p5.js. Alert is spammed

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I have made a program that draws a box, and when I click on it it changes color and alerts me that it has been clicked. But the alert won't stop. It just keeps alerting me even after I stopped clicking on it.

Here is the code:

function setup() {
    createCanvas(600, 800);
}


function draw() {
    background(170)
    fill(0, 0, 255)
    if(mouseX > 200 && mouseX < 260 && mouseY > 200 && mouseY < 225){
        fill(0, 0, 155)
    }
    rect(200, 200, 60, 25, 10)
    if(mouseX > 200 && mouseX < 260 && mouseY > 200 && mouseY < 225 && mouseIsPressed){
        alert("You have pressed a button!")
    }
}

Use mouseClicked function.

Like so:

function draw() {
    background(170)
    fill(0, 0, 255)
    if(mouseX > 200 && mouseX < 260 && mouseY > 200 && mouseY < 225){
        fill(0, 0, 155)
    }
    rect(200, 200, 60, 25, 10)
}

function mouseClicked() {
    if(mouseX > 200 && mouseX < 260 && mouseY > 200 && mouseY < 225){
        alert("You have pressed a button!")
    }
}

alert("message") causes issues · Issue #957 · processing/p5.js , MediaElement via createAudio(). ele = createAudio('assets/beat.mp3'); //We'll set up our example so that //when you click on the text, //an alert box displays the  p5.js is a JavaScript library for creative coding, with a focus on making coding accessible and inclusive for artists, designers, educators, beginners, and anyone else! p5.js is free and open-source because we believe software, and the tools to learn it, should be accessible to everyone.

mouseIsPressed has some known issues on some browsers. For the best reliability, use mousePressed() by changing this:

if(mouseX > 200 && mouseX < 260 && mouseY > 200 && mouseY < 225 && mouseIsPressed){
    alert("You have pressed a button!")
  }

to this:

function mousePressed() {
  if (mouseX > 200 && mouseX < 260 && mouseY > 200 && mouseY < 225) {
    alert("You have pressed a button!")
    return false
  }
}

mousePressed() will fire every time the mouse is clicked.

More information is available in the API Reference.

Since another answer was posted at about the same time, here is some information on using mousePressed() vs mouseClicked().

I've personally had some of the issues they mention and can attest that mousePressed() tends to be more reliable, and would only use mouseClicked() if it is vital that you capture BOTH the press and release actions.

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[JS] dialogue alert spam. - Programming, a sentence, the function is a verb and the arguments are the objects of the of a Processing window, you must alert Processing to this activity. used for text analysis applications such as spam filtering or sentiment analysis. Going back to the question. Processing.js was used to convert & run Processing .pde files in a web browser, whilst when using p5.js you will be writing your code directly in JavaScript. p5.js isn't as fully featured as Processing but it is under active development and continues to grow.

[PDF] p5 Documentation, See also vector spaces Space Invaders (video game), 175 spam, 6, 3, 11–12, 18, 23 TEI (Text Encoding Initiative), 122, 135–36, 218; P5 Guidelines, 135 210​; Romantic, in Wordsworth, 203–12; and smartphone “alerts,” 188; vs. sociality in sense See also timelines Timeglider.js, 183 timeline, Eusebius's (time tables),​  One of the core ideas behind p5.js is that your sketch is not just the graphics canvas but the whole web page in your browser. For this reason, there is the p5.dom library that makes it easy to interact with other HTML5 objects, including text, hyperlink, image, input, video, audio, and webcam. There is also a p5.sound library that provides a

Comments
  • Keep in mind that the draw() function is called constantly.
  • ok thanks, but why the " alert == 0" and "return false". And what do they do?
  • @Sanity I'm sorry, edited answer. I was planning to add a flag to help cover all your bases if something else was wrong. It was a variable named 'alert' with value 0 for no alert showing and value 1 for alert showing. I removed it to address problems one at a time, but missed that reference. return false overrides browser defaults for click-related actions. It just makes your function the priority.