[mapguide-users] Layer properties problem

padmini godavarthi godavarthi.padmini at gmail.com
Wed Apr 7 03:29:57 EDT 2010 

Hi,
iam doing zoom to feature (i mean if i select layername from dropdownlist
the layer properties have to appear in 2nd dropdownlist.when i select one of
layer property the propertyvalues have to display in 3rd
dropdownlist)partially i succeeded.but iam unable to get the selected value
of layer property.because iam new to php 
in .net i will write as dropdownlist.selecteditem(if i select featId then it
will come),But how to retrieve this value in php.
my code is as follows




<?php

	require_once '../utilityfunctions.php';
    require_once '../JSON.php';
	require_once 'classes/zoom.php';

	$args = ($_SERVER['REQUEST_METHOD'] == "POST") ? $_POST : $_GET;

	$errorMsg = null;
	$errorDetail = null;

	try
	{
		MgInitializeWebTier($configFilePath);

		$query = new Query($args);

		$layerNames = $query->GetMapLayerNames();
	}
	catch (MgException $mge)
	{
		$errorMsg = $mge->GetMessage();
		$errorDetail = $mge->GetDetails();
		echo $errorMsg;
		echo $errorDetail;
	}
	catch (Exception $e)
	{
		$errorMsg = $e->GetMessage();
		echo $errorMsg;
	}
?>
<html>
<head>
	<title>Query Features</title>
    <link rel="stylesheet" href="../styles/gt.css" type="text/css">
	<script language="javascript"
src="../../viewerfiles/browserdetect.js"></script>
	<script language="javascript" src="../json.js"></script>

	<script language="javascript">
		var READY_STATE_UNINITIALIZED 	= 0;
		var READY_STATE_LOADING 		= 1;
		var READY_STATE_LOADED 			= 2;
		var READY_STATE_INTERACTIVE 	= 3;
		var READY_STATE_COMPLETE 		= 4;

		var NOT_BUSY_IMAGE = "../images/loader_inactive.gif";
		var BUSY_IMAGE = "../images/loader_pulse.gif";

        var session = '<?= $args['SESSION'] ?>';
        var mapName = 'map';


		var queryReqHandler = null;

		var properties = null;
		var propertyvalues=null;
		var results;

		function OnLayerChange()
				{
		            var layerSelect = document.getElementById("layerSelect");
		            var propertySelect =
document.getElementById("propertySelect");
		            var valueSelect = document.getElementById("valueSelect");

		            reqParams = "COMMAND=GETLAYERPROPERTIES";
					reqParams += "&SESSION=" + encodeURIComponent(session);
		            reqParams += "&MAPNAME=" + encodeURIComponent(mapName);
					reqParams += "&LAYERNAME=" + encodeURIComponent(layerSelect.value);

		            if (msie)
		                reqHandler = new ActiveXObject("Microsoft.XMLHTTP");
		            else
		                reqHandler = new XMLHttpRequest();

		            reqHandler.open("POST", "zoomcontroller.php", false);
		           
reqHandler.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

					reqHandler.send(reqParams);
					alert(reqParams);
					properties = reqHandler.responseText.parseJSON();

					propertySelect.options.length = 0;

					for (var i = 0; i < properties.length; i++)
					{
						propertySelect.options[i] = new Option(properties[i].name, i, false,
false);

					}
					OnPropertyChange();
		}
		function OnPropertyChange()
		{
            var propertySelect = document.getElementById("propertySelect");
            var valueSelect = document.getElementById("valueSelect");

			if (propertySelect.selectedIndex > 0)
			{


       alert(propertySelect.value); [it comes as  the index value]



            reqParams = "COMMAND=GETLAYERPROPERTYVALUES";
			reqParams += "&SESSION=" + encodeURIComponent(session);
            reqParams += "&MAPNAME=" + encodeURIComponent(mapName);
			reqParams += "&LAYERNAME=" + encodeURIComponent(layerSelect.value);
			reqParams += "&PROPNAME=" + encodeURIComponent("FeatId");
alert(reqParams);
            if (msie)
                reqHandler = new ActiveXObject("Microsoft.XMLHTTP");
            else
                reqHandler = new XMLHttpRequest();

            reqHandler.open("POST", "zoomcontroller.php", false);
           
reqHandler.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

			reqHandler.send(reqParams);
alert(reqHandler.responseText);
            propertyvalues=reqHandler.responseText.parseJSON();

			valueSelect.options.length = 0;

         for (var i = 0; i < propertyvalues.length; i++)
			{

				valueSelect.options[i] = new Option(propertyvalues[i], i, false, false);

			}

			}

		}


function OnReadyStateChange()
		{

		alert("readyState");
			var ready = reqHandler.readyState;

			if (ready == READY_STATE_COMPLETE)
			{
			alert(reqHandler.responseText);
				results = reqHandler.responseText.parseJSON();

				OnResultChange();



			}
		}

		function OnResultChange()
		{

			var zoomBtn = document.getElementById("zoomBtn");
			var selectBtn = document.getElementById("selectBtn");

			if (valueSelect.selectedIndex >= 0)
			{

				zoomBtn.disabled = false;

			}
			else
			{

				zoomBtn.disabled = false;

			}
		}

		function OnLoad()
		{
			OnLayerChange();
    OnResultChange()
		}




function ZoomToFeature()
{

 var propertySelect = document.getElementById("propertySelect");
  var valueSelect = document.getElementById("valueSelect");

var query=	 "FeatId" + "=" + valueSelect.Value;
                          alert(query);

  reqParams = "COMMAND=ZOOMTOFEATURE";
reqParams += "&SESSION=" + encodeURIComponent(session);
 reqParams += "&MAPNAME=" + encodeURIComponent(mapName);
reqParams += "&LAYERNAME=" + encodeURIComponent(layerSelect.value);
reqParams += "&QUERY=" + encodeURIComponent(query);

  if (msie)
 reqHandler = new ActiveXObject("Microsoft.XMLHTTP");
else
reqHandler = new XMLHttpRequest();
 reqHandler.onreadystatechange = OnReadyStateChange;
 reqHandler.open("POST", "zoomcontroller.php", false);

reqHandler.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

reqHandler.send(reqParams);

feature = results[0];

SelectFeature();
parent.parent.mapFrame.ZoomToView(feature.centerX, feature.centerY,3000,
true);
				}

		function SelectFeature()
		{
      alert("iamselectfeature");

            reqParams = "COMMAND=GETSELECTIONXML";
			reqParams += "&SESSION=" + encodeURIComponent(session);
            reqParams += "&MAPNAME=" + encodeURIComponent(mapName);
			reqParams += "&LAYERNAME=" + encodeURIComponent(layerSelect.value);
			reqParams += "&IDLIST=" + results[0].idList.toJSONString();

            if (msie)
                reqHandler = new ActiveXObject("Microsoft.XMLHTTP");
            else
                reqHandler = new XMLHttpRequest();

            reqHandler.open("POST", "zoomcontroller.php", false);
            reqHandler.setRequestHeader("Content-Type",
"application/x-www-form-urlencoded");
			reqHandler.send(reqParams);
			alert("iaminselectfeature");
			alert(reqHandler.responseText);
			selectionXml = reqHandler.responseText;

           
parent.parent.mapFrame.SetSelectionXML(TrimString(selectionXml));
        }
 function TrimString(responseString)
        {
            responseString = responseString.replace( /^\s+/g, "" );
            return responseString.replace( /\s+$/g, "" );
        }

	</script>

</head>

<body onLoad="OnLoad();"  marginwidth=5 marginheight=5 leftmargin=5
topmargin=5 bottommargin=5 rightmargin=5>

<?php if ($errorMsg == null) { ?>

<table class="RegText" border="0" cellspacing="0" width="100%">
	<tr><td class="Title"> ../images/loader_inactive.gif &nbsp;Zoom
Features<hr></td></tr>
	<tr><td class="SubTitle">Select a Layer</td></tr>
    <tr><td>Layer:</td></tr>
	<tr>
<td class="RegText">
<select size="1" class="Ctrl" id="layerSelect" onChange="OnLayerChange()"
style="width: 100%">
<?php
$selected = 'selected';
foreach($layerNames as $layerName => $layerLabel)
 {
<option value="<?= $layerName ?>" <?=$selected ?> ><?= $layerLabel
?></option>
				
<?php
$selected = '';
}
?>
</select>
</td>
</tr>

    <tr><td>Property:</td></tr>
	<tr>
<td class="RegText">
<select size="1" class="Ctrl" id="propertySelect"
onChange="OnPropertyChange()" style="width: 100%">

</select>
</td>
</tr>
    <tr><td>Value:</td></tr>
	<tr>
		<td class="RegText">
			<select size="1" class="Ctrl" id="valueSelect" style="width: 100%">
		  	</select>
		</td>
	</tr>

	<tr>
	<td>
<input class="Ctrl" id="zoomBtn" type="button" onClick="ZoomToFeature()"
value="Zoom" style="width:60px">

		</td>
	</tr>

</table>

<?php } else { ?>

<table class="RegText" border="0" cellspacing="0" width="100%%">
	<tr><td class="Title">Error<hr></td></tr>
	<tr><td><?= $errorMsg ?></td></tr>
	<tr><td><?= $errorDetail ?></td></tr>
</table>

<?php } ?>

</body>


1)How to retrieve the selecteditem in Propertyselect dropdownlist


</html>

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