var DDSPEED 10 var DDTIMER 15 main function to handle the mouse events

 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
var DDSPEED = 10;
var DDTIMER = 15;
// main function to handle the mouse events //
function ddMenu(id,dir) {
var head = document.getElementById(id + '-ddheader');
var cont = document.getElementById(id + '-ddcontent');
clearInterval(cont.timer);
if(dir == 1) {
clearTimeout(head.timer);
if(cont.maxh && cont.maxh <= cont.offsetHeight) {
return;
} else if(!cont.maxh) {
cont.style.display = 'block';
cont.style.height = 'auto';
cont.maxh = cont.offsetHeight;
cont.style.height = '0px';
}
cont.timer = setInterval("ddSlide('" + id + "-ddcontent', 1)", DDTIMER);
} else {
head.timer = setTimeout('ddCollapse(\'' + id + '-ddcontent\')', 50);
}
}
// collapse the menu //
function ddCollapse(id) {
var cont = document.getElementById(id);
cont.timer = setInterval("ddSlide('" + id + "', -1)", DDTIMER);
}
// cancel the collapse if a user rolls over the dropdown content //
function cancelHide(id) {
var head = document.getElementById(id + '-ddheader');
var cont = document.getElementById(id + '-ddcontent');
clearTimeout(head.timer);
clearInterval(cont.timer);
if(cont.offsetHeight < cont.maxh) {
cont.timer = setInterval("ddSlide('" + id + "-ddcontent', 1)", DDTIMER);
}
}
// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(id,dir) {
var cont = document.getElementById(id);
var currheight = cont.offsetHeight;
var dist;
if(dir == 1) {
dist = (Math.round((cont.maxh - currheight) / DDSPEED));
} else {
dist = (Math.round(currheight / DDSPEED));
}
if(dist <= 1) {
dist = 1;
}
cont.style.height = currheight + (dist * dir) + 'px';
cont.style.opacity = currheight / cont.maxh;
cont.style.filter = 'alpha(opacity=' + (currheight * 100 / cont.maxh) + ')';
if((currheight < 2 && dir != 1) || (currheight > (cont.maxh - 2) && dir == 1)) {
clearInterval(cont.timer);
}
}