15 | );
16 | }
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/src/index.css:
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1 | body {
2 | margin: 0;
3 | font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen",
4 | "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue",
5 | sans-serif;
6 | -webkit-font-smoothing: antialiased;
7 | -moz-osx-font-smoothing: grayscale;
8 | }
9 |
10 | code {
11 | font-family: source-code-pro, Menlo, Monaco, Consolas, "Courier New",
12 | monospace;
13 | }
14 |
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/src/index.js:
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1 | import React from 'react';
2 | import ReactDOM from 'react-dom';
3 | import './index.css';
4 | import App from './App';
5 | import * as serviceWorker from './serviceWorker';
6 |
7 | ReactDOM.render(, document.getElementById('root'));
8 |
9 | // If you want your app to work offline and load faster, you can change
10 | // unregister() to register() below. Note this comes with some pitfalls.
11 | // Learn more about service workers: https://bit.ly/CRA-PWA
12 | serviceWorker.unregister();
13 |
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/src/logo.svg:
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1 |
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/src/serviceWorker.js:
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1 | // This optional code is used to register a service worker.
2 | // register() is not called by default.
3 |
4 | // This lets the app load faster on subsequent visits in production, and gives
5 | // it offline capabilities. However, it also means that developers (and users)
6 | // will only see deployed updates on subsequent visits to a page, after all the
7 | // existing tabs open on the page have been closed, since previously cached
8 | // resources are updated in the background.
9 |
10 | // To learn more about the benefits of this model and instructions on how to
11 | // opt-in, read https://bit.ly/CRA-PWA
12 |
13 | const isLocalhost = Boolean(
14 | window.location.hostname === 'localhost' ||
15 | // [::1] is the IPv6 localhost address.
16 | window.location.hostname === '[::1]' ||
17 | // 127.0.0.1/8 is considered localhost for IPv4.
18 | window.location.hostname.match(
19 | /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
20 | )
21 | );
22 |
23 | export function register(config) {
24 | if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
25 | // The URL constructor is available in all browsers that support SW.
26 | const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
27 | if (publicUrl.origin !== window.location.origin) {
28 | // Our service worker won't work if PUBLIC_URL is on a different origin
29 | // from what our page is served on. This might happen if a CDN is used to
30 | // serve assets; see https://github.com/facebook/create-react-app/issues/2374
31 | return;
32 | }
33 |
34 | window.addEventListener('load', () => {
35 | const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
36 |
37 | if (isLocalhost) {
38 | // This is running on localhost. Let's check if a service worker still exists or not.
39 | checkValidServiceWorker(swUrl, config);
40 |
41 | // Add some additional logging to localhost, pointing developers to the
42 | // service worker/PWA documentation.
43 | navigator.serviceWorker.ready.then(() => {
44 | console.log(
45 | 'This web app is being served cache-first by a service ' +
46 | 'worker. To learn more, visit https://bit.ly/CRA-PWA'
47 | );
48 | });
49 | } else {
50 | // Is not localhost. Just register service worker
51 | registerValidSW(swUrl, config);
52 | }
53 | });
54 | }
55 | }
56 |
57 | function registerValidSW(swUrl, config) {
58 | navigator.serviceWorker
59 | .register(swUrl)
60 | .then(registration => {
61 | registration.onupdatefound = () => {
62 | const installingWorker = registration.installing;
63 | if (installingWorker == null) {
64 | return;
65 | }
66 | installingWorker.onstatechange = () => {
67 | if (installingWorker.state === 'installed') {
68 | if (navigator.serviceWorker.controller) {
69 | // At this point, the updated precached content has been fetched,
70 | // but the previous service worker will still serve the older
71 | // content until all client tabs are closed.
72 | console.log(
73 | 'New content is available and will be used when all ' +
74 | 'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
75 | );
76 |
77 | // Execute callback
78 | if (config && config.onUpdate) {
79 | config.onUpdate(registration);
80 | }
81 | } else {
82 | // At this point, everything has been precached.
83 | // It's the perfect time to display a
84 | // "Content is cached for offline use." message.
85 | console.log('Content is cached for offline use.');
86 |
87 | // Execute callback
88 | if (config && config.onSuccess) {
89 | config.onSuccess(registration);
90 | }
91 | }
92 | }
93 | };
94 | };
95 | })
96 | .catch(error => {
97 | console.error('Error during service worker registration:', error);
98 | });
99 | }
100 |
101 | function checkValidServiceWorker(swUrl, config) {
102 | // Check if the service worker can be found. If it can't reload the page.
103 | fetch(swUrl)
104 | .then(response => {
105 | // Ensure service worker exists, and that we really are getting a JS file.
106 | const contentType = response.headers.get('content-type');
107 | if (
108 | response.status === 404 ||
109 | (contentType != null && contentType.indexOf('javascript') === -1)
110 | ) {
111 | // No service worker found. Probably a different app. Reload the page.
112 | navigator.serviceWorker.ready.then(registration => {
113 | registration.unregister().then(() => {
114 | window.location.reload();
115 | });
116 | });
117 | } else {
118 | // Service worker found. Proceed as normal.
119 | registerValidSW(swUrl, config);
120 | }
121 | })
122 | .catch(() => {
123 | console.log(
124 | 'No internet connection found. App is running in offline mode.'
125 | );
126 | });
127 | }
128 |
129 | export function unregister() {
130 | if ('serviceWorker' in navigator) {
131 | navigator.serviceWorker.ready.then(registration => {
132 | registration.unregister();
133 | });
134 | }
135 | }
136 |
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7 | 
22 |
23 |
24 | ## Getting A Collecting of Things
25 |
26 | This is from firebase-hooks, it allows us to query all of the item from the `things` collection in the database in descending order based on the creation data. the `value` will containg the results of the query that we will loop through to render the list items
27 | ```javascript
28 | const [value, loading, error] = useCollection(
29 | firebase
30 | .firestore()
31 | .collection("things")
32 | .orderBy("createdOn", "desc"),
33 | {
34 | snapshotListenOptions: { includeMetadataChanges: true }
35 | }
36 | );
37 | ```
38 | ## Getting a Specific Thing
39 |
40 | We use the firebase-hooks to get a specific object using the id of the object we want to retrieve
41 | ```javascript
42 | // get a document if there is an initial value
43 | const [value, loading, error] = useDocument(
44 | firebase.firestore().doc("things/" + objectId),
45 | {
46 | snapshotListenOptions: { includeMetadataChanges: true }
47 | }
48 | );
49 | ```
50 |
51 | ## Adding Or Updating a Specific Thing
52 |
53 | if editing then we use the firebase-hooks to get the specific object using the
54 | `initialValue` property that is passed to the component
55 | ```javascript
56 | // get a document if there is an initial value
57 | const [value, loading, error] = useDocument(
58 | firebase.firestore().doc("things/" + initialValue),
59 | {
60 | snapshotListenOptions: { includeMetadataChanges: true }
61 | }
62 | );
63 | ```
64 | When saving the thing, determine if it is a new object or an existing object by checking to see if there was an `initialValue` provided as a property. If there was, then we have an object id so we need to update the object and not create a new object
65 | ```javascript
66 | /**
67 | * on save determine if it is a new object or an existing object
68 | * by check to see if there was an initial value provided
69 | */
70 | const onSave = async () => {
71 | let collectionRef = firebase.firestore().collection("things");
72 |
73 | if (initialValue) {
74 | await collectionRef
75 | .doc(initialValue)
76 | .set({ name: thing, updatedOn: new Date().getTime() }, { merge: true });
77 | setThing("");
78 | clear();
79 | } else {
80 | await collectionRef
81 | .doc(initialValue)
82 | .add({ name: thing, createdOn: new Date().getTime() });
83 | setThing("");
84 | clear();
85 | }
86 | };
87 | ```
88 |
89 | ## Deleting A Specific Thing
90 | There is no firebase-hook to delete an object, we just used the firebase javascript api to remove the object
91 | ```javascript
92 | /**
93 | * deletes item from firebase database using the id
94 | * of teh object
95 | *
96 | * @param {*} id
97 | */
98 | const doDelete = id => {
99 | firebase
100 | .firestore()
101 | .collection("things")
102 | .doc(id)
103 | .delete();
104 | };
105 | ```
106 |
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/Screen Shot 2019-09-25 at 1.59.32 AM.png:
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https://raw.githubusercontent.com/aaronksaunders/react-course-firebase-hooks-app/640489afee5cd8897137cb4eae3ded1bff2a6a51/Screen Shot 2019-09-25 at 1.59.32 AM.png
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/package.json:
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1 | {
2 | "name": "fb-hooks",
3 | "version": "0.1.0",
4 | "private": true,
5 | "dependencies": {
6 | "firebase": "^6.6.2",
7 | "react": "^16.9.0",
8 | "react-dom": "^16.9.0",
9 | "react-firebase-hooks": "^2.1.0",
10 | "react-scripts": "3.1.2"
11 | },
12 | "scripts": {
13 | "start": "react-scripts start",
14 | "build": "react-scripts build",
15 | "test": "react-scripts test",
16 | "eject": "react-scripts eject"
17 | },
18 | "eslintConfig": {
19 | "extends": "react-app"
20 | },
21 | "browserslist": {
22 | "production": [
23 | ">0.2%",
24 | "not dead",
25 | "not op_mini all"
26 | ],
27 | "development": [
28 | "last 1 chrome version",
29 | "last 1 firefox version",
30 | "last 1 safari version"
31 | ]
32 | }
33 | }
34 |
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