jQuery Plugin: Adding Callback functionality

Just execute the callback in the plugin:

$.fn.myPlugin = function(options, callback) {    if (typeof callback == 'function') { // make sure the callback is a function        callback.call(this); // brings the scope to the callback    }};

You can also have the callback in the options object:

$.fn.myPlugin = function() {    // extend the options from pre-defined values:    var options = $.extend({        callback: function() {}    }, arguments[0] || {});    // call the callback and apply the scope:    options.callback.call(this);};

Use it like this:

$('.elem').myPlugin({    callback: function() {        // some action    }});

I don't know if I understand your question correctly. But for the second version: This would call anotherFunction immediately.

Basically your plugin should be some kind of function that looks like this:

var myPlugin = function(options, callback) {    //do something with options here    //call callback    if(callback) callback();} 

You have to provide a function object as callback, so either function(){...} or anotherFunction (without () ).

Bringing back a blast from the past.

Worth noting that if you have two arguments passed, for example:

$.fn.plugin = function(options, callback) { ... };

Then you call the plugin without the options argument but with a callback then you'll run into issues:

$(selector).plugin(function() {...});

I use this to make it a little more flexible:

if($.isFunction(options)) { callback = options }