Vector OpenLayers上只有一个弹出窗口

时间:2013-08-22 18:44:46

标签: openlayers openstreetmap

我使用带矢量图层的OpenLayers来显示地图上的不同项目。

最重要的是,我想为每个项目(一个功能)添加一个弹出窗口(当点击项目时显示弹出窗口)。要做到这一点,我有:

function initMap()
    {
     // In this function I add with success the different items to the vectorLayer.
    }

    function finishMap()
    {

        map.addLayer(vectorLayer);

        selectControl = new OpenLayers.Control.SelectFeature(vectorLayer,
            {
                onSelect: onFeatureSelect,
                onUnselect: onFeatureUnselect
            });
        map.addControl(selectControl);
        selectControl.activate();
    }

    function onFeatureClose(evt) {
        selectControl.unselect(selectedFeature);
    }

    function onFeatureSelect(feature) {
        var popup = new OpenLayers.Popup.FramedCloud("popup",
            feature.geometry.getBounds().getCenterLonLat(),
            null,
            feature.description,
            true,
            onFeatureClose);
        popup.panMapIfOutOfView = true;
        popup.autoSize = true;
        feature.popup = popup;

        map.addPopup(popup);
    }

    function onFeatureUnselect(feature) {
        map.removePopup(feature.popup);
        feature.popup.destroy();
        feature.popup = null;
    }

对不同功能的要求是:

  1. initMap();
  2. finishMap();
  3. 问题是:我只有一个项目(超过10个)点击它弹出一个...

1 个答案:

答案 0 :(得分:1)

通常,将选择处理程序直接实现到图层对象更容易,这是(我猜)在initMap方法中。使用eventListeners属性,如下所示:

    var layer = new OpenLayers.Layer.Vector("Vector layer", { 
        eventListeners: {
            'featureselected':function(evt){
                var feature = evt.feature;
                var popup = new OpenLayers.Popup.FramedCloud("popup",
                    OpenLayers.LonLat.fromString(feature.geometry.toShortString()),
                    null,
                    "<div style='font-size:.8em'>Feature: " + feature.id +"<br>Foo: " + feature.attributes.foo+"</div>",
                    null,
                    true
                );
                feature.popup = popup;
                map.addPopup(popup);
            },
            'featureunselected':function(evt){
                var feature = evt.feature;
                map.removePopup(feature.popup);
                feature.popup.destroy();
                feature.popup = null;
            }
        }
    });

//create selector control
var selector = new OpenLayers.Control.SelectFeature(layer,{
        autoActivate:true
    });

示例实现:http://openlayers.org/dev/examples/light-basic.html,唯一的区别是selecotr对鼠标悬停和mouseout做出反应,而不是单击(通过将选择器的悬停属性设置为true来完成)。

另外,关于SO的一个非常相似的问题:How to add a popup box to a vector in OpenLayers?

有关课程的详细信息,请参阅OL文档:http://dev.openlayers.org/docs/files/OpenLayers-js.html 或者要求离开。

希望至少有一些有帮助。