[mapserver-users] RE: dynamically allocated points for MAP w/ PHP

[Pushkar Pradhan]

Erwin,
Thanks, it's working.
I just found out in a php tutorial that you have to use
<SELECT NAME="var[]" MULTIPLE>
for php code to work unlike perl.
This is a good tutorial for any one interested on more:
http://www.php.net/manual/phpfi2.php#selmul
> Pushkar,
>
> What does $HTTP_GET_VARS["layer"] return?
> What does the url look like when you use GET ?
>
> Maybe rewrite your select list to PHP, so you can 'make' a url array
> like:
>
> LayerArrayString = "a c"
>
> Would look something like:
>
> <select multiple name="LayerList[]" size="5">
> <OPTION value="A">A</OPTION>
> <OPTION value="B">B</OPTION>
> <OPTION value="C">C</OPTION>
> </select>
>
> Then you can call the LayerList-array using:
>
> $count=count($LayerList);
> for ($i=0; $i<$count; $i++) {
>     echo $LayerList[$i];
>     $LayerArrayString = $LayerArrayString . " " . $LayerList[$i];
> }
>
>
> Erwin
>
>
>
>
> -----Original Message-----
> From: Pushkar Pradhan [mailto:pushkar at ERC.MsState.Edu]
> Sent: Friday, April 05, 2002 8:43 PM
> To: E Perik
> Cc: mapserver-users at lists.gis.umn.edu
> Subject: RE: [mapserver-users] RE: dynamically allocated points for MAP
> w/ PHP
>
> Hi Erwin,
> I wrote code to implement some of the things you suggested. If I use GET
> I
> get all the params. like zoomsize, layers etc. in my address window of
> IE,
> but for POST these params. do not appear in the address window.
> But for both these methods when I print out the vals. of layer field I
> get
> only the last element selected.
> Here is the code I use:
> if ( isset($HTTP_GET_VARS["layer"]) ) {
>    reset($HTTP_GET_VARS);
>    $selectLayers = explode(" ", $HTTP_GET_VARS["layer"]);
>    echo "here";
>    foreach($selectLayers as $val) {
>       echo "$val ";
>    }
> }   // end of if loop
> same goes if I try POST.
> My html:
>       <b>Select Layers to Display: </b><br>
>       <select multiple name="layer" size=5>
>       <option value="a">a
>       <option value="b">b
>       <option value="c">c
>       <option value="d">d
>       <option value="e">e
>
>       <!-- comment php code for now
>       <?php
>       foreach($layerNames as $layerName) {
>       switch($layerName) {
>          case 'six_cnty':
>             break;
>          case '6cnty_quad':
>             break;
>          default:
>             printf("<option value=$layerName> $layerName");
>          }
>       }
>       ?>
>       -->
>       </select>
> If anybody knows what's wrong?
> > Hi Pushkar, >
> > Just to check the obvious,....
> >
> > 1) Does it echo the layername?
> > 2) Should you not use 'explode' for $layer when multiple are selected?
> > 3) Is the layername an existing one and not too long?
> > 4) Is the layer STATUS set to: DEFAULT or ON ?
> > 5) Is the layer set in your url like:
> >    http://localhost/.../name.php?zoom=1&layer="layer1 layer2 layer3"
> > 6) You sure POST is correct? Did you check GET ?
> >
> > Option 2) should use a string like "layer1 layer2 layer3" (see option
> 5)
> > and then you explode it using the space so you then use $layer[0] for
> > your first layer of the 'original-string-array'
> >
> > For exploding use something like:
> >
> > $LayerArray = explode(" ", $HTTP_GET_VARS["layer"]);
> >
> > Then from the example above you get:
> >
> > $LayerArray[0] would be "layer1"
> > $LayerArray[1] would be "layer2"
> > $LayerArray[2] would be "layer3"
> >
> > Erwin
> >
> >
> > -----Original Message-----
> > From: owner-mapserver-users at lists.gis.umn.edu
> > [mailto:owner-mapserver-users at lists.gis.umn.edu] On Behalf Of Pushkar
> > Pradhan
> > Sent: Thursday, April 04, 2002 7:56 PM
> > To: mapserver-users at lists.gis.umn.edu
> > Subject: Re: [mapserver-users] RE: dynamically allocated points for
> MAP
> > w/ PHP
> >
> > I have a related question, in php/mapscript I show the user a html
> list
> > from which he/she can select layers to add to the current view, I am
> > writing some code but it doesn't work can somebody provide me with the
> > algorithm if not the code like the one given below:
> > if ( isset($HTTP_POST_VARS["layer"]) ) {
> >    echo $HTTP_POST_VARS["layer"];
> >    $layer = $map->getLayerByName($HTTP_POST_VARS["layer"]);
> >    $image = $map->prepareImage();
> >    $layer->draw($image);
> >    $image_url = $image->saveWebImage(MS_PNG,1,1,0);
> > }   // end of if loop
> > The above code doesn't work it creates a blank image, moreover if one
> > selects multiple layers to display then only the last one selected is
> > chosen.
> > Thanks,
> >
> > > Hi Scott, >
> > > There is nothing wrong with the PHP code, except it does not create
> a
> > > layer, but it creates a new shapefile ;-)
> > >
> > > So you want to create a layer, dynamicly, or .....
> > >
> > > Example of creating a layer from a shapefile:
> > >
> > > 0) Create map-object
> > > 1) Get object/points from existing-shapefile or from database
> > > 2) Put it in new-shapefile (as you did in your php-script)
> > > 3) Create dbf-file with name of new-shapefile
> > > 4) Clear new-shapefile (as you did)
> > > 5) Add new-layer to map-object (default of this layer is set to OFF)
> > > 6) Show new-layer (turn it ON)
> > > 7) Draw the map (now includes newly created shapefile ;-) )
> > >
> > > Explanation:
> > >
> > > *** In 0) you use like: $Map = ms_newMapObj("blabla.map");
> > >
> > > *** In 1) you determine input. This could be the 3 points you have
> in
> > > your example, but also could be a shape or lat/lon from a database
> > (eg.
> > > dbf/MySQL)
> > >
> > > *** Option 2) and 3) and 4) you have in your mapscript. This creates
> a
> > > shapefile + corresponding dbf-file.
> > >
> > > *** Option 5) and 6) is best done using a dummy-layer which is set
> to
> > > OFF in your map-file. You turn it on AND attach the new
> shapefile-data
> > > from by using:
> > > 	$Dummylayer = ms_newLayerObj($Map);  // a new layerobject
> > > 	$Dummylayer = $Map->getLayerByName("MapLayer");
> > > 	$Dummylayer->set("status", 1);	       // Turn it on
> > > 	$Dummylayer->set("data", $shpFname);       // Add your created
> > > data
> > >
> > > 	While your map-layer looks something like:
> > >
> > > 	LAYER
> > > 	  NAME "MapLayer"
> > > 	  TYPE POINT
> > > 	  STATUS OFF
> > > 	  CLASS
> > > 	    SYMBOL 'circle'
> > > 	    COLOR 0 0 0
> > > 	    SIZE 3
> > > 	  END
> > > 	END
> > >
> > > *** Option 7) is something like:
> > >
> > > $ImgMap = $Map->draw();
> > >
> > > This should do the trick.
> > >
> > > Erwin
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Scott D Cogan [mailto:cogansco at msu.edu]
> > > Sent: Wednesday, April 03, 2002 10:28 PM
> > > To: Consult IT!, E. Perik; mapserver-users at lists.gis.umn.edu
> > > Subject: dynamically allocated points for MAP w/ PHP
> > >
> > > what is wrong with this PHP code?  i am trying to create a layer of
> > > points
> > > using mapscript.  i had this working previously, then somehow
> deleted
> > > the
> > > file.  now i cant figure it out again:
> > >
> > > if ($init==1) {
> > > // recreate the site layer
> > >   $shpFname = "C:\\Program
> > Files\\Apache\\htdocs\\mich\\data\\shptest";
> > >   $shpFile = ms_newShapeFileObj($shpFname, MS_SHP_POINT);
> > >   $def =  array(array("PROG_ID", "N", 5, 0));
> > >   $dbfFile = dbase_create($shpFname . ".dbf", $def);
> > >   createPoint( 14, 34, 111);
> > >   createPoint( 33, 14, 222);
> > >   createPoint( 10, 20, 333);
> > > // done... cleanup
> > >   $shpFile->free();
> > >   dbase_close($dbfFile);
> > > }
> > >
> > >
> > > function createPoint($x, $y, $name){
> > >     GLOBAL $shpFile, $dbfFile;
> > >     // Create shape
> > >     $oShp = ms_newShapeObj(MS_SHP_POINT);
> > >     $oLine = ms_newLineObj();
> > >     $oLine->addXY($x, $y);
> > >     $oShp->add( $oLine );
> > >     $shpFile->addShape($oShp);
> > >     // Write attribute record
> > >     dbase_add_record($dbfFile, array($name));
> > > }
> > >
> >
> >
> ------------------------------------------------------------------------
> > ------
> > PUSHKAR S. PRADHAN
> > Research Assistant
> > MISSISSIPPI STATE UNIVERSITY,
> > STARKVILLE, MS 39759.
> >
> > Engineering Research Center
> > Box 9627
> > Mississippi State, MS 39762-9627
> >
> ------------------------------------------------------------------------
> > ------
> >
>
> ------------------------------------------------------------------------
> ------
> PUSHKAR S. PRADHAN
> Research Assistant
> MISSISSIPPI STATE UNIVERSITY,
> STARKVILLE, MS 39759.
>
> Engineering Research Center
> Box 9627
> Mississippi State, MS 39762-9627
> ------------------------------------------------------------------------
> ------
>

------------------------------------------------------------------------------
PUSHKAR S. PRADHAN
Research Assistant
MISSISSIPPI STATE UNIVERSITY,
STARKVILLE, MS 39759.

Engineering Research Center
Box 9627
Mississippi State, MS 39762-9627
------------------------------------------------------------------------------