Responsive To-Do List using HTML, CSS and JavaScript

In this blog, we'll guide you through the process of creating a dynamic to-do list application using HTML, CSS, and JavaScript. Whether you're a coding novice or looking to refine your web development skills, this step-by-step tutorial will empower you to build a functional and visually appealing to-do list from scratch.

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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>To-do List</title>

    <link rel="stylesheet" href="../css/style.css">
    
    <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@20,400,0,0" />
</head>
<body>

    <div class="heading">
        <h1>To Do List</h1>
    </div>

    <div class="add">
        <textarea id="add-text" name="" placeholder="Add ToDo"></textarea>
        <button id="add-btn">Add</button>
    </div>

    <ul class="list">

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

CSS

                    

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                    *{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root{
    --color1: #222433;
    --color2: #b8a2c9;
    --color3: #4c3b71;
    --color4: #c5c3c4;
}

.heading{
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color4);
}
h1{
    font-size: 40px;
    text-align: center;
}
.add{
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-bottom: 1px solid var(--color2);
    padding-bottom: 20px;
}
.add textarea{
    width: 80%;
    padding: 10px;
    font-size: 16px;
    border: 3px solid var(--color2);
    border-radius: 8px;
    outline: none;
    background-color: var(--color3);
    color: white;
}
.add button{
    width: 100px;
    height: 30px;
    font-size: 16px;
    outline: none;
    border-radius: 5px;
    background-color: var(--color4);
}
.list{
    list-style: none;
    margin: 30px 0;
}
.list-item{
    width: 90%;
    height: 70px;
    border: 3px solid var(--color2);
    border-radius: 5px;
    margin: 20px auto;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 0 5px;
}
.list-item .checkbox{
    width: 20px;
    height: 20px;
    border: 1px solid var(--color2);
}
.list-item textarea{
    height: 40px;
    border: 2px solid var(--color2);
    border-radius: 5px;
    font-size: 16px;
    flex-grow: 1;
    background-color: var(--color3);
    color: white;
}
.edit, .delete{
    color: var(--color4);
}
.edit:hover, .delete:hover, .checkbox:hover, #add-btn:hover{
    cursor: pointer;
}
body{
    background-color: var(--color1);
}
@media(min-width: 425px){
    .heading{
        height: 100px;
    }
    .heading h1{
        font-size: 45px;
    }
    .add{
        margin-top: 30px;
        gap: 20px;
        padding-bottom: 30px;
    }
    .add textarea{
        width: 70%;
        font-size: 18px;
    }
    .add button{
        height: 35px;
        font-size: 18px;
    }
    .list-item{
        width: 80%;
        height: 80px;
        margin: 30px auto;
        padding: 0 10px;
    }
    .list-item textarea{
        height: 50px;
        font-size: 18px;
    } 
}

@media(min-width: 768px){
    .add{
        flex-direction: row;
    }
    .add textarea{
        width: 50%;
        font-size: 20px;
    }
    .list-item{
        width: 70%;
        height: 90px;
        margin: 40px auto;
    }
    .list-item textarea{
        height: 60px;
        font-size: 20px;
    }
}

JavaScript

                    

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                    // Get references to DOM elements
let addBtn = document.getElementById("add-btn"); // Button to add a new to-do item
let addText = document.getElementById("add-text"); // Input field for the to-do text
let list = document.getElementsByClassName("list")[0]; // The unordered list to display to-do items
let listItems = document.querySelectorAll(".list-item"); // Initially selected list items

// Create action item when the 'add' button is clicked
addBtn.addEventListener("click", function() {
    // Create a new list item element
    let listItem = document.createElement("li");
    listItem.className = 'list-item'; // Set class for styling
    
    // Populate the list item with a checkbox, textarea, and action buttons
    listItem.innerHTML = `
        <input type="checkbox" class="checkbox"> <!-- Checkbox to mark completion -->
        <textarea name="" id="" disabled>${addText.value}</textarea> <!-- Text area for task description -->
        <span class="material-symbols-outlined edit">edit</span> <!-- Edit button -->
        <span class="material-symbols-outlined delete">delete</span> <!-- Delete button -->
    `;
    
    // Append the new list item to the list
    list.appendChild(listItem);
    attachEventListeners(listItem); // Attach event listeners to the new list item
});

// Attach event listeners to existing list items
listItems.forEach(listItem => {
    attachEventListeners(listItem); // Ensure existing items have the same functionality
});

// Function to attach event listeners to each list item
function attachEventListeners(li) {
    const editBtn = li.querySelector('.edit'); // Select the edit button
    const deleteBtn = li.querySelector('.delete'); // Select the delete button
    const textarea = li.querySelector('textarea'); // Select the textarea
    const checkbox = li.querySelector('.checkbox'); // Select the checkbox

    // Event listener for the edit button
    editBtn.addEventListener('click', () => {
        textarea.disabled = false; // Enable editing of the textarea
        textarea.focus(); // Focus on the textarea for immediate typing
    });

    // Event listener for when the textarea loses focus
    textarea.addEventListener('blur', () => {
        textarea.disabled = true; // Disable editing when focus is lost
    });

    // Event listener for the delete button
    deleteBtn.addEventListener('click', () => {
        li.remove(); // Remove the list item from the DOM
    });

    // Event listener for the checkbox to mark completion
    checkbox.addEventListener('change', () => {
        li.style.opacity = checkbox.checked ? '0.7' : '1'; // Adjust opacity based on completion status
    });
}