Creating a Notifier Component

To enable offline use and access, you need a Notifier component that identifies the mode that is interacting with the app.

First, create a components folder in the src directory to hold the app's components:

    mkdir components

Create a Notifier folder in your src/components directory:

    mkdir Notifier
    cd Notifier
    touch index.js Notifier.css # on Windows, run the following instead
    # copy NUL index.js
    # copy NUL Notifier.css

Next, install a package called classnames for displaying the colors for the various modes, that is, dynamically rendering the classes:

    yarn add classnames # or npm install classnames

Afterwards, edit your Notifier/index.js file to read like this:

    // src/components/Notifier/index.js
    import React, { Component } from "react";
    import "./Notifier.css";
    import classnames from 'classnames';

    class Notifier extends Component {
      render() {
        const notifyclass = classnames('notify', {
          danger: this.props.offline
        });
        const message = this.props.offline ?
      `CloudyCam is offline! Your images will be saved now and then uploaded to your Cloudinary Media Library once your Internet connection is back up.`
      :
      `Take a picture and it will be uploaded to your Cloudinary Media Library.`;
        return (
            <div className={notifyclass}>
                <p>
                    <em>{message}</em>
                </p>
            </div>
        );
      }
    }

    export default Notifier;

Here, check the value of the offline property that is passed when Notifier is called. If offline is true, the app is in offline mode and the class and message are displayed accordingly.

Edit your Notifier/Notifier.css file to read like this:

    /* src/components/Notifier/Notifier.css */

    .notify{
        background-color: #0066B2;
        padding: 20px;
        text-align: center;
        color: white;
        margin-bottom: 20px;
    }

    .danger{
        background-color: #D77623;
    }