looping variable undefined

[mingjia1025]

@jodeleeuw

I'm trying to encapsulate my timeline nodes start_test (lines 490-494), testBlock (496 - 565) and end_test (567-583) as a looping timeline indexed by the variable iblock_test(defined in line 585) . The looping variable is referred to in all three of my component nodes but is only accessible for the testBlock and end_test. It's printed out as "undefined" on screen in the start_test node.

What might be causing this problem?

Here is my full experiment code on cognition.run:
https://qsk2df8eco.cognition.run

[jodeleeuw]

Hi @mingjia1025,

If you want to use a variable whose value changes during the experiment then you need to use dynamic (function) parameters.

var start_test = {
    type: 'html-button-response',
    stimulus: "",
    choices: function(){
	return ["Click here to begin test block " + String(iblock_test)]
    }
};