script for enlarge image choice on rollover

[spollard]

I want my image choices to gradually enlarge when you rollover them like this http://www.uniformcorner.com/testJava.htm except i am not sure where to put the script. I tried adding to the Radio Button Choice layout but it gives me a parse error. We have several different colors/prints for each top. i/ehttp://www.uniformcorner.com/acatalo..._neck_top.html I would like to have the small swatch enlarge so that I do not have to have the external page with the enlarged images & matching colors.

any thoughts or suggestions?

[TraceyHand]

Check out Norman's multi choice images patch at drillpine.biz
For the price, it's probably more economical to invest in this that make any attempt at doing your own (unless you're a Norm-type wizz but, if that were the case, I doubt you'd be asking )

[NormanRouxel]

Try this - untested!
Make a file called "imagemagnify.js" in your Site folder from the following:

/**
The JavaScript functions below will gradually enlarge or shrink an image
on the current page. I use this for mouseover effects, but there might be
some other interesting applications of it as well.

You can use these scripts in any way you'd like, just don't pretend like
you wrote them yourself.

version 1.0
March 17, 2005
Julian Robichaux, http://www.nsftools.com
*/

/**** adjust these two parameters to control how fast or slow
 **** the images grow/shrink ****/
// how many milliseconds we should wait between resizing events
var resizeDelay = 10;
// how many pixels we should grow or shrink by each time we resize
var resizeIncrement = 5;

// this will hold information about the images we're dealing with
var imgCache = new Object();


/**
The getCacheTag function just creates a (hopefully) unique identifier for
each <img> that we resize.
*/
function getCacheTag (imgElement) {
	return imgElement.src + "~" + imgElement.offsetLeft + "~" + imgElement.offsetTop;
}


/**
We're using this as a class to hold information about the <img> elements
that we're manipulating.
*/
function cachedImg (imgElement, increment) {
	this.img = imgElement;
	this.cacheTag = getCacheTag(imgElement);
	this.originalSrc = imgElement.src;
	
	var h = imgElement.height;
	var w = imgElement.width;
	this.originalHeight = h;
	this.originalWidth = w;
	
	increment = (!increment) ? resizeIncrement : increment;
	this.heightIncrement = Math.ceil(Math.min(1, (h / w)) * increment);
	this.widthIncrement = Math.ceil(Math.min(1, (w / h)) * increment);
}


/**
This is the function that should be called in the onMouseOver and onMouseOut
events of an <img> element. For example:

<img src='onesmaller.gif' onMouseOver='resizeImg(this, 150, "onebigger.gif")' onMouseOut='resizeImg(this)'>

The only required parameter is the first one (imgElement), which is a
reference to the <img> element itself. If you're calling from onMousexxx, 
you can just use "this" as the value.

The second parameter specifies how much larger or smaller we should resize
the image to, as a percentage of the original size. In the example above,
we want to resize it to be 150% larger. If this parameter is omitted, we'll
assume you want to resize the image to its original size (100%).

The third parameter can specify another image that should be used as the
image is being resized (it's common for "rollover images" to be similar but
slightly different or more colorful than the base images). If this parameter
is omitted, we'll just resize the existing image.
*/
function resizeImg (imgElement, percentChange, newImageURL) {
	// convert the percentage (like 150) to an percentage value we can use
	// for calculations (like 1.5)
	var pct = (percentChange) ? percentChange / 100 : 1;
	
	// if we've already resized this image, it will have a "cacheTag" attribute
	// that should uniquely identify it. If the attribute is missing, create a
	// cacheTag and add the attribute
	var cacheTag = imgElement.getAttribute("cacheTag");
	if (!cacheTag) {
		cacheTag = getCacheTag(imgElement);
		imgElement.setAttribute("cacheTag", cacheTag);
	}
	
	// look for this image in our image cache. If it's not there, create it.
	// If it is there, update the percentage value.
	var cacheVal = imgCache[cacheTag];
	if (!cacheVal) {
		imgCache[cacheTag] = new Array(new cachedImg(imgElement), pct);
	} else {
		cacheVal[1] = pct;
	}
	
	// if we're supposed to be using a rollover image, use it
	if (newImageURL)
		imgElement.src = newImageURL;
	
	// start the resizing loop. It will continue to call itself over and over
	// until the image has been resized to the proper value.
	resizeImgLoop(cacheTag);
	return true;
}


/**
This is the function that actually does all the resizing. It calls itself
repeatedly with setTimeout until the image is the right size.
*/
function resizeImgLoop (cacheTag) {
	// get information about the image element from the image cache
	var cacheVal = imgCache[cacheTag];
	if (!cacheVal)
		return false;
	
	var cachedImageObj = cacheVal[0];
	var imgElement = cachedImageObj.img;
	var pct = cacheVal[1];
	var plusMinus = (pct > 1) ? 1 : -1;
	var hinc = plusMinus * cachedImageObj.heightIncrement;
	var vinc = plusMinus * cachedImageObj.widthIncrement;
	var startHeight = cachedImageObj.originalHeight;
	var startWidth = cachedImageObj.originalWidth;
	
	var currentHeight = imgElement.height;
	var currentWidth = imgElement.width;
	var endHeight = Math.round(startHeight * pct);
	var endWidth = Math.round(startWidth * pct);
	
	// if the image is already the right size, we can exit
	if ( (currentHeight == endHeight) || (currentWidth == endWidth) )
		return true;
	
	// increase or decrease the height and width, making sure we don't get
	// larger or smaller than the final size we're supposed to be
	var newHeight = currentHeight + hinc;
	var newWidth = currentWidth + vinc;
	if (pct > 1) {
		if ((newHeight >= endHeight) || (newWidth >= endWidth)) {
			newHeight = endHeight;
			newWidth = endWidth;
		}
	} else {
		if ((newHeight <= endHeight) || (newWidth <= endWidth)) {
			newHeight = endHeight;
			newWidth = endWidth;
		}
	}
	
	// set the image element to the new height and width
	imgElement.height = newHeight;
	imgElement.width = newWidth;
	
	// if we've returned to the original image size, we can restore the
	// original image as well (because we may have been using a rollover
	// image in the original call to resizeImg)
	if ((newHeight == cachedImageObj.originalHeight) || (newWidth == cachedImageObj.originalwidth)) {
		imgElement.src = cachedImageObj.originalSrc;
	}
	
	// shrink or grow again in a few milliseconds
	setTimeout("resizeImgLoop('" + cacheTag + "')", resizeDelay);
}

Put the following into your overall layout, just above the </head> line.

<script type="text/javascript" src="imagemagnify.js"></script>

Create a second filename variable "ChoiceImageLarger" for each choice.
Make images that are 2 or 3 times larger then your icon and set ChoiceImageLarger to these files.

I'm assuming that you have one called "ChoiceImage" already.
And assuming that your bigger images are 3 times the small ones size.

Amend the code that creates your existing choice icon image, to something like:

<img src='<actinic:variable name="ChoiceImage" />' onMouseOver='resizeImg(this, 300, "<actinic:variable name="ChoiceImageLarger" />")' onMouseOut='resizeImg(this)'>

If you don't understand the above then read the source code of the page you linked to in your first post as it is heavily commented.

[spollard]

whiz I am not

I know enough to get myself in trouble!! Thanks!

[NormanRouxel]

I'm not shipping my Dynamic Choice Images patch at the moment due to this horrible Actinic bug.

[spollard]

I'll give it a shot in the morning and let you know!! - Thanks

[RuralWeb]

You may want to consider if adding all that commented code could affect your SERPS

[NormanRouxel]

Mal,

I put it into a separate .js file. Would that really affect SERPS?

[RuralWeb]

Missed that - if it's in a separate file then no it won't

[TraceyHand]

I'm not shipping my Dynamic Choice Images patch at the moment due to this horrible Actinic bug.

ah right, ok
Yes, I did have minor issues with that when I installed it last (although not showstoppingly so, thankfully!)

[jxm28788]

Check out Norman's multi choice images patch at drillpine.biz

Wow, that's pretty cool - I'd happily pay the £35 for that... but is it available for v7? and if so is the v7 version free of the horrible bug?

[Duncan Rounding]

Look on this page for v7:
http://www.drillpine.biz/actinicstuff/archive.html

v7 is not affected by the bug.

[NormanRouxel]

is it available for v7? and if so is the v7 version free of the horrible bug

See http://www.drillpine.biz/actinicstuff/archive.html and look for Dynamic Product Images. The V8/9 bug isn't in V7 but it's a kludgy patch compared with the V8/9 way of doing things.

This is a donationware add-on but note that I'm no longer provinding support for V7.

[jxm28788]

ok thanks, I'll take a look.