Show marking message when empty input

resources/assets/js/pages/auth/register.vue

@@ -12,7 +12,7 @@
               <el-input v-model="form.marking" :class="{ 'is-invalid': form.errors.has('marking') }" type="text" name="marking" placeholder="Marking Number">
               </el-input>
               <has-error :form="form" field="marking"/>
-              <span>
+              <span v-if="missingMarking()">
                 * Please contact vendor to get your marking
               </span>
             </div>
@@ -146,6 +146,10 @@ export default {
       } else {
         this.$router.push({ name: 'home' })
       }
+    },
+    missingMarking:function(){
+      console.log(this.form.marking);
+      return this.form.marking === undefined || this.form.marking === '';
     }
   }
 }