-
Notifications
You must be signed in to change notification settings - Fork 0
/
stickyCSS.js
129 lines (117 loc) · 4.22 KB
/
stickyCSS.js
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
function makeSticky(id, config = null) {
var theTable, innerHTML, body, styleElem;
styleElem = document.createElement('STYLE');
// *****************************************
// table given by id or direct as object
// ******************************************
if (typeof id === 'string') {
body = document.getElementById(id).tBodies[0];
theTable = document.getElementById(id);
} else if (typeof id === 'object') {
body = id.tBodies[0];
theTable = id;
id = theTable.id;
}
if (body === null || id === '' || theTable.querySelector('thead') === null) {
return;
}
theTable.dataset.stickycols = 0;
// *****************************************
// merge given config with default.
// This way we have allways a config
// ******************************************
config = Object.assign({}, {'col': 0, 'loff': 0, 'toff': 0}, config);
config.toff = getConfig(config.toff, 'clientHeight');
config.loff = getConfig(config.loff, 'clientWidth');
// *****************************************
// create style sheet
// ******************************************
innerHTML = `
#${id} thead {
position: sticky;
top:${config.toff}px;
z-index: 4;
}`;
if (config.col > 0) {
theTable.dataset.stickycols = config.col; // as info
let l = 0;
if (config.loff) {
l = config.loff;
}
for (let i = 0; i < config.col; i++) {
innerHTML += `
#${id} td:nth-child(${i + 1}) {
position: sticky;
left: ${l}px;
z-index: 3;
}
#${id} th:nth-child(${i + 1}){
position: sticky;
left: ${l}px;
z-index: 3;
}
`;
l += body.rows[0].cells[i].clientWidth;
}
}
// *****************************************
// hide the table to speed up work before
// the style is appended to the header
// ******************************************
theTable.style.display = 'none';
styleElem.insertAdjacentHTML('beforeend', innerHTML);
requestAnimationFrame(() => {
// speed up work if there are many sticky columns
document.getElementsByTagName('head')[0].appendChild(styleElem);
// *****************************************
// remove stickyness for header cells that
// are out of scope because of colspan etc
// ******************************************
removeSticky(theTable, config.col);
theTable.style.display = '';
});
return styleElem;
// *****************************************
// get vaues
// ******************************************
function getConfig(configAttrib, what) {
let value = 0, rect = null, add = 0;
if (typeof configAttrib === 'string' && configAttrib !== '') {
let obj = document.getElementById(configAttrib);
if (obj) {
rect = obj.getBoundingClientRect();
value = obj[what];
}
} else if (typeof configAttrib === 'object') {
rect = configAttrib.getBoundingClientRect();
value = configAttrib[what];
} else if (typeof configAttrib === 'number') {
value = configAttrib;
}
if (rect !== null) {
if (what === 'clientWidth') {
add = rect.left;
} else if (what === 'clientHeight') {
add = rect.top;
}
}
return value + add;
}
// *****************************************
// remove stickyness from not related header
// cells
// ******************************************
function removeSticky(theTable, col) {
if (col <= 0) {
return;
}
[].forEach.call(theTable.tHead.rows, (row) => {
[].forEach.call(row.cells, (cell) => {
if (cell.style.position === 'sticky' && (cell.colSpan > col || cell.cellIndex >= col)) {
cell.style.position = 'static';
}
});
}
);
}
}