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View Full Version : Image Rollover/Tooltip Won't Function Properly



yokopolaris
12-18-2010, 08:24 PM
First of all, hi everyone:) I'm new to the forum and relatively new to javascript. I just completed a course in it at university and I did pretty well but I think we all know "real life" coding is a whole other story.

Now, down to business. I'm writing up a script, derived from a sitepoint example (available for download here (http://www.sitepoint.com/books/javascript1/code.php)). I want to bring up a dynamic tool tip, on mousover of a thumbnail, that contains one large picture. The style for the tooltip is handled in the css sheet and therefor not featured here. I am also using the sitepoint Core library, similarly available for download at the aforementioned link.

I've been working on this for a while with no success. Here's what I know for certain so far:

the showTipListener is running on mouseover
the span and the img are being created
the img is receiving the correct src
the img is being attached to the span
the span is being attached to the thumbnail


What I don't know is why the tooltip never appears and why the default action is not being canceled. Any thoughts would be greatly appreciated, thanks in advance for your help!

I've published the page here (http://www.coldgraphite.com/Explo) so that you all can observe it's behavior.

An of course here's the code

// JavaScript Document
var Tooltips =
{
//contains the source for each full sized image
fullImages: [
"PhotoPortfolio/AdriSelfPortraits.jpg",
"PhotoPortfolio/AmyUtah.jpg",
"PhotoPortfolio/AveQ.jpg",
"PhotoPortfolio/Bingham.jpg",
"PhotoPortfolio/BinghamD12.jpg",
"PhotoPortfolio/Campus.jpg",
"PhotoPortfolio/Campus2.jpg",
"PhotoPortfolio/Clambake.jpg",
"PhotoPortfolio/Construction.jpg",
"PhotoPortfolio/DadInKobeJapan.jpg",
"PhotoPortfolio/DadInTheGarden.jpg",
"PhotoPortfolio/HesperSongWriter.jpg",
"PhotoPortfolio/IrishCoast.jpg",
"PhotoPortfolio/NathanHale.jpg",
"PhotoPortfolio/NorthConway.jpg",
"PhotoPortfolio/Oreo.jpg",
"PhotoPortfolio/Portsmouth.jpg",
"PhotoPortfolio/Portsmouth2.jpg",
"PhotoPortfolio/Portsmouth3.jpg",
"PhotoPortfolio/RockClimbing.jpg",
"PhotoPortfolio/RockClimbing2.jpg",
"PhotoPortfolio/RockClimbing3.jpg",
"PhotoPortfolio/RockClimbing4.jpg",
"PhotoPortfolio/RockClimbing5.jpg",
"PhotoPortfolio/RockClimbing6.jpg",
"PhotoPortfolio/RockClimbing7.jpg",
"PhotoPortfolio/Seaport.jpg",
"PhotoPortfolio/Seaport2.jpg",
"PhotoPortfolio/Snowbird.jpg",
"PhotoPortfolio/VanderbuiltSkies.jpg",
"PhotoPortfolio/VanderbuiltSkies2.jpg",
],
init: function()
{
//collects all the images on the page with the RollOverMe class and stroes them in image
var image = Core.getElementsByClass("RollOverMe");
//adds the event listener to all images' mouseover and mouseout events
for (i=0; i<image.length; i++)
{
Core.addEventListener(image[i], "mouseover", Tooltips.showTipListener);
Core.addEventListener(image[i], "mouseout", Tooltips.hideTipListener);
}
},

showTip: function(image)
{
//retrieve the class number and strip out the string characters, store the number to a variable
var sourceMatch = /(^| )source(\d+)( |$)/.exec(image.className);
var source = parseInt(sourceMatch[2], 10);
//creates a span element
var tip = document.createElement("span");
//assigns it to the class tooltip
tip.className = "tooltip";
//creates an image
var tipImage = document.createElement('img');
//sets the src attribute to appropriate element in the fullImages property using the variable source
tipImage.src = Tooltips.fullImages[source];
//attaches the image to the span
tip.appendChild(tipImage);
//attaches the span to the thumbnail
image.appendChild(tip);
//sets the tooltip property to display the span
image._tooltip = tip;
// Fix for Safari2/Opera9 repaint issue
document.documentElement.style.position = "relative";
},

hideTip: function(image)
{
if (image._tooltip)
{
image.removeChild(image._tooltip);
image._tooltip = null;

// Fix for Safari2/Opera9 repaint issue
document.documentElement.style.position = "static";
}
},

showTipListener: function(event)
{
Tooltips.showTip(this);
Core.preventDefault(event);
},

hideTipListener: function(event)
{
Tooltips.hideTip(this);
}
};
Core.start(Tooltips)



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