How to use events and event handlers inside a jquery plugin? - jquery-plugins

Question

I'm triyng to build a simple animation jQuery-plugin. The main idea is to take an element and manipulate it in some way repeatedly in a fixed intervall which would be the fps of the animation.
I wanted to accomplish this through events. Instead of using loops like for() or while() I want to repeat certain actions through triggering events. The idea behind this: I eventualy want to be able to call multiple actions on certain events, like starting a second animation when the first is done, or even starting it when one animation-sequence is on a certain frame.
Now I tried the following (very simplified version of the plugin):
(function($) {
$.fn.animation = function() {
obj = this;
pause = 1000 / 12; //-> 12fps
function setup(o) {
o.doSomething().trigger('allSetUp');
}
function doStep(o, dt) {
o.doSomething().delay(dt).trigger('stepDone');
}
function sequenceFinished(o) {
o.trigger('startOver');
}
function checkProgress(o) {
o.on({
'allSetup': function(event) {
console.log(event); //check event
doStep(o, pause);
},
'stepDone': function(event) {
console.log(event); //check event
doStep(o, pause);
},
'startOver': function(event) {
console.log(event); //check event
resetAll(o);
}
});
}
function resetAll(o) {
/*<-
reset stuff here
->*/
//then start over again
setup(o);
}
return this.each(function() {
setup(obj);
checkProgress(obj);
});
};
})(jQuery);
Then i call the animation like this:
$(document).ready(function() {
$('#object').animation();
});
And then – nothing happens. No events get fired. My question: why? Is it not possible to use events like this inside of a jQuery plugin? Do I have to trigger them 'manualy' in $(document).ready() (what I would not prefer, because it would be a completely different thing – controling the animation from outside the plugin. Instead I would like to use the events inside the plugin to have a certain level of 'self-control' inside the plugin).
I feel like I'm missing some fundamental thing about custom events (note: I'm still quite new to this) and how to use them...
Thx for any help.
SOLUTION:
The event handling and triggering actually works, I just had to call the checkProgress function first:
Instead of
return this.each(function() {
setup(obj);
checkProgress(obj);
});
I had to do this:
return this.each(function() {
checkProgress(obj);
setup(obj);
});
So the event listening function has to be called before any event gets triggered, what of course makes perfect sense...

Answer 1

You need set event on your DOM model for instance:
$('#foo').bind('custom', function(event, param1, param2) {
alert('My trigger')
});
$('#foo').on('click', function(){ $(this).trigger('custom');});​
You DOM element should know when he should fire your trigger.
Please note that in your plugin you don't call any internal function - ONLY DECLARATION