script.js

/**
 * This JavaScript code adds functionality to a task list where users can add tasks, mark them as
 * completed, and remove them, with the data being saved in the browser's local storage.
 */

const inputBox = document.getElementById('input-box');
const listContainer = document.getElementById('list-container');

function addTask(){
    if(inputBox.value === ''){
        alert("You must write something !");
    }
    else{
        let li = document.createElement("li");
        li.innerHTML = inputBox.value;
        listContainer.appendChild(li);
        let span = document.createElement("span");
        span.innerHTML = "\u00d7";
        li.appendChild(span);

    }
    inputBox.value = "";
    saveData();
}

listContainer.addEventListener("click", function(e){
    if(e.target.tagName === "LI"){
        e.target.classList.toggle("checked");
        saveData();
    }
    else if(e.target.tagName === "SPAN"){
            e.target.parentElement.remove();
            saveData();
        }
}, false);

function saveData(){
    localStorage.setItem("data", listContainer.innerHTML);
}

function loadData(){
    listContainer.innerHTML = localStorage.getItem("data");
}

loadData();