I want to have a sliding switch. On the left would be Off and on the right would be On. When the user toggles the switch, I want the 'slider' portion to slide to the other side and indicate it is off. I could then have a callback that takes as input the state of the toggle switch so I can act accordingly.
Any idea how to do this?
Using plain javascript
<html>
<head>
<!-- define on/off styles -->
<style type="text/css">
.on { background:blue; }
.off { background:red; }
</style>
<!-- define the toggle function -->
<script language="javascript">
function toggleState(item){
if(item.className == "on") {
item.className="off";
} else {
item.className="on";
}
}
</script>
</head>
<body>
<!-- call 'toggleState' whenever clicked -->
<input type="button" id="btn" value="button"
class="off" onclick="toggleState(this)" />
</body>
</html>
Using jQuery
If you use jQuery, you can do it using the toggle function, or using the toggleClass function inside click event handler, like this:
$(document).ready(function(){
$('a#myButton').click(function(){
$(this).toggleClass("btnClicked");
});
});
Using jQuery UI effects, you can animate transitions: http://jqueryui.com/demos/toggleClass/
Outline: Create two elements: a slider/switch and a trough as a parent of the slider. To toggle the state, switch the slider element between an "on" and an "off" class. In the style for one class, set "left" to 0 and leave "right" the default; for the other class, do the opposite:
<style type="text/javascript">
.toggleSwitch {
width: ...;
height: ...;
/* add other styling as appropriate to position element */
position: relative;
}
.slider {
background-image: url(...);
position: absolute;
width: ...;
height: ...;
}
.slider.on {
right: 0;
}
.slider.off {
left: 0;
}
</style>
<script type="text/javascript">
function replaceClass(elt, oldClass, newClass) {
var oldRE = RegExp('\\b'+oldClass+'\\b');
elt.className = elt.className.replace(oldRE, newClass);
}
function toggle(elt, on, off) {
var onRE = RegExp('\\b'+on+'\\b');
if (onRE.test(elt.className)) {
elt.className = elt.className.replace(onRE, off);
} else {
replaceClass(elt, off, on);
}
}
</script>
...
<div class="toggleSwitch" onclick="toggle(this.firstChild, 'on', 'off');"><div class="slider off" /></div>
Alternatively, just set the background image for the "on" and "off" states, which is a much easier approach than mucking about with positioning.
You mean something like IPhone checkboxes? http://awardwinningfjords.com/2009/06/16/iphone-style-checkboxes.html