\n
Alright. Let’s begin with our workstation.<\/p>\n
var quiz = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0;\n\nvar questions = [\n [\"What is 36 + 42\", \"64\", \"78\", \"76\", \"B\"],\n [\"What is 7 x 4?\", \"21\", \"27\", \"28\", \"C\"],\n [\"What is 16 \/ 4?\", \"4\", \"6\", \"3\", \"A\"],\n [\"What is 8 x 12?\", \"88\", \"112\", \"96\", \"C\"]\n];\n<\/code><\/pre>\nNotice that quiz<\/strong> and correct<\/strong> are numbers only. I think “quiz” will be the counter of done questions and “correct” will be the counter of correct questions.
\nAll the other variables are undefined, except questions<\/strong> wich have a pretty curious Array’s structure. The obvious: it’s a list of questions with 3 choices only. Each question follows this structure:<\/p>\n[\" QUESTION \", \" OPTION A \", \" OPTION B \", \" OPTION C \", \" CORRECT OPTION \"];\n<\/code><\/pre>\nSo I think that’s unlimited. If you want to add some questions, try that.<\/p>\n
Let’s continue. After our global variables we program some functions to make the quizz happen. They’re get<\/strong> – return a DOM element by id -, renderQuestion<\/strong> – show the current question – and checkAnswer<\/strong> – action taked when someone choose an option.
\nI think that function get it’s just to clear the code, it’s not so required. Let’s jump to the next, right?<\/p>\n function renderQuestion(){\n test = get(\"test\"); \/\/document.getElementById('test')\n if(quiz >= questions.length){\n test.innerHTML = \"<h2>You got \"+correct+\" of \"+questions.length+\" questions correct<\/h2>\";\n get(\"test_status\").innerHTML = \"Test completed\";\n quiz = 0;\n correct = 0;\n return false;\n }\n get(\"test_status\").innerHTML = \"Question \"+(quiz+1)+\" of \"+questions.length;\n question = questions[quiz][0];\n chA = questions[quiz][1];\n chB = questions[quiz][2];\n chC = questions[quiz][3];\n test.innerHTML = \"<h3>\"+question+\"<\/h3>\";\n\n test.innerHTML += \"<input type=\"radio\" name=\"choices\" value=\"A\"> \"+chA+\"<br>\";\n test.innerHTML += \"<input type=\"radio\" name=\"choices\" value=\"B\"> \"+chB+\"<br>\";\n test.innerHTML += \"<input type=\"radio\" name=\"choices\" value=\"C\"> \"+chC+\"<br><br>\";\n test.innerHTML += \"<button onclick='checkAnswer()'>Submit Answer<\/button>\";\n }\n<\/code><\/pre>\nThe first thing this function do is var test = document.getElementById('test')<\/code>. Then it checks if your quiz already ended with quiz >= questions.length<\/code>. That is, quiz really is just a counter of completed questions. Of course, as we’re starting, quiz < questions.length<\/code> will push us out of that conditional.<\/p>\nget(\"test_status\").innerHTML = \"Question \"+(quiz+1)+\" of \"+questions.length;\n<\/code><\/pre>\nThat will print “Question 1 of 4” inside DOM #test_status. Here we will finally use our undefined variables:<\/p>\n
question = questions[quiz][0];\nchA = questions[quiz][1];\nchB = questions[quiz][2];\nchC = questions[quiz][3];\n<\/code><\/pre>\nAs quiz = 0<\/code>, question = \"What is 36+42\"<\/code>, chA = \"64\"<\/code>, chB = \"78\"<\/code> and chC = \"76\"<\/code>. Then we’re ready to print all the question inside DOM #test:<\/p>\ntest.innerHTML = \"<h3>\"+question+\"<\/h3>\";\ntest.innerHTML += \"<input type=\"radio\" name=\"choices\" value=\"A\"> \"+chA+\"<br>\";\ntest.innerHTML += \"<input type=\"radio\" name=\"choices\" value=\"B\"> \"+chB+\"<br>\";\ntest.innerHTML += \"<input type=\"radio\" name=\"choices\" value=\"C\"> \"+chC+\"<br><br>\";\ntest.innerHTML += \"<button onclick='checkAnswer()'>Submit Answer<\/button>\";\n<\/code><\/pre>\nThe output will be:<\/p>\n
<h3>What is 36 + 42<\/h3><input type=\"radio\" name=\"choices\" value=\"A\"> 64<br><input type=\"radio\" name=\"choices\" value=\"B\"> 78<br><input type=\"radio\" name=\"choices\" value=\"C\"> 76<br><button onclick='checkAnswer()'>Submit Answer<\/button>\n<\/code><\/pre>\nPay atention!<\/h1>\n
Here’s a button that calls the function checkAnswer:<\/p>\n
<button onclick='checkAnswer()'>Submit Answer<\/button>\n<\/code><\/pre>\nThat’s what keep your quiz on.
\nSo, let’s “click that” to call what we need:<\/p>\n
function checkAnswer(){\n choices = document.getElementsByName(\"choices\");\n for(var i=0; i<choices.length; i++){\n if(choices[i].checked){\n choice = choices[i].value;\n }\n }\n\n if(choice == questions[quiz][4]){\n correct++;\n }\n quiz++;\n renderQuestion();\n }\n<\/code><\/pre>\nThe first thing: what’s our choices?<\/strong><\/p>\nchoices = document.getElementsByName(\"choices\");\n<\/code><\/pre>\nNow we have them. But what’s our selected choice’s value?<\/p>\n
for(var i=0; i<choices.length; i++){\n if(choices[i].checked){\n choice = choices[i].value;\n }\n}\n<\/code><\/pre>\nRemember: choices<\/strong> is our current list of choices<\/em>, choice<\/strong> is our current choice’s value<\/em>. Let’s continue.<\/p>\nif(choice == questions[quiz][4]){\n correct++;\n}\n<\/code><\/pre>\nIt verifies if our current choice’s value<\/em> is equal to our current question’s correct choice<\/strong><\/em>. If it’s, then our counter of correct questions will be incremented.<\/p>\nquiz++;\nrenderQuestion();\n<\/code><\/pre>\nJust to finish: we move to the next question and call renderQuestion to start over again. When you finish the last one question, the renderQuestion function will stop on that conditional quiz >= questions.length<\/code>, calling this:<\/p>\ntest.innerHTML = \"<h2>You got \"+correct+\" of \"+questions.length+\" questions correct<\/h2>\";\nget(\"test_status\").innerHTML = \"Test completed\";\nquiz = 0;\ncorrect = 0;\nreturn false;\n<\/code><\/pre>\nI think it’s easier to understand now.<\/p>\n
Oh, I almost forgot. Did we started the quiz? Not. That’s what this do:<\/p>\n
window.addEventListener(\"load\", renderQuestion, false);\n<\/code><\/pre>\nWhen your window’s ready, it’ll call renderQuestion() for you.<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
<\/span> <\/p><\/div>\n<\/div>\n[ad_2]<\/p>\n
solved JavaScript Quiz Program <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Alright. Let’s begin with our workstation. var quiz = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0; var questions = [ [“What is 36 + 42”, “64”, “78”, “76”, “B”], [“What is 7 x 4?”, “21”, “27”, “28”, “C”], [“What is 16 \/ 4?”, “4”, “6”, “3”, “A”], [“What is … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[333],"class_list":["post-9572","post","type-post","status-publish","format-standard","hentry","category-solved","tag-javascript"],"yoast_head":"\n[Solved] JavaScript Quiz Program - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] JavaScript Quiz Program - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Alright. Let’s begin with our workstation. var quiz = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0; var questions = [ ["What is 36 + 42", "64", "78", "76", "B"], ["What is 7 x 4?", "21", "27", "28", "C"], ["What is 16 \/ 4?", "4", "6", "3", "A"], ["What is ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-19T09:35:01+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] JavaScript Quiz Program\",\"datePublished\":\"2022-09-19T09:35:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\"},\"wordCount\":395,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"javascript\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\",\"name\":\"[Solved] JavaScript Quiz Program - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-09-19T09:35:01+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] JavaScript Quiz Program\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] JavaScript Quiz Program - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] JavaScript Quiz Program - JassWeb","og_description":"[ad_1] Alright. Let’s begin with our workstation. var quiz = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0; var questions = [ [\"What is 36 + 42\", \"64\", \"78\", \"76\", \"B\"], [\"What is 7 x 4?\", \"21\", \"27\", \"28\", \"C\"], [\"What is 16 \/ 4?\", \"4\", \"6\", \"3\", \"A\"], [\"What is ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/","og_site_name":"JassWeb","article_published_time":"2022-09-19T09:35:01+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] JavaScript Quiz Program","datePublished":"2022-09-19T09:35:01+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/"},"wordCount":395,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["javascript"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/","url":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/","name":"[Solved] JavaScript Quiz Program - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-09-19T09:35:01+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-javascript-quiz-program\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] JavaScript Quiz Program"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/9572","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=9572"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/9572\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=9572"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=9572"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=9572"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}