LegendItem.MapAreaAttributes Property

Definition

Namespace:

System.Web.UI.DataVisualization.Charting

Assembly:

System.Web.DataVisualization.dll

Gets or sets the map area attributes of a legend item.

public:
 property System::String ^ MapAreaAttributes { System::String ^ get(); void set(System::String ^ value); };

[System.ComponentModel.Bindable(true)]
[System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.Attribute)]
public string MapAreaAttributes { get; set; }

[<System.ComponentModel.Bindable(true)>]
[<System.Web.UI.PersistenceMode(System.Web.UI.PersistenceMode.Attribute)>]
member this.MapAreaAttributes : string with get, set

Public Property MapAreaAttributes As String

Property Value

String

A string value that represents the attributes of corresponding map area for the legend item.

Implements

MapAreaAttributes

Attributes

BindableAttribute PersistenceModeAttribute

Remarks

If you set the MapAreaAttributes property, a client-side image map will automatically be created. A map area will also be created, with its attribute string appended to the <map> tag that corresponds to the chart object for which this property is being set.

For example, setting the Target attribute using this property and the Url property of the first data point will result in HTML code that is similar to the following code:

<img id="Chart1" usemap="#Chart1ImageMap" src="ChartPic_000002.jpg?6735e83b-f0cd-4225-8be4-047695a61040" border="0" />...
<map name="Chart1ImageMap"><area shape="rect" href="http://www.SomeDomain.ca" COORDS="69,120,106,309" target=_blank></map>

Because the entire string is appended to the <map> tag, multiple attributes should be separated with a space.

The MapAreaAttributes property can be used in conjunction with the Url property to specify map area attributes, for example, target= _blank, as well as client-side event handlers, for example, OnClick="MyEvent()".

Setting this property will have no effect if the IsMapEnabled property is set to false. Its default value is true.

Important

To create an image map in this manner, the RenderType property of the Chart object must be set to ImageTag. It is possible to create an image map when using binary streaming, but another technique must be used. For more information, see Chart Image Rendering.

Special keywords may be used when setting this property; each keyword will be replaced with some type of data from the applicable chart element. Refer to the following table for a listing of all available keywords:

Keyword	Replaced by
#VALX	X-value of the data point.
#VAL, #VALY, #VALY2, #VALY3…	Y-values of the data point.
#SER	Series name.
#LABEL	Data point label.
#INDEX	Data point index.
#PERCENT	Percentage of the data point Y-value.
#TOTAL	Total of all Y-values in the series.
#LEGENDTEXT	Legend text.

To create image maps that have user-defined coordinates, use the MapAreas property of the root Chart object. For more information, see Chart Image Rendering.

Note

This property is applicable to the entire LegendItem.