[Chameleon-dev] [Bug 1068] New: Add query-highlight functionality to js api

bugzilla-daemon at bugzilla.maptools.org bugzilla-daemon at bugzilla.maptools.org
Fri May 27 08:26:05 EDT 2005


           Summary: Add query-highlight functionality to js api
           Product: Chameleon
           Version: 2.2
          Platform: PC
        OS/Version: Windows 2000
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Core
        AssignedTo: chameleon-dev at lists.maptools.org
        ReportedBy: bartvde at xs4all.nl

So we don't forget about this one. Probably TARGET FUTURE.

Hi list,

I have managed to get this running, so I thought I'd share my solution. My
approach needed changes to UpdateMap.php only. Paul/Julien, are there plans for
adding query highlight functionality to UpdateMap.php? Would you guys be
interested in getting this in the Chameleon distro?

My approach does have an assumption: all layers which need to be
query-highlighted need to have a FILTERITEM defined (using an empty FILTER "" in
order to get everything rendered). I like this approach better than a client
having to send the name of a column to the server.

When a node from the treeview is clicked, I run the following javascript (this
is now part of my custom js file included in my app, but could become part of
cwcjsapi.js in the future) :

function CWCRunQuery(layername, filter)

     aHiddenVars = new Array(3);
     aHiddenVars[0] = new Array(2);
     aHiddenVars[0][0] =  "LAYER_RUN_QUERY";
     aHiddenVars[0][1] = "1";

     aHiddenVars[1] = new Array(2);
     aHiddenVars[1][0] =  "LAYER_NAME";
     aHiddenVars[1][1] = layername;

     aHiddenVars[2] = new Array(2);
     aHiddenVars[2][0] =  "LAYER_FILTER";
     aHiddenVars[2][1] = filter;

      // we need to update the map as well
     goCWCJSAPI.CallServer("goCWCJSAPI.MapExtentsUpdated()", aHiddenVars);
     return true;

The changes I did to UpdateMap.php are (adding a selection layer dynamically
which is a copy of the layer which needs to be query-highlighted, and setting
the color to a selection color):

    $oMap = $oMapSession->oMap;

    // if selection layer exists, delete it first
    for ( $i=0; $i<$oMap->numlayers;  $i++ )
      $oTempLayer = $oMap->getlayer($i);
      if ( $oTempLayer->name == 'StraGISWebSelection' )
        $oTempLayer->set( 'status', MS_DELETE );

    $szLayerName = "";
    if (isset($HTTP_FORM_VARS["LAYER_NAME"]))
      $szLayerName = $HTTP_FORM_VARS["LAYER_NAME"];

    $szFilter = "";
    if (isset($HTTP_FORM_VARS["LAYER_FILTER"]))
      $szFilter = $HTTP_FORM_VARS["LAYER_FILTER"];

    for ($i=0; $i<$oMap->numlayers; $i++)
      $oLayer = $oMapSession->oMap->GetLayer($i);
      if ($oLayer->name == $szLayerName)
        // copy layer
        $oSelectionLayer = ms_newLayerObj( $oMap, $oLayer );
        $oSelectionLayer->set( 'name', 'StraGISWebSelection' );
        $oSelectionLayer->set( 'template', '' );
        // set color to selection color
        for( $j=0; $j < $oSelectionLayer->numclasses; $j++)
          $oClass = $oSelectionLayer->getClass($j);
          for ($k=0;$k<$oClass->numstyles;$k++)
            $oStyle = $oClass->getStyle($k);
            $oStyle->color->setRGB( 255,255,0 );
        $oSelectionLayer->set( 'status', MS_ON );
    $_SESSION["gszCurrentState"] = $oMapSession->saveState();

Best regards,

Bart van den Eijnden
Postbus 270
2600 AG  DELFT

tel.nr.: 015-7512436
email: BEN at Syncera-ITSolutions.nl

>>> "Bart van den Eijnden" <BEN at syncera-itsolutions.nl> 05/17/05 04:41pm >>>
Hi list,

I am faced with the following problem:

I have a treeview next to my MapDHTML. When a node in the treeview is clicked, I
need to highlight the item in the map. I do know how to do this with
PHP/Mapscript (savequery etc.), but I don't know how to do this from the js api

I can't see any place in the JS API to pass a query and request for an updated map.

Would this require changes to the UpdateMap.php file as well as the cwcjsapi.js
file? Or am I missing something? What would be the best approach for this?

Best regards,

Bart van den Eijnden
Postbus 270
2600 AG  DELFT

tel.nr.: 015-7512436
email: BEN at Syncera-ITSolutions.nl 

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