<!DESCRIPTION>This script is intended for forms where the user needs to upload an image to a Web site. The image is displayed on the page for previewing before uploading. The display will be resized if needed so as not to break the page layout. Valid file types are set in the script; others will be disallowed. Works only in Internet Explorer but degrades gracefully. <!/DESCRIPTION>
<!CATEGORY>Forms<!/CATEGORY>
<!SCRIPT>
<!-- START OF SCRIPT -->
<!-- HOW TO INSTALL IMAGE UPLOAD PREVIEW:
1. Copy code into the HEAD section of document
2. Put last coding into the BODY section of document -->
<!-- STEP ONE: Add code into HEAD section of document -->
<HEAD>
<script type="text/javascript">
<!-- Begin
/*
Created by: Abraham Joffe :: http://www.abrahamjoffe.com.au/ */
/***** CUSTOMIZE THESE VARIABLES *****/
// width to resize large images to
var maxWidth=100;
// height to resize large images to
var maxHeight=100;
// valid file types
var fileTypes=["bmp","gif","png","jpg","jpeg"];
// the id of the preview image tag
var outImage="previewField";
// what to display when the image is not valid
var defaultPic="spacer.gif";
/***** DO NOT EDIT BELOW *****/
function preview(what){
var source=what.value;
var ext=source.substring(source.lastIndexOf(".")+1,source.length).toLowerCase();
for (var i=0; i<fileTypes.length; i++) if (fileTypes[i]==ext) break;
globalPic=new Image();
if (i<fileTypes.length) globalPic.src=source;
else {
globalPic.src=defaultPic;
alert("THAT IS NOT A VALID IMAGE\nPlease load an image with an extention of one of the following:\n\n"+fileTypes.join(", "));
}
setTimeout("applyChanges()",200);
}
var globalPic;
function applyChanges(){
var field=document.getElementById(outImage);
var x=parseInt(globalPic.width);
var y=parseInt(globalPic.height);
if (x>maxWidth) {
y*=maxWidth/x;
x=maxWidth;
}
if (y>maxHeight) {
x*=maxHeight/y;
y=maxHeight;
}
field.style.display=(x<1 || y<1)?"none":"";
field.src=globalPic.src;
field.width=x;
field.height=y;
}
// End -->
</script>
</HEAD>
<!-- STEP TWO: Add code into BODY section of document -->
<BODY>
<div align="center" style="line-height: 1.9em;">
Test it by locating a valid file on your hard drive:
