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Filtering a Flex tilelist using RegExp

Posted on 2009-04-10
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Last Modified: 2012-05-06
I'm trying to filter a Flex tilelist that's populated via XMLListCollection with a RegExp.  I created the following code for a datagrid that works.  But when applied to a tilelist, I get a "value is not a function".  I guess the problem is in the item.text() portion.  But anyone know how I could get this to work with the tileList?
private function filterFunc(item:Object):Boolean {
		var allWords:String=searchField.text;
		allWords = allWords.replace(/\s+/g,"|");					
                return item.text().match(new RegExp(allWords, "i"));
}

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Question by:moglie
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Expert Comment

by:käµfm³d 👽
ID: 24120665
My guess would be that you need quotes around the regex in line 3:
allWords = allWords.replace("/\s+/g","|");

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Author Comment

by:moglie
ID: 24120714
Using the quotes didn't change anything.  Still getting that "not a function" error.  Someone on another forum mentioned that an item of type object doesn't have a method called text and that's causing the problem.  But I don't know, it works on a datagrid as expected.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 24120730
Did you try taking the parens of of text?

I am not a flex programmer, but I'm just trying to be logical, so please forgive me if I sound retarded :)
return item.text.match(new RegExp(allWords, "i"));

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Author Comment

by:moglie
ID: 24120763
I've tried all the small trial-and-error things like that but it's still the same error.
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Expert Comment

by:Fuzzy_Logic_
ID: 24121521
I would pass a String in to the function, instead of an object.

Then before you call the function, you would cast the item to a string

ie.




 ...
 ..
 .    
 
 var itemText:String = item.text as String; // You could do this in the function, But this way only a Sting can be passed to the function rather than any object, which gives runtime errors rather than compile time errors.
 
 var isFiltered:Boolean = filterFunction(itemText); // call the function
 
 .
 
private function filterFunc(itemText:String):Boolean 
    {
                var allWords:String=searchField.text;
                allWords = allWords.replace(/\s+/g,"|");
     
                return itemText.match(new RegExp(allWords, "i"));
    }

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Author Comment

by:moglie
ID: 24121585
Must be getting close here.  There's one error popping up on the line
var itemText:String = item.text as String;  "access to undefined property item"
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Expert Comment

by:Fuzzy_Logic_
ID: 24121627
item is just a variable to hold your object. you need to assign that variable as something.

ie the object that you passed into the filterFunc(item:Object):Boolean before. I assume that it is an object in the TileList
 ...
 ..
 .   
 
 var item:Object = yourObject // this is the object that you were trying to pass to the function before 
 
 var itemText:String = item.text as String; // You could do this in the function,
                                               But this way only a String can be passed to the function rather than any object,
                                               which gives runtime errors rather than compile time errors.
 
 var isFiltered:Boolean = filterFunction(itemText); // call the function
 
 .
 
private function filterFunc(itemText:String):Boolean 
    {
                var allWords:String=searchField.text;
                allWords = allWords.replace(/\s+/g,"|");
     
                return itemText.match(new RegExp(allWords, "i"));
    }

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Author Comment

by:moglie
ID: 24121646
My original code worked on a datagrid and I never referenced item anywhere....so maybe item  is part of   the datagrid component?  Now I'm getting really lost. haha
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Expert Comment

by:Fuzzy_Logic_
ID: 24121663
ok, so that your code works just change your function to this, however if you pass an object without a text property it will throw an error.
private function filterFunc(item:Object):Boolean
    {
        var allWords:String=searchField.text;
        allWords = allWords.replace(/\s+/g,"|");
 
        var itemText:String = item.text as String;
        
        return itemText.match(new RegExp(allWords, "i"));
}

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Author Comment

by:moglie
ID: 24121696
Yeah, the error that comes up is can't access a property of a null item..  It's looking like this can't be done.
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Expert Comment

by:Fuzzy_Logic_
ID: 24121709
If you post code that calls this function, there is a way.
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Author Comment

by:moglie
ID: 24121769
This is all the relevant code:

            private function filterFunc(item:Object):Boolean {
                              var allWords:String=stateName.text;
                              allWords = allWords.replace(/\s+/g,"|");                              
                      return item.text().match(new RegExp(allWords, "i"));
            }


      <mx:XML id="xml" source="gallery.xml"/>
      <mx:XMLListCollection id="xmlListColl" source="{xml.image}"  filterFunction="filterFunc"  />

      <mx:TileList id="tileList" dataProvider="{xmlListColl}"       columnCount="3" columnWidth="200"
                  rowCount="2" rowHeight="200" themeColor="haloSilver" verticalScrollPolicy="on" itemClick="tileList_itemClick(event);" >
         <mx:itemRenderer>
            <mx:Component>
               <mx:VBox paddingLeft="30" width="150" height="150" horizontalScrollPolicy="off" verticalScrollPolicy="off">
                  <mx:Image height="50" width="50" source="{data.@thumbnailImage}" />
                  <mx:Label id="foo" text="{data.@title}" />
               </mx:VBox>
            </mx:Component>
         </mx:itemRenderer>            
      </mx:TileList>
      <mx:TextInput id="searchField" change="xmlListColl.refresh()"/>
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Expert Comment

by:Fuzzy_Logic_
ID: 24121806
This error would have come back if the parenthesis had been removed from:
       return item.text().match(new RegExp(allWords, "i")); it should have been:

       return item.text.match(new RegExp(allWords, "i"));

Anyway item is the XML object created, so you just need the name of the node that you want to filter, which appears to be title?


private function filterFunc(item:Object):Boolean // item is an XML object
    {
        var allWords:String=searchField.text;
        allWords = allWords.replace(/\s+/g,"|");
 
        var itemText:String = item.@title as String; // here is where you want
                                                     // to put the name of the node you want to filter.
        
        return itemText.match(new RegExp(allWords, "i"));
}

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Author Comment

by:moglie
ID: 24122029
Still getting a null object.  There's also a warning on the return line "array used where a boolean value is expected"  I've attached a test file if that would help.  Maybe the xml is causing the problem?
<gallery>
	<image title="Flex"
		thumbnailImage="assets/fx_appicon-tn.gif"
		fullImage="assets/fx_appicon.jpg"/>
	<image title="Flash n lots of stuff"
			thumbnailImage="assets/fl_appicon-tn.gif"
			fullImage="assets/fl_appicon.jpg"/> 
	<image title="Illustrator"
			thumbnailImage="assets/ai_appicon-tn.gif"
			fullImage="assets/ai_appicon.jpg"/> 
	<image title="Dreamweaver"
			thumbnailImage="assets/dw_appicon-tn.gif"
			fullImage="assets/dw_appicon.jpg"/> 
	<image title="ColdFusion"
			thumbnailImage="assets/cf_appicon-tn.gif"
			fullImage="assets/cf_appicon.jpg"/> 
	<image title="Flash Player"
			thumbnailImage="assets/fl_player_appicon-tn.gif"
			fullImage="assets/fl_player_appicon.jpg" />
</gallery>

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Accepted Solution

by:
Fuzzy_Logic_ earned 500 total points
ID: 24122839
Back from taking kids out,

This is what your filterFunc needs to be:
              private function filterFunc(item:XML):Boolean
                 {
                    var allWords:String=searchField.text;
                    allWords = allWords.replace(/\s+/g,"|");
 
                    var itemText:String = item.attribute("title").toString();
        
                    var isMatch:Boolean = false;
                    
                    if (itemText.match(new RegExp(allWords, "i")) != null)
                        {
                            isMatch = true;
                        }
                        
                        return isMatch;
                }

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Author Closing Comment

by:moglie
ID: 31569132
Thanks!  Finally working now.
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