Question

http://docs.jquery.com/Plugins/Authoring#Defaults_and_Options describes how a plugin could have default options.

var settings = $.extend( {
  'location'         : 'top',
  'background-color' : 'blue'
}, options);

The second part of the selected answer jQuery Plugin: Adding Callback functionality describes how to add a callback in the option object.

// 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);

How would I add both default settings and a callback function at the same time? Also, I am a little confused on why I would extend the default callback function against arguments[0] or an empty object. Thanks

Answer 1

simply merge both, you can have as many items in a object as you want

$.fn.myPlugib = function( user_options ) {  
    var options = $.extend({
        'location'         : 'top',
        'background-color' : 'blue'
        'callback': function() {}
    }, user_options || {});

    //now options object can be used to get callback or any other options when needed
    options.callback.call(this, options.location)
}

user_options || {} makes sure that if user hasn’t provided any options we use empty options object