apppatch.vue

             <v-btn
                  color="green"
                  x-small
                 <!-- v-show="!$store.state.authUser.avatar" Iam using vuex to show the button when user is having no avatar-->
                   outlined
                  :loading="isSelecting"
                  @click="onButtonClick"
                >
                  <v-icon left>mdi-cloud-upload-outline</v-icon>upload picture
                </v-btn>
                <input
                  type="file"
                  ref="uploader" <!-- using refs to reference it to above button -->
                  class="d-none"
                  accept="image/*"
                  @change="uploadImage($event)"
                  id="file-input"
                />