Pro PHP and jQuery by Jason Lengstorf.pdf - Computer Science ...

354
CHAPTER 10 ■ EXTENDING JQUERY
};
})(jQuery);
Creating a Publicly Accessible Helper Method
To keep your plugin code clean and organized, you will place the actual animation of the elements in a
helper method called zoom.
This method, like the defaults object, will be publicly accessible under the dateZoom namespace.
Making this method public means that a user can potentially redefine the method before calling the
plugin or even call the method outside of the plugin, if he so desires.
You create the zoom method by inserting the following bold code into the dateZoom plugin:
(function($){
// A plugin that enlarges the text of an element when moused
// over, then returns it to its original size on mouse out
$.fn.dateZoom = function(options)
{
// Only overwrites values that were explicitly passed by
// the user in options
var opts = $.extend($.fn.dateZoom.defaults, options);
};
// Loops through each matched element and returns the
// modified jQuery object to maintain chainability
return this.each(function(){
// more code here
});
// Defines default values for the plugin
$.fn.dateZoom.defaults = {
"fontsize" : "110%",
"easing" : "swing",
"duration" : "600",
"callback" : null
};
// Defines a utility function that is available outside of the
// plugin if a user is so inclined to use it
$.fn.dateZoom.zoom = function(element, size, opts)
{
// zoom the elements
};
})(jQuery);
This method accepts the element to animate, the size to which it should be animated, and an object
containing options.