fix(ionicPopup): if input exists, focus it. else, focus first button

Closes #1176

Author: ajoslin

js/angular/service/popup.js

@@ -321,7 +321,7 @@ function($animate, $ionicTemplateLoader, $ionicBackdrop, $log, $q, $timeout, $ro
           self.element.removeClass('popup-hidden');
           self.element.addClass('popup-showing active');
           ionic.DomUtil.centerElementByMarginTwice(self.element[0]);
-          focusLastButton(self.element);
+          focusInputOrButton(self.element);
         });
       };
       self.hide = function(callback) {
@@ -404,11 +404,14 @@ function($animate, $ionicTemplateLoader, $ionicBackdrop, $log, $q, $timeout, $ro
     return resultPromise;
   }
 
-  function focusLastButton(element) {
-    var buttons = element[0].querySelectorAll('button');
-    var lastButton = buttons[buttons.length-1];
-    if(lastButton) {
-      lastButton.focus();
+  function focusInputOrButton(element) {
+    var inputs = element[0].querySelectorAll('input');
+    if (!inputs.length) {
+      inputs = element[0].querySelectorAll('button');
+    }
+    var last = inputs[inputs.length-1];
+    if(last) {
+      last.focus();
     }
   }