一些组件空白

Question

我创建了一个本地网站来导入一串GPS坐标。 布局是基本的，但主要由primefaces组件组成：

• 号码：布局
• 号码：layoutUnit
• 号码：selectOneList
• 号码：GMAP
• 号码：应用于LineChart

经过一些编码后，我注意到gMap和lineChart不再工作了。起初我认为这是与它相关的空对象的原因（gMap的defaultMapModel和lineChart的CartesianChartModel）。即使创建新对象并将示例数据与其关联，这些组件也会保持空白。

即使删除gMap中的模型属性似乎也不起作用。

以下是我认为重要的代码： 的的index.xhtml：

<p:layoutUnit position="west" size="255" header="Options" resizable="false" closable="false" collapsible="true">  
    <div class="row-fluid">
        <h4><i class="icon-calendar icon-white"></i>Calendar</h4>
        <p:calendar mode="inline" id="inlineCal"/>
    </div>
    <div class="row-fluid">
        <h4><i class="icon-random icon-white"></i>Tracks</h4>
        <h:form prependId="false">
            <p:selectOneListbox id="basic" style="width: 97%;" value="#{geoTrackController.geoTrack}">  
                <f:selectItems value="#{geoTrackController.allGeoTracks}" itemLabel="#{geoTrackController.geoTrack.id}"  itemValue="#{geoTrackController.geoTrack.id}" />
            </p:selectOneListbox>
        </h:form>
    </div>
</p:layoutUnit>

<p:layoutUnit position="center">
    <p:layout fullPage="false">

        <p:layoutUnit position="south" size="200" header="Speed (km/h)" resizable="false" closable="false" collapsible="true">  
            <p:lineChart id="linear" value="#{geoTrackController.linearModel}" legendPosition="e" zoom="true" minY="0" maxY="130" style="height:140px" widgetVar="chart" />
        </p:layoutUnit>  

        <p:layoutUnit position="center">
            <p:gmap id="geomap" center="50.52, 4.22" zoom="7" type="HYBRID" style="width:100%;height:97%;" model="#{geoTrackController.mapModel}" streetView="true" /> 
        </p:layoutUnit>  

    </p:layout>
</p:layoutUnit>

控制器

@Named
@SessionScoped
public class GeoTrackController implements Serializable {

    @EJB
    private GeoTrackBean tbean;
    private GeoTrack geoTrack = new GeoTrack();
    private CartesianChartModel linearModel;
    private MapModel map;
    ;
    private String center = "50.8333, 4";
    private String gpsDump;

    @PostConstruct
    public void init() {
        createMapModel();
        createLinearModel();
    }

    public GeoTrackController() {

    }

    public GeoTrack getGeoTrack() {
        return geoTrack;
    }

    public void setGeoTrack(GeoTrack geoTrack) {
        this.geoTrack = geoTrack;
    }

    public void trackChangeEvent(ValueChangeEvent e) {
        createMapModel();
        createLinearModel();
    }

    public List<GeoTrack> getAllGeoTracks() {
        return tbean.getAllGeoTracks();
    }

    public String getGpsDump() {
        return gpsDump;
    }

    public void setGpsDump(String gpsDump) {
        this.gpsDump = gpsDump;
    }

    public String getCenter() {
        return center;
    }

    public void submit() {
        tbean.addOrUpdateGeoTrack(geoTrack);
        createMapModel();
        createLinearModel();
    }

    public MapModel getMapModel() {
        return map;
    }

    public void onPolylineSelect(OverlaySelectEvent event) {
        addMessage(new FacesMessage(FacesMessage.SEVERITY_INFO, "Polyline Selected", null));
    }

    public void addMessage(FacesMessage message) {
        FacesContext.getCurrentInstance().addMessage(null, message);
    }

    public CartesianChartModel getLinearModel() {
        return linearModel;
    }

    private void createMapModel() {
        map = new DefaultMapModel();

        if (this.geoTrack != null) {
            Polyline path = new Polyline();
            LatLng temp = new LatLng(0.00, 0.00);
            for (GeoCoordinate c : this.geoTrack.getCoordinates()) {
                LatLng coord = new LatLng(c.getLatitude(), c.getLongitude());
                if (!temp.equals(coord)) {
                    path.getPaths().add(coord);
                }
            }

            path.setStrokeWeight(4);
            path.setStrokeColor("#FF9900");
            path.setStrokeOpacity(0.7);

            map.addOverlay(path);
        }
    }

    private void createLinearModel() {
        linearModel = new CartesianChartModel();

        LineChartSeries speedChart = new LineChartSeries();
        speedChart.setLabel("Speed");
        if (this.geoTrack != null) {
            for (GeoCoordinate c : this.geoTrack.getCoordinates()) {
                speedChart.set(c.getDateTime().toString(), c.getSpeed());
            }
            linearModel.addSeries(speedChart);
        } else {
            speedChart.set(new Date(), 0);
        }
    }
}