This is basically an object created to make it easy to handle the multi-valued MDX-formatted inputs being passed down to another artifacts, from a Pentaho CDE Dashboard to an Analyzer Report, for example. If the parameter is mdx-like, is multi-valued and the first is "All", then it fits!

drill-param-control.js

/*
 * This is basically an object created to make it easy to 
 * Handle the multi-valued MDX-formatted inputs being passed down to
 * another artifacts, from a CDE Dashboard to an Analyzer Report, for example
 *
 * by @marpontes
 *
 * Ex 
 *      <div id="SupplierHolder">
 *         <select multiselect>
 *             <option value="[Supplier].[All]">[Supplier].[All]</option>
 *             <option value="[Supplier].[SUP A]">[Supplier].[SUP A]</option>
 *             <option value="[Supplier].[SUP B]">[Supplier].[SUP B]</option>
 *             <option value="[Supplier].[SUP C]">[Supplier].[SUP C]</option>
 *         </select>
 *      </div> 
 *
 * <script>
 *  var cd = new DrillParamControl({
 *    selectDivId: "SupplierHolder",
 *    targetParamName : "SupplierParameter" 
 *  });
 * </script>
 *
 *
 *  ###### If [All],[A] and [C] selected:
 *     cd.getFormattedParam() -> 
 	"SupplierParameter=SUP A&SupplierParameter=SUP B&SupplierParameter=SUP C"
 *
 *  ###### With only [All] selected:
 *     cd.getFormattedParam() -> 
 	"SupplierParameter=SUP A&SupplierParameter=SUP B&SupplierParameter=SUP C"
 *
 *  ###### If [A] and [C] selected :
 *     cd.getFormattedParam() -> 
 *	"SupplierParameter=SUP A&SupplierParameter=SUP C"
 *
 *
 * On CDE
 *  1. Create the Layout holder Item [e.g. SupplierHolder];
 *  2. Create your SelectMulti component;
 *  3. Innitialize the object on a Script component 
 *     e.g.: var cd = new DrillParamControl({	selectDivId: "SupplierHolder", 
 						targetParamName: "SupplierParameter" });
 *  4. Call cd.updateLists(); on postExecution on the selectMultiComponent.
 *  5. When calling urls, simply add cd.getFormattedParam() and voilà.
 *
 */
 
var DrillParamControl = function( options ){

    if (typeof options != "object") {
		throw TypeError;
	}
	
	if (!options.selectDivId || !options.targetParamName ) {
		throw TypeError;
	}
	var _div            = options.selectDivId;
	var _paramName      = options.targetParamName;
	var _labelElement   = options.labelElement;
 
	var _selector       = "#" + _div + " select";
	var _selectorLabel  = "#" + _labelElement;
	var _selected       = $(_selector).val();
	var _selectedLabels = $(_selector+" option:selected").map(function() {return " "+$(this).html();}).get();
 	
 	/*
 	 *    Vars with all the available options. Values and Labels
 	 */
	var _optArr         = $(_selector).children().map(function() {return $(this).val();}).get();
	var _allLabels      = $(_selector+" option").map(function() {return " "+$(this).html();}).get();
	
	
	
	/* 
	 *   Removes [x].[Tudo] and keeps it for comparison
	 *   as well as the first Label "Tudo"
	 */
	var _first      = _optArr.splice(0,1).toString();
	var _firstLabel = _allLabels.splice(0,1).toString();
	
	
	/*
	 *   This method has to be called everytime that the selection changes
	 *   and/or a component/link is about to be called/clicked.
	 *   It's responsible for updating the internal variables that stores:
	 *    - The list of all values available
	 *    - The list of all labels available
	 *    - The the first value (usually [...].[All]) of options
	 *    - The the first value (usually "All") of Labels
	 *    - The list of all selected values
	 *    - The list of all selected labels
	 */
	var _updateLists = function(){	
		_optArr = $(_selector).children().map(function() {return $(this).val();}).get();
		_allLabels = $(_selector+" option").map(function() {return " "+$(this).html();}).get();
		_first = _optArr.splice(0,1).toString();
		_firstLabel = _allLabels.splice(0,1).toString();
		
		_updateSelected();
	};
	
	
	/* 
	 *   Checks the component for selected values
	 *   and updates the label that tells user for selected values
	 */	
	var _updateSelected = function(){
		_selected = $(_selector).val();
		_selectedLabels = $(_selector+" option:selected").map(function() {return " "+$(this).html();}).get();
	};
	
	
	/*
	 *   Outputs to the div, the list of selected labels
	 */
	var _printSelectionLabel = function(){
        console.log("Print Selection called");
        console.log(_getSelectedLabels());
		$(_selectorLabel).html(_getSelectedLabels().toString());
	};


	/* 
	 *   Checks the selected values array for [x].[Tudo], for example
	 */		
	var _existsAllInSelected = function(){
		_updateSelected();
		return _selected===null ? false : ( _selected.indexOf(_first)>-1  );
	};
	
	/* 
	 *   Chooses which array to use. If allmember-element is selected
	 *   then it returns the array with all possible values.
	 */		
	var _getFinalArray = function(){
		return _existsAllInSelected() ? _optArr : _selected;
	};
    
    var _getSelectedLabels = function(){
        return _existsAllInSelected() ? _firstLabel : _selectedLabels;
    };
	
	/* 
	 *   Returns only the current member names from array of mdx members.
	 */		
	var _stripMdxFormat = function( arrMDX ){
		
		var arrOut = arrMDX.slice(0); // just a clone
		
		$.each(arrOut,function(key, val){
			arrOut[key] = val.substring( val.lastIndexOf("[")+1 , val.lastIndexOf("]")  );
		});
		
		return arrOut;
		
	};
	
	
	
	/*
	 * Public Methods
	 */
	return{
		
		/*
		 * Returns formatted param.
		 */
		getFormattedParam : function(){
			var returnArray =  _getFinalArray();
			
			  if(returnArray === null)
			    return null;
			returnArray = _stripMdxFormat(returnArray);
			console.log(_paramName +"="+ returnArray.toString().replace(/\,/g,'&'+_paramName+'='));
			return _paramName +"="+ returnArray.toString().replace(/\,/g,'&'+_paramName+'=');
		},
        
        /*
         * Returns the selected params to show
         * to the end user
         */
        getFormattedLabels : function(){
            return _getSelectedLabels();
        },
		
		/*
		 * Updates the param name
		 */
		 setTargetParamName : function(newName){
			_paramName = newName;
		},

        getFirstElement : function(){
            return _first;
        },
        
        getAllElementsArray : function (){
            return _optArr;
        },
        
        getSelectedElementsArray : function(){
            return _selected;
        },
        updateLists : function(paramPrintSelection){
            paramPrintSelection = paramPrintSelection || false;
            
			_updateLists();
            
            if(paramPrintSelection)
              _printSelectionLabel();
        },
        printSelectionLabel : function(){
        	_printSelectionLabel();
        }
	}
	
	
	
};//Object DrillParamControl