TopCommandArea Module

RhoElements 2.x API


The TopCommandArea Module is used to set the parameters of the Top Command Area, a region at the top of the screen designed to separate RhoElements controls such as the address bar or Go button from other parts of an application.


topCommandArea (Module) <META> Syntax

<META HTTP-Equiv="TopCommandArea" content="[parameter]">

TopCommandArea JavaScript Object Syntax:
By default the JavaScript Object 'topCommandArea' will exist on the current page and can be used to interact directly with the topCommandArea.
To Set topCommandArea parameters via JavaScript use the following syntax: topcommandarea.parameter = 'value'; remembering to enclose your value in quotes where appropriate.

e.g. topCommandArea.visibility = 'value';

To set multiple EMML parameters / events on a single line use the following syntax: topcommandarea.setEMML("[Your EMML Tags]");

e.g. topCommandArea.setEMML("visibility:value");


Items listed in this section indicate parameters, or attributes which can be set.

NamePossible ValuesDescriptionDefault Value
visibility:[Value] Visible, HiddenSets the visibility of the top command area.Hidden.
height:[Value] Positive number, representing pixelsSets the height of the top command areaSlightly greater than the height of a buttons default height, which depends on the screen resolution.
color:[Value] Color in the #RRGGBB formatThe color to set the top command area to.None. The default image is displayed by default.
image:[Value] URLSets the image to be displayed on the top command area. See Remarks.Default image


Default Positions

By default this control will be placed a the top of the screen. On Windows Mobile if the 'FullScreen' configuration setting is disabled the control will need to be moved, otherwise it will appear beneath the task bar.

Switching to Other Applications

All controls are designed to be shown on top of RhoElements. If you require to switch to an application other than RhoElements you should minimize RhoElements to ensure the buttons do not remain shown. (Not applicable to Enterprise Tablet)

Screen Orientation

When the screen orientation changes, either using the ScreenOrientation tag or by rotating a device with hardware support, the command areas will automatically move and resize to fit the new layout. However the buttons themselves are not moved and in some cases this may result in them being off the screen or not in the expected position. If so they must be moved manually by detecting the ScreenOrientationEvent.


RhoElements Version1.0.0 or above
Supported DevicesAll supported devices.
Minimum RequirementsNone.
PersistencePersistent - Changes to this module will persist when navigating to a new page.

HTML/JavaScript Examples

The following example shows the Top Command Area, sets the Height to 100 and background color to red

<META HTTP-Equiv="TopCommandArea" Content="Visibility:Visible">
<META HTTP-Equiv="TopCommandArea" Content="Height:100">
<META HTTP-Equiv="TopCommandArea" Content="Color:#FF0000">

The following example shows the Top Command Area, sets the height to 100 and displays image tca.gif on it (resizing the image if necessary)

<META HTTP-Equiv="TopCommandArea" Content="Height:100; Visibility:Visible; Image:url('http://myaddress/tca.gif')">