如何使用JavaScript中的DOM操作函数将<map> -Element添加到文档?</map>

时间:2012-04-13 20:26:19

标签: javascript html dom map

我尝试使用以下代码将HTML添加到HTML-Document并将其链接到图像:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="de">
<head>
    <title>Website</title>
    <script type="text/javascript">
    function addArea(map, xstart, ystart, xende, yende, idCol, col) {
        area = document.createElement("area");

        area.shape  = "rect";
        area.coords = "" + xstart + ", " + ystart + ", " + xende + ", " + yende + "";
        area.href   = "#" + idCol;
        area.title  = col;
        area.alt    = col;
/*
        area.shape  = "\"rect\"";
        area.coords = "xstart + \", \" + ystart + \", \" + xende + \", \" + yende";
        area.href   = "\"#\" + idCol";
        area.title  = "col";
        area.alt    = "col";

*/      area.setAttribute(
            "onclick",
            "alert(\"Color: \" + col); return false;"
        );

        // append the area to the map
        map.appendChild(area);
    }

    function showMap() {
        idCol = "text";

        // generate the map
        mapCol      = document.createElement("map");
        mapCol.name = "map_" + idCol;
        mapCol.id   = "map_" + idCol;
        addArea(mapCol, 1, 1, 25, 13, idCol, "00FF00");
        addArea(mapCol, 25, 1, 49, 13, idCol, "00FF33");


        imgCol              = document.createElement("img");
        imgCol.src          = "https://www.google.de/images/srpr/logo3w.png";
        imgCol.width        = 275;
        imgCol.height       = 95;
        imgCol.style.border = "1px solid #000";
        imgCol.usemap       = "#name_und_raute_sind_notwendig_bunt_" + idCol;
        imgCol.alt          = "Farbe auswählen";

        imgColArea      = document.createElement("p");
        imgColArea.appendChild(imgCol);

        testcol = "ffffff";
        testlink    = document.createElement("a");
        testlink.appendChild(document.createTextNode("testlink"));
        testlink.setAttribute(
            "onclick",
            "alert(\"Color: \" + testcol); return false;"
        );

        document.getElementById("area").appendChild(imgColArea);
        document.getElementById("area").appendChild(testlink);

        alert("map added with " + mapCol.areas.length + " entries.");

    }


    </script>
</head>
<body onLoad="showMap()">
<div>
before
<div id="area"></div>
after
</div>
</body>

图像应包含链接区域,在单击时会提醒文本。不合理地区域不会出现。有没有人发现我的错误?

2 个答案:

答案 0 :(得分:3)

首先,您的地图标识符不匹配。此外,属性名称为useMap,而非usemap。使用

imgCol.setAttribute('usemap',"#" + mapCol.name);

imgCol.useMap = "#" + mapCol.name;

代替。您还必须将地图添加到文档中:

/* ... */
imgColArea.appendChild(imgCol);
imgColArea.appendChild(mapCol);
/* ... */

JSFiddle demonstration

答案 1 :(得分:0)

我不确定这一点,但我认为你应该在将MAP - 元素添加到文档之前将其附加到文档中。创建新元素不同于创建属性到非附加元素。