mirror of
https://github.com/jspsych/jsPsych.git
synced 2025-05-12 08:38:11 +00:00
138 lines
3.7 KiB
JavaScript
138 lines
3.7 KiB
JavaScript
/**
|
|
* jspsych-single-stim
|
|
* Josh de Leeuw
|
|
*
|
|
* plugin for displaying a stimulus and getting a keyboard response
|
|
*
|
|
* documentation: docs.jspsych.org
|
|
*
|
|
**/
|
|
|
|
|
|
jsPsych.plugins["single-stim"] = (function() {
|
|
|
|
var plugin = {};
|
|
|
|
jsPsych.pluginAPI.registerPreload('single-stim', 'stimulus', 'image');
|
|
|
|
plugin.trial = function(display_element, trial) {
|
|
|
|
// if any trial variables are functions
|
|
// this evaluates the function and replaces
|
|
// it with the output of the function
|
|
trial = jsPsych.pluginAPI.evaluateFunctionParameters(trial);
|
|
|
|
// set default values for the parameters
|
|
trial.choices = trial.choices || [];
|
|
trial.response_ends_trial = (typeof trial.response_ends_trial == 'undefined') ? true : trial.response_ends_trial;
|
|
trial.timing_stim = trial.timing_stim || -1;
|
|
trial.timing_response = trial.timing_response || -1;
|
|
trial.is_html = (typeof trial.is_html == 'undefined') ? false : trial.is_html;
|
|
trial.prompt = trial.prompt || "";
|
|
|
|
// this array holds handlers from setTimeout calls
|
|
// that need to be cleared if the trial ends early
|
|
var setTimeoutHandlers = [];
|
|
|
|
// display stimulus
|
|
if (!trial.is_html) {
|
|
display_element.append($('<img>', {
|
|
src: trial.stimulus,
|
|
id: 'jspsych-single-stim-stimulus'
|
|
}));
|
|
} else {
|
|
display_element.append($('<div>', {
|
|
html: trial.stimulus,
|
|
id: 'jspsych-single-stim-stimulus'
|
|
}));
|
|
}
|
|
|
|
//show prompt if there is one
|
|
if (trial.prompt !== "") {
|
|
display_element.append(trial.prompt);
|
|
}
|
|
|
|
// store response
|
|
var response = {
|
|
rt: -1,
|
|
key: -1
|
|
};
|
|
|
|
// function to end trial when it is time
|
|
var end_trial = function() {
|
|
|
|
// kill any remaining setTimeout handlers
|
|
for (var i = 0; i < setTimeoutHandlers.length; i++) {
|
|
clearTimeout(setTimeoutHandlers[i]);
|
|
}
|
|
|
|
// 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
|
|
};
|
|
|
|
//jsPsych.data.write(trial_data);
|
|
|
|
// clear the display
|
|
display_element.html('');
|
|
|
|
// 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
|
|
$("#jspsych-single-stim-stimulus").addClass('responded');
|
|
|
|
// only record the first response
|
|
if (response.key == -1) {
|
|
response = info;
|
|
}
|
|
|
|
if (trial.response_ends_trial) {
|
|
end_trial();
|
|
}
|
|
};
|
|
|
|
// start the response listener
|
|
if (JSON.stringify(trial.choices) != JSON.stringify(["none"])) {
|
|
var keyboardListener = jsPsych.pluginAPI.getKeyboardResponse({
|
|
callback_function: after_response,
|
|
valid_responses: trial.choices,
|
|
rt_method: 'date',
|
|
persist: false,
|
|
allow_held_key: false
|
|
});
|
|
}
|
|
|
|
// hide image if timing is set
|
|
if (trial.timing_stim > 0) {
|
|
var t1 = setTimeout(function() {
|
|
$('#jspsych-single-stim-stimulus').css('visibility', 'hidden');
|
|
}, trial.timing_stim);
|
|
setTimeoutHandlers.push(t1);
|
|
}
|
|
|
|
// end trial if time limit is set
|
|
if (trial.timing_response > 0) {
|
|
var t2 = setTimeout(function() {
|
|
end_trial();
|
|
}, trial.timing_response);
|
|
setTimeoutHandlers.push(t2);
|
|
}
|
|
|
|
};
|
|
|
|
return plugin;
|
|
})();
|