JSFiddle - React, Tailwind, and code Playground

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<div id="map">
    <img class="map" src="images/us_map.jpg" width="960" height="593" usemap="#usa">
    <map name="usa">
<area href="#" title="SC" shape="poly" coords="735,418, 734,419, 731,418, 731,416, 729,413, 727,411, 725,410, 723,405, 720,399, 716,398, 714,396, 713,393, 711,391, 709,390, 707,387, 704,385, 699,383, 699,382, 697,379, 696,378, 693,373, 690,373, 686,371, 684,369, 684,368, 685,366, 687,365, 687,363, 693,360, 701,356, 708,355, 724,355, 727,356, 728,360, 732,359, 745,358, 747,358, 760,366, 769,374, 764,379, 762,385, 761,391, 759,392, 758,394, 756,395, 754,398, 751,401, 749,404, 748,405, 744,408, 741,409, 742,412, 737,417, 735,418">
<area href="#" title="HI" shape="poly" coords="225,521, 227,518, 229,517, 229,518, 227,521, 225,521">
<area href="#" title="HI" shape="poly" coords="235,518, 241,520, 243,520, 244,516, 244,513, 240,512, 236,514, 235,518">
</map>
</div>

CSS

area { border: solid 1px #ddd; }

JavaScript

$("area").each(function() {
    var pairs = $(this).attr("coords").split(', ');
    for(var i=0; i<pairs.length; i++) {
        var nums = pairs[i].split(',');
        for(var j=0; j<nums.length; j++) {
            //console.log(nums[j]);
            //console.log(parseFloat(nums[j]) /2);
            nums[j] = parseFloat(nums[j]) /2;
        }
        pairs[i] = nums.join(',');
    }
    $(this).attr("coords", pairs.join(', '));
});
alert(document.body.innerHTML);