Using timeline variable in anonymous functions in v8

[holgerMitterer]

I am just preparing my first experiment in v8, and I often generate prompts for audio-keyboard responses with a mixture of static and dyamic texts, like in the following:

`
var cloze_trial = {

type: jsPsychAudioKeyboardResponse,
stimulus: jsPsych.timelineVariable('sound'),
choices: ['q', 'p'],
prompt: function () { 
    var trialChoices = "<p>Q: ";
    var leftOption  = jsPsych.timelineVariable('option_1', true);
    var rightOption = jsPsych.timelineVariable('option_2', true);
    console.log(leftOption);
    trialChoices = trialChoices + leftOption + "............................P: " + rightOption  + "</p>" ;
    console.log(trialChoices);
    return(trialChoices)
},
response_ends_trial: true

};`

In v8, the prompt looks like this (the timeline seems to work, the sound is playing):

Q: [object Object]............................P: [object Object]

I re-migrated the experiment to v7.3.3 and there it seemed to work, I get:

Q: contanto............................P: contanta
(with these two words provided by the timeline.

How has the usge of timeline variables in anonymous functions changed between v7 and v8?

Kind regards,
Holger

[Shaobin-Jiang]

Use evaluateTimelineVariable in a function. See here.