pool object not identified on javascript

patxelos · February 2022

Hi there,

I am trying to insert some javascript inline code on my experiment to be able run it online. In python I access my stimuli from the pool using the pool function (ie, path = pool[u'stimulus']), so I am trying to do the same on javascript as explained here (The pool object: Access to the file pool). However the command line prompts the following error:

js2py.internals.simplex.JsException: ReferenceError: pool is not defined

Find below a simplified version of my code. First in the prepare tab, I define the canvas object and the stimuli list that I will later use to index one stimulus on each trial:

persistent.img1 = Canvas()
let desirable_list = ["LT1.png", "LT2.png"]

After that in the run tab, I select the first stimulus from the list and then access it from the pool.

var imagen1 = desirable_list[1]
var path = pool[imagen1]
img1.image({fname: path, x: 250, y:0})
persistent.img1.show()

I would appreciate any help with this issue. Thanks!

best,

P Elosegi

patxelos · February 2022

Based on previous posts I have managed to fix the previous error and add a file to the pool from GitHub, but I think that I have some problems going on with the CORS policy.

Code prepare:

function addExternalImageToPool(url, name) {
    const img = new Image()
    img.crossOrigin = "anonymous"
    img.src = url
    const item = {
        data: img,
        type: "image",
        name: name
    }
    runner._pool.add(item)
}

addExternalImageToPool(
    "https://raw.githubusercontent.com/Patxelos/stimuli/main/LT1.png",
    "LT1.png"
)

var path = runner._pool['LT1.png'].name
persistent.img1 = Canvas()
persistent.img1.image({fname: path, x: 250, y: 0})

Code run:

persistent.img1.show()

Before this step I have a fixation routine that works fine but after the fixation a white screen pops up and I don't see any image:

Any hint of what could be going on here?

Best,

P

eduard · February 2022

Closed as duplicate of 7279

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