HTML热区map坐标，随窗口大小自适应办法（javascript）

为图片添加MAP：

<div>
<span id="lbresult">
<img src='YardCribGraphic.aspx' width='100%' heigh='100%' usemap='#b0a1a239cbf34d64acf4d6798dd67da0' border='0'/>
<map id="CribMap" name="b0a1a239cbf34d64acf4d6798dd67da0">
   <area shape="poly" id="41" coords="244,90,244,210,322,210,295,150,322,90" href="#" title="垛位名：南2垛位"
/>
   <area shape="poly" id="43" coords="350,90,350,210,433,210,461,150,405,90" href="#" title="垛位名：垛位3"
/>
   <area shape="poly" id="42" coords="241,240,241,360,309,360,322,300,295,240" href="#" title="垛位名：北垛位2"
 />
   <area shape="poly" id="44" coords="240,390,240,510,364,510,350,450,336,390" href="#" title="垛位名：三堆场001"
 />
</map></span>
</div>

 

图片大小随页面变化，需要MAP中每个area的坐标也随页面等比例变化。

JavaScript实现：

 

<script type="text/javascript">

        adjust();

        var timeout = null;//onresize触发次数过多，设置定时器
        window.onresize = function () {
            clearTimeout(timeout);
            timeout = setTimeout(function () { window.location.reload(); }, 100);//页面大小变化，重新加载页面以刷新MAP
        }

        //获取MAP中元素属性
        function adjust() {
            var map = document.getElementById("CribMap");
            var element = map.childNodes;
            var itemNumber = element.length / 2;
            for (var i = 0; i < itemNumber - 1; i++) {
                var item = 2 * i + 1;
                var oldCoords = element[item].coords;
                var newcoords = adjustPosition(oldCoords);
                element[item].setAttribute("coords", newcoords);
            }
            var test = element;
        }

        //调整MAP中坐标
        function adjustPosition(position) {
            var pageWidth = document.body.clientWidth;//获取页面宽度
            var pageHeith = document.body.clientHeight;//获取页面高度

            var imageWidth = 1160;<span style="white-space:pre">    </span>//图片的长宽
            var imageHeigth = 990;

            var each = position.split(",");
            //获取每个坐标点
            for (var i = 0; i < each.length; i++) {
                each[i] = Math.round(parseInt(each[i]) * pageWidth / imageWidth).toString();//x坐标
                i++;
                each[i] = Math.round(parseInt(each[i]) * pageHeith / imageHeigth).toString();//y坐标
            }
            //生成新的坐标点
            var newPosition = "";
            for (var i = 0; i < each.length; i++) {
                newPosition += each[i];
                if (i < each.length - 1) {
                    newPosition += ",";
                }
            }
            return newPosition;
        }
</script>