User:Avdmeers/Dropdown.js

var DDSPEED = 10; var DDTIMER = 15;

// main function to handle the mouse events // function ddMenu(id,d){ var h = document.getElementById(id + '-ddheader'); var c = document.getElementById(id + '-ddcontent'); clearInterval(c.timer); if(d == 1){ clearTimeout(h.timer); if(c.maxh && c.maxh <= c.offsetHeight){return} else if(!c.maxh){ c.style.display = 'block'; c.style.height = 'auto'; c.maxh = c.offsetHeight; c.style.height = '0px'; }   c.timer = setInterval(function{ddSlide(c,1)},DDTIMER); }else{ h.timer = setTimeout(function{ddCollapse(c)},50); } }

// collapse the menu // function ddCollapse(c){ c.timer = setInterval(function{ddSlide(c,-1)},DDTIMER); }

// cancel the collapse if a user rolls over the dropdown // function cancelHide(id){ var h = document.getElementById(id + '-ddheader'); var c = document.getElementById(id + '-ddcontent'); clearTimeout(h.timer); clearInterval(c.timer); if(c.offsetHeight < c.maxh){ c.timer = setInterval(function{ddSlide(c,1)},DDTIMER); } }

// incrementally expand/contract the dropdown and change the opacity // function ddSlide(c,d){ var currh = c.offsetHeight; var dist; if(d == 1){ dist = (Math.round((c.maxh - currh) / DDSPEED)); }else{ dist = (Math.round(currh / DDSPEED)); } if(dist <= 1 && d == 1){ dist = 1; } c.style.height = currh + (dist * d) + 'px'; c.style.opacity = currh / c.maxh; c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')'; if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){ clearInterval(c.timer); } }