[Trunk | Library]: string-utils.class.ts: Method 'urlPrefix()' added to return "//" as prefix, when url does not start with protocol (http, https, //).

git-svn-id: https://svn.driver.research-infrastructures.eu/driver/dnet40/modules/uoa-services-library/trunk/ng-openaire-library/src/app@58631 d315682c-612b-4755-9ff5-7f18f6832af3

utils/string-utils.class.ts

@@ -154,6 +154,14 @@ export class Identifier{
   }
 }
 export class StringUtils{
+  public static urlPrefix(url: string): string {
+    if(url.startsWith("http://") || url.startsWith("https://") || url.startsWith("//")) {
+      return "";
+    } else {
+      return "//";
+    }
+  }
+
   public static quote(params: string):string {
       return '"'+params+'"';
   }