Shuo/client/js/lib/jquery.scrollGlue.js

90 lines
1.8 KiB
JavaScript

/*!
* jquery-scroll-glue
* https://github.com/erming/jquery-scroll-glue
*
* Copyright (c) 2014 Mattias Erming <mattias@mattiaserming.com>
* Licensed under the MIT License.
*
* Version 0.1.1
*/
(function($) {
var append = $.fn.append;
$.fn.append = function() {
return append.apply(this, arguments).trigger("append");
};
var html = $.fn.html;
$.fn.html = function() {
var result = html.apply(this, arguments);
if (arguments.length) {
// Only trigger this event when something
// has been inserted.
this.trigger("html");
}
return result;
};
$.fn.scrollGlue = function(options) {
var settings = $.extend({
animate: 0
}, options);
var self = this;
if (self.size() > 1) {
return self.each(function() {
$(this).scrollGlue(options);
});
}
var timer;
var resizing = false;
$(window).on("resize", function() {
// This will prevent the scroll event from triggering
// while resizing the window.
resizing = true;
clearTimeout(timer);
timer = setTimeout(function() {
resizing = false;
}, 100);
if (sticky) {
self.scrollToBottom();
}
});
var sticky = false;
self.on("scroll", function() {
if (!resizing) {
sticky = self.isScrollAtBottom();
}
});
self.trigger("scroll");
self.on("append html", function() {
if (sticky) {
self.scrollToBottom(settings.animate);
}
});
return this;
};
$.fn.scrollToBottom = function(animate) {
return this.each(function() {
$(this).finish().animate({scrollTop: this.scrollHeight}, animate || 0);
});
};
$.fn.isScrollAtBottom = function() {
if ((this.scrollTop() + this.outerHeight() + 1) >= this.prop("scrollHeight")) {
return true;
}
};
$(function() {
// Find elements with the 'scroll-glue' attribute and
// activate the plugin.
$("[scroll-glue]").scrollGlue();
});
})(jQuery);