如何将Hovering应用于html区域标签？
我正在尝试hoverHTML的区域标记。 我在CSS中试过这个：
area:hover { border:1px solid black; } 这是应该应用的HTML。
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coords="572,1222,572,1265,459,1265,458,1289,339,1290,344,1225" href="" alt="imgmap201293016112-41" title="imgmap201293016112-41" class="imgmap201293016112-area" id="imgmap201293016112-area-41" /> </map>
那么当我徘徊的时候，边界的颜色会变成黑色甚至是红色呢？
我所做的就是创build一个canvas元素，然后将其放置在图像映射之前。 然后，每当一个区域被挖空时，我会调用一个函数来获取该形状的坐标string和形状types。 如果是多边形，我使用坐标在canvas上绘制轮廓。 如果这是一个矩形，我画一个矩形轮廓。 您可以轻松添加代码来处理圈子。
在填充poly / rect /圆之前，您还可以将canvas的不透明度设置为小于100％。 你也可以改变对canvas上下文的全局依赖 – 这意味着你可以在同一页面上处理多于一个的图像地图。
<!DOCTYPE html> <html> <head> <script> // stores the device context of the canvas we use to draw the outlines // initialized in myInit, used in myHover and myLeave var hdc; // shorthand func function byId(e){return document.getElementById(e);} // takes a string that contains coords eg - "227,307,261,309, 339,354, 328,371, 240,331" // draws a line from each co-ord pair to the next - assumes starting point needs to be repeated as ending point. function drawPoly(coOrdStr) { var mCoords = coOrdStr.split(','); var i, n; n = mCoords.length; hdc.beginPath(); hdc.moveTo(mCoords[0], mCoords[1]); for (i=2; i<n; i+=2) { hdc.lineTo(mCoords[i], mCoords[i+1]); } hdc.lineTo(mCoords[0], mCoords[1]); hdc.stroke(); } function drawRect(coOrdStr) { var mCoords = coOrdStr.split(','); var top, left, bot, right; left = mCoords[0]; top = mCoords[1]; right = mCoords[2]; bot = mCoords[3]; hdc.strokeRect(left,top,right-left,bot-top); } function myHover(element) { var hoveredElement = element; var coordStr = element.getAttribute('coords'); var areaType = element.getAttribute('shape'); switch (areaType) { case 'polygon': case 'poly': drawPoly(coordStr); break; case 'rect': drawRect(coordStr); } } function myLeave() { var canvas = byId('myCanvas'); hdc.clearRect(0, 0, canvas.width, canvas.height); } function myInit() { // get the target image var img = byId('img-imgmap201293016112'); var x,y, w,h; // get it's position and width+height x = img.offsetLeft; y = img.offsetTop; w = img.clientWidth; h = img.clientHeight; // move the canvas, so it's contained by the same parent as the image var imgParent = img.parentNode; var can = byId('myCanvas'); imgParent.appendChild(can); // place the canvas in front of the image can.style.zIndex = 1; // position it over the image can.style.left = x+'px'; can.style.top = y+'px'; // make same size as the image can.setAttribute('width', w+'px'); can.setAttribute('height', h+'px'); // get it's context hdc = can.getContext('2d'); // set the 'default' values for the colour/width of fill/stroke operations hdc.fillStyle = 'red'; hdc.strokeStyle = 'red'; hdc.lineWidth = 2; } </script> <style> body { background-color: gray; } canvas { pointer-events: none; /* make the canvas transparent to the mouse - needed since canvas is position infront of image */ position: absolute; } </style> <title></title> </head> <body onload='myInit()'> <canvas id='myCanvas'></canvas> <!-- gets re-positioned in myInit(); --> <center> <img src='http://dailyaeen.com.pk/epaper/wp-content/uploads/2012/09/27+Sep+2012-1.jpg?1349003469874' usemap='#imgmap_css_container_imgmap201293016112' class='imgmap_css_container' title='imgmap201293016112' alt='imgmap201293016112' id='img-imgmap201293016112' /> <map id='imgmap201293016112' name='imgmap_css_container_imgmap201293016112'> <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="2,0,604,-3,611,-3,611,166,346,165,345,130,-2,130,-2,124,1,128,1,126" href="" alt="imgmap201293016112-0" title="imgmap201293016112-0" class="imgmap201293016112-area" id="imgmap201293016112-area-0" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,131,341,213" href="" alt="imgmap201293016112-1" title="imgmap201293016112-1" class="imgmap201293016112-area" id="imgmap201293016112-area-1" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="346,166,614,241" href="" alt="imgmap201293016112-2" title="imgmap201293016112-2" class="imgmap201293016112-area" id="imgmap201293016112-area-2" /> <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="917,242,344,239,345,496,574,495,575,435,917,433" href="" alt="imgmap201293016112-3" title="imgmap201293016112-3" class="imgmap201293016112-area" id="imgmap201293016112-area-3" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,416,341,494" href="" alt="imgmap201293016112-4" title="imgmap201293016112-4" class="imgmap201293016112-area" id="imgmap201293016112-area-4" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,215,341,410" href="" alt="imgmap201293016112-5" title="imgmap201293016112-5" class="imgmap201293016112-area" id="imgmap201293016112-area-5" /> <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="916,533,916,436,578,436,576,495,806,496,807,535" href="" alt="imgmap201293016112-6" title="imgmap201293016112-6" class="imgmap201293016112-area" id="imgmap201293016112-area-6" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="805,536,918,614" href="" alt="imgmap201293016112-7" title="imgmap201293016112-7" class="imgmap201293016112-area" id="imgmap201293016112-area-7" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="461,494,803,616" href="" alt="imgmap201293016112-8" title="imgmap201293016112-8" class="imgmap201293016112-area" id="imgmap201293016112-area-8" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="0,497,223,616" href="" alt="imgmap201293016112-9" title="imgmap201293016112-9" class="imgmap201293016112-area" id="imgmap201293016112-area-9" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="230,494,456,614" href="" alt="imgmap201293016112-10" title="imgmap201293016112-10" class="imgmap201293016112-area" id="imgmap201293016112-area-10" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="345,935,572,1082" href="" alt="imgmap201293016112-11" title="imgmap201293016112-11" class="imgmap201293016112-area" id="imgmap201293016112-area-11" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="1,617,457,760" href="" alt="imgmap201293016112-12" title="imgmap201293016112-12" class="imgmap201293016112-area" id="imgmap201293016112-area-12" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="345,760,577,847" href="" 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coords="230,1365,455,1430" href="" alt="imgmap201293016112-26" title="imgmap201293016112-26" class="imgmap201293016112-area" id="imgmap201293016112-area-26" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="231,1291,457,1360" href="" alt="imgmap201293016112-27" title="imgmap201293016112-27" class="imgmap201293016112-area" id="imgmap201293016112-area-27" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="230,1210,342,1289" href="" alt="imgmap201293016112-28" title="imgmap201293016112-28" class="imgmap201293016112-area" id="imgmap201293016112-area-28" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="692,928,916,1016" href="" alt="imgmap201293016112-29" title="imgmap201293016112-29" class="imgmap201293016112-area" id="imgmap201293016112-area-29" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="460,616,916,759" href="" alt="imgmap201293016112-30" 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id="imgmap201293016112-area-34" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="577,1036,687,1101" href="" alt="imgmap201293016112-35" title="imgmap201293016112-35" class="imgmap201293016112-area" id="imgmap201293016112-area-35" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="576,1104,689,1172" href="" alt="imgmap201293016112-36" title="imgmap201293016112-36" class="imgmap201293016112-area" id="imgmap201293016112-area-36" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="691,1232,918,1313" href="" alt="imgmap201293016112-37" title="imgmap201293016112-37" class="imgmap201293016112-area" id="imgmap201293016112-area-37" /> <area shape="rect" onmouseover='myHover(this);' onmouseout='myLeave();' coords="341,1085,573,1151" href="" alt="imgmap201293016112-38" title="imgmap201293016112-38" class="imgmap201293016112-area" id="imgmap201293016112-area-38" /> <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="917,868,917,925,688,927,688,955,576,955,574,867,572,864" href="" alt="imgmap201293016112-39" title="imgmap201293016112-39" class="imgmap201293016112-area" id="imgmap201293016112-area-39" /> <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="919,1173,917,1231,688,1231,688,1266,574,1267,576,1175,576,1175" href="" alt="imgmap201293016112-40" title="imgmap201293016112-40" class="imgmap201293016112-area" id="imgmap201293016112-area-40" /> <area shape="poly" onmouseover='myHover(this);' onmouseout='myLeave();' coords="572,1222,572,1265,459,1265,458,1289,339,1290,344,1225" href="" alt="imgmap201293016112-41" title="imgmap201293016112-41" class="imgmap201293016112-area" id="imgmap201293016112-area-41" /> </map> </center> </body> </html>
你可以使用jQuery来实现这一点
例：
$(function () { $('.map').maphilight(); });
通过这个链接了解更多。
如果上面的一个不起作用，然后通过这个链接 。
编辑 ：
给每个area标签，如class="mapping"
并尝试下面的代码
$('.mapping').mouseover(function() { alert($(this).attr('id')); }).mouseout(function(){ alert('Mouseout....'); });
为了完成这个脚本，绘制圆的function，
function drawCircle(coordon) { var coord = coordon.split(','); var c = document.getElementById("myCanvas"); var hdc = c.getContext("2d"); hdc.beginPath(); hdc.arc(coord[0], coord[1], coord[2], 0, 2 * Math.PI); hdc.stroke(); }
