bg flickers on mouseOver, in all browsers

**Sheynberg** · 02-25-2009 11:26 AM

Hi there, this is my first post here, I'm hoping you guys can help me. Given my lack of knowledge of JavaScript, I usually try to stay away from it, but for this particular task I couldn't find any other way.

I'm trying to make a button bar where when the user hovers over an image, a list of links appears on top of the same area, with a different background image.

This I've managed to put together, yet when I hover over the area, the background image starts to flicker and continues to do so until I move out of the area.

Any suggestions on how to solve this would be greatly appreciated.

Live test can be found here.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test page</title>
<style type="text/css">
html, body, p, img, div {
	margin:0;
	padding:0;
}
#text {
	font-family:verdana;
	font-size:16px;
}
#text {
	float:left;
	display:none;
	position:absolute;
	left:100px;
	top:100px;
	width:202px;
	height:210px;
}
#navbar {
	float:left;
	display:block;
	position:absolute;
	left:100px;
	top:100px;
}
</style>
<script type="text/javascript">
function doStuff(el) {
el.src="PresentationButton1.png";
document.getElementById("text").style.display="block";
el.onmouseout=function() {
el.src="PresentationButton2.png";
document.getElementById("text").style.display="none";
}
}
</script>
</head>
<body>
<div id="navbar"><img src="PresentationButton2.png" alt="" onmouseover="doStuff(this)" /><img src="PresentationButton2.png" alt="" onmouseover="doStuff(this)" /><img src="PresentationButton2.png" alt="" onmouseover="doStuff(this)" /></div>
<div id="text">This text just keeps on flickering, it's giving me a headache...</div>
</body>
</html>

**Jodarecode** · 02-26-2009 04:49 PM

your link seems to work in Firefox 3 and IE 7 without any flickering.

**toicontien** · 02-26-2009 05:25 PM

It might be caused by the fact when the "text" appears, it fires the onmouseout event on the <img>, and then the onmouseover event fires immediately on the "text".

Also, maybe the "text" needs a background color so the <img> in the background doesn't show through?

**Sheynberg** · 02-26-2009 05:46 PM

Hi guys, thanks for replying.

The live test page has a different version than the code that I posted. Most of the issues are solved; there's no flickering anymore, and it even works in IE6.

There's one issue left though:
I'm trying to make a navbar with 4 boxes, each with a list of links. Each box is supposed to have a different set of backgrounds - one background for mouseOut and one for mouseOver. As the code is now, it works with only one set of backgrounds for all 4 boxes.

Does anyone have any ideas on how to change the script so that it does its magic not only for 'div_image' but also separately for the (future) classes 'div_image2', 'div_image3', and 'div_image4'?

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Change Background and Show Text on Hover</title>
<style type="text/css">
html, body, p, img, div, ul, li {
	margin:0;
	padding:0;
}
#buttonbar {
	width:808px;
	height:210px;
	float:left;
	position:absolute;
	top:50px;
	left:50px;
	font-family:Verdana, Arial, Helvetica, sans-serif;
	font-size:16px;
}
.image_div, .image_div_hover {
	background: url(ContentButton1.png);
	width: 202px;
	height: 210px;
	float: left;
}
.image_div div {
	display: none;
}
.image_div:hover, .image_div_hover {
	background: url(ContentButton2.png);
}
.image_div:hover div, .image_div_hover div {
	display: block;
}
.buttonstyle li ul li a {
	font-weight:normal;
	display:block;
	height:25px;
}
.buttonstyle li a {
	font-weight:bold;
	display:block;
	height:25px;
	padding:6px 10px 0px 10px;
}
.buttonstyle li ul li a:hover {
	background-color:#FFF;
}
a {
	text-decoration:none;
	color:#666666;
}
ul, li {
	list-style:none;
}
</style>
<!--[if IE 6]>
<script type="text/javascript">
function prepareElements() {
	if(!document.getElementsByTagName("div"))
		return;
		
	var divs = document.getElementsByTagName("div");
	
	for(var i=0; i < divs.length; i++)
		if(divs[i].className == 'image_div') {
			divs[i].onmouseover = doMouseOver;
			divs[i].onmouseout = doMouseOut;
		}
}

function doMouseOver() {
	this.className = 'image_div_hover';
}

function doMouseOut() {
	this.className = 'image_div';
}
</script>
<![endif]-->
</head>
<body>
<div id="buttonbar">
		<div class="image_div">
				<div>
						<ul class="buttonstyle">

								<li><a href="#">Content</a>
										<ul>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>

										</ul>
								</li>
						</ul>
				</div>
		</div>
		<div class="image_div">
				<div>
						<ul class="buttonstyle">
								<li><a href="#">Presentation</a>

										<ul>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
										</ul>
								</li>

						</ul>
				</div>
		</div>
		<div class="image_div">
				<div>
						<ul class="buttonstyle">
								<li><a href="#">Admin</a>
										<ul>

												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
										</ul>
								</li>
						</ul>

				</div>
		</div>
		<div class="image_div">
				<div>
						<ul class="buttonstyle">
								<li><a href="#">Extensions</a>
										<ul>
												<li><a href="#">Categories</a></li>

												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
												<li><a href="#">Categories</a></li>
										</ul>
								</li>
						</ul>
				</div>

		</div>
</div>
<!--[if IE 6]>
<script type="text/javascript">prepareElements()</script>
<![endif]-->
</body>
</html>

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