Version 8.3.2
 —  Layout Elements  —

GOOGLEMAP2

The GOOGLEMAP2 control is used to provide for Google Maps support within Application Designer pages. The control internally makes use of the Google Maps API. In order to use the control on your site, you need to sign up for a Google Maps API key at https://developers.google.com/maps/signup. Make sure that you agree with the Google Maps APIs Terms of Service (https://developers.google.com/maps/terms).

The following topics are covered below:


Before You Start

In order to use the GOOGLEMAP2 control, you need to sign up for a Google Maps API key. A key is valid for a single "directory" on your web server only, i.e. you sign up for a URL like http://www.mysite.com/mywebapp/myproject. With a standard installation of Application Designer on localhost, you may sign up for the URL http://localhost:8080/mywebapp/myproject. Typically, you develop your Application Designer web application not on the site on which you run it later in productive mode. Therefore, you may sign up for two different sites (development and production site).

Required Steps

  1. Choose the project directory that keeps the layouts using the GOOGLEMAP2 control.

  2. Sign up for a Google Maps API key at https://developers.google.com/maps/signup for this project directory (e.g. http://localhost:8080/mywebapp/myproject).

  3. Create the API key page. Store the key page in the registered project directory. You are free in naming the file (the file extension must be "html"). The GOOGLEMAP2 control embeds your API key as a subpage. The subpage must have the following minimum structure:

    <html>
      <head>
        <script src=" http://maps.google.com/maps?file=api&amp;v=2.x&amp;key=YOUR_API_KEY"></script>
       	<script src="../HTMLBasedGUI/general/googlemapsscript.js"></script>
      </head>
      <body>
        <div id="map" style="position:absolute; top0; left:0;"></div>
      </body>
    </html>

    You see that the page includes two JavaScript libraries. The first line refers to the Google Maps API. Replace the placeholder "YOUR_API_KEY" with your Google Maps API key. With the second line, the page includes the control's scripting (calls from Application Designer to the Google Maps). The page body is quite simple: it contains a single div tag with the ID "map". This div is used as an anchor to insert Google Maps controls dynamically.

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Example

The following topics are covered below:

General Usage

The map options are taken from the property infoprop. On this object, you may set the address (or latitude and longitude), the zoom level and the map size as well as the map type.

Note:
The usage of address or longitude/latitude is mutually exclusive.

Google Map

The above map is controlled by the following adapter code:

public class GoogleMap2Adapter extends Adapter
{
  // property >gm2Info<
  GOOGLEMAP2Info m_gm2Info = new GOOGLEMAP2Info(
                               GOOGLEMAP2Info.NO_MAPTYPE_CONTROL,
                               GOOGLEMAP2Info.SMALL_MAP);
  public GOOGLEMAP2Info getGm2Info(){ return m_gm2Info; }
  public void setGm2Info(GOOGLEMAP2Info value){ m_gm2Info = value; }
  // Marker items
  private class HotelMarker extends GOOGLEMAP2Item
  {
    // [see section "Marker Management"]
    ....
  }

  private Hashtable hotels = new Hashtable();

  /** initialisation - called when creating this instance */
  public void init()
  {
    m_gm2Info.setAddress("Darmstadt, Germany");
    m_gm2Info.setZoomlevel("13");
    setupHotels();
  }

  // property >hotelSelection<
  String m_hotelSelection = "";
  public String getHotelSelection(){ return m_hotelSelection; }
  public void setHotelSelection(String value){ m_hotelSelection = value; }

  // property >validHotSel<
  COMBODYNValidValues m_validHotSel = new COMBODYNValidValues();
  public COMBODYNValidValues getValidHotSel(){ return m_validHotSel; }

  /** */
  public void onSelect()
  {
    HotelMarker hotel = (HotelMarker) hotels.get(m_hotelSelection);
    m_gm2Info.centerMarker(hotel);
  }

  // property >hotelDesc<
  String m_hotelDesc = "";
  public String getHotelDesc(){ return m_hotelDesc; }
  public void setHotelDesc(String value){ m_hotelDesc = value; }

  // property >hotelName<
  String m_hotelName = "";
  public String getHotelName(){ return m_hotelName; }
  public void setHotelName(String value) { m_hotelName = value; }

  /** */
  public void onPlaceOwn()
  {
    if (m_hotelName.equals(""))
    {
      outputMessage(MT_ERROR, "Please specify a name.");
      return;
    }

    HotelMarker MyHotel = new HotelMarker(m_hotelName);
    MyHotel.setInfoText("<b>" + m_hotelName + "</b>\n" + m_hotelDesc);

    m_gm2Info.addMarkerToLastSelectedPoint(MyHotel);
  }

  /** */
  public void onRemove()
  {
    m_gm2Info.removeLastSelectedMarker();
  }

  /** */
  public void onRemoveAll()
  {
    m_gm2Info.clear();
    hotels.clear();
    m_validHotSel.clear();
    m_hotelSelection = "";
  }

  /** */
  public void onShowAll()
  {
    onRemoveAll();
    setupHotels();
  }

  private void setupHotels()
  {
    setupHotel("Bestwestern, Parkhaus-Hotel",
        "Grafenstraße 31, 64283 Darmstadt");
    setupHotel(" ....
    // deactivate last added marker
    m_gm2Info.setSelectedMarker(null);
  }

  private void setupHotel(String name, String address)
  {
    HotelMarker hotel = new HotelMarker(name, address);
    hotel.setInfoText("<b>" + name + "</b>\n" + address.replaceAll(", ", "\n"));
    m_gm2Info.addMarker(hotel, false);
    if (name.length() > 23)
      name = name.substring(0, 23) + "...";
    m_validHotSel.addValidValue(String.valueOf(hotel.getId()), name);
    hotels.put(String.valueOf(String.valueOf(hotel.getId())), hotel);
  }

  // property >naviCity<
  String m_naviCity;
  public String getNaviCity(){ return m_naviCity; }
  public void setNaviCity(String value){ m_naviCity = value; }

  // property >naviCountry<
  String m_naviCountry;
  public String getNaviCountry(){ return m_naviCountry; }
  public void setNaviCountry(String value){ m_naviCountry = value; }

  // property >naviStreet<
  String m_naviStreet;
  public String getNaviStreet(){ return m_naviStreet; }
  public void setNaviStreet(String value){ m_naviStreet = value; }

  /** */
  public void onNavigate()
  {
    String address = "";

    if (!m_naviStreet.equals(""))
    {
      address += m_naviStreet + ", ";
    }
    if (!m_naviCity.equals(""))
    {
      address += m_naviCity + ", ";
    }
    if (!m_naviCountry.equals(""))
    {
      address += m_naviCountry;
    }

    m_gm2Info.setAddress(address);
  }

  ....
}

The above map is initialized with the instantiation of the GOOGLEMAP2Info object and just a few simple lines of code in the init() method.

The constructor of the GOOGLEMAP2Info class takes the following arguments:

The GOOGLEMAP2Info class provides for a second constructor without any arguments. Using this constructor is equal to the usage of the described constructor with the constants "NO_MAPTYPE_CONTROL" and "SMALL_MAP".

In the init() method, the map view is positioned via the setAddress method. The same result would be achieved using the setLatLng method with the argument "49,879046" (for latitude) and "8,670112" (for longitude). It is obligatory to set the map view using one of these variants or using a marker (see Marker Management for further information). Otherwise the map will not be displayed.

The range of values for the zoomlevel property may vary according to the map region. The value "4" is used by default if zoomlevel is not set explicitly.

The GOOGLEMAP2 control listens to changes on the address (or latitude/longitude) and the zoomlevel property.

Marker Management

To use the marker management of the GOOGLEMAP2 control, you need an implementation of the GOOGLEMAP2Item class. For the above example, the following code was used:

private class HotelMarker extends GOOGLEMAP2Item
{
  private String m_name;

  public HotelMarker(String name)
  {
    super(true);
    m_name = name;
  }

  public HotelMarker(String name, String address)
  {
    super(address, true);
    m_name = name;
  }

  public void reactOnSelect()
  {
    outputMessage(MT_SUCCESS, "Hotel '" + m_name + "' selected.");
  }

  public void reactOnDrag()
  {
    outputMessage(MT_SUCCESS, "Hotel '" + m_name + "' has moved.");
  }

  public void reactOnDeactivate()
  {
    outputMessage(MT_SUCCESS, "Hotel '" + m_name + "' deselected.");
  }
}

The methods reactOnSelect(), reactOnDrag() and reactOnDeactivate() have to be implemented in order to define the behavior for the following events:

Markers may be added to specific positions or to the position the user has clicked last on the map, removed, activated, deactivated or centered using the infoprop property. As mentioned above in the section General Usage, a marker may be used to set the map's view if it is told to center on the marker.

Each marker may have an infoText that is shown within the pop-up when the marker is selected by the user. Changes to this text will be updated on the client side. If no text is set, a pop-up will not appear. Since the infoText is treated as HTML code, it may be formatted like HTML. Only breaks will automatically be replaced.

The GOOGLEMAP2 control listens to changes on markers, address (or latitude/longitude) and infoText property.

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Typical Problems

The following topics are covered below:

Google Map API Key

Your Google Maps API key is bound to a directory on a certain web server (i.e. you sign up for the URL http://mycomputer.mydomain.com:8080/mywebapp/myproject). If you use your key for another URL, Google shows an error message:

Error message

Reasons that cause the error:

Map Remains Gray

If you use longitude and latitude for placing the marker on the map, their values may exceed the map top (or bottom) border. If you are able to find the map by scrolling down (or up), then this is the case. Check the values for longitude and latitude in this case.

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Properties

Basic
infoprop

Name of adapter property representing the control on server side.

The property must be of type GOOGLEMAPInfo. Read further information inside the Java API Documentation.

Obligatory  
apikeypagename

Name of the Maps API Key page. Example: mygooglemapsapikey.html. Keep this file within the project directory (directory within the CIS HTML pages are kept). The GOOGLEMAP-control expects this file within certain Javascript includes and content. Have look into chapter "Google Map - Before You Start" within the Developers Guide

Obligatory  
width

Width of the control.

There are three possibilities to define the width:

(A) You do not define a width at all. In this case the width of the control will either be a default width or - in case of container controls - it will follow the width that is occupied by its content.

(B) Pixel sizing: just input a number value (e.g. "100").

(C) Percentage sizing: input a percantage value (e.g. "50%"). Pay attention: percentage sizing will only bring up correct results if the parent element of the control properly defines a width this control can reference. If you specify this control to have a width of 50% then the parent element (e.g. an ITR-row) may itself define a width of "100%". If the parent element does not specify a width then the rendering result may not represent what you expect.

Optional

100

120

140

160

180

200

50%

100%

height

Height of the control.

There are three possibilities to define the height:

(A) You do not define a height at all. As consequence the control will be rendered with its default height. If the control is a container control (containing) other controls then the height of the control will follow the height of its content.

(B) Pixel sizing: just input a number value (e.g. "20").

(C) Percentage sizing: input a percantage value (e.g. "50%"). Pay attention: percentage sizing will only bring up correct results if the parent element of the control properly defines a height this control can reference. If you specify this control to have a height of 50% then the parent element (e.g. an ITR-row) may itself define a height of "100%". If the parent element does not specify a width then the rendering result may not represent what you expect.

Optional

100

150

200

250

300

250

400

50%

100%

comment

Comment without any effect on rendering and behaviour. The comment is shown in the layout editor's tree view.

Optional  
Appearance
pagestyle

CSS style definition that is directly passed into this control.

With the style you can individually influence the rendering of the control. You can specify any style sheet expressions. Examples are:

border: 1px solid #FF0000

background-color: #808080

You can combine expressions by appending and separating them with a semicolon.

Sometimes it is useful to have a look into the generated HTML code in order to know where direct style definitions are applied. Press right mouse-button in your browser and select the "View source" or "View frame's source" function.

Optional  
rowspan

Row spanning of control.

If you use TR table rows then you may sometimes want to control the number of rows your control occupies. By default it is "1" - but you may want to define the control two span over more than one columns.

The property only makes sense in table rows that are snychronized within one container (i.e. TR, STR table rows). It does not make sense in ITR rows, because these rows are explicitly not synched.

Optional

1

2

3

4

5

50

int-value

colspan

Column spanning of control.

If you use TR table rows then you may sometimes want to control the number of columns your control occupies. By default it is "1" - but you may want to define the control to span over more than one columns.

The property only makes sense in table rows that are snychronized within one container (i.e. TR, STR table rows). It does not make sense in ITR rows, because these rows are explicitly not synched.

Optional

1

2

3

4

5

50

int-value

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