Problems using Countdown Timer.

[RupertRiddle]

Hi guys,

I came across a countdown timer previously implemented by someone else on the forum, linked here: #1690

I am trying to integrate it into my code, but I get a typeError which says:
TypeError: trial.stimulus is not a function

Any ideas how to resolve this issue?

Best Wishes,
Rupert

[jodeleeuw]

Can you share a little more about the code you are using? Are you working with jsPsych v6 or v7?

[RupertRiddle]

Hi Joe thanks for getting back to me!

I'm using V7. I changed a few small things from the post, the exact code is:

`
var delay = {
type: jsPsychCanvasButtonResponse,
stimulus: '

The next part of the experiment will start in 1:00.',
choices: ['Continue'],
on_load: function(){
var wait_time = 1 * 60 * 1000; // in milliseconds
var start_time = performance.now();
document.querySelector('button').disabled = true;
var interval = setInterval(function(){
var time_left = wait_time - (performance.now() - start_time);
var minutes = Math.floor(time_left / 1000 / 60);
var seconds = Math.floor((time_left - minutes100060)/1000);
var seconds_str = seconds.toString().padStart(2,'0');
document.querySelector('#clock').innerHTML = minutes + ':' + seconds_str
if(time_left <= 0){
document.querySelector('#clock').innerHTML = "0:00";
document.querySelector('button').disabled = false;
clearInterval(interval);
}
}, 250)
}
}

`

[jodeleeuw]

The reason you are running into that error message is that you switched from the html-button-response plugin to the canvas-button-response plugin. The canvas plugin expects the stimulus property to be a function that will draw something on a canvas. Try changing the type to jsPsychHtmlButtonResponse.

[RupertRiddle]

Thanks that solved the problem - My mistake :)