Change your favicon dynamically based on the user's online or offline status using Vue

I am currently working on setting up different icons to display when my browser is online (normal logo) and offline (greyed out logo). With Vue JS, I am able to detect the online and offline states, as well as set different favicons accordingly. However, the offline icon is not displaying because my browser lacks internet access to fetch the icon.

What would be the most effective method to accomplish this? Here is the code snippet I am currently using, and I am utilizing 'v-offline' to determine online or offline states:


    handleConnectivityChange (status) {
      status ? $('#favicon').attr('href', 'https://snackify-cdn.sfo2.digitaloceanspaces.com/favicon-on.png') : $('#favicon').attr('href', 'https://snackify-cdn.sfo2.digitaloceanspaces.com/favicon-off.png')
    }
javascriptvue.jsvuejs2vue-componentvue-router

Answer №1

When it comes to preloading and dynamically setting favicons, there are two key aspects to consider.

One way to accomplish the first part is through the Vue created method. By utilizing this method, you can display a spinner on the page until the component is mounted. It might be more suitable to implement this functionality as a mixin rather than directly on the component.

data() {
    return {
        favicons: {} // storing images to prevent browser release
    }
},

created () {

    // Logic for creating JS images

    this.favicons = {
        'online': new Image(),
        'offline': new Image()
    };

    // Set source properties for images
    this.favicons.online.src = 'https://snackify-cdn.sfo2.digitaloceanspaces.com/favicon-on.png';
    this.favicons.offline.src = 'https://snackify-cdn.sfo2.digitaloceanspaces.com/favicon-off.png';

}

To update the favicon dynamically, you can use the following approach:

handleConnectivityChange (status) {

    // Get or create the favicon link element
    let link = document.querySelector("link[rel*='icon']") || document.createElement('link');

    // Set attributes for the favicon
    link.type = 'image/x-icon';
    link.rel = 'shortcut icon';
    link.href = status ? this.favicons.online.src : this.favicons.offline.src;

    // Append the favicon to the `head`
    document.getElementsByTagName('head')[0].appendChild(link);
}

Reference: Changing website favicon dynamically

Additionally, I recommend considering dropping jQuery when using Vue. Vanilla JavaScript can often suffice and decrease unnecessary overhead, as demonstrated in this example.

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