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Responsive image maps (vanilla JS)
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| function fixImageMaps(force) { | |
| var imgs = document.querySelectorAll("img[usemap]"); | |
| [].forEach.call(imgs, function(img) { | |
| if (!img.naturalHeight) { return; } | |
| var h = img.height / img.naturalHeight; | |
| var w = img.width / img.naturalWidth; | |
| var map = document.getElementsByName(img.useMap.slice(1))[0]; | |
| if (!map) { return; } | |
| for (var i = 0; i < map.children.length; i++) { | |
| var area = map.children[i]; | |
| if (!area.coords) { continue; } | |
| var coords = area.coords; | |
| if (!area.originalCoords) { | |
| area.originalCoords = coords; | |
| } else { | |
| coords = area.originalCoords; | |
| } | |
| var split = coords.split(",") | |
| var fixed = ""; | |
| split.forEach(function(coord, n) { | |
| if (n != 0) { fixed += ","; } | |
| fixed += n % 2 == 0 ? Number(coord) * w : Number(coord) * h; | |
| }) | |
| area.coords = fixed; | |
| } | |
| }); | |
| } | |
| window.onresize = fixImageMaps; | |
| window.onload = fixImageMaps; |
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