Wilbert's website at SocSci

> jsPsych> A2 Timeline Variables

jspsych/A2timelinevars.html 2024-12-10
Test variable and looped timeline variables 
// classic, combine timeline and type
classic = {
	type: 'html-keyboard-response',
	timeline: [{stimulus: "c 0"}, {stimulus: "c 1"}],
}

text = {
	type: 'html-keyboard-response',
	stimulus: () => ("block: "+jsPsych.timelineVariable("block") +
		", stimulus: " + jsPsych.timelineVariable("stimulus"))
}

// nested timeline:
vars0 = [{stimulus:"a 0"}, {stimulus: "a 1"}]
vars1 = [{block: 0}, {block: 1}]

nestedBlock = {
	timeline: [text],
	timeline_variables: vars0,
}
block = {
	timeline: [nestedBlock],
	timeline_variables: vars1,
}

// dynamic timelines, use sampling function for this behaviour
indices = [0,1,0,1]
dynamic = {
	timeline: [text],
	//timeline_variables: () => [vars0[1], vars0[0]], // NOT ALLOWED, use sample
	timeline_variables: vars0, //
	sample: {
		type: 'custom',
		fn: (t) => indices.map((i) => t[i]) // t is the index array
	}
}




addEventListener("load", async () => {
	jsPsych.init({
		timeline: [classic, block, dynamic], // block/dynamic/classic
		on_finish: async function() {
			jsPsych.data.displayData()
		}
	})
})