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January 16, 2015 16:22
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Quizzy Part 1 MVC w/ Mithril.js
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| <html> | |
| <head>Quizzy Part 1 MVC</head> | |
| <body> | |
| <div id="app"></div> | |
| <script src="vendor/mithril.js" type="text/javascript"></script> | |
| <script src="quiz.js" type="text/javascript"></script> | |
| <script type="text/javascript"> | |
| Quiz.vm.questions([ | |
| { | |
| id: 100, | |
| content: "What is 2 + 2?", | |
| answerIdx: 1, | |
| options: [ | |
| "2", "4", "yo why are you asking me this" | |
| ] | |
| }, | |
| { | |
| id: 101, | |
| content: "What is 2 + 3?", | |
| answerIdx: 1, | |
| options: [ | |
| "3", "5", "..." | |
| ] | |
| }, | |
| ]) | |
| var appDiv = document.getElementById('app') | |
| m.module(appDiv, Quiz) | |
| </script> | |
| </body> | |
| </html> |
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| (function () { | |
| window.Quiz = {} | |
| Quiz.vm = { | |
| questions: m.prop([]), | |
| // key is question id, value is the answerIdx that user chose | |
| userAnswers: m.prop({}), | |
| // key is question id, value is true or false | |
| correctStatus: m.prop({}) | |
| } | |
| Quiz.saveResults = function (questionId, answers, answerStatuses) { | |
| // database / ajax / local storage stuff | |
| } | |
| Quiz.controller = function () { | |
| var ctrl = {} | |
| var vm = Quiz.vm | |
| ctrl.selectAnswer = function (questionId, answerIdx) { | |
| var answers = vm.userAnswers() | |
| answers[questionId] = answerIdx | |
| } | |
| ctrl.reset = function () { | |
| vm.userAnswers({}) | |
| vm.correctStatus({}) | |
| } | |
| ctrl.grade = function () { | |
| var answers = vm.userAnswers() | |
| var correct = vm.correctStatus() | |
| vm.questions().forEach(function (question) { | |
| var isCorrect = question.answerIdx === answers[question.id] | |
| correct[question.id] = isCorrect | |
| }) | |
| Quiz.saveResults(question.id, answers, correct) | |
| } | |
| return ctrl | |
| } | |
| Quiz.view = function (ctrl) { | |
| return m('form.quiz', { onsubmit: pd(ctrl.grade) }, [ | |
| Quiz.vm.questions().map(questionView), | |
| m('button', { | |
| onclick: function (e) { e.preventDefault(); ctrl.reset() } | |
| // Alternatively: | |
| // onclick: pd(ctrl.reset) | |
| }, "Reset Quiz Form"), | |
| m('button', "Submit") | |
| ]) | |
| function questionView (question) { | |
| return m('.question', [ | |
| m('h3', question.content), | |
| question.options.map(answerOptionView), | |
| answerStatus() | |
| ]) | |
| function answerOptionView (optionText, idx) { | |
| var answers = Quiz.vm.userAnswers() | |
| return [ | |
| m('input[type=radio]', { | |
| name: 'question_' + question.id, | |
| // Two-way Data Binding: | |
| // VM -> View | |
| checked: answers[question.id] === idx, | |
| // View -> VM | |
| onchange: ctrl.selectAnswer.bind(null, question.id, idx) | |
| }), | |
| m('label', optionText) | |
| ] | |
| } | |
| function answerStatus () { | |
| var correct = Quiz.vm.correctStatus() | |
| if (correct[question.id] === undefined) return; | |
| return m('.answer', | |
| correct[question.id] ? "You got it right!" : ":(" | |
| ) | |
| } | |
| } | |
| } | |
| // Wrap a function in another function that prevents the default | |
| function pd (callback) { | |
| return function (e) { e.preventDefault(); callback() } | |
| } | |
| })() |
https://gist.github.com/mindeavor/a39369c9914218b69ec5#file-quiz-js-L68
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https://gist.github.com/mindeavor/a39369c9914218b69ec5#file-quiz-js-L66
it's pretty awesome that mithril picks up on property changes.