[mapguide-users] What is %24CurrentSelection???

[achectl]

I would like to delineate how I do the invokeURL command as below:

My system:
MapGuide 2009
PHP bundle option
Window XP Pro
MapGuide Studio 2009

http://n2.nabble.com/file/n2490302/1.jpg 
1.	I use Sheboygan demo data 
2.	create the invokeurl commands of flexible web layout
3.	URL to invoke is http://127.0.0.1/date.php
4.	Key is the ID; Value is $CurrentSelection
5.	Layer is the Buildings (SDF)

http://n2.nabble.com/file/n2490302/2.jpg  
1.	Building selected
2.	InvokeURL command highlighted

http://n2.nabble.com/file/n2490302/3.jpg 
1.	New window prompted
2.	The url is http://127.0.0.1/date.php?ID=%24CurrentSelection

My question is why the ID value is %24CurrentSelection, it is not the ID of
the building layer attribute?
Or I have do wrong setting?

Notes: I have amended a little of invokeURL.js. I coped it as below:

/**
 * Fusion.Widget.InvokeURL
 *
 * $Id: $
 *
 * Copyright (c) 2007, DM Solutions Group Inc.
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
"Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */


/***************************************************************************
 * Class: Fusion.Widget.InvokeURL
 *
 * A widget that will open the configured URL in the target element.
 * 
 * If the Target property points to TaskPane widget, the task will be listed
in
 * the menu list of the TaskPane and loaded there.
 * Otherwise if the target is an existing HTML elementt in the page it will
be 
 * loaded there, otherwise it will open a new window with that name.
 *
 * **********************************************************************/

Fusion.Widget.InvokeURL = Class.create();
Fusion.Widget.InvokeURL.prototype = {
    sFeatures : 'menubar=yes,location=no,resizable=yes,status=yes',

    initialize : function(widgetTag) {
        //console.log('InvokeURL.initialize');
        Object.inheritFrom(this, Fusion.Widget.prototype, [widgetTag,
false]);
        Object.inheritFrom(this, Fusion.Tool.ButtonBase.prototype, []);

        var json = widgetTag.extension;
        this.sTarget = json.Target ? json.Target[0] : "InvokeUrlWindow";
        this.sBaseUrl = json.Url[0];  //must be supplied
        
        this.bSelectionOnly = (json.DisableIfSelectionEmpty &&
                           (json.DisableIfSelectionEmpty[0] == 'true' ||
                            json.DisableIfSelectionEmpty[0] == '1')) ? true
: false;
                            
        this.additionalParameters = [];
        if (json.AdditionalParameter) {
            for (var i=0; i<json.AdditionalParameter.length; i++) {
                var p = json.AdditionalParameter[i];
                var k = p.Key[0];
                var v = p.Value[0];
                this.additionalParameters.push(k+'='+encodeURIComponent(v));
            }
        }
        
        this.enable = Fusion.Widget.InvokeURL.prototype.enable;
        this.getMap().registerForEvent(Fusion.Event.MAP_SELECTION_ON,
this.enable.bind(this));
        this.getMap().registerForEvent(Fusion.Event.MAP_SELECTION_OFF,
this.enable.bind(this));
        this.disable();
    },

    enable: function() {
        var map = this.getMap();
        if (this.bSelectionOnly || !map) {
            if (map && map.hasSelection()) {
                if (this.action) {
                    this.action.setEnabled(true);
                } else {
                    Fusion.Tool.ButtonBase.prototype.enable.apply(this,[]);
                }
            } else {
                if (this.action) {
                    this.action.setEnabled(false);
                } else {
                    this.disable();
                }
            }
        } else {
            if (this.action) {
                this.action.setEnabled(true);
            } else {
                Fusion.Tool.ButtonBase.prototype.enable.apply(this,[]);
            }
        }
    },
    
    execute : function() {
        var url = this.sBaseUrl;
        //add in other parameters to the url here
        
        var map = this.getMap();
        var params = [];
        //params.push('LOCALE='+Fusion.locale);
        //params.push('SESSION='+map.getSessionID());
        //params.push('MAPNAME='+map.getMapName());
        params = params.concat(this.additionalParameters);
        if (url.indexOf('?') < 0) {
            url += '?';
        } else if (url.slice(-1) != '&') {
            url += '&';
        }
        url += params.join('&');
        var taskPaneTarget = Fusion.getWidgetById(this.sTarget);
        if ( taskPaneTarget ) {
            taskPaneTarget.setContent(url);
        } else {
            var pageElement = $(this.sTarget);
            if ( pageElement ) {
                pageElement.src = url;
            } else {
                window.open(url, this.sTarget, this.sFeatures);
            }
        }
    }
};

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