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taskutil.js
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taskutil.js
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// Utilities for running psychology experiments.
// Particulary useful for pre/post experiment
// questionaires
var tu = {};
// Handle a keypress by calling "func" on the actual string for the key
// if a key with a character code is pressed, execute "func"
// otherwise, do nothing
tu.keyPress = function (e,func) {
var evtobj = window.event ? event : e;
//distinguish between IE (window.event) and Firefox
var unicode = evtobj.charCode;
if (unicode !== undefined) {
var actualkey = String.fromCharCode(unicode);
func(actualkey);
}
};
// if an arrow key is pressed, call the function "func"
// otherwise, do nothing
tu.keyArrows = function (e,func) {
var evtobj= window.event ? event : e;
var code = evtobj.keyCode;
var arrows = {left : 37, up : 38, right : 39, down : 40};
if (code === arrows.left) {
func('left');
}
else if (code === arrows.right) {
func('right');
}
else if (code === arrows.up) {
func('up');
}
else if (code === arrows.down) {
func('down');
}
};
/*tu.keyPress = function (e,func) {
var evtobj = window.event ? event : e;
//distinguish between IE (window.event) and Firefox
var unicode = evtobj.charCode ? evtobj.charCode : evtobj.keyCode;
var actualkey = String.fromCharCode(unicode);
func(actualkey);
};*/
// array of image DOM elements. This
// disables some simple attributes
tu.protectImages = function (list_img_DOM) {
$(list_img_DOM).attr('ondrag',"return false")
.attr('ondragstart',"return false")
.attr('oncontextmenu',"return false")
.attr('galleryimg',"no")
.attr('onmousedown',"return false");
return list_img_DOM;
};
// randomize the order of elements in an array
tu.shuffle = function ( myArray ) {
var i = myArray.length;
if ( i == 0 ) return false;
while ( --i ) {
var j = Math.floor( Math.random() * ( i + 1 ) );
var tempi = myArray[i];
var tempj = myArray[j];
myArray[i] = tempj;
myArray[j] = tempi;
}
return myArray;
};
// get a random integer between lb and ub, inclusive
tu.randint = function (lb,ub) {
if (ub < lb) {
throw new Error('invalid call of randint');
}
var range = ub-lb+1;
var out = Math.floor( Math.random()*range) + lb;
return out;
}
// generate a random permutation of a vector
// starting at first_elem:last_elem
tu.randperm = function (first_elem,last_elem) {
var perm = new Array();
for (var i=first_elem; i<=last_elem; i++) {
var j=i-first_elem;
perm[j] = i;
}
perm = tu.shuffle(perm);
return perm;
};
// apply permutation
tu.apply_perm = function (myArray,perm) {
if (myArray.length !== perm.length) {
throw new Error('permutation is the wrong length');
}
var n = myArray.length;
var newArray = new Array();
for (var i=0; i<n; i++) {
newArray[i] = myArray[perm[i]];
}
return newArray;
};
// get value of checked radio button
tu.getRadioCheckedValue = function (radio_name) {
var oRadio = document.getElementsByName(radio_name);
for (var i = 0; i < oRadio.length; i++) {
if (oRadio[i].checked) {
return oRadio[i].value;
}
}
return '';
};
//
// Get all of the radio buttons with a particular class.
// Return a list of objects with name/value pairs
//
// Input: radio_class is a string identifying the class of radio buttons
tu.getSurveyRadios = function (radio_class) {
var rnames = $('.'+radio_class).get_attr('name');
rnames = rnames.unique();
var n = rnames.length;
if (n===0) {throw new Error('jQuery did not find any survey radio buttons.'); }
var list = [];
for (var i=0; i<n; i++) {
var val = tu.getRadioCheckedValue(rnames[i]);
list[i] = {name : rnames[i], value : val};
}
return list;
};
//
// Get all of the text areas with a particular class.
// Return a list of objects with name/value pairs
//
// Input: text_class is a string identifying the class of text areas
tu.getSurveyText = function (text_class) {
var tnames = $('.'+text_class).get_attr('id');
var n = tnames.length;
if (n===0) {throw new Error('jQuery did not find any survey text.'); }
var list = [];
for (var i=0; i<n; i++) {
var val = $('#'+tnames[i]).val();
list[i] = {name : tnames[i], value : val};
}
return list;
};
// Get value of a name/value pair from the survey
tu.getValue = function (str,list_objs) {
var n = list_objs.length;
for (var i=0; i<n; i++) {
if (str === list_objs[i].name) {
return list_objs[i].value;
}
}
return undefined;
};
// Does the name in the name/value pair have an empty value?
tu.emptyField = function (str,list_objs) {
var value = tu.getValue(str,list_objs);
if (value === '') {
return true;
}
else if (value === undefined) {
throw new Error('This field is not defined.');
}
return false;
};
// create lines of matlab to display
// all the url parameters
tu.printUrlParams = function () {
var list_p = $.url().param();
var keys = Object.keys(list_p);
var n = keys.length;
var out = '';
for (var i=0; i<n; i++) {
out = out + "s." + keys[i] + "='" + list_p[keys[i]] + "'; ";
}
return out;
};
// create a line of matlab to save a field
// from the survey
tu.printFields = function (list_objs) {
var n = list_objs.length;
var out = "";
for (var i=0; i<n; i++) {
var name = list_objs[i].name;
var value = list_objs[i].value;
value = value.replace(/(\r\n|\n|\r)/gm," ");
value = value.replace(/["']/g, "");
out = out + "s." + name + "='" + value + "'; ";
}
return out;
};
// print the drawing associated with each canvas
// to lines of matlab code
tu.printListCanvas = function (list_canvas) {
var n = list_canvas.length;
var out = "";
for (var i=0; i<n; i++) {
var stk = list_canvas[i].getDrawing();
var img = list_canvas[i].getImage();
var img_name = list_canvas[i].imageName();
stk = stk.replace(/'/g,"''");
var indx = i+1;
out = out + "s.strokes{" + (i+1) + "}=";
out = out + "'" + stk + "'; ";
out = out + "s.image{" + (i+1) + "}=";
out = out + "'" + img + "'; ";
out = out + "s.input_image{" + (i+1) + "}=";
out = out + "'" + img_name + "'; ";
}
return out;
};
// clear the "checked" feature on all radio buttons
tu.clearRadio = function (radio_name) {
var oRadio = document.getElementsByName(radio_name);
for (var i = 0; i < oRadio.length; i++) {
oRadio[i].checked = false;
}
};
// see if all of the quiz answers are correct.
// Quiz must be all radio buttons, with a value="1"
// for correct answers
//
// Input: list_qs is an array of question names
// Output: number of missed questions
tu.checkQuiz = function (list_qs) {
var n = list_qs.length;
var list_ans = [];
for (var i=0; i<n; i++) { // get all answers
list_ans[i] = tu.getRadioCheckedValue(list_qs[i]);
tu.clearRadio(list_qs[i]);
}
var corr = 0;
for (var i=0; i<n; i++) { // record if they are correct
if (list_ans[i] !== '' && parseInt(list_ans[i]) === 1) {
corr += 1;
}
}
// return number of misses
var nmiss = n - corr;
return nmiss;
};
// change the HTML display to a different section.
//
// sections must be DIVs marked with class=.task_selection
tu.changeDisplay = function (display,myclass) {
$('.'+myclass).attr('style','display:none;');
var str_sel = '#'+display;
if ($(str_sel).exists()) {
$(str_sel).attr('style','');
}
else if (display === '')
{
}
else {
throw new Error("invalid display option");
}
};
// check workerId against list of workers
tu.flagWhiteList = function () {
var url = $.url();
var wID = url.param('workerId');
var listID = url.param('access');
if (wID == null || listID == null) {
return false;
}
var arrayExclude = listID.split(",");
var n = arrayExclude.length;
for (var i=0; i < n; i++) {
str = arrayExclude[i];
if (str === wID) {
return true
}
}
return false;
};
// check workerId against list of workers
tu.flagRepeatWorker = function () {
var url = $.url();
var wID = url.param('workerId');
var excludeID = url.param('exclude');
if (wID === null) {
return false;
}
if (excludeID !== undefined && excludeID !== null) {
throw new Error('taskutil: The exclude parameter is no longer allowed');
return true;
}
if (exclude === undefined) {
throw new Error('taskutil: The exclude variable should not be undefined');
return true;
}
var listID = exclude;
var arrayExclude = listID.split(",");
var n = arrayExclude.length;
for (var i=0; i < n; i++) {
str = arrayExclude[i];
if (str === wID) {
return true
}
}
return false;
};
// return true if they are using the Chrome browser
tu.flagChrome = function () {
return (/chrom(e|ium)/.test(navigator.userAgent.toLowerCase()));
};
// return true if they are using Internet Explorer
tu.flagIE = function () {
var ua = window.navigator.userAgent;
var msie = ua.indexOf("MSIE ");
if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)) {
return true;
}
else {
return false;
}
};
// return true if this page is being viewed from preview mode
tu.inPreviewMode = function () {
var url = $.url();
var aID = url.param('assignmentId');
if (aID === 'ASSIGNMENT_ID_NOT_AVAILABLE') {
return true;
}
return false;
};
// Set the form POST action to be correct, if we are using the sandbox
tu.setPostURL = function () {
var sandbox = document.referrer && ( document.referrer.indexOf('workersandbox') != -1)
if (sandbox) {
$('#myform').attr('action','https://workersandbox.mturk.com/mturk/externalSubmit');
}
else {
$('#myform').attr('action','https://www.mturk.com/mturk/externalSubmit');
}
};
// get time in milliseconds since mindnight, 1 Jan 1970
tu.getTimeMilli = function () {
var ms = new Date().getTime();
return ms;
};
// get time in seconds since mindnight, 1 Jan 1970
tu.getTime = function () {
var ms = tu.getTimeMilli();
return ms / 1000;
};