Openlayers自定義標記

Question

一些信息： 我得到了一個主層（地圖），即時通過線串從JSON結果中獲取點之間的線條。

（問題） 我跟着一個例子在線上如何自定義我加入點。但這不起作用。 （只看底部的功能。）

代碼：

//'listOfPoints' is an array containing all the point objects. 

var pointmap = new OpenLayers.Geometry.LineString(listOfPoints); 

    var lastpoint = listOfPoints[listOfPoints.length -1]; 


    var vesselLayer = new OpenLayers.Layer.Vector(data.bridge_name); 

    if (lastpoint != null) { 
     var markerLayer = getPOI(lastpoint); 
     vesselLayer.addFeatures([pointmap,markerLayer]); 
    } else { 
     vesselLayer.addFeatures([new OpenLayers.Feature.Vector(pointmap)]); 
    } 

// Function for creating a marker and returning it to the caller. 

function getPOI(point) { 

//This was also tried without the "Style" property. (Only the externalGraphic line) 
var temp_feature = new OpenLayers.Feature.Vector(
     point, 
     style: { externalGraphic: '/assets/img/marker.png', graphicHeight: 16,  graphicWidth: 16, graphicXOffset:8, graphicYOffset:8 } 
    );  

return temp_feature; 
} 

Answer 1

乍一看，有錯誤temp_feature定義：

var temp_feature = new OpenLayers.Feature.Vector(
    point, 
    null, 
    { 
     externalGraphic: '/assets/img/marker.png', 
     graphicHeight: 16, 
     graphicWidth: 16, 
     graphicXOffset:8, 
     graphicYOffset:8 
    } 
); 

它閱讀並遵照API文檔是非常有用的： http://dev.openlayers.org/docs/files/OpenLayers/Feature/Vector-js.html#OpenLayers.Feature.Vector.OpenLayers.Feature.Vector

OpenLayers.Feature.Vector有三個參數，幾何形狀，物體的屬性（這是你的情況，正弦空e你沒有任何屬性），並有風格的對象。

我還沒有測試過這個代碼，可能還有其他問題。

而關於一般使用JavaScript，從來就沒有這樣的東西作爲

style: { externalGraphic: '/assets/img/marker.png', graphicHeight: 16,  graphicWidth: 16, graphicXOffset:8, graphicYOffset:8 } 

對象總是括號內定義：

{style: { externalGraphic: '/assets/img/marker.png', graphicHeight: 16,  graphicWidth: 16, graphicXOffset:8, graphicYOffset:8 }}