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To Do List

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学习javascript要看的5个项目：https://www.youtube.com/watch?v=roumzWd4XJU

一、成果：

二、代码
index.html

  <!DOCTYPE html>
<!-- Coding By CodingNepal - youtube.com/codingnepal -->
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Todo App JavaScript | CodingNepal</title>
    <link rel="stylesheet" href="style.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css"/>
</head>
<body>
  <div class="wrapper">
    <header>Todo App</header>
    <div class="inputField">
      <input type="text" placeholder="Add your new todo">
      <button><i class="fas fa-plus"></i></button>
    </div>
    <ul class="todoList">
      <!-- data are comes from local storage -->
    </ul>
    <div class="footer">
      <span>You have <span class="pendingTasks"></span> pending tasks</span>
      <button>Clear All</button>
    </div>
  </div>

  <script src="script.js"></script>

</body>
</html>

index.js

// getting all required elements
const inputBox = document.querySelector(".inputField input");
const addBtn = document.querySelector(".inputField button");
const todoList = document.querySelector(".todoList");
const deleteAllBtn = document.querySelector(".footer button");

// onkeyup event
inputBox.onkeyup = ()=>{
  let userEnteredValue = inputBox.value; //getting user entered value
  if(userEnteredValue.trim() != 0){ //if the user value isn't only spaces
    addBtn.classList.add("active"); //active the add button
  }else{
    addBtn.classList.remove("active"); //unactive the add button
  }
}

showTasks(); //calling showTask function

addBtn.onclick = ()=>{ //when user click on plus icon button
  let userEnteredValue = inputBox.value; //getting input field value
  let getLocalStorageData = localStorage.getItem("New Todo"); //getting localstorage
  if(getLocalStorageData == null){ //if localstorage has no data
    listArray = []; //create a blank array
  }else{
    listArray = JSON.parse(getLocalStorageData);  //transforming json string into a js object
  }
  listArray.push(userEnteredValue); //pushing or adding new value in array
  localStorage.setItem("New Todo", JSON.stringify(listArray)); //transforming js object into a json string
  showTasks(); //calling showTask function
  addBtn.classList.remove("active"); //unactive the add button once the task added
}

function showTasks(){
  let getLocalStorageData = localStorage.getItem("New Todo");
  if(getLocalStorageData == null){
    listArray = [];
  }else{
    listArray = JSON.parse(getLocalStorageData); 
  }
  const pendingTasksNumb = document.querySelector(".pendingTasks");
  pendingTasksNumb.textContent = listArray.length; //passing the array length in pendingtask
  if(listArray.length > 0){ //if array length is greater than 0
    deleteAllBtn.classList.add("active"); //active the delete button
  }else{
    deleteAllBtn.classList.remove("active"); //unactive the delete button
  }
  let newLiTag = "";
  listArray.forEach((element, index) => {
    newLiTag += `<li>${element}<span class="icon" onclick="deleteTask(${index})"><i class="fas fa-trash"></i></span></li>`;
  });
  todoList.innerHTML = newLiTag; //adding new li tag inside ul tag
  inputBox.value = ""; //once task added leave the input field blank
}

// delete task function
function deleteTask(index){
  let getLocalStorageData = localStorage.getItem("New Todo");
  listArray = JSON.parse(getLocalStorageData);
  listArray.splice(index, 1); //delete or remove the li
  localStorage.setItem("New Todo", JSON.stringify(listArray));
  showTasks(); //call the showTasks function
}

// delete all tasks function
deleteAllBtn.onclick = ()=>{
  let getLocalStorageData = localStorage.getItem("New Todo"); //getting localstorage
  if(getLocalStorageData == null){ //if localstorage has no data
    listArray = []; //create a blank array
  }else{
    listArray = JSON.parse(getLocalStorageData);  //transforming json string into a js object
    listArray = []; //create a blank array
  }
  localStorage.setItem("New Todo", JSON.stringify(listArray)); //set the item in localstorage
  showTasks(); //call the showTasks function
}

3.style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
::selection{
  color: #ffff;
  background: rgb(142, 73, 232);
}
body{
  width: 100%;
  height: 100vh;
  /* overflow: hidden; */
  padding: 10px;
  background: linear-gradient(to bottom, #68EACC 0%, #497BE8 100%);
}
.wrapper{
  background: #fff;
  max-width: 400px;
  width: 100%;
  margin: 120px auto;
  padding: 25px;
  border-radius: 5px;
  box-shadow: 0px 10px 15px rgba(0,0,0,0.1);
}
.wrapper header{
  font-size: 30px;
  font-weight: 600;
}
.wrapper .inputField{
  margin: 20px 0;
  width: 100%;
  display: flex;
  height: 45px;
}
.inputField input{
  width: 85%;
  height: 100%;
  outline: none;
  border-radius: 3px;
  border: 1px solid #ccc;
  font-size: 17px;
  padding-left: 15px;
  transition: all 0.3s ease;
}
.inputField input:focus{
  border-color: #8E49E8;
}
.inputField button{
  width: 50px;
  height: 100%;
  border: none;
  color: #fff;
  margin-left: 5px;
  font-size: 21px;
  outline: none;
  background: #8E49E8;
  cursor: pointer;
  border-radius: 3px;
  opacity: 0.6;
  pointer-events: none;
  transition: all 0.3s ease;
}
.inputField button:hover,
.footer button:hover{
  background: #721ce3;
}
.inputField button.active{
  opacity: 1;
  pointer-events: auto;
}
.wrapper .todoList{
  max-height: 250px;
  overflow-y: auto;
}
.todoList li{
  position: relative;
  list-style: none;
  margin-bottom: 8px;
  background: #f2f2f2;
  border-radius: 3px;
  padding: 10px 15px;
  cursor: default;
  overflow: hidden;
  word-wrap: break-word;
}
.todoList li .icon{
  position: absolute;
  right: -45px;
  top: 50%;
  transform: translateY(-50%);
  background: #e74c3c;
  width: 45px;
  text-align: center;
  color: #fff;
  padding: 10px 15px;
  border-radius: 0 3px 3px 0;
  cursor: pointer;
  transition: all 0.2s ease;
}
.todoList li:hover .icon{
  right: 0px;
}
.wrapper .footer{
  display: flex;
  width: 100%;
  margin-top: 20px;
  align-items: center;
  justify-content: space-between;
}
.footer button{
  padding: 6px 10px;
  border-radius: 3px;
  border: none;
  outline: none;
  color: #fff;
  font-weight: 400;
  font-size: 16px;
  margin-left: 5px;
  background: #8E49E8;
  cursor: pointer;
  user-select: none;
  opacity: 0.6;
  pointer-events: none;
  transition: all 0.3s ease;
}
.footer button.active{
  opacity: 1;
  pointer-events: auto;
}

教程：
https://www.youtube.com/watch?v=ykuD2QOZkhc
https://www.codingnepalweb.com/todo-list-app-javascript/

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