How to Make a Notes App using HTML5, CSS3 & JavaScript

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In this tutorial, I will teach you how to create a Notes app using HTML5, CSS3, and JavaScript. The complete source code of this JavaScript Notes app is given below.

HTML5, CSS3, JavaScript Notes App Source Code

index.html

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">  
    <title>Notes App in JavaScript</title>
    <link rel="stylesheet" href="style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- Iconscout Link For Icons -->
    <link rel="stylesheet" href="https://unicons.iconscout.com/release/v4.0.0/css/line.css">
  </head>
  <body>
    <div class="popup-box">
      <div class="popup">
        <div class="content">
          <header>
            <p></p>
            <i class="uil uil-times"></i>
          </header>
          <form action="#">
            <div class="row title">
              <label>Title</label>
              <input type="text" spellcheck="false">
            </div>
            <div class="row description">
              <label>Description</label>
              <textarea spellcheck="false"></textarea>
            </div>
            <button></button>
          </form>
        </div>
      </div>
    </div>
    <div class="wrapper">
      <li class="add-box">
        <div class="icon"><i class="uil uil-plus"></i></div>
        <p>Add new note</p>
      </li>
    </div>

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

script.js

const addBox = document.querySelector(".add-box"),
popupBox = document.querySelector(".popup-box"),
popupTitle = popupBox.querySelector("header p"),
closeIcon = popupBox.querySelector("header i"),
titleTag = popupBox.querySelector("input"),
descTag = popupBox.querySelector("textarea"),
addBtn = popupBox.querySelector("button");

const months = ["January", "February", "March", "April", "May", "June", "July",
              "August", "September", "October", "November", "December"];
const notes = JSON.parse(localStorage.getItem("notes") || "[]");
let isUpdate = false, updateId;

addBox.addEventListener("click", () => {
    popupTitle.innerText = "Add a new Note";
    addBtn.innerText = "Add Note";
    popupBox.classList.add("show");
    document.querySelector("body").style.overflow = "hidden";
    if(window.innerWidth > 660) titleTag.focus();
});

closeIcon.addEventListener("click", () => {
    isUpdate = false;
    titleTag.value = descTag.value = "";
    popupBox.classList.remove("show");
    document.querySelector("body").style.overflow = "auto";
});

function showNotes() {
    if(!notes) return;
    document.querySelectorAll(".note").forEach(li => li.remove());
    notes.forEach((note, id) => {
        let filterDesc = note.description.replaceAll("\n", '<br/>');
        let liTag = `<li class="note">
                        <div class="details">
                            <p>${note.title}</p>
                            <span>${filterDesc}</span>
                        </div>
                        <div class="bottom-content">
                            <span>${note.date}</span>
                            <div class="settings">
                                <i onclick="showMenu(this)" class="uil uil-ellipsis-h"></i>
                                <ul class="menu">
                                    <li onclick="updateNote(${id}, '${note.title}', '${filterDesc}')"><i class="uil uil-pen"></i>Edit</li>
                                    <li onclick="deleteNote(${id})"><i class="uil uil-trash"></i>Delete</li>
                                </ul>
                            </div>
                        </div>
                    </li>`;
        addBox.insertAdjacentHTML("afterend", liTag);
    });
}
showNotes();

function showMenu(elem) {
    elem.parentElement.classList.add("show");
    document.addEventListener("click", e => {
        if(e.target.tagName != "I" || e.target != elem) {
            elem.parentElement.classList.remove("show");
        }
    });
}

function deleteNote(noteId) {
    let confirmDel = confirm("Are you sure you want to delete this note?");
    if(!confirmDel) return;
    notes.splice(noteId, 1);
    localStorage.setItem("notes", JSON.stringify(notes));
    showNotes();
}

function updateNote(noteId, title, filterDesc) {
    let description = filterDesc.replaceAll('<br/>', '\r\n');
    updateId = noteId;
    isUpdate = true;
    addBox.click();
    titleTag.value = title;
    descTag.value = description;
    popupTitle.innerText = "Update a Note";
    addBtn.innerText = "Update Note";
}

addBtn.addEventListener("click", e => {
    e.preventDefault();
    let title = titleTag.value.trim(),
    description = descTag.value.trim();

    if(title || description) {
        let currentDate = new Date(),
        month = months[currentDate.getMonth()],
        day = currentDate.getDate(),
        year = currentDate.getFullYear();

        let noteInfo = {title, description, date: `${month} ${day}, ${year}`}
        if(!isUpdate) {
            notes.push(noteInfo);
        } else {
            isUpdate = false;
            notes[updateId] = noteInfo;
        }
        localStorage.setItem("notes", JSON.stringify(notes));
        showNotes();
        closeIcon.click();
    }
});

style.css

/* Import Google Font - Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:[email protected];500;600;700&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
body{
  background: #88ABFF;
}
::selection{
  color: #fff;
  background: #618cf8;
}
.wrapper{
  margin: 50px;
  display: grid;
  gap: 25px;
  grid-template-columns: repeat(auto-fill, 265px);
}
.wrapper li{
  height: 250px;
  list-style: none;
  border-radius: 5px;
  padding: 15px 20px 20px;
  background: #fff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}
.add-box, .icon, .bottom-content, 
.popup, header, .settings .menu li{
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.add-box{
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
}
.add-box .icon{
  height: 78px;
  width: 78px;
  color: #88ABFF;
  font-size: 40px;
  border-radius: 50%;
  justify-content: center;
  border: 2px dashed #88ABFF;
}
.add-box p{
  color: #88ABFF;
  font-weight: 500;
  margin-top: 20px;
}
.note{
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.note .details{
  max-height: 165px;
  overflow-y: auto;
}
.note .details::-webkit-scrollbar,
.popup textarea::-webkit-scrollbar{
  width: 0;
}
.note .details:hover::-webkit-scrollbar,
.popup textarea:hover::-webkit-scrollbar{
  width: 5px;
}
.note .details:hover::-webkit-scrollbar-track,
.popup textarea:hover::-webkit-scrollbar-track{
  background: #f1f1f1;
  border-radius: 25px;
}
.note .details:hover::-webkit-scrollbar-thumb,
.popup textarea:hover::-webkit-scrollbar-thumb{
  background: #e6e6e6;
  border-radius: 25px;
}
.note p{
  font-size: 22px;
  font-weight: 500;
}
.note span{
  display: block;
  color: #575757;
  font-size: 16px;
  margin-top: 5px;
}
.note .bottom-content{
  padding-top: 10px;
  border-top: 1px solid #ccc;
}
.bottom-content span{
  color: #6D6D6D;
  font-size: 14px;
}
.bottom-content .settings{
  position: relative;
}
.bottom-content .settings i{
  color: #6D6D6D;
  cursor: pointer;
  font-size: 15px;
}
.settings .menu{
  z-index: 1;
  bottom: 0;
  right: -5px;
  padding: 5px 0;
  background: #fff;
  position: absolute;
  border-radius: 4px;
  transform: scale(0);
  transform-origin: bottom right;
  box-shadow: 0 0 6px rgba(0,0,0,0.15);
  transition: transform 0.2s ease;
}
.settings.show .menu{
  transform: scale(1);
}
.settings .menu li{
  height: 25px;
  font-size: 16px;
  margin-bottom: 2px;
  padding: 17px 15px;
  cursor: pointer;
  box-shadow: none;
  border-radius: 0;
  justify-content: flex-start;
}
.menu li:last-child{
  margin-bottom: 0;
}
.menu li:hover{
  background: #f5f5f5;
}
.menu li i{
  padding-right: 8px;
}

.popup-box{
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2;
  height: 100%;
  width: 100%;
  background: rgba(0,0,0,0.4);
}
.popup-box .popup{
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 3;
  width: 100%;
  max-width: 400px;
  justify-content: center;
  transform: translate(-50%, -50%) scale(0.95);
}
.popup-box, .popup{
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
}
.popup-box.show, .popup-box.show .popup{
  opacity: 1;
  pointer-events: auto;
}
.popup-box.show .popup{
  transform: translate(-50%, -50%) scale(1);
}
.popup .content{
  border-radius: 5px;
  background: #fff;
  width: calc(100% - 15px);
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
}
.content header{
  padding: 15px 25px;
  border-bottom: 1px solid #ccc;
}
.content header p{
  font-size: 20px;
  font-weight: 500;
}
.content header i{
  color: #8b8989;
  cursor: pointer;
  font-size: 23px;
}
.content form{
  margin: 15px 25px 35px;
}
.content form .row{
  margin-bottom: 20px;
}
form .row label{
  font-size: 18px;
  display: block;
  margin-bottom: 6px;
}
form :where(input, textarea){
  height: 50px;
  width: 100%;
  outline: none;
  font-size: 17px;
  padding: 0 15px;
  border-radius: 4px;
  border: 1px solid #999;
}
form :where(input, textarea):focus{
  box-shadow: 0 2px 4px rgba(0,0,0,0.11);
}
form .row textarea{
  height: 150px;
  resize: none;
  padding: 8px 15px;
}
form button{
  width: 100%;
  height: 50px;
  color: #fff;
  outline: none;
  border: none;
  cursor: pointer;
  font-size: 17px;
  border-radius: 4px;
  background: #6A93F8;
}

@media (max-width: 660px){
  .wrapper{
    margin: 15px;
    gap: 15px;
    grid-template-columns: repeat(auto-fill, 100%);
  }
  .popup-box .popup{
    max-width: calc(100% - 15px);
  }
  .bottom-content .settings i{
    font-size: 17px;
  }
}
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