[SOLVED] simple flashcard script

sw45acp · November 2, 2009

Hi, I am trying to create a very simple flash card script. Problem is, I can't find any examples on how to navigate the array containing the questions. When a person clicks next it will show the answer to the question, then next again to show the question in the sequence. I have this code so far.

cards = new Array( "question 1", "answer", "question 2", "answer" );

function prevcard() {
?
}

function nextcard() {
?
}

any help you can give would greatly be appreciated!

sw45acp · November 2, 2009

I kind of just figured out a simple one. It writes to a textbox:

<html>
<head>
  <script type="text/javascript">
var stuff = new Array()
var which = 0;

stuff[0] = "one";
stuff[1] = "two";
stuff[2] = "three";
             //previous card
function prevcard() {
	if (which>0) {
		which --;
		theform.key.value = stuff[which];
	}
}
             //next card
function nextcard() {
	if (which<stuff.length-1) {
		which ++;
		theform.key.value = stuff[which];
	}
}
</script>
</head>
<body>

<form action="" name="theform">
<input type="text" name="key" /><br />
<input type="button" name="back" value="Previous card" onClick="prevcard()" />    
<input type="button" name="next" value="Next card" onClick="nextcard()" />    
</form>

</body>
</html>

However, I can't get it write to div element instead of a textbox. I am accessing it via id and using innerHTML. Can't get it to work...

  <style type="text/css">
  div {
	width: 200px;
	height: 150px;
	border: 1px solid #FF0000;
}
  </style>
  <script type="text/javascript">
var x = document.getElementById("mainbox");
var stuff = new Array()
var which = 0;

stuff[0] = "one";
stuff[1] = "two";
stuff[2] = "three";

function prevcard() {
	if (which>0) {
		which --;
		x.innerHTML = stuff[which];
	}
}

function nextcard() {
	if (which<stuff.length-1) {
		which ++;
		x.innerHTML = stuff[which];
	}
}
</script>
</head>
<body>
<div id="mainbox"></div><br />

<input type="button" name="back" value="Previous card" onClick="prevcard()" />    
<input type="button" name="next" value="Next card" onClick="nextcard()" />

Alex · November 2, 2009

I wrote this while you were writing your solution... Maybe it'll help, if you need an explanation just ask.

<script type="text/javascript">
var qnum = 0;
var anum = 0;
var questions = new Array('Question 1', 'Question 2', 'Question 3');
var answers = new Array('Answer 1', 'Answer 2', 'Answer 3');

function nextStep()
{
if(anum == answers.length)
	qnum = anum = 0;
if(qnum == anum)
{
	document.getElementById("question").innerHTML = questions[qnum++];
	document.getElementById("answer").innerHTML = '???';
	document.getElementById("next").value = 'Next Answer';
}
else
{
	document.getElementById("answer").innerHTML = answers[anum++];
	document.getElementById("next").value = 'Next Question';
}
}
</script>

<div>
Question: <span id="question"></span><br />
Answer: <span id="answer"></span><br />
<input type="submit" value="First Question!" id="next" name="next" onclick="nextStep();" />
</div>

sw45acp · November 2, 2009

This will work just fine! However, can we put in a back button to go back one card at a time also?

sw45acp · November 2, 2009

I added this but it after going back 2 the next button has to be clicked twice which is odd

function backStep()
{
if (qnum == anum)
{
	qnum -- ;
	anum -- ;
	document.getElementById("question").innerHTML = questions[qnum];
	document.getElementById("answer").innerHTML = '???';
}
else {
	qnum --;
	document.getElementById("question").innerHTML = questions[qnum];
}
}

Adam · November 2, 2009

Perhaps try this..

var qna = [['question 1', 'answer 1'],
           ['question 2', 'answer 2'],
           ['question 3', 'answer 3']];

var i = 0;

window.onload = function() {
    display();
}

function backStep() {
    i = (i == 0) ? qna.length-1 : i-1;
    display();
}

function nextStep() {
    i = (i == qna.length-1) ? 0 : i+1;
    display();
}

function display() {
    document.getElementById('question').innerHTML = qna[i][0];
    document.getElementById('answer').innerHTML   = qna[i][1];
}

sw45acp · November 3, 2009

This one works great. Thank you. I'm just a little confused on next and back functions on how exactly the code works there. I know with php that the ? and : means that: if x=2 ? (do this), if not : do that. Is that the same here?

Adam · November 3, 2009

Yeah, exactly the same..

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[SOLVED] simple flashcard script

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