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## 6.51. < rich:gmap >

### 6.51.1. Description

Component that presents the Google map in the JSF applications.

Figure 6.117. <rich:gmap> component

### 6.51.2. Key Features

- Presents all the Google map functionality

- Highly customizable via attributes

- No developers JavaScript writing needed to use on a pages

Table 6.210. rich : gmap attributes

Attribute Name | Description
--- | ---
binding | The attribute takes a value-binding expression for a component property of a backing bean
enableContinuousZoom | Enables continuous smooth zooming for selected browsers. Default value is "false".
enableDoubleClickZoom | Enables zooming in by a double click. Default value is "false".
enableDragging | Enables a map dragging with the mouse. Default value is "true".
enableInfoWindow | Enables Info Window. Default value is "true".
gmapKey | Google Map key. A single Map API key is valid for a single "directory" on your web server. Default value is "internal".
gmapVar | The JavaScript variable that is used to access the Google Map API. If you have more than one Google Map components on the same page, use individual key for each of them. The default variable name is "map" (without quotes).
id | Every component may have a unique id that is automatically created if omitted
lat | Initial latitude coordinate in degrees, as a number between -90 and +90. Default value is "37.9721046".
lng | Initial longitude coordinate in degrees, as a number between -180 and +180. Default value is "-122.0424842834".
locale | Used for locale definition. Default value is "getDefaultLocale()".
mapType | Initial map type. The possible values are G_NORMAL_MAP, G_SATELLITE_MAP, G_HYBRID_MAP. Default value is "G_SATELLITE_MAP".
onclick | HTML: a script expression; a pointer button is clicked
ondblclick | HTML: a script expression; a pointer button is double-clicked
oninit | JavaScript code invoked just after the Google Map object is initiated.
onkeydown | HTML: a script expression; a key is pressed down
onkeypress | HTML: a script expression; a key is pressed and released
onkeyup | HTML: a script expression; a key is released
onmousedown | HTML: script expression; a pointer button is pressed down
onmousemove | HTML: a script expression; a pointer is moved within
onmouseout | HTML: a script expression; a pointer is moved away
onmouseover | HTML: a script expression; a pointer is moved onto
onmouseup | HTML: script expression; a pointer button is released
rendered | If "false", this component is not rendered
showGLargeMapControl | Shows the GLarge control. Default value is "true".
showGMapTypeControl | Shows the Type switch control. Default value is "true".
showGScaleControl | It shows the scale control. Default value is "true".
style | CSS style(s) is/are to be applied when this component is rendered
styleClass | Corresponds to the HTML class attribute
warningMessage | The warning message that appears if a browser is not compatible with Google Map. Default value is "Your browser does not support Google Maps".
zoom | Initial zoom level as a number between 1 and 18. Default value is "17".

Table 6.211. Component identification parameters

Name | Value
--- | ---
component-type | org.richfaces.Gmap
component-class | org.richfaces.component.html.HtmlGmap
component-family | org.richfaces.Gmap
renderer-type | org.richfaces.GmapRenderer
tag-class | org.richfaces.taglib.GmapTag

### 6.51.3. Creating the Component with a Page Tag

To create the simplest variant on a page use the following syntax:

Example:

    ...

        <rich:gmap gmapKey="..."/>

    ...

### 6.51.4. Creating the Component Dynamically Using Java

Example:

    import org.richfaces.component.html.HtmlGmap;

    ...

    HtmlGmap myMap = new HtmlGmap();

    ...

### 6.51.5. Details of Usage

To use Google Map in your application, generate a key on Google Map official resource. One key could be used for one directory on the server.

Here are the main settings of initial rendering performed with a component map that are accessible with the following attributes:

- "zoom" defines an approximation size (boundary values 1-18)

- "lat" specifies an initial latitude coordinate in degrees, as a number between -90 and +90

- "lng" specifies an initial longitude coordinate in degrees, as a number between -180 and +180

- "mapType" specifies a type of a rendered map (G_NORMAL_MAP, G_SATELLITE_MAP (DEFAULT), G_HYBRID_MAP)

For example, the city of Paris is shown after rendering with the following initial settings: "lat" = 48.44, "lng" = 2.24 and "zoom" = 5.

Figure 6.118. <rich:gmap> initial rendering

It's also possible to set accessible controls on the map with the help of the attributes:

- "showGMapTypeControl" determines whether the controls for a map type definition are switched on

- "showGScaleControl" determines whether the controls for scaling are switched on

- "showGLargeMapControl" determines whether the control for map scale rendering is rendered

Figure 6.119. <rich:gmap> accessible controls

To set all these parameters and perform some activity (Zoom In/Out etc.) is possible with your JavaScript, i.e. declare a name of an object on a map in the "gmapVar" attribute and then call the object directly with API Google Map.

For example, to approximate a map for "gmapVar" = "map" declared inside the component, call map.zoomIn() on an event.

Moreover, to add e.g. some JavaScript effects, events defined on it are used.

- onmouseover

- onclick

- onmouseout

- etc.

## Note

Google Map does not support XHTML format of the page. Thus, if you use Facelets and JSF 1.2, do not forget to put the following tags somewhere on the page:

    ...

    <f:view contentType="text/html">...</f:view>

    ...

### 6.51.6. Look-and-Feel Customization

<rich:gmap> component isn't tied to skin parameters, as there is no additional elements on it, except the ones provided with Google Map.

### 6.51.7. Definition of Custom Style Classes

Table 6.212. Classes names that define a component appearance

Class name | Description
--- | ---
rich-gmap | Defines styles for a wrapper <div> element of a component

In order to redefine styles for all <rich:gmap> components on a page using CSS, it's enough to create classes with the same names (possible classes could be found in the tables above) and define necessary properties in them.

Example:

    ...

    .rich-gmap{

        font-style:italic;

    }

    ...

This is a result:

Figure 6.120. Redefinition styles with predefined classes

In the example the font style for buttons was changed.

Also it’s possible to change styles of particular <rich:gmap> component. In this case you should create own style classes and use them in corresponding <rich:gmap> styleClass attributes. An example is placed below:

Example:

    ...

    .myClass{

        font-weight:bold;

    }

    ...

The "styleClass" attribute for <rich:gmap> is defined as it’s shown in the example below:

Example:

    <rich:gmap ... styleClass="myClass"/>

This is a result:

Figure 6.121. Redefinition styles with own classes and "styleClass" attributes

As it could be seen on the picture above, the font weight for buttons was changed.

### 6.51.8. Relevant Resources Links

Here you can see the example of <rich:gmap> usage and sources for the given example.

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