plugin.trial = function()

in datawig-js/static/jspsych-6.1.0/plugins/jspsych-image-button-response.js [98:221]

• 59 lines of code
• 15 McCabe index (conditional complexity)

  plugin.trial = function(display_element, trial) {

    // display stimulus
    var html = '<img src="'+trial.stimulus+'" id="jspsych-image-button-response-stimulus" style="';
    if(trial.stimulus_height !== null){
      html += 'height:'+trial.stimulus_height+'px; '
      if(trial.stimulus_width == null && trial.maintain_aspect_ratio){
        html += 'width: auto; ';
      }
    }
    if(trial.stimulus_width !== null){
      html += 'width:'+trial.stimulus_width+'px; '
      if(trial.stimulus_height == null && trial.maintain_aspect_ratio){
        html += 'height: auto; ';
      }
    }
    html +='"></img>';

    //display buttons
    var buttons = [];
    if (Array.isArray(trial.button_html)) {
      if (trial.button_html.length == trial.choices.length) {
        buttons = trial.button_html;
      } else {
        console.error('Error in image-button-response plugin. The length of the button_html array does not equal the length of the choices array');
      }
    } else {
      for (var i = 0; i < trial.choices.length; i++) {
        buttons.push(trial.button_html);
      }
    }
    html += '<div id="jspsych-image-button-response-btngroup">';

    for (var i = 0; i < trial.choices.length; i++) {
      var str = buttons[i].replace(/%choice%/g, trial.choices[i]);
      html += '<div class="jspsych-image-button-response-button" style="display: inline-block; margin:'+trial.margin_vertical+' '+trial.margin_horizontal+'" id="jspsych-image-button-response-button-' + i +'" data-choice="'+i+'">'+str+'</div>';
    }
    html += '</div>';

    //show prompt if there is one
    if (trial.prompt !== null) {
      html += trial.prompt;
    }

    display_element.innerHTML = html;

    // start timing
    var start_time = performance.now();

    for (var i = 0; i < trial.choices.length; i++) {
      display_element.querySelector('#jspsych-image-button-response-button-' + i).addEventListener('click', function(e){
        var choice = e.currentTarget.getAttribute('data-choice'); // don't use dataset for jsdom compatibility
        after_response(choice);
      });
    }

    // store response
    var response = {
      rt: null,
      button: null
    };

    // function to handle responses by the subject
    function after_response(choice) {

      // measure rt
      var end_time = performance.now();
      var rt = end_time - start_time;
      response.button = choice;
      response.rt = rt;

      // after a valid response, the stimulus will have the CSS class 'responded'
      // which can be used to provide visual feedback that a response was recorded
      display_element.querySelector('#jspsych-image-button-response-stimulus').className += ' responded';

      // disable all the buttons after a response
      var btns = document.querySelectorAll('.jspsych-image-button-response-button button');
      for(var i=0; i<btns.length; i++){
        //btns[i].removeEventListener('click');
        btns[i].setAttribute('disabled', 'disabled');
      }

      if (trial.response_ends_trial) {
        end_trial();
      }
    };

    // function to end trial when it is time
    function end_trial() {

      // kill any remaining setTimeout handlers
      jsPsych.pluginAPI.clearAllTimeouts();

      // gather the data to store for the trial
      var trial_data = {
        "rt": response.rt,
        "stimulus": trial.stimulus,
        "button_pressed": response.button
      };

      // clear the display
      display_element.innerHTML = '';

      // move on to the next trial
      jsPsych.finishTrial(trial_data);
    };



    // hide image if timing is set
    if (trial.stimulus_duration !== null) {
      jsPsych.pluginAPI.setTimeout(function() {
        display_element.querySelector('#jspsych-image-button-response-stimulus').style.visibility = 'hidden';
      }, trial.stimulus_duration);
    }

    // end trial if time limit is set
    if (trial.trial_duration !== null) {
      jsPsych.pluginAPI.setTimeout(function() {
        end_trial();
      }, trial.trial_duration);
    }

  };