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Use Image-Map-Resizer to keep traditional HTML image-map hotspots aligned as their image changes size. Add the library after your image-map markup, then call imageMapResize() in vanilla JavaScript—or use its jQuery plugin form. You can initialize every map or target a particular <map> with a selector.
What Image-Map-Resizer does
An HTML image map associates an image with clickable regions defined by <area> elements inside a <map>. The areas’ coords values describe positions on the image. When the displayed image is resized, those original coordinates no longer match its new dimensions unless they are adjusted.
Image-Map-Resizer is a client-side JavaScript library that detects window resizing and updates image-map coordinates so the regions stay aligned with the image. It works without jQuery or as a jQuery plugin. It adjusts existing HTML image maps; it does not replace them with SVG or canvas.
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Use npm
For a project using npm, install the package with:
npm i image-map-resizerThe npm registry lists version 1.0.10. The project documentation says version 1.0 is optimized for IE9 and newer. If a project still needs IE8, the documentation directs users to the older 0.6.x line, described there as functionally equivalent.
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Use the built script
If you are not installing through npm, include the built imageMapResizer.min.js file in your page. Make sure the file is available at the path used by the script’s src attribute. The example below assumes that it sits alongside the HTML page; change the path if your project serves it from a different location.
Set up a responsive image map with vanilla JavaScript
Put the image and its associated map in the page, include the library, and call imageMapResize() after the map markup. This complete example targets one map by its ID:
<img src="map.png" usemap="#store-map" alt="Store floor plan">
<map name="store-map" id="store-map">
<area shape="rect" coords="10,10,100,80" href="/aisle-1" alt="Aisle 1">
</map>
<script src="imageMapResizer.min.js"></script>
<script>
imageMapResize('map#store-map');
</script>The image’s usemap value refers to the map’s name with a leading #. The selector passed to the library targets the map element by its id. Keep those values consistent: the image must refer to the intended map, and the selector must match the map you want the library to initialize.
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Calling imageMapResize() with no argument initializes maps generally. If you want to limit initialization, pass a selector such as map.myMap, or pass a direct map object. The function returns the map elements to which it bound. Use a selector when a page has multiple maps and only some should be managed by this call.
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// Initialize maps generally
imageMapResize();
// Initialize maps matching a CSS selector
imageMapResize('map.myMap');Use the form that fits your markup. For a single map, a selector makes the target explicit; for a page where all maps should be initialized, the no-argument call is concise.
Place initialization after the markup
The simplest placement is near the bottom of the page, after the image, map, and library script have been included. That ensures the map element exists when the initialization call runs. If your application controls when the relevant markup is created, call the initializer after that markup is available rather than before it.
Initialize with jQuery
If the project already uses jQuery, include both jQuery and Image-Map-Resizer, then call the plugin on the map elements:
<script src="jquery.js"></script>
<script src="imageMapResizer.min.js"></script>
<script>
$('map').imageMapResize();
</script>To wait until the document is ready, the project documentation also shows this pattern:
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$(document).ready(function () {
$('map').imageMapResize();
});Choose either initialization style; the jQuery form is not required. If you do use it, load jQuery before the library and run the plugin call only after the relevant map elements are available.
Check that the map stays aligned
- Confirm the initial markup. The image’s
usemapvalue should point to the intended map name, and each area should have the coordinates and shape you intend to use. - Confirm the library loads. Check that the script path resolves to the built file and that the initialization call runs after the map markup.
- Resize the browser window. The library is intended to detect window resizing and update the map coordinates as the image changes size. Check whether the clickable regions remain over their intended parts of the image.
- Check the selected map. If you pass a selector, make sure it matches the actual
<map>element. If there are multiple maps, verify that the call targets the ones you intend.
Options and compatibility to consider
Vanilla JavaScript or jQuery
Vanilla JavaScript avoids adding a jQuery dependency solely for map resizing. The jQuery plugin call can be convenient when a project already uses jQuery. Both approaches initialize the library; choose based on the dependencies and conventions of your page.
Targeting maps
You can initialize maps generally, use a CSS selector to limit the targets, or pass a direct map object. The function returns the map elements it bound. This is useful when a page contains multiple maps and you want to make the intended targets explicit.
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The package documentation describes version 1.0 as optimized for IE9 and newer. It directs projects requiring IE8 to the 0.6.x line and describes that line as functionally equivalent. The project is MIT licensed; consult the license terms for your use case.
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Troubleshooting
Hotspots do not move with the image
- Verify that the library file loaded successfully and that the initialization call runs after the map markup.
- Check that the call targets the right map. A selector typo can leave the intended map uninitialized.
- Resize the browser window to check the behavior the library is designed to handle: updating coordinates as the image changes size.
The image and map do not appear associated
- Compare the image’s
usemapreference with the map’sname. The reference should use the map name with a leading#, as inusemap="#store-map". - Check that the map markup is present and that its
<area>elements describe the regions you expect.
The jQuery call is not recognized
- Make sure jQuery is included before Image-Map-Resizer and before the plugin call.
- Run the call after the map markup is available. The documented document-ready wrapper is one way to wait for DOM readiness.
- If jQuery is not otherwise needed, use the vanilla JavaScript API instead.
IE8 is a requirement
The project documentation says version 1.0 is optimized for IE9 and newer and points IE8 projects to the 0.6.x line. Choose the version line based on the browser support requirement rather than assuming version 1.0 covers IE8.
Performance and project-fit notes
Image-Map-Resizer is intended for existing HTML image maps and responds to window resizing by updating their coordinates. The available project information does not establish independent performance benchmarks, adoption totals, or a measured limit on the number of maps or areas. If a page’s map behavior is important, validate it in the browsers and layouts your project supports.
It is a natural fit when you need to preserve traditional <map> and <area> markup while making the displayed image responsive. If you are deciding whether to use image maps at all, compare that approach with alternatives such as SVG or canvas against your interaction and accessibility requirements; this library’s documented role is to resize existing image maps, not to make that broader design choice.
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License and project notes
The project is MIT licensed. Its README also links to a WordPress port by @iankevinmcdonald. The original library is the relevant choice for a page where you control the HTML and want to keep its image-map hotspots aligned during resizing.
Frequently Asked Questions
Does Image-Map-Resizer require jQuery?
No. It has a vanilla JavaScript API as well as a jQuery plugin form.
Can I initialize only one image map?
Yes. Pass a selector such as map#store-map or a direct map object to target particular map elements.
Which browsers does version 1.0 support?
The project documentation describes version 1.0 as optimized for IE9 and newer; it directs IE8 projects to the 0.6.x line.
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