Firebase-crud-example on github pages.

Working example: http://voloshins.js.org/firebase-crud-example/

Steps to implement by your own

Create your Github Pages

---

1) Create repo [github_username].github.io.

2) Clone it.

3) Create files index.html main.js main.css.

4) Add minimal markup into index.html.

5) Push to repo.

6) Open https://[github_username].github.io.

7) You have your own website.

Connect Firebase

---

1) Create account at https://firebase.google.com/.

2) Create new project at firebase. ([any_title]).

3) Disable authorization / add github pages domain to list of allowed domains [github_username].github.io.

4) Add firebase script to index.html according to "Add Firebase to your web app".

// index.html
  <script src="https://www.gstatic.com/firebasejs/live/3.0/firebase.js"></script>

//main.js
  // Initialize Firebase
  var config = {
    apiKey: "[api_key]",
    authDomain: "[any_title].firebaseapp.com",
    databaseURL: "https://[any_title].firebaseio.com",
    storageBucket: "[any_title].appspot.com",
  };

  firebase.initializeApp(config);
  var db = firebase.database();

5) Simplest server for development:

  npm i -g http-server
  http-server

Implement CRUD

---

"C" - Сreate

1) Create simple form:

  <h4>CREATE/UPDATE review</h4>
  <form id='reviewForm'>
    <input type="hidden" id='hiddenId' />
    <input type="text" id='fullName' />






    <textarea id='message'></textarea>






    <button type='submit'>Add/Update rewiew</button>
  </form>

2) Add handlers:

var reviewForm = document.getElementById('reviewForm');
var fullName = document.getElementById('fullName');
var message = document.getElementById('message');
var hiddenId = document.getElementById('hiddenId');

reviewForm.addEventListener('submit', (e) => {
  e.preventDefault();
  var id = hiddenId.value || Date.now()

  db.ref('reviews/' + id).set({
    fullName: fullName.value,
    message: message.value
  });

  fullName.value = '';
  message.value = '';
  hiddenId.value = '';
})

3) Check in console if data was created:

curl https://[any_title].firebaseio.com/reviews.json

"R" - Read

1) Add container to render reviews.

  <h4>READ/DELETE reviews</h4>
  <ul id='reviews'></ul>

2) Add listener on firebase event 'child_added'.

var reviews = document.getElementById('reviews');
var reviewsRef = db.ref('/reviews');

reviewsRef.on('child_added', ({val, key}) => {
  var li = document.createElement('li')
  li.id = key;
  li.innerHTML = reviewTemplate(val())
  reviews.appendChild(li);
})

function reviewTemplate({fullName, message}) {
  return `


${fullName}




${message}


  `
}

"U" - Update

1) Add button Edit to template.

function reviewTemplate({fullName, message}) {
  return `


${fullName}




${message}


    <button class='edit'>Edit</button>
  `
}

2) Add handler on button Edit:

reviews.addEventListener('click', (e) => {
  var reviewNode = e.target.parentNode

  // UPDATE REVEIW
  if (e.target.classList.contains('edit')) {
    fullName.value = reviewNode.querySelector('.fullName').innerText;
    message.value  = reviewNode.querySelector('.message').innerText;
    hiddenId.value = reviewNode.id;
  }
})

3) Add listener on firebase event 'child_changed'.

reviewsRef.on('child_changed', (data) => {
  var reviewNode = document.getElementById(data.key);
  reviewNode.innerHTML = reviewTemplate(data.val());
});

"D" - Delete

1) Add button Delete to template.

function reviewTemplate({fullName, message}) {
  return `


${fullName}




${message}


    <button class='edit'>Edit</button>
    <button class='delete'>Delete</button>
  `
}

2) Add handler on button Delete:

  reviews.addEventListener('click', (e) => {
    var reviewNode = e.target.parentNode

    // UPDATE REVEIW
    //...

    // DELETE REVEIW
    if (e.target.classList.contains('delete')) {
      var id = reviewNode.id;
      db.ref('reviews/' + id).remove();
    }
  })

3) Add listener on firebase event 'child_removed'.

  reviewsRef.on('child_removed', (data) => {
    var reviewNode = document.getElementById(data.key);
    reviewNode.parentNode.removeChild(reviewNode);
  });