Add vue component for save button and integrate into FormMixin

js/mixins/form.js

@@ -1,3 +1,5 @@
+import savebutton from '../components/save_button'
+
 export default {
   mounted: function() {
     this.$root.$on('field-change', this.handleFieldChange)
@@ -8,7 +10,25 @@ export default {
       const { value, name } = event
       if (typeof this[name] !== undefined) {
         this[name] = value
+        this.disabled = false
       }
     },
   },
+
+  data: function() {
+    return {
+      disabled: this.disableSave,
+    }
+  },
+
+  props: {
+    disableSave: {
+      type: Boolean,
+      default: true,
+    },
+  },
+
+  components: {
+    savebutton,
+  },
 }