Log reaction time of key press + auto-advance

Hi there, I am trying to set up a multiple choice question with two answer options that does the following things: 1. The time it takes the respondent to make a decision is recorded (I do this by adding a timing question) 2. Instead of using the mouse, I want respondents to use either of two designated keys on the keyboard to log their response 3. The respondent should then advance automatically to the next question/block once they made a decision I found some code that should do exactly that (see below). However - for some reason I don't understand - it does the following things instead: 1. I need to select an answer with the mouse. Thus, pressing j or k in order to select an answer doesn't do the trick. 2. However, once I selected an answer with the mouse and I press either j or k, I do advance to the next question. What could be going wrong here and how can I fix it? Thanks so much in advance! Theresa Qualtrics.SurveyEngine.addOnload(function() { this.hideNextButton(); this.hidePreviousButton(); var that = this; Event.observe(document, 'keydown', function keydownCallback(e) { var choiceID = null; switch (e.keyCode) { case 74: // 'j' was pressed choiceID = 1; break; case 75: // 'k' was pressed choiceID = 2; break; } if (choiceID) { Event.stopObserving(document, 'keydown', keydownCallback); that.setChoiceValue(choiceID, true); that.clickNextButton(); } }); }); Source: https://sites.google.com/site/complexcognitionbgsu/data-collection-software/qualtricsadvanced