Wednesday, March 16, 2011

Image Handler and Internet Explorer 9

Edited 17 March to remove testing code - Thanks Steve.

Image Handler is a zencart plugin for those who don't know

IE9 was released recently and is an improvement in all ways.

Unfortunately though IE9 breaks Image Handlers javascript hover function, once the page is fully loaded the hover doesn't work correctly although it works in every other browser and in IE9s compatibility mode.

Anyway i have fixed it, the below is a replacement Image Handlers javascript file, if your js file is version 4.2 or older it needs replacing.

How to use the code

Open your

zencart -> Includes -> templates -> your template -> jscript
jscript_imagehover.js file



Delete all the code in that file, then paste the code below into that file and upload
/*
Simple Image Trail script- By JavaScriptKit.com
Visit http://www.javascriptkit.com for this script and more
This notice must stay intact

Simple Image Trail script- By JavaScriptKit.com was originally modified by Tim Kroeger (tim@breakmyzencart.com) 
for use with Image Handler 2 and better cross browser functionality

Later the Simple Image Trail script- By JavaScriptKit.com was further modified by 
p.hailey@virgin.net in an attempt to  fix ie 6 issues see zencart forum IH2 thread
for detials

Image Handler Jscript
Version 4.3
Modified by Nigel Thomson (nigel@nigel.geek.nz) 12 June 2010
This  modified version of the Simple Image Trail script- By JavaScriptKit.com (4.1) brings in Opera 
support, and fixes the webkit (Safari and Chrome) Bugs
Fix for horizontalscrollbar added 23 june 2010
http://nigeltsblog.blogspot.com/2010/06/zencart-image-handler-webkit-and-opera.html
Fix for IE9 added 16 March 2011
http://nigeltsblog.blogspot.com/2011/03/image-handler-and-internet-explorer-9.html
*/

var offsetfrommouse=[10,10]; //image x,y offsets from cursor position in pixels. Enter 0,0 for no offset
var displayduration=0; //duration in seconds image should remain visible. 0 for always.
var currentimageheight = 400;    // maximum image size.
var padding=10; // padding must by larger than specified div padding in stylessheet

// Global variables for sizes of hoverimg
// Defined in "showtrail()", used in "followmouse()"
var zoomimg_w=0;
var zoomimg_h=0;
var vpos;
//Detect IE
var stIsIE = /*@cc_on!@*/false;
//detect opera
var isOpera =
window.opera?1:0;
// Detect Webkit browsers
var isWebKit =
navigator.userAgent.indexOf("AppleWebKit") > -1;

if (document.getElementById || document.all){
document.write('<div id="trailimageid">');
document.write('</div>');
}

function getObj(name) {
if (document.getElementById) {
this.obj = document.getElementById(name);
this.style = document.getElementById(name).style;
} else if (document.all) {
this.obj = document.all[name];
this.style = document.all[name].style;
} else if (document.layers) {
this.obj = document.layers[name];
this.style = document.layers[name];
}
}

function gettrail(){
return new getObj("trailimageid");
}

function truebody(){
if (isWebKit){
return document.body;
}else if (isOpera) {
return document.documentElement;
}else{

return (!window.opera && document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}
}

function showtrail(imagename,title,oriwidth,oriheight,zoomimgwidth,zoomimgheight, image, startx, starty, startw, starth){
zoomimg_w=zoomimgwidth;
zoomimg_h=zoomimgheight;
if (zoomimgheight > 0){ currentimageheight = zoomimgheight; }
trailobj = gettrail().obj;
trailobj.style.width=(zoomimgwidth+(2*padding))+"px";
trailobj.style.height=(zoomimgheight+(2*padding))+"px";
trailobj.setAttribute("startx", startx);
trailobj.setAttribute("starty", starty);
trailobj.setAttribute("startw", startw);
trailobj.setAttribute("starth", starth);
trailobj.setAttribute("imagename", imagename);
trailobj.setAttribute("imgtitle", title);
document.onmousemove=followmouse;
}

function hidetrail(){
trailstyle = gettrail().style;
trailstyle.visibility = "hidden";
document.onmousemove = "";
trailstyle.left = "-2000px";
trailstyle.top = "-2000px";
}

function followmouse(e){

var xcoord=offsetfrommouse[0];
var ycoord=offsetfrommouse[1];
if (stIsIE){
var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15;
var docheight=document.all? Math.min(truebody().scrollHeight, truebody().clientHeight) : Math.min(window.innerHeight);
}
else
{
var docwidth=pageXOffset+window.innerWidth-15;
var docheight=Math.min(window.innerHeight);

}
var relativeX = null;
var relativeY = null;
if ((typeof e != "undefined") && !(stIsIE)){ // This forces IE9 to go to the else option
if ((typeof e.layerX != "undefined") && (typeof e.layerY != "undefined")) {
relativeX = e.layerX;
relativeY = e.layerY;
} else if ((typeof e.x != "undefined") && (typeof e.y != "undefined")) {
//      relativeX = e.x; // original code replaced to work with Opera
//      relativeY = e.y; // original code replaced to work with Opera
relativeX = event.offsetX;
relativeY = event.offsetX;
}
if (docwidth - e.pageX < zoomimg_w + (3 * padding)) {
xcoord = e.pageX - xcoord - zoomimg_w - (2 * offsetfrommouse[0]);
} else {
xcoord += e.pageX;
}
if (docheight - e.pageY < zoomimg_h + (2 * padding)){
ycoord += e.pageY - Math.max(0,(0 + zoomimg_h + (5 * padding) + e.pageY - docheight - truebody().scrollTop));
// returning different values for ff and (opera and webkit) - fixed 12th june 2010
} else {
ycoord += e.pageY;
}

} else if (typeof window.event != "undefined"){ // This works for IE

if ((typeof event.x != "undefined") && (typeof event.y != "undefined")) {
relativeX = event.x;
relativeY = event.y;
} 
else if ((typeof event.offsetX != "undefined") && (event.offsetY != "undefined")) {
relativeX = event.offsetX;
relativeY = event.offsetY;
}

if (docwidth - event.clientX < zoomimg_w + (3 * padding)) {
xcoord = event.clientX - xcoord - zoomimg_w - (2 * offsetfrommouse[0]);
} else {
xcoord += truebody().scrollLeft+event.clientX;
}
/* event.clientY is not valid in firefox netscape or opera, but ie has to use it */
var ie_offset = -20;
if ( docheight - event.clientY < zoomimg_h + (2 * padding) ){
/*
ycoord += event.clientY - Math.max(0,(0 + zoomimg_h + (5 * padding) - (docheight + truebody().scrollTop -event.clientY) ) );
*/
ycoord += ie_offset + truebody().scrollTop + event.clientY - Math.max(0,(0 + zoomimg_h + (2 * padding) - (docheight - event.clientY) ) );
} else {
ycoord += ie_offset + truebody().scrollTop + event.clientY;
}
}

trail = gettrail();
startx    = trail.obj.getAttribute("startx");
starty    = trail.obj.getAttribute("starty");
startw    = trail.obj.getAttribute("startw");
starth    = trail.obj.getAttribute("starth");
imagename = trail.obj.getAttribute("imagename");
title     = trail.obj.getAttribute("imgtitle");

// calculate and set position BEFORE switching to visible
if (stIsIE){
var docwidth=document.all? truebody().scrollLeft+truebody().clientWidth : pageXOffset+window.innerWidth-15;
var docheight=document.all? Math.max(truebody().scrollHeight, truebody().clientHeight) : Math.max(document.body.offsetHeight, window.innerHeight);
}else{
var docwidth=pageXOffset+window.innerWidth-15;
var docheight=Math.max(document.body.offsetHeight, window.innerHeight);
}

if(ycoord < 0) { ycoord = ycoord*-1; }
if ((trail.style.left == "-2000px") || (trail.style.left == "")) { trail.style.left=xcoord+"px"; }
if ((trail.style.top == "-2000px") || (trail.style.top == "")) { trail.style.top=ycoord+"px"; }
trail.style.left=xcoord+"px";
trail.style.top=ycoord+"px";

if (trail.style.visibility != "visible") {
if (((relativeX == null) || (relativeY == null)) ||
((relativeX >= startx) && (relativeX <= (startx + startw))
&& (relativeY >= starty) && (relativeY <= (starty + starth)))){
newHTML = '<div><h1>' + title + '</h1>';
newHTML = newHTML + '<img src="' + imagename + '"></div>';
trail.obj.innerHTML = newHTML;
trail.style.visibility="visible";
}
}
}
and then save the file and upload it to your server, and IE9 should work correctly

3 comments:

Anonymous said...

did you mean to leave this
alert('hello3');
uncommented

cheers
Steve

Nigel said...

Cheers Steve, i completely missed that, updating it now.
Thanks

Mary said...

thanks will alter the file you said to.

Mary [darkangel]