95 lines
2.0 KiB
JavaScript
95 lines
2.0 KiB
JavaScript
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/*!
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* stickyscroll
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* https://github.com/erming/stickyscroll
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*
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* Copyright (c) 2014 Mattias Erming <mattias@mattiaserming.com>
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* Licensed under the MIT License.
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*
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* Version 1.3.1
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*/
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(function($) {
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$.fn.sticky = function(options) {
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var settings = $.extend({
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disableManualScroll: false,
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overflow: 'auto',
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scrollToBottom: true,
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speed: 0
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}, options);
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var self = this;
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if (self.size() > 1) {
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return self.each(function() {
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$(this).sticky(options);
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});
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}
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self.css('overflow-y', settings.overflow);
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self.css('-webkit-overflow-scrolling', 'touch');
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if (settings.scrollToBottom) {
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self.scrollToBottom();
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}
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var resizeTimer;
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var resizing = false;
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$(window).on('resize', function() {
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self.finish();
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// This will prevent the scroll event from triggering
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// while resizing the browser.
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resizing = true;
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clearTimeout(resizeTimer);
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resizeTimer = setTimeout(function() {
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resizing = false;
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}, 100);
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if (sticky) {
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self.scrollToBottom();
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}
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});
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var scrollTimer;
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var sticky = true;
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self.on('scroll', function() {
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if (settings.disableManualScroll) {
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self.scrollToBottom();
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} else if (!resizing) {
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clearTimeout(scrollTimer);
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scrollTimer = setTimeout(function() {
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sticky = self.isScrollAtBottom();
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}, 50);
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}
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});
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self.trigger('scroll');
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self.on('prepend append', function() {
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if (sticky) {
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self.scrollToBottom(settings.speed);
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}
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});
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return this;
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};
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// Normally, these functions won't trigger any events.
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// Lets override them.
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var events = ['prepend', 'append'];
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$.each(events, function(i, e) {
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var fn = $.fn[e];
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$.fn[e] = function() {
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return fn.apply(this, arguments).trigger(e);
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};
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});
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$.fn.isScrollAtBottom = function() {
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if ((this.scrollTop() + this.outerHeight() + 1) >= this.prop('scrollHeight')) {
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return true;
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}
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};
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$.fn.scrollToBottom = function(speed) {
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return this.each(function() {
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$(this).finish().animate({scrollTop: this.scrollHeight}, speed || 0);
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});
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};
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})(jQuery);
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