Hover over a building floor in HTML/CSS

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I'm trying to change the color of a floor when I hover it. https://imgur.com/a/pXEmNXp this is the image on which I'm trying to do it.

I tried the answer on this post: How can we draw 3D bulding structure from existing image Jquery,Css? but when I actually hover the floor it doesn't work, it only shows when I hover in a random place on the bottom of the image.

How can I do it so it shows that specific floor when I hover it, and how can I actually implement the map attribute for every floor?

Here's my code if it helps:

$(document).ready(function () {

        $('map').on('mouseenter', function () {
            $('.highlight-4').show();
        })

        $('map').on('mouseleave', function () {
            $('.highlight-4').hide();
        })
    });
.highlight {
     z-index: 9999;
     display: none;
     pointer-events: none;
  }

  .building {
     position: absolute;
     margin-left: 11%;
     box-shadow: 0 15px 30px rgba(0, 0, 0, .6);;
  }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
HTML

        <img class="highlight highlight-4" src="/static/floor-4.png" alt="">
        <img class="highlight highlight-3" src="/static/floor-3.png" alt="">
        <img class="highlight highlight-2" src="/static/floor-2.png" alt="">
        <img class="highlight highlight-1" src="/static/floor-1.png" alt="">
        <img class="highlight highlight-0" src="/static/floor-0.png" alt="">
        <img usemap="#image-map" class="building" src="/static/apartments.jpeg" alt="">
        <map name="image-map">
            <area target="" alt="" title="" href="" coords="1121,326,197,662,191,747,1130,473,1398,664,1387,544"
                shape="poly">
        </map>

1 Answers

Best way seems to implement your building image as an SVG file with <polyline> overlays. This way you can use CSS selectors and have much more control over your layouts. You can use <a> inside SVG, javascript, etc.

I took your image and loaded it in Draw SVG to create the required top floor <polyline>. After having saved the DrawSVG drawing locally I simply copied the <polyline> into my own SVG file, which, as you can see, works without any further HTML and added some CSS to do the highlighting on :hover.

You can insert this SVG into you html as if it were an <img>, it is just another tag (with benefits).

UPDATE

Revisited the original code I posted and replaced it with completely new code. The code is now a HTML page using an SVG file with the OPs image and showing how to use an <a> with some demo text on :hover (top floor again).

The HTML page has also been made 'responsive' by using math in CSS calc() and @media queries (go 'full-page' and resize browser, also check the page on various devices with the browser Developer Tools, 'portrait' and 'landscape' mode).

Explanation of the math can be found in other answers I gave on SO:

Now you create the other floors....

/*
    Visit below answers on Stackoverflow for an explanation
    of the math used for responsive sizing of elements.

    https://stackoverflow.com/a/62033317/2015909
    https://stackoverflow.com/a/61867702/2015909
*/
/**************************/
/* preferred global rules */
/**************************/
html,body               { box-sizing: border-box; width: 100%; max-width: 100%; height: 100% }
*::before,*::after, *   { box-sizing: inherit }
body                    { margin: 0 }

/* responsive base font size using y = mx + b */
html    { font-size: calc(0.625vmin + 0.75rem) } /* (320,14)(1280,20) */
body    { font-size: 1rem }

[band]  { display: flex; flex-flow: column wrap; align-content: center }

[padded="1"], [padded="0"] [band*="padded"] {
/*
    responsive page padding
    and responsive band padding (same as responsive page padding, but at band level)
    p1(320,32) p2(1920, 72) => 0.025x + 24
    p3(320, 8) p4(1920,320) => 0.195x - 54.4 

    'Band padding' is only active when 'page padding' is off 
*/
    padding: calc( 2.5vh + 24px) calc(19.5vw - 54.4px);
}

/* Making sure the image fits in any viewport, either portrait or landscape */
@media (orientation: portrait ) { #construction-site { height: auto; width: 100% } }
@media (orientation: landscape) { #construction-site { height: 100%; width: auto } }
<body padded="0">
<div id="construction-site" band="padded">
    <svg viewbox="0 0 1600 1200"
         xmlns="http://www.w3.org/2000/svg"
         xmlns:xlink="http://www.w3.org/1999/xlink">

        <style>
            .line       { stroke: Black; stroke-opacity: 0; stroke-width: 2px; cursor: pointer } 
            .polyline   { fill  : Red  ; fill-opacity  : 0 }
    
            .floor-text { fill: Black; stroke: none; fill-opacity: 0;
                          cursor: default; pointer-events: none;
                          font-weight: bold; font-family: sans-serif;
                          /* responsive font using y = mx + b */
                          font-size: calc(-1vmin + 51.2px); /* (320,48)(1920,32) */
                        }

            .floor:hover>.line       { fill-opacity: .4; stroke-opacity: .8 }
            .floor:hover>.floor-text { fill-opacity: .7 }
        </style>

        <image href="https://i.imgur.com/0i4N0d3.jpg"/>

        <a id="top-floor" class="floor" rel="noopener" target="_blank" href="javascript:void(0)" title="top floor, click for details...">
            <polyline class="line polyline" 
                points="201.242,678.473 1121.43, 333.16 1370.24,
                        553.473 1387.74, 668.473 1127.49,
                        474.098 189.242, 753.473 202.242, 678.973"/>

            <line class="line" x1="1121.42" y1="333.472" x2="1127.45" y2="474.097"/>
            <text class="floor-text" x="800" y="150" text-anchor="middle">top floor demo text</text>
        </a>
    </svg>
</div>
</body>

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