scroll-overflow-panel/index.html at master · mangei/scroll-overflow-panel · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Scroll Panel Effect</title>
	<style>
		body {
			padding: 0;
			margin: 0;
			font-size: 24pt;
		}

		.container {
			height: 700px;
			width: 400px;
			margin: 50px;
		}

		.scroll-container {
			position: relative;
			overflow: hidden;
			width: inherit;
			height: inherit;
		}

		.scroll-content {
			position: relative;
			overflow: auto;
			height: inherit;
			width: inherit;
		}

		.scroll-panel {
			z-index: 5;
		}

		#topbox, #bottombox {
			position: absolute;
			height: 300px;
			width: 100%;
		}

		#topbox {
			background-color: lightblue;
		}

		#bottombox {
			background-color: lightgreen;
		}
	</style>
	<script src="//code.jquery.com/jquery-1.12.0.min.js"></script>
</head>
<body>
	<div class="container">
		<div class="scroll-container">

			<div id="topbox" class="scroll-panel">
				Wird geladen ...
			</div>
			<div id="bottombox" class="scroll-panel">
				Wird geladen ...
			</div>

			<div class="scroll-content">
				<div>
					Lorem ipsum dolor sit amet, consectetur adipisicing elit,
					sed do eiusmod tempor incididunt ut labore et dolore magna
					aliqua. Ut enim ad minim veniam, quis nostrud exercitation
					ullamco laboris nisi ut aliquip ex ea commodo consequat.
					Duis aute irure dolor in reprehenderit in voluptate velit
					esse cillum dolore eu fugiat nulla pariatur. Excepteur
					sint occaecat cupidatat non proident, sunt in culpa qui
					officia deserunt mollit anim id est laborum.
				</div>
				<div>
					Lorem ipsum dolor sit amet, consectetur adipisicing elit,
					sed do eiusmod tempor incididunt ut labore et dolore magna
					aliqua. Ut enim ad minim veniam, quis nostrud exercitation
					ullamco laboris nisi ut aliquip ex ea commodo consequat.
					Duis aute irure dolor in reprehenderit in voluptate velit
					esse cillum dolore eu fugiat nulla pariatur. Excepteur
					sint occaecat cupidatat non proident, sunt in culpa qui
					officia deserunt mollit anim id est laborum.
				</div>
				<div>
					Lorem ipsum dolor sit amet, consectetur adipisicing elit,
					sed do eiusmod tempor incididunt ut labore et dolore magna
					aliqua. Ut enim ad minim veniam, quis nostrud exercitation
					ullamco laboris nisi ut aliquip ex ea commodo consequat.
					Duis aute irure dolor in reprehenderit in voluptate velit
					esse cillum dolore eu fugiat nulla pariatur. Excepteur
					sint occaecat cupidatat non proident, sunt in culpa qui
					officia deserunt mollit anim id est laborum.
				</div>
				<div>
					Lorem ipsum dolor sit amet, consectetur adipisicing elit,
					sed do eiusmod tempor incididunt ut labore et dolore magna
					aliqua. Ut enim ad minim veniam, quis nostrud exercitation
					ullamco laboris nisi ut aliquip ex ea commodo consequat.
					Duis aute irure dolor in reprehenderit in voluptate velit
					esse cillum dolore eu fugiat nulla pariatur. Excepteur
					sint occaecat cupidatat non proident, sunt in culpa qui
					officia deserunt mollit anim id est laborum.
				</div>
			</div>
		</div>
	</div>
	<script>

		scrollPanelPlugin($('.scroll-container').find('.scroll-content'), $('.scroll-container').find('#topbox'), 'top', function() { console.log('LOAD top'); });

		scrollPanelPlugin($('.scroll-container').find('.scroll-content'), $('.scroll-container').find('#bottombox'), 'bottom', function() { console.log('LOAD bottom'); });

		function scrollPanelPlugin(content, panel, position, finishCallback) {
			var plugin = this;
			plugin.name = '';

			var basisMargin = -1 * panel.height();

			// configuration
			var speed = 5;
			var hideTimeout = 1000;

			// start position of panel
			panel.css(position, basisMargin);

			var currentMargin = 0;
			plugin.isFinished = false;

			// create unique id for event handling
			if(scrollPanelPlugin.id === undefined) {
				scrollPanelPlugin.id = 0;
			}
			var id = scrollPanelPlugin.id++;

			// create timeout for automatic hide
			var oldTimeout = undefined;
			var resetTimeout = function() {
				clearTimeout(oldTimeout);
				oldTimeout = setTimeout (function() {
					currentMargin = 0;
					panel.css('transition', '0.5s ease-in-out');
					panel.css(position, basisMargin);

				}, hideTimeout);
			};

			content.on('mousewheel.' + plugin.name + '-' + id, function(event) {

				if(plugin.isFinished) {
					event.preventDefault();
				}

				// reset timer for automatic hide
				resetTimeout();

				var isAtBorder = false;
				if(position === 'top') {
					// is at top?
					isAtBorder = content.scrollTop() === 0;
				} else if(position === 'bottom') {

			   		// calculate height of the inner elements
			   		var contentInnerHeight = 0;
			   		content.children().each(function(){
			   			contentInnerHeight += $(this).outerHeight(true);
			   		});

					// is at bottom? (with some epsilon)
					isAtBorder = content.scrollTop() + content.height() >= contentInnerHeight - 1;
				}

				if(isAtBorder) {
					var marginWasZero = currentMargin === 0;

			   		// calculate the new margin
			   		currentMargin += speed;
			   		var newMargin = basisMargin + currentMargin;
			   		newMargin = Math.min(0, newMargin);

				   	// we only jump if the margin was not zero before,
				   	// because if we start at the top and scroll down
				   	// it would show the panel, which is not intended
				   	if(!marginWasZero) {
				   		panel.css('transition', '');
				   		panel.css(position, newMargin);
				   	}

				   	// if the panel is fully visible, we are finished
				   	if(newMargin === 0) {
				   		content.off('mousewheel.' + plugin.name + '-' + id);
				   		clearTimeout(oldTimeout);
				   		plugin.isFinished = true;
				   		finishCallback();
				   	}
				   } else {
		   			// reset panel, if we scroll into tje opposite direction
		   			// of the border
		   			currentMargin = 0;
		   			panel.css('transition', '0.5s ease-in-out');
		   			panel.css(position, basisMargin);
		   		}
		   	});
		}
	</script>
</body>
</html>