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如何在Primefaces中更新gmap中的緯度和經度

[英]How to update Latitude and Longitude in gmap in primefaces

 原文  2014-11-17 08:16:00  7   1    google-maps/ jsf/ primefaces/ jsf-2.2/ primefaces-gmap

問題描述

當緯度和經度值更改時，我只想更新地圖上的緯度和經度。 但是現在我已經嘗試使用按鈕來實現這一點，但這也無法正常工作。 我不想更新整個地圖，我只想在地圖更改或新值來自代碼時更新地圖中的經緯度值。 但是目前，即使按鈕代碼也不起作用。

JSF頁面和ManagedBean代碼如下： 

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://xmlns.jcp.org/jsf/html"
      xmlns:p="http://primefaces.org/ui">
    <h:head>
        <title>Facelet Title</title>
        <script src="http://maps.google.com/maps/api/js?sensor=false" 
        type="text/javascript"></script>
    </h:head>
    <h:body>
        Form1 hello
        <h:form id="form1"> 
            <p:inputText id="lat" value="#{mapBean.lat}"> </p:inputText>
            <p:inputText id="lng" value="#{mapBean.lng}"> </p:inputText>
            <p:commandButton update="gmp" value="button" actionListener="#{mapBean.funx}"></p:commandButton>
            <p:gmap id="gmp" center="#{mapBean.geo}" zoom="15" type="TERRAIN" style="width:600px;height:400px" model="#{mapBean.advancedModel}" >

            </p:gmap>
        </h:form>  
    </h:body>
</html>

public class MapBean {

    /**
     * Creates a new instance of MapBean
     */
    private final MapModel advancedModel;
    private String geo;
    private Double lat;
    private Double lng;
    private StringBuilder builder;

    public MapBean() {
        geo = "33.572571, 73.055555";
        advancedModel = new DefaultMapModel();
        //Shared coordinates  33.572571, 73.041444
        //33.576021,73.044491
        lat = 33.576021;
        lng = 73.044491;

        LatLng coord1 = new LatLng(lat, lng);
        //Icons and Data  
        advancedModel.addOverlay(new Marker(coord1, "Rawalpindi", null,   "https://storage.googleapis.com/support-kms-prod/SNP_2752125_en_v0"));
//        for (int i = 0; i < advancedModel.getMarkers().size(); i++) {
//        RequestContext.getCurrentInstance().addCallbackParam("marker" + i,    advancedModel.getMarkers().get(i));
//        }
    }

    public MapModel getAdvancedModel() {
        return advancedModel;
    }

    public String getGeo() {
        return geo;
    }

    public void setGeo(String geo) {
        this.geo = geo;
    }

    public Double getLat() {
        return lat;
    }

    public void setLat(Double lat) {
        this.lat = lat;
    }

    public Double getLng() {
        return lng;
    }

    public void setLng(Double lng) {
        this.lng = lng;
    }

    public void funx(ActionEvent e) {
        System.out.println("ajax funnx");
        builder.append("\"").append(lat).append(",").append(lng).append("\"");
        geo = builder.toString();
        System.out.println("Latitude" + lat + "Longitutde" + lng);
        LatLng coord1 = new LatLng(lat, lng);
        //Icons and Data  
        advancedModel.addOverlay(new Marker(coord1, "Rawalpindi", null, "https://storage.googleapis.com/support-kms-prod/SNP_2752125_en_v0"));
    }
}

錯誤： 

WARNING:   /index.xhtml @16,91 actionListener="#{mapBean.funx}": java.lang.NullPointerException
javax.el.ELException: /index.xhtml @16,91 actionListener="#{mapBean.funx}": java.lang.NullPointerException
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:111)
    at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:147)
    at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
    at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:818)
    at javax.faces.component.UICommand.broadcast(UICommand.java:300)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:646)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
    at MapBean.MapBean.funx(MapBean.java:78)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:275)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    ... 37 more

1 個解決方案

解決方案1
 0  2014-11-17 14:06:51

對於所關注你目前的問題，您需要實例建設者在構造函數 

public MapBean() {
        geo = "33.572571, 73.055555";
        builder = new StringBuilder();
        ...
}

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