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Added destroy methods #227

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Added destroy methods #227

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e982d49
Added destroy method and clean up
joshgagnon Oct 20, 2014
95bdfb6
Update jquery.lazyload.min.js
joshgagnon Oct 20, 2014
a4dc3f7
Clean up of formatting
joshgagnon Oct 20, 2014
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122 changes: 79 additions & 43 deletions jquery.lazyload.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,24 +13,31 @@
*
*/

(function($, window, document, undefined) {
(function($, window){
var $window = $(window);

$.fn.lazyload = function(options) {
var elements = this;
var $container;
var settings = {
threshold : 0,
failure_limit : 0,
event : "scroll",
effect : "show",
container : window,
data_attribute : "original",
skip_invisible : true,
appear : null,
load : null,
placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC"
};
var plugin_name = 'lazyload';
var methods = {
init: function(options) {
options = options || {};
var self = this;
if(!this.length){
return;
}
var elements = this;
var $container;
var settings = {
threshold : 0,
failure_limit : 0,
event : "scroll",
effect : "show",
container : window,
data_attribute : "original",
skip_invisible : true,
appear : null,
load : null,
placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC"
};

function update() {
var counter = 0;
Expand All @@ -42,11 +49,11 @@
}
if ($.abovethetop(this, settings) ||
$.leftofbegin(this, settings)) {
/* Nothing. */
// Nothing.
} else if (!$.belowthefold(this, settings) &&
!$.rightoffold(this, settings)) {
$this.trigger("appear");
/* if we found an image we'll load, reset the counter */
// if we found an image we'll load, reset the counter
counter = 0;
} else {
if (++counter > settings.failure_limit) {
Expand Down Expand Up @@ -77,11 +84,11 @@

/* Fire one scroll event per scroll. Not one scroll event per image. */
if (0 === settings.event.indexOf("scroll")) {
$container.bind(settings.event, function() {
$container.on(settings.event + '.lazyload', function() {
return update();
});
}

var images = [];
this.each(function() {
var self = this;
var $self = $(self);
Expand All @@ -102,8 +109,8 @@
var elements_left = elements.length;
settings.appear.call(self, elements_left, settings);
}
$("<img />")
.bind("load", function() {
images.push($("<img />")
.one("load", function() {

var original = $self.attr("data-" + settings.data_attribute);
$self.hide();
Expand All @@ -127,7 +134,7 @@
settings.load.call(self, elements_left, settings);
}
})
.attr("src", $self.attr("data-" + settings.data_attribute));
.attr("src", $self.attr("data-" + settings.data_attribute)));
}
});

Expand All @@ -139,32 +146,61 @@
$self.trigger("appear");
}
});
}
});
}

/* Check if something appears when window is resized. */
$window.bind("resize", function() {
update();
});

/* With IOS5 force loading images when navigating with back button. */
/* Non optimal workaround. */
$window.on("resize.lazyload",update);
// With IOS5 force loading images when navigating with back button.
// Non optimal workaround.
var apple_hack = function(event) {
if (event.originalEvent && event.originalEvent.persisted) {
elements.each(function() {
$(this).trigger("appear");
});
}
};
if ((/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion)) {
$window.bind("pageshow", function(event) {
if (event.originalEvent && event.originalEvent.persisted) {
elements.each(function() {
$(this).trigger("appear");
});
}
});
$window.on("pageshow.lazyload", apple_hack);
}

/* Force initial check if images should appear. */
$(document).ready(function() {
update();
});
update();

return this;
$(this).data(plugin_name, {
destroy: function(){
$window.off("resize.lazyload", update);
$window.off("pageshow.lazyload", apple_hack);
$container.off(settings.event + '.lazyload');
$container = null;
elements.each(function(){
$(this).off('appear');
});
elements = null;
$(images).each(function(){
$(this).off();
});
images = [];
}
});
},
destroy: function() {
var $this = $(this),
data = $this.data(plugin_name);
if (data) {
data.destroy();
$this.removeData(plugin_name);
}
}
};

$.fn[plugin_name] = function(method) {
// Method calling logic
if (methods[method]) {
return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
} else if (typeof method === 'object' || !method) {
return methods.init.apply(this, arguments);
} else {
$.error('Method ' + method + ' does not exist');
}
};

/* Convenience methods in jQuery namespace. */
Expand Down
2 changes: 1 addition & 1 deletion jquery.lazyload.min.js
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