Add argument to callback

1 files changed, 9 insertions, 4 deletions

diff --git a/src/lib/binaryXHR.js b/src/lib/binaryXHR.js
index dd0f91b..d91ad72 100644
--- a/src/lib/binaryXHR.js
+++ b/src/lib/binaryXHR.js
@@ -202,9 +202,10 @@ function FetchBinaryURL(url) {
 // ===============================================================

 // Asyncronously load a binary file from the specified URL 

 //

-// callback must be a function with a single argument:

-//  bf = an object of type BinaryFile

-function FetchBinaryURLAsync(url, callback) {

+// callback must be a function with one or two arguments:

+//  - bf = an object of type BinaryFile

+//  - optional argument object (used only if callback_arg not undefined) 

+function FetchBinaryURLAsync(url, callback, callback_arg) {

   var callback_wrapper = function() {

     if(this.readyState == 4) {

       var response=this.responseBody;

@@ -212,7 +213,11 @@ function FetchBinaryURLAsync(url, callback) {
 	response=this.responseText;

       }

       var bf=new BinaryFile(response);

-      callback(bf);

+      if (callback_arg!=null) {

+	callback(bf,callback_arg);

+      } else {

+	callback(bf);

+      }

     }

   }