How could I pause the trial if participants choose wrong items in survey?

[Tongzhao9417]

Hi, I come to here to discuss the question that I open an issue but no one answered (#3159)

I'm writing a comprehension quiz by survey plugin, and I found the participants could continue if they chose incorrect option. My requirement is the trial will stop until the participant change their choice. Is there any method to achieve it?

[Tongzhao9417]

Aha, I found a solution again and I will share it for future reference: If you, like me, need participants to answer comprehension tests and cannot proceed with the experiment if there are errors in the test, then you can try Looping timelines. Specifically, I put the variables of the timeline into an export loop and query data.accuracy in the loop_function. If false is included in this accuracy array, then Return true and use alert to inform the participant which question has an error. Here are some examples:

export const comprehension_survey_results = {
    timeline:[comprehension_survey],
    loop_function:function(data){
        let accuracy = data.trials[0].accuracy
        let answers_array:any[] = []
        accuracy.forEach((element,index) => {
            let answers = Object.values(element)
            let answers_index = index
            answers.forEach((answer)=>{
                if (answer == false) {
                    answers_array.push(answers_index+1)
                }
            })
            
        });
        if (answers_array.length !== 0){
            alert('The incorrect items are' + answers_array+'！Please reanswer it again！')
            return true
        }else if (answers_array.length == 0) {
            return false
        }
    }
}