Ensure initial transaction executes in nextTick

SQLitePlugin.coffee.md

@@ -15,6 +15,10 @@ License for common Javascript: MIT or Apache
     READ_ONLY_REGEX = /^\s*(?:drop|delete|insert|update|create)\s/i
     IOS_REGEX = /iP(?:ad|hone|od)/
 
+    nextTick = window.setImmediate || (fun) ->
+      window.setTimeout(fun, 0)
+      return
+
 - SQLitePlugin object is defined by a constructor function and prototype member functions:
 
     SQLitePlugin = (openargs, openSuccess, openError) ->
@@ -59,8 +63,7 @@ License for common Javascript: MIT or Apache
 
     SQLitePlugin::addTransaction = (t) ->
       @txQ.push t
-      if @txQ.length is 1
-        t.start()
+      @.startNextTransaction()
       return
 
     SQLitePlugin::transaction = (fn, error, success) ->
@@ -72,9 +75,12 @@ License for common Javascript: MIT or Apache
       return
 
     SQLitePlugin::startNextTransaction = ->
-      @txQ.shift()
-      if @txQ[0]
-        @txQ[0].start()
+      tx = @
+
+      nextTick () ->
+        if tx.txQ.length > 0
+          tx.txQ.shift().start()
+        return
       return
 
     SQLitePlugin::open = (success, error) ->

test-www/www/index.html

@@ -424,6 +424,23 @@
           });
         });
 
+        test(suiteName + ' test callback order', function () {
+          stop();
+          var db = openDatabase("Database-Callback-Order", "1.0", "Demo", DEFAULT_SIZE);
+          var blocked = true;
+
+          db.transaction(function(tx) {
+            ok(!blocked, 'callback to the transaction shouldn\'t block (1)');
+            tx.executeSql('SELECT 1 from sqlite_master', [], function () {
+              ok(!blocked, 'callback to the transaction shouldn\'t block (2)');
+            });
+          }, function(err) { ok(false, err.message) }, function() {
+            start();
+            ok(!blocked, 'callback to the transaction shouldn\'t block (3)');
+          });
+          blocked = false;
+        });
+
         /**
          test(suiteName + "PRAGMA & multiple databases", function() {
           var db = openDatabase("DB1", "1.0", "Demo", DEFAULT_SIZE);