Category: Vue Answers

Sometimes, we want to check if Vue.js is in development mode.

In this article, we’ll look at how to check if Vue.js is in development mode.

How to check if Vue.js is in development mode?

To check if Vue.js is in development mode, we can check the value of process.env.NODE_ENV.

For instance, we write

process.env.NODE_ENV === "development";

to check if process.env.NODE_ENV is 'development' to see if the app is running in development mode.

Conclusion

To check if Vue.js is in development mode, we can check the value of process.env.NODE_ENV.

Sometimes, we want to fix the ‘Unknown custom element: v-app – did you register the component correctly?’ error with Vuetify and Vue.js.

In this article, we’ll look at how to fix the ‘Unknown custom element: v-app – did you register the component correctly?’ error with Vuetify and Vue.js.

How to fix the ‘Unknown custom element: v-app – did you register the component correctly?’ error with Vuetify and Vue.js?

To fix the ‘Unknown custom element: v-app – did you register the component correctly?’ error with Vuetify and Vue.js, we should call Vue.use before creating the Vue instance.

For instance, we write

Vue.use(Vuetify);

new Vue({
  el: "#app",
  components: { App },
  template: "<App/>",
});

We call Vue.use with Vuetify to register the Vuetify plugin globally.

And then we create a new Vue instance.

Then we can use v-app in our components.

Conclusion

To fix the ‘Unknown custom element: v-app – did you register the component correctly?’ error with Vuetify and Vue.js, we should call Vue.use before creating the Vue instance.

Sometimes, we want to handle mouse button down event with Vue.js.

In this article, we’ll look at how to handle mouse button down event with Vue.js.

How to handle mouse button down event with Vue.js?

To handle mouse button down event with Vue.js, we can listen to the mousedown event.

For instance, we write

<template>
  <div>
    <button @mousedown="mouseDown">mouse down</button>
  </div>
</template>

to listen to the mousedown event with @mousedown.

We run the mouseDown method when we press down the mouse button when our cursor is on the button.

Conclusion

To handle mouse button down event with Vue.js, we can listen to the mousedown event.

Sometimes, we want to use mask in a Vue.js Vuetify text field.

In this article, we’ll look at how to use mask in a Vue.js Vuetify text field.

How to use mask in a Vue.js Vuetify text field?

To use mask in a Vue.js Vuetify text field, we can use the v-mask package.

To install it, we run

npm install v-mask

Then in main.js, we register the directive globally with

import { VueMaskDirective } from "v-mask";
Vue.directive("mask", VueMaskDirective);

Then we use it with v-text-field by writing

<template>
  <div>
    <v-text-field
      v-mask="'###.###.###-##'"
      :value="currentValue"
      @input="handleInput"
    />
  </div>
</template>

We set v-mask to the mask we want.

Conclusion

To use mask in a Vue.js Vuetify text field, we can use the v-mask package.

Sometimes, we want to import Vue.js components with Webpack.

In this article, we’ll look at how to import Vue.js components with Webpack.

How to import Vue.js components with Webpack?

To import Vue.js components with Webpack, we should register it by putting it into the components property object.

For instance, we write

<template>
  <top-bar></top-bar>
  <div class="message">{{ message }}</div>
</template>

<script>
import TopBar from "./top-bar";

export default {
  components: {
    TopBar,
  },
  data() {
    return {
      message: "Hello World",
    };
  },
};
</script>

to import the TopBar component with

import TopBar from "./top-bar";

Then we register the TopBar component with

components: {
  TopBar,
}

And then we can use it in our template with

<top-bar></top-bar>

Conclusion

To import Vue.js components with Webpack, we should register it by putting it into the components property object.