Full version: jsB@nk » Image » Image viewer » Image previewer
URL: https://www.javascriptbank.com/image-previewer.html
This JavaScript 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.
Full version: jsB@nk » Image » Image viewer » Image previewer
URL: https://www.javascriptbank.com/image-previewer.html
<script type="text/javascript"><!-- Begin/*Created by: Abraham Joffe :: http://www.abrahamjoffe.com.au/ *//***** CUSTOMIZE THESE VARIABLES *****/ // width to resize large images tovar maxWidth=100; // height to resize large images tovar maxHeight=100; // valid file typesvar fileTypes=["bmp","gif","png","jpg","jpeg"]; // the id of the preview image tagvar outImage="previewField"; // what to display when the image is not validvar 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><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><b>Test it by locating a valid file on your hard drive:</b><br><input type="file" id="picField" onchange="preview(this)"><br><img alt="Graphic will preview here" id="previewField" src="logojs.gif"><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->