I am using jQuery to add a div to a page that I’d want to then use as a location for content produced by another script (in this case ,p5). It will work fine if I assign include a static div with the id=’p5canvas’ but when I use jQuery to add dynamic content (see below), nothing happens and I don’t understand why. Can anyone explain what I am getting wrong/what’s missing?
main.php
<html> <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.4.1/p5.min.js"></script> <!-- and other stuff--> <button class="continueButton" id="btn3" value="blah"> Blah</button> <!-- and other stuff--></html>jQuery.js
$("#btn3").click(function(){ $("#contentbox3").load("graphic2.html"); $.getScript("animatebug.js");//a p5 animation});graphic2.html
<div id="p5canvas"></div>animatebug.js
function setup(){ createCanvas(400, 400); background(200,100,0); img = loadImage("images/bug_small.gif"); const myCanvas = createCanvas(400, 400); myCanvas.parent('p5canvas'); image(img, 0, 0);}function draw(){ background(200,100,0); image(img, 100, 100);}Advertisement
Answer
The order of execution is really important here, and that’s where things are going wrong. The p5 script in your header is looking for a setup() function to call at a time when you haven’t yet loaded your <div id="p5canvas"/> target element or your animatebug.js file containing the function.
You need to make sure that both of those two events happen — html loaded and script loaded — and then you can execute the script correctly.
You can control when the p5 functions are called by using p5 instance mode.
const animateBug = function(p) { let img; p.setup = function() { const myCanvas = p.createCanvas(400, 400); p.background(200, 100, 0); img = p.loadImage("https://www.gravatar.com/avatar/ddffc30b6adba9c402d2f6d8902c47fb?s=64&d=identicon&r=PG&f=1"); myCanvas.parent('p5canvas'); p.image(img, 0, 0); } p.draw = function() { p.background(200, 100, 0); p.image(img, 100, 100); }}Then you execute this by calling
new p5(animateBug);You’ll most likely want to call new p5(animateBug); in your jQuery so that you can make sure that load() and getScript() have both finished first. But I’m not a jQuery pro so I can’t help you with that part.