Sample : Zoom to the bounds of an object

This example documents how you can select a number of objects and then zoom to the extent of the selection.

What basically happens is we :

• Execute a startup operation (implies we zoom to the focus rectangle after execution)
• Execute a number of XML Operations inside the startup operation (selecting the objects and returning the right focus to the client).

var ofm;
 
this.zoomToExtent = function()
{
    ofm.zoomToExtent();
}

We execute the zoomToExtent() function.

We use a custom startup operation to make the selection :

var ofm;
 
this.zoomToObjects = function() {
    var layer = ofm.getSelectionLayer();
    var margin = 10;
    var operation = "\
         <Operations>\
            <SelectObjects>\
              <SelectionGroupName>FocusSelection</SelectionGroupName>\
              <DataSetName>"+ layer  +"</DataSetName>\
              <Restriction>\
                 <ModelId>1</ModelId>\
                 <Restriction>\
                    <AttributeSetName>Attributes</AttributeSetName>\
                    <AttributeName>OIDN</AttributeName>\
                    <AllowedValue>5681,5690</AllowedValue>\
                    <PatternSearch>false</PatternSearch>\
                 </Restriction>\
              </Restriction>\
              <AllowedValueSeparator>,</AllowedValueSeparator>\
           </SelectObjects>\
           <ClearFocus/>\
           <AddSelectionToFocus>\
              <SelectionGroupName>FocusSelection</SelectionGroupName>\
           </AddSelectionToFocus>\
           <GetFocus>\
              <Margin>"+ margin +"</Margin>\
           </GetFocus>\
        </Operations>";
 
    ofm.runPlainStartupOperation(operation);
}

We execute the following operations :

• SelectObjects : Select the object in a separate selectiongroup named “FocusSelection”
• ClearFocus : Clear the existing server-side focus rectangle
• AddSelectionToFocus : Add the bounds of the “FocusSelection” selectiongroup to the server-side focus rectangle.
• GetFocus : Get the server-side focus rectangle.

All these operations are executed as a “startup operation” which implies the following :

• A server-side focus rectangle may be returned and will be copied to the client-side focus rectangle.
• The client will automatically zoom to the client-side focus rectangle after execution.

The attribute value may contain a unix-style wildcard using filename expansion – also known as “globbing”.

By adding the <PatternSearch>false</PatternSearch> tag of the <Restriction> element, you can use wildcards in your attribute values. Example : [!-]* would match any string not starting with '-'.