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Thread: bg flickers on mouseOver, in all browsers

  1. #1
    Join Date
    Feb 2009
    Posts
    2

    bg flickers on mouseOver, in all browsers

    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>

  2. #2
    Join Date
    Oct 2007
    Posts
    175
    your link seems to work in Firefox 3 and IE 7 without any flickering.
    "The one who's closer to the truth is the one still looking"
    Jodarecode "Hence" - Chaos -

  3. #3
    Join Date
    Feb 2003
    Location
    Michigan, USA
    Posts
    5,774
    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?

  4. #4
    Join Date
    Feb 2009
    Posts
    2
    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>
    Last edited by Sheynberg; 02-26-2009 at 06:50 PM.

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