JavaScript image width

We can assign or read the width of the image by JavaScript image object properties. We will use getElementById to manage our image.

Let us start with reading the width of an image
var y=document.getElementById("i1").width;
Here i1 is the image object.

Assigning width to an image

document.getElementById("i1").width=200;
We have assigned 200 to the width of the object Here is the code.
<html>
<head>
<title>Demo of changing width of an Image in JavaScript</title>
<link rel="stylesheet" href="../images/all11.css" type="text/css">
<script language='JavaScript' type='text/JavaScript'>
<!--
function resize_img(st) {
var y=document.getElementById("i1").width;
if(st=='up'){
if(y<300){
y=y*2;
}
}else{
if(y>5){
y=y/2;
}
}
document.getElementById("i1").width=y;
document.getElementById("i1").height=7;
}
//-->
</script>
</head>
<body>
<input type=button onClick=resize_img('up') value='Expand'>
<input type=button onClick=resize_img('down') value='Compress'>
<br><br><br><br><br><br>
<img src=images/help.jpg id='i1'>
<br><br>

</body>
</html>


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More on JavaScript Image Object
Image SlideShow Script using navigational buttons
Image Loading to cache while page load by Image object
Reloading the image without refreshing the page
Image Rotator Script for automatic Slideshow
Image Move across by button click
Image Move continuously across screen
Image offSetLeft and offSetTop to get position of the image from left and top
Image Position : Positioning an image by assigning value to style.top and style.left
Image width: Managing width of the image
Image height: managing height of the image
Image align: Image align left or right
Image border: adding and removing border from Image
Image alt: updating or reading alt message of image

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