Here is some code for a simple Quiz program written in JavaScript:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>Quiz</title>
<style>
div#test{ border:#000 1px solid; padding:10px 40px 40px 40px; }
</style>
<script type="text/javascript">
// pos is position of where the user in the test or which question they're up to
var pos = 0, test, test_status, question, choice, choices, chA, chB, chC, correct = 0;
// this is a multidimensional array with 4 inner array elements with 5 elements inside them
// if you don't want answers viewable in the code, then you should use PHP and mySQL database
var questions = [
["What is 5 + 4?", "10", "9", "7", "B"],
["What is 15 - 3?", "11", "13", "12", "C"],
["What is 6 x 4?", "24", "26", "21", "A"],
["What is 16 / 4?", "6", "3", "4", "C"]
];
// this get function is short for the getElementById function
function get(x){
return document.getElementById(x);
}
function renderQuestion(){
test = get("test");
if(pos >= questions.length){
test.innerHTML = "<h2>You got "+correct+" of "+questions.length+" questions correct</h2>";
get("test_status").innerHTML = "Test completed";
// resets the variable to allow users to restart the test
pos = 0;
correct = 0;
// stops rest of renderQuestion function running when test is completed
return false;
}
get("test_status").innerHTML = "Question "+(pos+1)+" of "+questions.length;
question = questions[pos][0];
chA = questions[pos][1];
chB = questions[pos][2];
chC = questions[pos][3];
test.innerHTML = "<h3>"+question+"</h3>";
// the += appends to the data we started on the line above
test.innerHTML += "<input type='radio' name='choices' value='A'> "+chA+"<br>";
test.innerHTML += "<input type='radio' name='choices' value='B'> "+chB+"<br>";
test.innerHTML += "<input type='radio' name='choices' value='C'> "+chC+"<br><br>";
test.innerHTML += "<button onclick='checkAnswer()'>Submit Answer</button>";
}
function checkAnswer(){
// use getElementsByName because we have an array which it will loop through
choices = document.getElementsByName("choices");
for(var i=0; i<choices.length; i++){
if(choices[i].checked){
choice = choices[i].value;
}
}
// checks if answer matches the correct choice
if(choice == questions[pos][4]){
//each time there is a correct answer this value increases
correct++;
}
// changes position of which character user is on
pos++;
// then the renderQuestion function runs again to go to next question
renderQuestion();
}
window.addEventListener("load", renderQuestion, false);
</script>
</head>
<body>
<h2 id="test_status"></h2>
<div id="test"></div>
</body>
</html> |