// ==UserScript==
// @name            Coursera EXT - Quiz option cross-out
// @description     Coursera Extension -- enables the user to temporary disable some quiz answers/options (eg. the obvious incorrect ones)
// @namespace       http://sepczuk.com/
// @version         0.10
// @include         https://*.coursera.org/*/quiz/attempt*
// @match           https://*.coursera.org/*/quiz/attempt*
// @include         https://*.coursera.org/*/exam/attempt*
// @match           https://*.coursera.org/*/exam/attempt*
// @copyright       2013, Damian Sepczuk, damian at sepczuk period delme com
// ==/UserScript==
function mainWrapper(){
var debug = !false;
var US_SHORT_NAME = 'CourseraEXT-QACO';
var US_VERSION = 0.01;
function debugLog(msg) {
if (!debug) return;
console.log(US_SHORT_NAME + ": " + msg);
}
function disableQuizOption(qo) {
$(qo).css('opacity','.3').prop('disabled', true)
.children('.cext-toggle-this-one').html('○').end()
.children('input').prop('disabled', true).next().css('text-decoration', 'line-through').css('cursor','default');
}
function enableQuizOption(qo) {
$(qo).css('opacity','').prop('disabled', false)
.children('.cext-toggle-this-one').html('●').end()
.children('input').prop('disabled', false).next().css('text-decoration', '').css('cursor','pointer');
}
function toggleQuizOption(qo) {
if ($(qo).prop('disabled') === true) {
enableQuizOption(qo);
} else {
disableQuizOption(qo);
}
}
function main(){
debugLog("Running main!");
var stylesheetText = (function(){/*!HTML!
<style type="text/css">
.cext-choose-this-one {
font-size: 140%;
font-family: monospace;
margin-right: 2px;
cursor: cell;
vertical-align: top;
color: #aaa;
}
.course-disabled-quiz-option {
opacity: .3;
pointer-events: none;
}
.cext-toggle-this-one {
font-size: 130%;
font-family: monospace;
margin-right: 7px;
cursor: pointer;
vertical-align: top;
color: #aaa;
line-height: 17px;
}
.cext-toggle-question {
line-height: 0px;
color: #999;
position: absolute;
left: -40px;
top: 20px;
}
.course-quiz-question-number {
position: relative;
cursor: pointer;
background-color: rgb(234, 234, 234);
padding-left: 10px;
}
</style>
*/}).toString().slice(21,-3);
$(stylesheetText).appendTo('head');
var chooseThisOne = $('<span class="cext-choose-this-one">&#9758;</span>').click(function(){
var quizOption = this.parentElement;
var allButMe = $(quizOption).parent().children().not(quizOption);
var otherEnabled = allButMe.filter(':not([disabled])');
var amIEnabled = $(quizOption).prop('disabled') !== true;
if (otherEnabled.length === 0) {
enableQuizOption(allButMe);
} else {
disableQuizOption(otherEnabled);
enableQuizOption(quizOption);
if($(quizOption).children('input').attr('type')==='radio') {
$(quizOption).children('input').click();
}
}
});
var toggleThisOne = $('<span class="cext-toggle-this-one">&#9679;</span>').click(function(){
toggleQuizOption(this.parentElement);
});
var toggleQuestion = $('<span class="cext-toggle-question">&#9679;</span>');
$('.course-quiz-option').prepend(toggleThisOne).prepend(chooseThisOne);
$('.course-quiz-question-number').prepend(toggleQuestion).toggle(
function(){
$(this).parent().css('opacity', '.3');
$(this).children('.cext-toggle-question').html('&#9675;');
},
function(){
$(this).parent().css('opacity', '');
$(this).children('.cext-toggle-question').html('&#9679;');
});
$('.course-quiz-submit-button-container input[type=submit]').click(function(){
enableQuizOption($('.course-quiz-option'));
});
};
main();
};
if (!document.xmlVersion) {
var script = document.createElement('script');
script.appendChild(document.createTextNode('('+ mainWrapper +')();'));
document.documentElement.appendChild(script);
}