From 9d2a22d7bd0145245a927d6f1a5820cc466032f9 Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Wed, 19 Apr 2017 16:47:02 +0200
Subject: index.html: When rendering WKT input, remove previous WKT input layer

We create a new map layer every time the input textarea is unfocused.
Remove the old data before rendering the new features.
---
 index.html | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/index.html b/index.html
index 0dee871..b1cf9b3 100644
--- a/index.html
+++ b/index.html
@@ -44,7 +44,13 @@
 
 		map.addInteraction(select_click);
 
+		var wkt_layer;
 		input_el.onblur = function(e) {
+			// Remove old WKT layer
+			if (wkt_layer) {
+				map.removeLayer(wkt_layer);
+			}
+
 			var wkt_features = e.target.value.split('\n');
 			wkt_features = wkt_features.map(function(wkt) {
 				return format.readFeature(wkt, {
@@ -53,13 +59,12 @@
 				});
 			});
 
-			map.addLayer(
-				new ol.layer.Vector({
-					source: new ol.source.Vector({
-						features: wkt_features
-					})
+			wkt_layer = new ol.layer.Vector({
+				source: new ol.source.Vector({
+					features: wkt_features
 				})
-			);
+			})
+			map.addLayer(wkt_layer);
 		};
 	</script>
 </body>
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