Adding hover effects for links in image map (area)

Question

I'm only a beginner in html and I would like to put hover effects for my image map. I have searched for lots of solutions but I only come up with solutions using script which I don't understand.

How does this script work? I tried using

area:hover {
border: 1px solid white;
}

But it does not work.

Hematite

That's CSS, not script. It goes in your stylesheet. – Aker

sorry bout that, I didn't mean to add the word 'this'. lol sorry – Hematite

Answer 1

What you're trying to do is not very simple, you will have to combine javascript and css or jquery to give the effect you want.

It's because the area element doesn't accept hover directly, unfortunately...

But the good news is that it was answered before here:

How to apply Hovering on html area tag?

Visible Area tag?

Voroshilov

Answer 2

The following JS and CSS makes image(map)s responsive and adds a hover effect to the areas.

var images = document.querySelectorAll('img[usemap]');
images.forEach( function(image) {
    var mapid = image.getAttribute('usemap').substr(1);
    var imagewidth = image.getAttribute('width');
    var imageheight = image.getAttribute('height');
    var imagemap = document.querySelector('map[name="'+mapid+'"]');
    var areas = imagemap.querySelectorAll('area');

    image.removeAttribute('usemap');
    imagemap.remove();

    // create wrapper container
    var wrapper = document.createElement('div');
    wrapper.classList.add('imagemap');
    image.parentNode.insertBefore(wrapper, image);
    wrapper.appendChild(image);

    areas.forEach( function(area) {
        var coords = area.getAttribute('coords').split(',');
        var xcoords = [parseInt(coords[0]),parseInt(coords[2])];
        var ycoords = [parseInt(coords[1]),parseInt(coords[3])];
        xcoords = xcoords.sort(function(a, b){return a-b});
        ycoords = ycoords.sort(function(a, b){return a-b});
        wrapper.innerHTML += "<a href='"+area.getAttribute('href')+"' title='"+area.getAttribute('title')+"' class='area' style='left: "+((xcoords[0]/imagewidth)*100).toFixed(2)+"%; top: "+((ycoords[0]/imageheight)*100).toFixed(2)+"%; width: "+(((xcoords[1] - xcoords[0])/imagewidth)*100).toFixed(2)+"%; height: "+(((ycoords[1] - ycoords[0])/imageheight)*100).toFixed(2)+"%;'></a>";
    });
});

img {max-width: 100%; height: auto;}

.imagemap {position: relative;}
.imagemap img {display: block;}
.imagemap .area {display: block; position: absolute; transition: box-shadow 0.15s ease-in-out;}
.imagemap .area:hover {box-shadow: 0px 0px 1vw rgba(0,0,0,0.5);}

<!-- Image Map Generated by http://www.image-map.net/ -->
<img src="https://i.imgur.com/TwmCyCX.jpg" width="2000" height="2604" usemap="#image-map">
<map name="image-map">
    <area target="" alt="Zirconia Abutment" title="Zirconia Abutment" href="/" coords="3,12,199,371" shape="rect">
    <area target="" alt="Gold Abutment" title="Gold Abutment" href="/" coords="245,12,522,371" shape="rect">
    <area target="" alt="CCM Abutment" title="CCM Abutment" href="/" coords="564,12,854,369" shape="rect">
    <area target="" alt="EZ Post Abutment" title="EZ Post Abutment" href="/" coords="1036,12,1360,369" shape="rect">
    <area target="" alt="Milling Abutment" title="Milling Abutment" href="/" coords="1390,12,1688,369" shape="rect">
    <area target="" alt="Angled Abutment" title="Angled Abutment" href="/" coords="1690,12,1996,371" shape="rect">
    <area target="" alt="Temporary Abutment [Metal]" title="Temporary Abutment [Metal]" href="/" coords="45,461,506,816" shape="rect">
    <area target="" alt="Fuse Abutment" title="Fuse Abutment" href="/" coords="1356,461,1821,816" shape="rect">
    <area target="" alt="Lab Analog" title="Lab Analog" href="/" coords="718,935,1119,1256" shape="rect">
    <area target="" alt="Transfer Impression Coping Driver" title="Transfer Impression Coping Driver" href="/" coords="8,1330,284,1731" shape="rect">
    <area target="" alt="Impression Coping [Transfer]" title="Impression Coping [Transfer]" href="/" coords="310,1330,697,1731" shape="rect">
    <area target="" alt="Impression Coping [Pick-Up]" title="Impression Coping [Pick-Up]" href="/" coords="1116,1330,1560,1733" shape="rect">
</map>

Orphrey

this solution will work only for rectangles and may be circles, but not for polygons – Bekki