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p5.js | createButton() Function

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  • Last Updated : 11 Jul, 2019

The createButton() function is used to create a button element in the DOM (Document Object Model). The .size() function is used to set the size of button element. The .mousePressed() function is used to specify the behavior of mouse button when pressing it.
Note: This function requires the p5.dom library. So add the following line in the head section of the index.html file.

Syntax:

createButton( label, value )

Parameters: This function accepts two parameters as mentioned above and described below:

  • label: This parameter holds the label displayed on the button.
  • value: This parameter holds the value of the button.

Return Value: It returns a pointer element holding the created node object.

Note: This button element can be linked with various JavaScript events like mouse pressed, mouse clicked, mouse released, etc.

Example: This example uses createButton() function to change the background color using the p5.js button element.




// Create a variable for button object
var color_button;
   
// Create a function to change the background-color
function change_background() {
      
    // Pick a random number for r value
    r = random(255);
      
    // Pick a random number for g value
    g = random(255);
      
    // Pick a random number for b value
    b = random(255);
      
    // Set a random background-color
    background(r, g, b);
}
   
function setup() {
      
    // Create a canvas
    createCanvas(400, 400);
      
    // Set an initial background-color
    background(50);
      
    // Create the button
    color_button = createButton("Change Color");
      
    // Position the button
    color_button.position(150, 200);
      
    // When the button is clicked change_background()
    // function is called
    color_button.mouseClicked(change_background);
}

Output:

  • After clicking the button:
  • After clicking the button again:

Reference: https://p5js.org/reference/#/p5/createButton


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