Image Effects : Image Navigator / The JavaScript Source

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General

This script works by sliding the background image of one DIV element, using the background-position to correspond with the coordinates of another DIV. Great for showing details in a small space.

Click and drag the red outlined square on the bottom photo to navigate the zoomed image.

Notes

Created by: Steve Chipman
Web Site: http://slayeroffice
Posted: August 13, 2008

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: imageNavigator.js

/* This script and many more are available free online at
The JavaScript Source!! http://javascript.internet.com
Created by: Steve Chipman | http://slayeroffice */

var mDown = false;
var offsetX=0;
var offsetY=0;
function init() {
	document.onmousedown = captureMouseDown;
	document.onmousemove = captureMouseMove;
	document.onmouseup = captureMouseUp;
	document.getElementById("marker").onmousedown = captureOffset;
	document.getElementById("marker").style.top = "0px";
	document.getElementById("marker").style.left = "0px";
}

function captureOffset(e) {
	x = parseInt(document.getElementById("marker").style.left);
	y = parseInt(document.getElementById("marker").style.top);
	if(document.all) {
		offsetX=window.event.clientX - x;
		offsetY=window.event.clientY - y;
	} else {
		offsetX = e.pageX - x;
		offsetY = e.pageY - y;
	}
}

function captureMouseDown() {
	mDown=true;
}

function captureMouseUp() {
	mDown = false;
}

function captureMouseMove(e) {
	if(!mDown)return;
	x = document.all?window.event.clientX - offsetX:e.pageX - offsetX;
	y = document.all?window.event.clientY - offsetY:e.pageY - offsetY;
	
	if(x<=-1 || x>=175 || y<=-1 || y >= 105)return;
	document.getElementById("marker").style.left = x + "px";	
	document.getElementById("marker").style.top = y + "px";

	x2 = parseInt(document.getElementById("marker").style.left);
	y2 = parseInt(document.getElementById("marker").style.top);
	x2 = (x2 - (x2*2))*2; 
	y2 = (y2 - (y2*2))*2;
	document.getElementById("largeImage").style.backgroundPosition = x2 + "px " + y2 + "px";
}

// Multiple onload function created by: Simon Willison
// http://simonwillison.net/2004/May/26/addLoadEvent/
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  init();
});

CSS

Paste this code into your external CSS file or in the <style> section within the HEAD section of your HTML document.

#largeImage {
	position:relative;
	width:150px;
	height:100px;
	border:1px solid #000000;
	background-image:url("testz.gif");
	background-repeat:no-repeat;
	background-position:0px 0px;
}

#smallImage {
	position:relative;
	border:1px solid #000000;
	margin-top:5px;
	width:250px;
	height:155px;
}

#marker {
	position:absolute;
	top:0px;
	left:0px;
	border:1px solid #FF0000;
	width:75px;
	height:50px;
	cursor:pointer;
	background-image:url("tp.gif");
}

Head

Paste this code into the HEAD section of your HTML document.


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

Body

Paste this code into the BODY section of your HTML document


<p>
Click and drag the red outlined square on the bottom photo to navigate the zoomed image.</p>
<div id="largeImage"></div>
<div id="smallImage">
<!--  This image must actually be double the size listed below  -->
  <img src="testz.gif" width="250" height="155">
	<div id="marker"></div>
</div>

User Comments

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Navigation Menu

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Developer Channel

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General

Notes

Source Code

External file

CSS

Head

Body

User Comments

1. From: Charles Quinlan
works great
08/16/2008 14:46:01

Whitepapers and eBooks

Webcasts

Downloads and eKits

Tutorials and Demos

Navigation Menu

Internet.commerce

Internet.com

Developer Channel

Great Sites

Promotions

General

Notes

Source Code

External file

CSS

Head

Body

User Comments

1. From: Charles Quinlanworks great08/16/2008 14:46:01

Whitepapers and eBooks

Webcasts

Downloads and eKits

Tutorials and Demos

1. From: Charles Quinlan
works great
08/16/2008 14:46:01