[mapguide-users] Re: Showing running numbers of selected items

[Alex Kob]

Hello, David.

Here is brief description of my working solution:

1. Create a widget named SelectionLabels for example. It has one meaningful
method: displayLabels which would send ajax request to server-side script to
enable/disable labels.
In method initializeWidget insert following code:

this.getMap().registerForEvent(Fusion.Event.MAP_SELECTION_ON,
OpenLayers.Function.bind(this.selectionOn, this)); 
this.getMap().registerForEvent(Fusion.Event.MAP_SELECTION_OFF,
OpenLayers.Function.bind(this.selectionOff, this)); 

It will activate or deactivate labels. Methods selectionOn and selectionOff
are simple:

selectionOn: function() {
    this.displayLabels(true);
},

selectionOff: function() {
    this.displayLabels(false);
},

2. Create a server-side script for widget. It will receive request to
enable/disable labels and process it as follows:
- create a new dynamic feature source for points
- create a new dynamic layer for placing labels. I have create a special
symbol for labels and setup layer template so that symbols is used for point
stylization. Layer must use previously created feature source.
- get selection and add new features (as point geometry) to feature source.
- add layer to map

3. To create labels when selection is set, you have to include div with your
widget to application:
<div id="SelectionLabels"></div>

Done!

I could give a more detailed description of these steps if you need it.


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