Adding WKT validation.

Only valid polygons will be imported

src/main/resources/eu/simstadt/regionchooser/website/index.html

@@ -14,7 +14,7 @@
 		-->
 		<script type="text/javascript" src="script/proj4.js"></script>
 		<script type="text/javascript" src="script/jquery-1.4.2.min.js"></script>
-		 <!-- OpenLayers v3.4.0. API doc : http://openlayers.org/en/v3.4.0/apidoc/ --> 
+		 <!-- OpenLayers v3.4.0. API doc : https://geoadmin.github.io/ol3/apidoc/ -->
 		<script src="script/ol.js" type="text/javascript"></script>
 		<link rel="stylesheet" href="style/ol.css" type="text/css" />
 		<script src="script/turf.js" type="text/javascript"></script>

src/main/resources/eu/simstadt/regionchooser/website/script/simstadt_openlayers.js

@@ -301,7 +301,7 @@ const regionChooser = (function(){
 			'<a href="#" onclick="regionChooser.selectAllOrNone(false);">(Select None)</a>\n'+
 			'</div>\n');
 		findIntersections();
-		dataPanel.append('<button type="button" onclick="regionChooser.copyCoordinatesToClipboard()" id="get_wgs84">Copy coordinates</button><br/>\n')
+		dataPanel.append('<button type="button" onclick="regionChooser.copyCoordinatesToClipboard()" id="get_wgs84" style="position:fixed; bottom:0;">Copy coordinates</button><br/>\n')
 	}
 
 	draw.on('drawend', function() {
@@ -375,27 +375,45 @@ const regionChooser = (function(){
 		dataPanel.append("<br>\n");
 		dataPanel.append("More info is available in the ");
 		dataPanel.append("<a href='http://simstadt.hft-stuttgart.de/related-softwares/region-chooser/'>SimStadt documentation</a><br>\n");
-		dataPanel.append("<form id='importWKT'>\n" +
-		"<input id='wktPolygon' type='text' placeholder='WKT Polygon' value='POLYGON ((30 10, 40 40, 20 40, 10 20, 30 10))'></input>\n" +
-		"<input type='submit' value='Import Polygon'></input>\n" +
+		dataPanel.append("<form id='importWKT' style='position:fixed; bottom:0;'>\n" +
+		"<input id='wktPolygon' type='text' placeholder='WKT Polygon' " +
+		"required pattern=' *POLYGON\\(\\([\\-0-9\., ]+\\)\\) *' " +
+		"title='Please input a valid WKT Polygon. Example : POLYGON((9.961675 49.807053, 9.951375 49.798521, 9.969486 49.797746, 9.961675 49.807053)) '/>\n" +
+		"<input type='submit' value='Import Polygon'/>\n" +
 		"</form>\n");
 		document.getElementById('importWKT').addEventListener('submit', importWKT);
 	}
 
 	importWKT = function(e){
+		e.preventDefault(); // to avoid refresh
+
+
 		//TODO: DRY, possibly with other events
 		//TODO: Allow WKT as parameter for GUI?
-
-		console.log("Let's import WKT Polygon : " + wktPolygon);
 		var wktPolygon = document.getElementById("wktPolygon").value;
 
+		console.log("Try to import WKT geometry : " + wktPolygon);
+
 		var wktFormat = new ol.format.WKT();
+
+		try{
 			var feature = wktFormat.readFeature(wktPolygon, {
 				dataProjection : ol.proj.get('EPSG:4326'),
 				featureProjection : ol.proj.get('EPSG:3857')
 			});
+		} catch (e){
+			console.error("Couldn't import geometry!");
+			dataPanel.prepend("<h2 class='error'>Couldn't import geometry!</h2><br/>\n");
+			return false;
+		}
 
-		//TODO: Check if import was succesful
+		// Assuming the linear ring is closed
+		var coordinatesCount = feature.getGeometry().getLinearRing(0).getCoordinates().length - 1;
+
+		if (coordinatesCount < 2){
+			dataPanel.prepend("<h2 class='error'>There should be at least 2 points in WKT polygon</h2><br/>\n");
+			return false;
+		}
 
 		sketch = feature;
 		updateGMLPolygons();
@@ -408,7 +426,7 @@ const regionChooser = (function(){
 		displayInfo();
 		draw.setActive(false);
 
-		e.preventDefault(); // to avoid refresh
+		dataPanel.prepend("<h2 class='ok'>WKT Polygon succesfully imported!</h2><br/>");
 
 	}