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example.html
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example.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Example UI with vanilla JS </title>
</head>
<body>
<div></div>
<h1>Todo List</h1>
<input id="todo" type="text" placeholder="Add Todo"/>
<button id="todoBtn">Add Todo</button>
<ul id="todos">
</ul>
<div>
<h1>Goals</h1>
<input id="goal" type="text" placeholder="Add Goal"/>
<button id="goalBtn">Add Goal</button>
<ul id="goals">
</ul>
</div>
<script type="text/javascript">
//Library code
function createStore (reducer) {
// the store shuld have four parts
// 1. Hold the state
// 2. Get the State
// 3. Listen to changes on the state
// 4. Update the state
let state
let listeners = []
const getState = () => state
const subscribe = (callbackFunc) => {
listeners.push(callbackFunc)
return () => {
listeners = listeners.filter((cb) => cb !== callbackFunc )
}
}
const dispatch = (action) => {
state = reducer(state, action)
listeners.forEach((listener) => listener())
}
return {
getState,
subscribe,
dispatch
}
}
// App code
function generateId () {
return Math.random().toString(36).substring(2) + (new Date().getTime().toString(36));
}
// App action types
const ADD_TODO = 'ADD_TODO';
const REMOVE_TODO = 'REMOVE_TODO';
const TOGGLE_TODO = 'TOGGLE_TODO';
const ADD_GOAL = 'ADD_GOAL';
const REMOVE_GOAL = 'REMOVE_GOAL';
const TOGGLE_GOAL = 'TOGGLE_GOAL';
// action creators
function addTodoAction (todo) {
return {
type: ADD_TODO,
todo
}
}
function removeTodoAction (id) {
return {
type: REMOVE_TODO,
id
}
}
function toggleTodoAction (id) {
return {
type: TOGGLE_TODO,
id
}
}
function addGoalAction (goal) {
return {
type: ADD_GOAL,
goal
}
}
function removeGoalAction (id) {
return {
type: REMOVE_GOAL,
id
}
}
function toggleGoalAction (id) {
return {
type: TOGGLE_GOAL,
id
}
}
// action creators
// This is the pure function that will return new states
// It takes in two args: the current sate and an action
// It is a reducer
function todos (state = [], action) {
switch (action.type) {
case ADD_TODO:
// Array.concat returns a new array
return state.concat([action.todo])
case REMOVE_TODO:
// Array.filter returns a new array
return state.filter((todo) => todo.id !== action.id)
case TOGGLE_TODO:
// Array.map returns a new array
return state.map(
(todo) => todo.id !== action.id ? todo: Object.assign({}, todo, {complete: !todo.complete})
)
default:
return state
}
}
// It is another reducer
function goals (state = [], action) {
switch (action.type) {
case ADD_GOAL:
// Array.concat returns a new array
return state.concat([action.goal])
case REMOVE_GOAL:
// Array.filter returns a new array
return state.filter((goal) => goal.id !== action.id)
case TOGGLE_GOAL:
// Array.map returns a new array
return state.map(
(goal) => goal.id !== action.id ? goal: Object.assign({}, goal, {complete: !goal.complete})
)
default:
return state
}
}
// the root reducer
// The same as Redux.combineReducers({todos, goals})
function app (state = {}, action) {
return {
todos: todos(state.todos, action),
goals: goals(state.goals, action)
}
}
//instantiate a new store
const store = createStore(app)
//add a listener to listen for changes
store.subscribe(()=>{
const { goals, todos } = store.getState()
document.getElementById('todos').innerHTML = ''
document.getElementById('goals').innerHTML = ''
todos.forEach(addTodoToDOM)
goals.forEach(addGoalToDOM)
console.log('The new state is: ', store.getState())
})
//DOM CODE
function addTodo () {
const input = document.getElementById('todo')
const name = input.value
//reset
input.value = ''
store.dispatch(addTodoAction({
id: generateId(),
name,
complete: false
}))
}
function addGoal () {
const input = document.getElementById('goal');
const name = input.value;
//reset
input.value = ''
store.dispatch(addGoalAction({
id: generateId(),
name,
complete: false
}))
}
// listen for button clicks
document.getElementById('todoBtn').addEventListener('click', addTodo)
document.getElementById('goalBtn').addEventListener('click', addGoal)
function createRemoveButton (onClick) {
const removeBtn = document.createElement('button')
removeBtn.innerHTML = 'X'
removeBtn.addEventListener('click', onClick)
return removeBtn
}
function addTodoToDOM (todo) {
const todoListItemNode = document.createElement('li')
const todoText = document.createTextNode(todo.name)
const removeBtn = createRemoveButton(() => {
store.dispatch(removeTodoAction(todo.id))
})
todoListItemNode.appendChild(todoText)
todoListItemNode.appendChild(removeBtn)
todoListItemNode.style.textDecoration = todo.complete ? 'line-through' : 'none'
todoListItemNode.addEventListener('click', () => {
store.dispatch(toggleTodoAction(todo.id))
})
document.getElementById('todos')
.appendChild(todoListItemNode)
}
function addGoalToDOM (goal) {
const goalListItemNode = document.createElement('li')
const goalText = document.createTextNode(goal.name)
const removeBtn = createRemoveButton(() => {
store.dispatch(removeGoalAction(goal.id))
})
goalListItemNode.appendChild(goalText)
goalListItemNode.appendChild(removeBtn)
goalListItemNode.style.textDecoration = goal.complete ? 'line-through' : 'none'
goalListItemNode.addEventListener('click', () => {
store.dispatch(toggleGoalAction(goal.id))
})
document.getElementById('goals')
.appendChild(goalListItemNode)
}
</script>
</body>
</html>