Adding a dark mode toggle to vuetify app v2.0 on nuxt.js

Question

I am using nuxt.js vuetify template, nuxt.config.js already has a object (mentioned below) which defines dark mode for the app.

  vuetify: {
    customVariables: ['~/assets/variables.scss'],
    theme: {
      dark: true,
      themes: {
        dark: {
          primary: colors.blue.darken2,
          accent: colors.grey.darken3,
          secondary: colors.amber.darken3,
          info: colors.teal.lighten1,
          warning: colors.amber.base,
          error: colors.deepOrange.accent4,
          success: colors.green.accent3
        }
      }
    }
  },

How do I add this as a feature, as a button to toggle from light version to dark? Vuetify has documentation for theme customization, but no proper way which explains how to do this within the app.

Answer 1

You could do the following on a v-btn to manipulate $vuetify.theme.dark.

<v-btn @click="$vuetify.theme.dark=!$vuetify.theme.dark">Toggle Theme</v-btn>

This will toggle between the light and dark theme. The setting is described at the title "Light and Dark" in the documentation, though I admit it is easy to miss.

Edit: Save state in localStorage

Create a method and call it @click.

toggleTheme() {
   this.$vuetify.theme.dark=!this.$vuetify.theme.dark;
   localStorage.setItem("useDarkTheme", this.$vuetify.theme.dark.toString())
}

and on mounted you could then load that state

mounted() {
  const theme = localStorage.getItem("useDarkTheme");
    if (theme) {
      if (theme == "true") {
        this.$vuetify.theme.dark = true;
      } else this.$vuetify.theme.dark = false;
    }
}

Answer 2

I just fixed it my self. Go to nuxt.config and add this code.

buildModules: [
    [
      "@nuxtjs/vuetify",
      {
        treeShake: true,
        theme: {
          dark: true,
        }
      }
    ]
  ],

Answer 3

Nice and fastest way I found to add a switch button for dark/light mode:

<v-btn
  icon
  :color="$vuetify.theme.dark ? 'yellow' : 'dark'"
  @click="$vuetify.theme.dark = !$vuetify.theme.dark"
>

Nothing else needed.