topic Re: Dynamic Legend widget for Flexviewer 2.0 in ArcGIS API for Flex Questions

Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Thu, 29 Jul 2010 20:18:06 GMT

All,

I am happy to announce the first community developed (and shared on the code gallery) widget for the Flexviewer 2.0. I have finalized my Dynamic Legend Widget for the 2.0 FlexViewer and shared it for all to use.

This version is COMPLETELY dependent on 2 things

ArcGIS Server 10 map services

Flex Viewer 2.0 and obviously Flex API 2.0

I have made it XML configurable this time so that you can specify that certain map services or certain layers in a map service are not to be displayed in the widget.

It is called dynamic because the legend will only draw map services and layer that are visible in your map. It respects scale dependency of layers and if the layer is checked in the TOC or operational layer TOC. The legend automatically redraws when layers have been checked/unchecked and when zooming in or out and a layer scale dependency has been meet.

I hope you enjoy it and I HOPE that you read and understand that it will not work with mapservices that are not served from a ArcGIS 10 Server.

http://www.arcgis.com/home/item.html?id=f60406b9f52340d59eb557bf64136af6

PS. don't forget to rate the code.

Re: Dynamic Legend widget for Flexviewer 2.0

SimonMorgan — Mon, 02 Aug 2010 12:01:00 GMT

I apologize if I am missing something, but should the download incldue a swf or do I need to compile it myself?

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Mon, 02 Aug 2010 12:11:34 GMT

Simon,

You do need to compile it your self. I have always had bad experiences distributing compiled swfs in the past.

Re: Dynamic Legend widget for Flexviewer 2.0

SimonMorgan — Mon, 02 Aug 2010 12:21:57 GMT

Thanks for the reply, just making sure. Just having some issues with compiling right now, says unable to open 'locale/en_US'.

Re: Dynamic Legend widget for Flexviewer 2.0

SimonMorgan — Mon, 02 Aug 2010 12:24:31 GMT

Thanks for the reply, just making sure. Just having some issues with compiling right now, says unable to open 'locale/en_US'.

Although, I should point out this happens when I try to compile with your widget too, so I will just keep researching. Thank you for all the time and effort you put into helpign the flex community!!

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Mon, 02 Aug 2010 12:45:30 GMT

Simon,

Make sure you have locale/{locale} added as a source path in your flexviewer project properties under the "Flex Build Path".

Also ensure you have these "additional compiler arguments" added to the "Flex Compiler" page: -locale en_US -source-path=locale/{locale}

Re: Dynamic Legend widget for Flexviewer 2.0

SimonMorgan — Mon, 02 Aug 2010 13:42:29 GMT

I have all that in there, I have tried both with {locale} and with specifying "en_US". I still get the issue. I apologize for hijackign your thread here.

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Tue, 10 Aug 2010 09:00:14 GMT

Hi Robert

I've already successfully implemented the first dynamic legend that you published a while back. However I am now interested in only showing the visible layers that have been selected in the legend.

I tried implementing your code - I am using Adobe Flash Builder 4 - but I receive the following error :
" Unable to locate specified base class 'com.esri.viewer.BaseWidget' for component class 'com.esri.solutions.flexviewer.widgets.DynamicLegend.DynamicLegendWidget'."

When i change the "viewer" namespace to "flexviewer", it returns the following error:
" The prefix "flexviewer" for element "flexviewer:BaseWidget" is not bound."

Your help would be kindly appreciated.
Thanks for all the other magnificent samples 🙂

Kirti

All,

I am happy to announce the first community developed (and shared on the code gallery) widget for the Flexviewer 2.0. I have finalized my Dynamic Legend Widget for the 2.0 FlexViewer and shared it for all to use.

This version is COMPLETELY dependent on 2 things

ArcGIS Server 10 map services

Flex Viewer 2.0 and obviously Flex API 2.0

I have made it XML configurable this time so that you can specify that certain map services or certain layers in a map service are not to be displayed in the widget.

It is called dynamic because the legend will only draw map services and layer that are visible in your map. It respects scale dependency of layers and if the layer is checked in the TOC or operational layer TOC. The legend automatically redraws when layers have been checked/unchecked and when zooming in or out and a layer scale dependency has been meet.

I hope you enjoy it and I HOPE that you read and understand that it will not work with mapservices that are not served from a ArcGIS 10 Server.

http://www.arcgis.com/home/item.html?id=f60406b9f52340d59eb557bf64136af6

PS. don't forget to rate the code.

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Tue, 10 Aug 2010 10:04:02 GMT

Kirti,

   You didn't miss this part did you?

This version is COMPLETELY dependent on 2 things

   1. ArcGIS Server 10 map services
   2. Flex Viewer 2.0 and obviously Flex API 2.0

It sound like you are trying to use the Sample Flex Viewer 1.x.

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Tue, 10 Aug 2010 11:59:03 GMT

I unfortunately did 😮 My apologies, think I was a bit to eager to implement this functionality.

Could you perhaps guide me in the direction for this same functionality for Sample Flex Viewer. I have read previous threads in the old forums but they were a bit complicated and I am a beginner at flex.

Thanks.

Kirti,

   You didn't miss this part did you?

This version is COMPLETELY dependent on 2 things

   1. ArcGIS Server 10 map services
   2. Flex Viewer 2.0 and obviously Flex API 2.0

It sound like you are trying to use the Sample Flex Viewer 1.x.

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Tue, 10 Aug 2010 15:36:08 GMT

Kirti.

Since you already have the 1.x version working it will not be hard for me to provide you with the code to replace. I will post something hopefully later today.

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Sat, 11 Dec 2021 10:29:13 GMT

Kirti,

Try this

//Add this import at the top with the others
import mx.binding.utils.ChangeWatcher;

//replace your existing function with this one
private function showStateLegend(event:MouseEvent):void
   {
    WidgetEffects.flipWidget(this, viewStack, "selectedIndex", 1, 400);
    //This is where we determine if this is the first call to make
    //the legend or do we just need to update it
    if (legendRepeater.dataProvider != null){
     updateLegend();
    } else {
     showMessage("Please be patient while the Legend is generated...", true);
     var liveLayers:Array = getLayers(); 
     var url:String; 
     for (var i:int = 0; i < liveLayers.length;i++) {
      if (liveLayers is ArcGISDynamicMapServiceLayer) {
       if (ArcGISDynamicMapServiceLayer(liveLayers).id != "Aerial Photography")
       {
        requestCount++;           
        url = ArcGISDynamicMapServiceLayer(liveLayers).url.replace("rest/", "");
        webService.generateLegends.send(url, 96, 20, 20, ArcGISDynamicMapServiceLayer(liveLayers).id);
        ChangeWatcher.watch(ArcGISDynamicMapServiceLayer(liveLayers), "visibleLayers", updateLegend2);
       }         
      } else if (liveLayers is ArcGISTiledMapServiceLayer) {
       requestCount++;
       url = ArcGISTiledMapServiceLayer(liveLayers).url.replace("rest/", "");
       webService.generateLegends.send(url, 96, 20, 20, ArcGISTiledMapServiceLayer(liveLayers).id);
       ChangeWatcher.watch(ArcGISTiledMapServiceLayer(liveLayers), "visibleLayers", updateLegend2);
      }     
     }     
    }
   }

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Sat, 11 Dec 2021 10:29:16 GMT

My apologies Robert, I really am a newbie to flex and currently quite confused :(.

I used the dynamic legend sample at http://resources.esri.com/arcgisserver/apis/flex/index.cfm?fa=codeGalleryDetails&scriptID=16838.
I then used the code from LegendExample.mxml and added it to a live layer that we have created. This is shown below,

private function showStateLegend(event:MouseEvent):void
{
WidgetEffects.flipWidget(this, viewStack, "selectedIndex", 4, 400);
             LoadLegend();
}

private function LoadLegend() : void
{
displayMessage("Please wait while the legend loads", true);
lr.addEventListener(LegendEvent.COMPLETE, handleLegendComplete);

// to get the soap url from the rest url, simply replace the word "rest"
soap_url = rest_url.replace("/rest/services/","/services/");
r.RetrieveLegend(soap_url);
}

public function handleLegendComplete(event:LegendEvent) : void
{
var leg:Legend = new Legend();
leg.initialize();
leg.LegendData = lr.getLegendInfo();

PopUpManager.addPopUp(IFlexDisplayObject(leg), this, false);    leg.move(8, 115);
leg.height = 500;
}

I made no other changes to the remainder of the files included in the sample.

So, I'm unsure where exactly to place this bit of code you suggested, as there is no "updateLegend()" function anywhere within the code.

Sorry for the trouble.

Kirti,

Try this

//Add this import at the top with the others
import mx.binding.utils.ChangeWatcher;

//replace your existing function with this one
private function showStateLegend(event:MouseEvent):void
   {
    WidgetEffects.flipWidget(this, viewStack, "selectedIndex", 1, 400);
    //This is where we determine if this is the first call to make
    //the legend or do we just need to update it
    if (legendRepeater.dataProvider != null){
     updateLegend();
    } else {
     showMessage("Please be patient while the Legend is generated...", true);
     var liveLayers:Array = getLayers(); 
     var url:String; 
     for (var i:int = 0; i < liveLayers.length;i++) {
      if (liveLayers is ArcGISDynamicMapServiceLayer) {
       if (ArcGISDynamicMapServiceLayer(liveLayers).id != "Aerial Photography")
       {
        requestCount++;           
        url = ArcGISDynamicMapServiceLayer(liveLayers).url.replace("rest/", "");
        webService.generateLegends.send(url, 96, 20, 20, ArcGISDynamicMapServiceLayer(liveLayers).id);
        ChangeWatcher.watch(ArcGISDynamicMapServiceLayer(liveLayers), "visibleLayers", updateLegend2);
       }         
      } else if (liveLayers is ArcGISTiledMapServiceLayer) {
       requestCount++;
       url = ArcGISTiledMapServiceLayer(liveLayers).url.replace("rest/", "");
       webService.generateLegends.send(url, 96, 20, 20, ArcGISTiledMapServiceLayer(liveLayers).id);
       ChangeWatcher.watch(ArcGISTiledMapServiceLayer(liveLayers), "visibleLayers", updateLegend2);
      }     
     }     
    }
   }

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Wed, 11 Aug 2010 11:44:28 GMT

Tom,

OK, That code is not mine, so I can not help with that. You will have to wait for this functionality until you switch to flexviewer 2.0.

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Tue, 17 Aug 2010 06:39:51 GMT

Is migrating to flex 2.0 the only solution. 😞

Thanks for all your help, Robert.
It's highly appreciated. 🙂

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Tue, 17 Aug 2010 11:00:28 GMT

Tom,

I am afraid so unless the developer of the code you are using adds the same ability you are looking for.

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Wed, 18 Aug 2010 06:27:39 GMT

Robert,

Did you perhaps write your own code for creating a dynamic legend?

Will you be willing to attach or post the complete code on this thread, please. I am really struggling to try and modify another developer's code.

Tom

Re: Dynamic Legend widget for Flexviewer 2.0

RobertScheitlin__GISP — Wed, 18 Aug 2010 11:12:47 GMT

Tom,

Here is the link

Be advised that this is not a simple thing to add...

http://forums.esri.com/Thread.asp?c=158&f=2421&t=299116&mc=139#934330

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Mon, 23 Aug 2010 07:43:37 GMT

Thanks for all your help. I'll try and implement it. 🙂

Re: Dynamic Legend widget for Flexviewer 2.0

TomJones — Tue, 24 Aug 2010 06:56:55 GMT

Robert,

My project supervisor has decided to postpone the changes until the next phase of development, i.e. until we migrate to Flex 2.0.

Thanks for all your help and I'm sure you'll here from me then.

Regards
Tom :cool: