如何在Primefaces中更新gmap中的纬度和经度

Question

I want to update only latitude and longitude on map when lat and long value changes. 当纬度和经度值更改时，我只想更新地图上的纬度和经度。 But for now I have tried to achieve this using button but this is not working also. 但是现在我已经尝试使用按钮来实现这一点，但这也无法正常工作。 I don't want to update whole map, I only want to update lat long value in map whenever it changes or new value comes from code. 我不想更新整个地图，我只想在地图更改或新值来自代码时更新地图中的经纬度值。 But for now even button code is not working. 但是目前，即使按钮代码也不起作用。

JSF page and ManagedBean code is given as follows: JSF页面和ManagedBean代码如下：

<?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"));
    }
}

Error: 错误：

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

Answer 1

For what concerns you current problem, you need to instantiate the builder in your constructor 对于所关注你目前的问题，您需要实例建设者在构造函数

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

如何在Primefaces中更新gmap中的纬度和经度

问题描述

1 个解决方案

解决方案1
0 2014-11-17 14:06:51

如何在Primefaces中更新gmap中的纬度和经度

问题描述

1 个解决方案

解决方案1 0 2014-11-17 14:06:51

解决方案1
0 2014-11-17 14:06:51