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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="content-type" content="application/xhtml+xml; charset=UTF-8" />
<title>Anchor Jumps</title>
<style type="text/css">
p { color:gray; }
div.card { background-color:cyan; }
</style>
<script type="text/javascript">
function cardHistory() {
this.redo = new Array(); // backward history
this.undo = new Array(); // forward history
this.get = "";
this.post = "";
this.requestheaders = "";
this.pushUndo = function(url) { // save a url to history
// hitting this function results in discarded forward history
if (this.redo.length > 0)
this.redo = [];
this.undo.push(url);
return true;
}
this.pushRedo = function(url) { // saves url to redo list (forward)
this.redo.push(url);
return true;
}
// pops the url from undo stack to redo stack
this.goBack = function() {
if (this.undo.length > 0) {
var back = this.undo.pop();
this.redo.push(back);
this.jump(back);
}
}
// pushes the url from redo stack to undo stack (history stack)
this.goForward = function() {
if (this.redo.length > 0) {
this.pushUndo(this.redo.pop());
this.jump();
}
}
this.jump = function(url) {
// go to what's on top of history stack
if (url.indexOf('#') != 0)
window.location.href = url; // jumping to an url
else
window.location.hash = url; // jumping to an hash anchor
}
this.undoTop = function() {
return this.undo[this.undo.length-1];
}
this.redoTop = function() {
return this.redo[this.redo.length-1];
}
}
var trackHistory = new cardHistory();
</script>
</head>
<body>
<!--
- form should have unique id
- everytime we leave a card we should push that chanhe onto undo stack
onsubmit="return trackHistory.pushUndo(document.getElementById('card1_form').action);"
-->
<div id="card1" class="card">
<h2>Card 1</h2>
<p>This is Card 1.</p>
Here is just some text below Card 1.<br />
More text to kill window space.<br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card1_form" action="#card2" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Next</button>
</form>
</div>
<div id="card2" class="card">
<h2>Card 2</h2>
<p>This is Card 2.</p>
Here is just some text below Card 2.<br />
More text to kill window space.<br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card2_form" action="#card3" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Next</button>
</form>
</div>
<div id="card3" class="card">
<h2>Card 3</h2>
<p>This is Card 3.</p>
Here is just some text below Card 3.<br />
More text to kill window space.<br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card3_form" action="#card4" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Next</button>
</form>
</div>
<div id="card4" class="card">
<h2>Card 4</h2>
<p>This is Card 4.</p>
Here is just some text below Card 4.<br />
More text to kill window space.<br />
<a href="#card6" onclick="trackHistory.pushUndo(window.location.href);">Go to Card 6</a><br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card4_form" action="#card5" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Next</button>
</form>
</div>
<div id="card5" class="card">
<h2>Card 5</h2>
<p>This is Card 5.</p>
Here is just some text below Card 5.<br />
More text to kill window space.<br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card5_form" action="#card6" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Next</button>
</form>
</div>
<div id="card6" class="card">
<h2>Card 6</h2>
<p>This is Card 6.</p>
Here is just some text below Card 6.<br />
More text to kill window space.<br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card6_form" action="#card7" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Next</button>
</form>
</div>
<div id="card7" class="card">
<h2>Card 7</h2>
<p>This is Card 7.</p>
Here is just some text below Card 7.<br />
More text to kill window space.<br />
<button onclick="trackHistory.goBack();">Prev</button>
<form id="card7_form" action="#card1" onsubmit="return trackHistory.pushUndo(window.location.href);">
<button type="submit">Go to Card 1</button>
</form>
</div>
</body>
</html>
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