Made Tile.Image.IFrame an addin which will be used only if a layer is configured with the maxGetUrlLength option. This deprecates Layer.WMS.Post. r=tschaub (closes #2824)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10755 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/wms-long-url.js

@@ -0,0 +1,19 @@
+// a long text that we set as dummy param (makeTheUrlLong) to make the url long
+var longText = new Array(205).join("1234567890");
+
+var map = new OpenLayers.Map( 'map' );
+var layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
+        "http://vmap0.tiles.osgeo.org/wms/vmap0",
+        {layers: 'basic', makeTheUrlLong: longText},
+        {tileOptions: {maxGetUrlLength: 2048}}
+);
+map.addLayer(layer);
+map.zoomToMaxExtent();
+
+// add behavior to dom elements
+document.getElementById("longurl").onclick = function() {
+    layer.mergeNewParams({makeTheUrlLong: longText})
+}
+document.getElementById("shorturl").onclick = function() {
+    layer.mergeNewParams({makeTheUrlLong: null})
+}