Jquery - plugin, funkce, vl. selektor

jquery plugin function expression v2

    1/
    (function($){
        $.extend({
            jYoutube: function( url, size ){
                if(url === null){ return ""; }
                size = (size === null) ? "big" : size;
                var vid;
                var results;
                results = url.match("[\\?&]v=([^&#]*)");
                vid = ( results === null ) ? url : results[1];
                if(size == "small"){
                    return "http://img.youtube.com/vi/"+vid+"/2.jpg";
                }else {
                    return "http://img.youtube.com/vi/"+vid+"/0.jpg";
                }
            }
        })
    })(jQuery);
    2/
    $.test = function(text)
    {
    $("#ahoj").text(text);
    }
    $.test("blaaaa");
    3/
    /*
    * jTwitter 1.1.1 - Twitter API abstraction plugin for jQuery
    *
    * Copyright (c) 2009 jQuery Howto
    *
    * Licensed under the GPL license:
    * http://www.gnu.org/licenses/gpl.html
    *
    * URL:
    * http://jquery-howto.blogspot.com
    *
    * Author URL:
    * http://jquery-howto.blogspot.com
    *
    */
    (function( $ ){
        $.extend( {
            jTwitter: function( username, numPosts, fnk ) {
                var info = {};
                
                // If no arguments are sent or only username is set
                if( username == 'undefined' || numPosts == 'undefined' ) {
                    return;
                } else if( $.isFunction( numPosts ) ) {
                    // If only username and callback function is set
                    fnk = numPosts;
                    numPosts = 5;
                }
                
                var url = "http://twitter.com/status/user_timeline/"
                    + username + ".json?count="+numPosts+"&callback=?";
                $.getJSON( url, function( data ){
                    if( $.isFunction( fnk ) ) {
                        fnk.call( this, data );
                    }
                });
            }
        });
    })( jQuery );
    --------------
    použití
    $(document).ready(function(){
    // Get latest 6 tweets by jQueryHowto
    $.jTwitter('jQueryHowto', 10, function(data){
    $('#posts').empty();
    $.each(data, function(i, post){
    $('#posts').append(
    '<div class="post">'
    +' <div class="txt">'
    // See output-demo.js file for details
    + post.text
    +' </div>'
    +'</div>'
    );
    });
    });
    });
    4/
    $.fn.makeRed = function() {
    return $(this).css('background', 'red');
    }
    $('#myTable').find('.firstColumn').makeRed().append('hello');
    5/
    $.extend(
    $.expr[':'],
    {
    over100pixels: function(a) {
    return $(a).height() > 100;
    }
    });
    $('.box:over100pixels').click(function() {
    alert('The element you clicked is over 100 pixels high');
    });

jquery plugin function expression.js

(function($){
$.fn.extend({
//plugin name - animatemenu
animateMenu: function(options) {
var defaults = {
animatePadding: 60,
defaultPadding: 10,
evenColor: '#ccc',
oddColor: '#eee',
};
var options = $.extend(defaults, options);
return this.each(function() {
var o =options;
var obj = $(this);
var items = $("li", obj);
$("li:even", obj).css('background-color', o.evenColor);
$("li:odd", obj).css('background-color', o.oddColor);
items.mouseover(function() {
$(this).animate({paddingLeft: o.animatePadding}, 300);
}).mouseout(function() {
$(this).animate({paddingLeft: o.defaultPadding}, 300);
});
});
}
});
})(jQuery);
======================
(function ($) {
$.fn.textHover = function (options) {
var defaultVal = {
Text: 'Your mouse is over',
ForeColor: 'red',
BackColor: 'gray'
};
var obj = $.extend(defaultVal, options);
return this.each(function () {
var selObject = $(this);
var oldText = selObject.text();
var oldBgColor = selObject.css("background-color");
var oldColor = selObject.css("color");
selObject.hover(function () {
selObject.text(obj.Text);
selObject.css("background-color", obj.BackColor);
selObject.css("color", obj.ForeColor);
},
function () {
selObject.text(oldText);
selObject.css("background-color", oldBgColor);
selObject.css("color", oldColor);
}
);
});
}
})(jQuery);
======================
jQuery.fn.firstPlugin = function () {
return this.each (function () {
alert (this.id);
});
}
======================
jQuery.fn.extend ({
myFirstFunction : function () { alert ("first function") },
thisIsTheSecond : function (message) { alert ("2nd: "+ message) }
});
$.myFirstFunction ();
$.thisIsTheSecond ("hello");
======================
jQuery.expr[":"].startsWith = function (element, index, tokens) {
if (!tokens[3]) return false;
return eval ("/^[/s]*" + tokens[3] + "/i").test ($(element).text());
};
======================
(function($){
$.fn.truncate = function(options) {
var defaults = {
length: 300,
minTrail: 20,
moreText: "more",
lessText: "less",
ellipsisText: "..."
};
var options = $.extend(defaults, options);
return this.each(function() {
obj = $(this);
var body = obj.html();
if(body.length > options.length + options.minTrail) {
var splitLocation = body.indexOf(' ', options.length);
if(splitLocation != -1) {
// truncate tip
var splitLocation = body.indexOf(' ', options.length);
var str1 = body.substring(0, splitLocation);
var str2 = body.substring(splitLocation, body.length - 1);
obj.html(str1 + '<span class="truncate_ellipsis">' + options.ellipsisText +
'</span>' + '<span class="truncate_more">' + str2 + '</span>');
obj.find('.truncate_more').css("display", "none");
// insert more link
obj.append(
'<div class="clearboth">' +
'<a href="#" class="truncate_more_link">' + options.moreText + '</a>' +
'</div>'
);
// set onclick event for more/less link
var moreLink = $('.truncate_more_link', obj);
var moreContent = $('.truncate_more', obj);
var ellipsis = $('.truncate_ellipsis', obj);
moreLink.click(function() {
if(moreLink.text() == options.moreText) {
moreContent.show('normal');
moreLink.text(options.lessText);
ellipsis.css("display", "none");
} else {
moreContent.hide('normal');
moreLink.text(options.moreText);
ellipsis.css("display", "inline");
}
return false;
});
}
} // end if
});
};
})(jQuery);
======================
$.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
}
};
$.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);
};
Using:
$('.elem').myPlugin({
callback: function() {
// some action
}
});

mike-youtube.js

$.fn.showWhenScrolled=function(){
	var self = this;
	
	this.init = function(){
		self.each(function(){
			var self_top   = $(this).offset().top;
			var scroll_top = $(window).scrollTop();
			var win_height = $(window).height();
			var frame      = $(this).find('iframe');
			if(scroll_top > (self_top - win_height)){
				if(!frame.attr('src')){
					frame.attr({src:frame.attr('title')});
				}
			}
		});
	};
	
	$(window).scroll(function(){
		self.init();
	}).resize(function(){
		self.init();
	});
	
	self.init();
};

$('.youtube-container').showWhenScrolled();