Resizing image maps dynamically with JavaScript involves a few steps:
Determine the size of the image element dynamically using JavaScript.
Then we modify the coordinates of the areas within the image map to match the new size of the image.
Finally we update the image map with the new coordinates.
For example we write:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Dynamic Image Map Resizing</title>
<script>
function resizeImageMap() {
var img = document.getElementById('resizable-image');
var width = img.clientWidth;
var height = img.clientHeight;
var areas = document.getElementsByTagName('area');
for (var i = 0; i < areas.length; i++) {
var coords = areas[i].getAttribute('coords').split(',');
for (var j = 0; j < coords.length; j++) {
if (j % 2 === 0) {
coords[j] = Math.round((coords[j] / img.naturalWidth) * width);
} else {
coords[j] = Math.round((coords[j] / img.naturalHeight) * height);
}
}
areas[i].setAttribute('coords', coords.join(','));
}
}
</script>
</head>
<body>
<img id="resizable-image" src="example.jpg" onload="resizeImageMap()">
<map name="image-map">
<area shape="rect" coords="10,10,50,50" href="#">
<area shape="circle" coords="100,100,30" href="#">
</map>
</body>
</html>
In this example, resizeImageMap() is called when the image is loaded.
It calculates the width and height of the image and adjusts the coordinates of the areas accordingly.
We can adapt this code to fit your specific requirements and improve it further, such as handling different types of shapes in the image map or updating the image map dynamically as the window is resized.
