.position(160, 60); 
  setBtn.mouseClicked(toggleBorder); 
  
  canv.addClass("red"); 
  canv.addClass("border"); 
} 
  
function toggleColor() { 
  clear(); 
  
  // Toggle the given class 
  canv.toggleClass("red"); 
  text("The color class has been toggled", 30, 120); 
  text("Click on the buttons to toggle the " + 
       "given class of the canvas", 20, 30); 
} 
  
function toggleBorder() { 
  clear(); 
  
  // Toggle the given class 
  canv.toggleClass("border"); 
  text("The border class has been toggled", 30, 120); 
  
  text("Click on the buttons to toggle the " + 
       "given class of the canvas", 20, 30); 
} 