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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