fixed max loading pages

public/js/lib/cartodb/models/table.js

@@ -203,24 +203,43 @@
       // options that are use in fetch
       this.linkToSchema();
       this.filter = null;
+      this._fetching = false;
       this.options.bind('change', function() {
+        if(self._fetching) {
+          return;
+        }
+        console.log("=locked " + this.options.get('page'));
+        self._fetching = true;
         opt = {};
+        var previous = this.options.previous('page');
+        console.log('previous ' + previous);
+
         if(this.options.hasChanged('page')) {
           opt.add = true;
           opt.changingPage = true;
           // if user is going backwards insert new rows at the top
-          if(this.options.previous('page') > this.options.get('page')) {
+          if(previous > this.options.get('page')) {
             opt.at = 0;
           }
         }
 
-        opt.success = function() {
-           if(opt.changingPage) {
-             self.trigger('newPage', self.options.get('page'), opt.at === 0? 'up': 'down');
-           }
+        opt.success = function(_coll, resp) {
+          if(resp.rows.length !== 0) {
+            if(opt.changingPage) {
+              self.trigger('newPage', self.options.get('page'), opt.at === 0? 'up': 'down');
+            }
+          } else {
+            // no data so do not change the page
+            self.options.set({page: previous});//, { silent: true });
+            console.log("reverted to " + previous);
+          }
+          console.log(self.options.attributes.page);
+          self._fetching = false;
+        console.log("=unlocked");
         };
         opt.error = function() {
           cdb.log.error("there was some problem fetching rows");
+          self._fetching = false;
         };
         this.fetch(opt);
       }, this);
@@ -260,7 +279,9 @@
     },
 
     setPage: function(p) {
-      if(p >= 0) {
+      console.log("changing page: " + p + " fecth: " + this._fetching);
+      if(!this._fetching && p >= 0) {
+        console.log("changed page: " + p + " now " + this.options.get('page'));
         this.setOptions({page: p});
       }
     },