project_example-site/opacity.js at master · feonit/project_example-site · GitHub

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/*
wwww.tigir.com - 06.07.2006

Source: http://www.tigir.com/js/opacity.js

Áèáëèîòåêà opacity.js ê ñòàòüå "CSS ïðîçðà÷íîñòü (css opacity, javascript opacity)" - http://www.tigir.com/opacity.htm

setElementOpacity - óñòàíîâêà ïðîçðà÷íîñòè
getOpacityProperty - ïðîâåðêà, åñòü ëè âîçìîæíîñòü ìåíÿòü ïðîçðà÷íîñòü
fadeOpacity - ïëàâíîå èçìåíåíèå ïðîçðà÷íîñòè
*/

/* Ôóíêöèÿ êðîññáðàóçåðíîé óñòàíîâêè ïðîçðà÷íîñòè

Ïðèìåð: setElementOpacity(document.body, 0.5); //ñäåëàòü äîêóìåíò ïðîçðà÷íûì íà ïîëîâèíó
*/
function setElementOpacity(oElem, nOpacity)
{
	var p = getOpacityProperty();
	(setElementOpacity = p=="filter"?new Function('oElem', 'nOpacity', 'nOpacity *= 100;	var oAlpha = oElem.filters["DXImageTransform.Microsoft.alpha"] || oElem.filters.alpha;	if (oAlpha) oAlpha.opacity = nOpacity; else oElem.style.filter += "progid:DXImageTransform.Microsoft.Alpha(opacity="+nOpacity+")";'):p?new Function('oElem', 'nOpacity', 'oElem.style.'+p+' = nOpacity;'):new Function)(oElem, nOpacity);
}

// Ôóíêöèÿ getOpacityProperty() âîçâðàùàåò ñâîéñòâî êîòîðîå èñïîëüçóåòñÿ äëÿ ñìåíû ïðîçðà÷íîñòè èëè undefined, è ìîæåò èñïîëüçîâàòüñÿ äëÿ ïðîâåðêè âîçìîæíîñòè èçìåíåíèÿ ïðîçðà÷íîñòè
function getOpacityProperty()
{
	var p;
	if (typeof document.body.style.opacity == 'string') p = 'opacity';
	else if (typeof document.body.style.MozOpacity == 'string') p =  'MozOpacity';
	else if (typeof document.body.style.KhtmlOpacity == 'string') p =  'KhtmlOpacity';
	else if (document.body.filters && navigator.appVersion.match(/MSIE ([\d.]+);/)[1]>=5.5) p =  'filter';

	return (getOpacityProperty = new Function("return '"+p+"';"))();
}

/* Ôóíêöèè äëÿ ïëàâíîãî èçìåíåíèÿ ïðîçðà÷íîñòè:

1) fadeOpacity.addRule('opacityRule1', 1, 0.5, 30); //âíà÷àëå ñîçäàåì ïðàâèëî, çàäàåì èìÿ ïðàâèëà, íà÷àëüíóþ ïðîçðà÷íîñòü è êîíå÷íóþ, íåîáÿçàòåëüíûé ïàðàìåòð çàäåðæêè, âëèéÿþùèé íà ñêîðîñòü ñìåíû ïðîçðà÷íîñòè
2) fadeOpacity('elemID', 'opacityRule1'); // âûïîëíèòü ïëàâíóþ ñìåíó ïðîçðà÷íîñòè ýëåìåíòà ñ id ðàâíûì elemID, ïî ïðàâèëó opacityRule1
3) fadeOpacity.back('elemID'); //âåðíóòüñÿ â èñõîäíîå ñîòîÿíèå ïðîçðà÷íîñòè
*/
function fadeOpacity(sElemId, sRuleName, bBackward)
{
	var elem = document.getElementById(sElemId);
	if (!elem || !getOpacityProperty() || !fadeOpacity.aRules[sRuleName]) return;

	var rule = fadeOpacity.aRules[sRuleName];
	var nOpacity = rule.nStartOpacity;

	if (fadeOpacity.aProc[sElemId]) {clearInterval(fadeOpacity.aProc[sElemId].tId); nOpacity = fadeOpacity.aProc[sElemId].nOpacity;}
	if ((nOpacity==rule.nStartOpacity && bBackward) || (nOpacity==rule.nFinishOpacity && !bBackward)) return;

	fadeOpacity.aProc[sElemId] = {'nOpacity':nOpacity, 'tId':setInterval('fadeOpacity.run("'+sElemId+'")', fadeOpacity.aRules[sRuleName].nDalay), 'sRuleName':sRuleName, 'bBackward':Boolean(bBackward)};
}

fadeOpacity.addRule = function(sRuleName, nStartOpacity, nFinishOpacity, nDalay){fadeOpacity.aRules[sRuleName]={'nStartOpacity':nStartOpacity, 'nFinishOpacity':nFinishOpacity, 'nDalay':(nDalay || 30),'nDSign':(nFinishOpacity-nStartOpacity > 0?1:-1)};};

fadeOpacity.back = function(sElemId){fadeOpacity(sElemId,fadeOpacity.aProc[sElemId].sRuleName,true);};

fadeOpacity.run = function(sElemId)
{
	var proc = fadeOpacity.aProc[sElemId];
	var rule = fadeOpacity.aRules[proc.sRuleName];

	proc.nOpacity = Math.round(( proc.nOpacity + .1*rule.nDSign*(proc.bBackward?-1:1) )*10)/10;
	setElementOpacity(document.getElementById(sElemId), proc.nOpacity);

	if (proc.nOpacity==rule.nStartOpacity || proc.nOpacity==rule.nFinishOpacity) clearInterval(fadeOpacity.aProc[sElemId].tId);
}
fadeOpacity.aProc = {};
fadeOpacity.aRules = {};