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PCSurvey/PCstatic/js/plugins/jspsych-image-keyboard-response.js

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+/**
+ * jspsych-image-keyboard-response
+ * Josh de Leeuw
+ *
+ * plugin for displaying a stimulus and getting a keyboard response
+ *
+ * documentation: docs.jspsych.org
+ *
+ **/
+
+
+jsPsych.plugins["image-keyboard-response"] = (function() {
+
+  var plugin = {};
+
+  jsPsych.pluginAPI.registerPreload('image-keyboard-response', 'stimulus', 'image');
+
+  plugin.info = {
+    name: 'image-keyboard-response',
+    description: '',
+    parameters: {
+      stimulus: {
+        type: jsPsych.plugins.parameterType.IMAGE,
+        pretty_name: 'Stimulus',
+        default: undefined,
+        description: 'The image to be displayed'
+      },
+      stimulus_height: {
+        type: jsPsych.plugins.parameterType.INT,
+        pretty_name: 'Image height',
+        default: null,
+        description: 'Set the image height in pixels'
+      },
+      stimulus_width: {
+        type: jsPsych.plugins.parameterType.INT,
+        pretty_name: 'Image width',
+        default: null,
+        description: 'Set the image width in pixels'
+      },
+      maintain_aspect_ratio: {
+        type: jsPsych.plugins.parameterType.BOOL,
+        pretty_name: 'Maintain aspect ratio',
+        default: true,
+        description: 'Maintain the aspect ratio after setting width or height'
+      },
+      choices: {
+        type: jsPsych.plugins.parameterType.KEYCODE,
+        array: true,
+        pretty_name: 'Choices',
+        default: jsPsych.ALL_KEYS,
+        description: 'The keys the subject is allowed to press to respond to the stimulus.'
+      },
+      prompt: {
+        type: jsPsych.plugins.parameterType.STRING,
+        pretty_name: 'Prompt',
+        default: null,
+        description: 'Any content here will be displayed below the stimulus.'
+      },
+      stimulus_duration: {
+        type: jsPsych.plugins.parameterType.INT,
+        pretty_name: 'Stimulus duration',
+        default: null,
+        description: 'How long to hide the stimulus.'
+      },
+      trial_duration: {
+        type: jsPsych.plugins.parameterType.INT,
+        pretty_name: 'Trial duration',
+        default: null,
+        description: 'How long to show trial before it ends.'
+      },
+      response_ends_trial: {
+        type: jsPsych.plugins.parameterType.BOOL,
+        pretty_name: 'Response ends trial',
+        default: true,
+        description: 'If true, trial will end when subject makes a response.'
+      },
+    }
+  }
+
+  plugin.trial = function(display_element, trial) {
+
+    // display stimulus
+    var html = '<img src="'+trial.stimulus+'" id="jspsych-image-keyboard-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>';
+
+    // add prompt
+    if (trial.prompt !== null){
+      html += trial.prompt;
+    }
+
+    // render
+    display_element.innerHTML = html;
+
+    // store response
+    var response = {
+      rt: null,
+      key: null
+    };
+
+    // function to end trial when it is time
+    var end_trial = function() {
+
+      // kill any remaining setTimeout handlers
+      jsPsych.pluginAPI.clearAllTimeouts();
+
+      // kill keyboard listeners
+      if (typeof keyboardListener !== 'undefined') {
+        jsPsych.pluginAPI.cancelKeyboardResponse(keyboardListener);
+      }
+
+      // gather the data to store for the trial
+      var trial_data = {
+        "rt": response.rt,
+        "stimulus": trial.stimulus,
+        "key_press": response.key
+      };
+
+      // clear the display
+      display_element.innerHTML = '';
+
+      // move on to the next trial
+      jsPsych.finishTrial(trial_data);
+    };
+
+    // function to handle responses by the subject
+    var after_response = function(info) {
+
+      // 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-keyboard-response-stimulus').className += ' responded';
+
+      // only record the first response
+      if (response.key == null) {
+        response = info;
+      }
+
+      if (trial.response_ends_trial) {
+        end_trial();
+      }
+    };
+
+    // start the response listener
+    if (trial.choices != jsPsych.NO_KEYS) {
+      var keyboardListener = jsPsych.pluginAPI.getKeyboardResponse({
+        callback_function: after_response,
+        valid_responses: trial.choices,
+        rt_method: 'performance',
+        persist: false,
+        allow_held_key: false
+      });
+    }
+
+    // hide stimulus if stimulus_duration is set
+    if (trial.stimulus_duration !== null) {
+      jsPsych.pluginAPI.setTimeout(function() {
+        display_element.querySelector('#jspsych-image-keyboard-response-stimulus').style.visibility = 'hidden';
+      }, trial.stimulus_duration);
+    }
+
+    // end trial if trial_duration is set
+    if (trial.trial_duration !== null) {
+      jsPsych.pluginAPI.setTimeout(function() {
+        end_trial();
+      }, trial.trial_duration);
+    }
+
+  };
+
+  return plugin;
+})();