開放層標簽不起作用

Question

我一直在嘗試使openlayers標簽功能正常工作並產生以下示例：

<html>
<head>
  <title>OpenLayers Example</title>
<script src="http://openlayers.org/api/OpenLayers.js"></script>
</head>
<body>
  <div style="width:100%; height:100%" id="map"></div>
  <script>
    var map = new OpenLayers.Map('map');
    var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
        "http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
    map.addLayer(wms);
    // Default polygon style
    var polygonStyle = 
    OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default']);
    polygonStyle.strokeColor = "#800000";
    polygonStyle.fillColor = "#800080";
    polygonStyle.fillOpacity = 0.2;
    polygonStyle.strokeWidth = 1;
    polygonStyle.label = "Label:${label}";
    polygonStyle.labelOutlineColor = "white";
    polygonStyle.labelOutlineWidth = 3;

    var smap = new OpenLayers.StyleMap({"default": polygonStyle});
    var veclayer = new OpenLayers.Layer.Vector("Survey Locations", {"styleMap": smap});
    map.addLayer(veclayer);

    var data = {"type":"Polygon","coordinates":[[
    [-2.07362131225228,52.0329916851734],
    [-2.07096056091493,52.0228522264397],
    [-2.05061868774548,52.0156687188299],
    [-2.04280809509186,52.0210036398637],
    [-2.02804521667506,52.0231163039992],
    [-2.01748804200037,52.0300345805213],
    [-2.01645807373352,52.0464545997404],
    [-2.02589944946666,52.0529998067114],
    [-2.04194978821027,52.0554276235705],
    [-2.06023172485491,52.0455044093648],
    [-2.07362131225228,52.0329916851734]]]};
    var gson = new OpenLayers.Format.GeoJSON();
    var GEO = gson.read(data, "Geometry");
    var EPSG4326 = new OpenLayers.Projection("EPSG:4326");
    GEO = GEO.transform(EPSG4326, map.getProjectionObject());
    var locname="First label";
    var FEA = new OpenLayers.Feature.Vector(GEO, {"label":locname}, polygonStyle);
    veclayer.addFeatures([FEA]);
    map.zoomToExtent(GEO.getBounds(),false);
    data= {"type":"Polygon","coordinates":[[[-2.04514962074064,52.0403793945411],
    [-2.03057040393828,52.0403841112724],
    [-2.03057659173109,52.0493747022699],
    [-2.04515873420745,52.049369984023],
    [-2.04514962074064,52.0403793945411]]]}

    var GEO = gson.read(data, "Geometry");
    var EPSG4326 = new OpenLayers.Projection("EPSG:4326");
    GEO = GEO.transform(EPSG4326, map.getProjectionObject());
    var locname="Second label";
    var FEA = new OpenLayers.Feature.Vector(GEO, {"label":locname}, polygonStyle);
    veclayer.addFeatures([FEA]);

  </script>
</body>
</html>

代碼可以工作，但是多邊形上的標簽顯示為Label：$ {Label}，而不是將變量解釋為讀取Label：First label等。

將其集成到較大的應用程序中時，第一個標簽不能正確解釋，而第二個標簽可以正確解釋。 我懷疑這可能是一個層初始化問題，但不知道如何解決。

任何幫助，將不勝感激！！

Answer 1

您是否在聲明功能后嘗試將屬性添加為對象，例如：

FEA.attributes = {label：locname}

它以這種方式工作，請參見以下更改：

<html>
<head>
  <title>OpenLayers Example</title>
<script src="http://openlayers.org/api/OpenLayers.js"></script>
</head>
<body>
  <div style="width:100%; height:100%" id="map"></div>
  <script>
    var map = new OpenLayers.Map('map');
    var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
        "http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
    map.addLayer(wms);
    // Default polygon style
    var polygonStyle = 
    OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default']);
    polygonStyle.strokeColor = "#800000";
    polygonStyle.fillColor = "#800080";
    polygonStyle.fillOpacity = 0.2;
    polygonStyle.strokeWidth = 1;
    polygonStyle.label = "Label:${label}";
    polygonStyle.labelOutlineColor = "white";
    polygonStyle.labelOutlineWidth = 3;

    var smap = new OpenLayers.StyleMap({"default": polygonStyle});
    var veclayer = new OpenLayers.Layer.Vector("Survey Locations", {"styleMap": smap});
    map.addLayer(veclayer);

    var data = {"type":"Polygon","coordinates":[[
    [-2.07362131225228,52.0329916851734],
    [-2.07096056091493,52.0228522264397],
    [-2.05061868774548,52.0156687188299],
    [-2.04280809509186,52.0210036398637],
    [-2.02804521667506,52.0231163039992],
    [-2.01748804200037,52.0300345805213],
    [-2.01645807373352,52.0464545997404],
    [-2.02589944946666,52.0529998067114],
    [-2.04194978821027,52.0554276235705],
    [-2.06023172485491,52.0455044093648],
    [-2.07362131225228,52.0329916851734]]]};
    var gson = new OpenLayers.Format.GeoJSON();
    var GEO = gson.read(data, "Geometry");
    var EPSG4326 = new OpenLayers.Projection("EPSG:4326");
    GEO = GEO.transform(EPSG4326, map.getProjectionObject());
    var locname="First label";
    var FEA = new OpenLayers.Feature.Vector(GEO);
    FEA.attributes = {
    label:locname
    }
    veclayer.addFeatures([FEA]);
    map.zoomToExtent(GEO.getBounds(),false);
    data= {"type":"Polygon","coordinates":[[[-2.04514962074064,52.0403793945411],
    [-2.03057040393828,52.0403841112724],
    [-2.03057659173109,52.0493747022699],
    [-2.04515873420745,52.049369984023],
    [-2.04514962074064,52.0403793945411]]]}

    var GEO = gson.read(data, "Geometry");
    var EPSG4326 = new OpenLayers.Projection("EPSG:4326");
    GEO = GEO.transform(EPSG4326, map.getProjectionObject());
    var locname="Second label";
    var FEA = new OpenLayers.Feature.Vector(GEO);
    FEA.attributes = {
        label: locname
    }
    veclayer.addFeatures([FEA]);

  </script>
</body>
</html>

開放層標簽不起作用

問題描述

1 個解決方案

解決方案1
1 已采納 2014-03-26 17:00:55

開放層標簽不起作用

問題描述

1 個解決方案

解決方案1 1 已采納 2014-03-26 17:00:55

解決方案1
1 已采納 2014-03-26 17:00:55