javascript.js

jsp实现网络教育系统

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		temp_01_over = newImage("image/temp_01-over.gif");
		preloadFlag = true;
	}
}
 
	self.onError=null;  
	currentX = currentY = 0;    
	whichIt = null;     
        	lastScrollX = 0; lastScrollY = 0;  
	NS = (document.layers) ? 1 : 0;  
	IE = (document.all) ? 1: 0;  
	<!-- STALKER CODE -->  
	function heartBeat() {  
		if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }  
	    if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }  
		if(diffY != lastScrollY) {	                percent = .1 * (diffY - lastScrollY);  
	                if(percent > 0) percent = Math.ceil(percent);  
	                else percent = Math.floor(percent);					if(IE) document.all.floater.style.pixelTop += percent;  
					if(NS) document.floater.top += percent; 	                lastScrollY = lastScrollY + percent;  
	    }  
		if(diffX != lastScrollX) {  
			percent = .1 * (diffX - lastScrollX);  
			if(percent > 0) percent = Math.ceil(percent);  
			else percent = Math.floor(percent);  
			if(IE) document.all.floater.style.pixelLeft += percent;  
			if(NS) document.floater.left += percent;  
			lastScrollX = lastScrollX + percent;  
		}	  
	}	<!-- /STALKER CODE -->  
	<!-- DRAG DROP CODE -->  
	function checkFocus(x,y) {   
	        stalkerx = document.floater.pageX;  
	        stalkery = document.floater.pageY;  
	        stalkerwidth = document.floater.clip.width;  
	        stalkerheight = document.floater.clip.height;  
	        if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight))) return true;  
	        else return false;  
	}	function grabIt(e) {  
		if(IE) {  
			whichIt = event.srcElement;  
			while (whichIt.id.indexOf("floater") == -1) {  
				whichIt = whichIt.parentElement;  
				if (whichIt == null) { return true; }  
		    }  
			whichIt.style.pixelLeft = whichIt.offsetLeft;  
		    whichIt.style.pixelTop = whichIt.offsetTop;  
			currentX = (event.clientX + document.body.scrollLeft);  
	   		currentY = (event.clientY + document.body.scrollTop); 	  
		} else {   
	        window.captureEvents(Event.MOUSEMOVE);  
	        if(checkFocus (e.pageX,e.pageY)) {   
	                whichIt = document.floater;  
	                StalkerTouchedX = e.pageX-document.floater.pageX;  
	                StalkerTouchedY = e.pageY-document.floater.pageY;  
	        } 		}  
	    return true;  
	}  
	function moveIt(e) {  
		if (whichIt == null) { return false; }  
		if(IE) {  
		    newX = (event.clientX + document.body.scrollLeft);  
		    newY = (event.clientY + document.body.scrollTop);  
		    distanceX = (newX - currentX);    distanceY = (newY - currentY);		    currentX = newX;    currentY = newY;  
		    whichIt.style.pixelLeft += distanceX;		    whichIt.style.pixelTop += distanceY;  
			if(whichIt.style.pixelTop < document.body.scrollTop) whichIt.style.pixelTop = document.body.scrollTop;			if(whichIt.style.pixelLeft < document.body.scrollLeft) whichIt.style.pixelLeft = document.body.scrollLeft;  
			if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;  
			if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5;  
			event.returnValue = false;  
		} else {  
			whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);  
	        if(whichIt.left < 0+self.pageXOffset) whichIt.left = 0+self.pageXOffset;  
	        if(whichIt.top < 0+self.pageYOffset) whichIt.top = 0+self.pageYOffset;  
	        if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17)) whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;  
	        if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17)) whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;  
	        return false;  
		}  
	    return false;  
	}  
	function dropIt() {  
		whichIt = null;  
	    if(NS) window.releaseEvents (Event.MOUSEMOVE);  
	    return true;  
	}  
	<!-- DRAG DROP CODE -->  
	if(NS) {  
		window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);  
		window.onmousedown = grabIt;  
	 	window.onmousemove = moveIt;  
		window.onmouseup = dropIt;  
	}  
	if(IE) {  
		document.onmousedown = grabIt;  
	 	document.onmousemove = moveIt;  
		document.onmouseup = dropIt;  
	}  
	if(NS || IE) action = window.setInterval("heartBeat()",1);