"Create an urlAppend function that appends strings to urls and handles ? and & appropriately". r=crschmidt (closes #2297)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9730 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Util.js

@@ -628,6 +628,30 @@ OpenLayers.Util.getParameterString = function(params) {
     return paramsArray.join("&");
 };
 
+/**
+ * Function: urlAppend
+ * Appends a parameter string to a url. This function includes the logic for
+ * using the appropriate character (none, & or ?) to append to the url before
+ * appending the param string.
+ * 
+ * Parameters:
+ * url - {String} The url to append to
+ * paramStr - {String} The param string to append
+ * 
+ * Returns:
+ * {String} The new url
+ */
+OpenLayers.Util.urlAppend = function(url, paramStr) {
+    var newUrl = url;
+    if(paramStr) {
+        var parts = (url + " ").split(/[?&]/);
+        newUrl += (parts.pop() === " " ?
+            paramStr :
+            parts.length ? "&" + paramStr : "?" + paramStr);
+    }
+    return newUrl;
+};
+
 /**
  * Property: ImgPath
  * {String} Default is ''.