add keyboard support for mass inputs

static/js/utils/massInput.js

@@ -49,14 +49,13 @@
 
       // setup submit buttons inside this massinput so browser
       // uses correct submit button for form submission.
-      // contents of the massinput will be replaced either way,
-      // so unarming is no problem
       var buttons = getMassInputSubmitButtons();
       buttons.forEach(function(button) {
         setupSubmitButton(button);
       });
 
       massInputForm.addEventListener('submit', massInputFormSubmitHandler);
+      massInputForm.addEventListener('keypress', keypressHandler);
 
       // mark initialized
       element.classList.add(MASS_INPUT_INITIALIZED_CLASS);
@@ -88,12 +87,8 @@
         var activeElement;
 
         // check if event occured from either a mass input add/delete button or
-        // from inside one of massinput's inputs (i.e. they are focused/active)
-        if (event.type === 'click') {
-          activeElement = event.target;
-        } else {
-          activeElement = element.querySelector(':focus, :active');
-        }
+        // from inside one of massinput's inputs (i.e. a child is focused/active)
+        activeElement = element.querySelector(':focus, :active');
 
         if (!activeElement) {
           return false;
@@ -140,6 +135,16 @@
       };
     }
 
+    function keypressHandler(event) {
+      if (event.keyCode !== 13) {
+        return false;
+      }
+
+      if (massInputFormSubmitHandler) {
+        return massInputFormSubmitHandler(event);
+      }
+    }
+
     function getMassInputSubmitButtons() {
       return Array.from(element.querySelectorAll('button[type="submit"][name][value], .' + MASS_INPUT_SUBMIT_BUTTON_CLASS));
     }
@@ -208,6 +213,7 @@
     function reset() {
       element.classList.remove(MASS_INPUT_INITIALIZED_CLASS);
       massInputForm.removeEventListener('submit', massInputFormSubmitHandler)
+      massInputForm.removeEventListener('keypress', keypressHandler);
 
       var buttons = getMassInputSubmitButtons();
       buttons.forEach(function(button) {