A Todo List with vanilla Javascript, no Jquery/libraries

All this while i have using jquery for simple DOM traversing and manipulation without any second thoughts but here is a simple example on why it is far more simpler and easy to build a TODO List with Vanilla JS without any jquery. Lets dive right into the code and some explanation along the way.

Here is the link to the github repo: https://github.com/arunkp/Simple-todo. Feel free to fork & build on top of it.

At first, you create an index.html with the link to your style.css and app.js as follows:

index.html
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<!DOCTYPE html>
<html>
 
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <link rel="stylesheet" href="style.css">
    <title>Todo List</title>
</head>
 
<body>
    <div class="container">
        <input autofocus type="text" id="add" placeholder="Type your Task and press Enter">
        <ul id="columns">
        </ul>
        <div class="container">
        </div>
    </div>
    <script type="text/javascript" src="app.js"></script>
</body>
 
</html>

Next you create the style.css where you will style your todo list accordingly,

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body {
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}
 
* {
    box-sizing: border-box;
}
 
body {
    background: #f5f5f5;
}
 
.container {
    max-width: 768px;
    padding-top: 20px;
    margin: auto;
}
 
input#add {
    width: 100%;
    height: 42px;
    text-indent: 15px;
    font-size: 16px;
    border-radius: 4px;
    border: 1px solid #e0e0e0;
}
 
[draggable] {
    -moz-user-select: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-user-drag: element;
}
 
ul {
    padding: 0;
    margin: 0;
    position: relative;
    width: 100%;
    margin-top: 10px;
}
 
ul:before {
    content: "No items Added";
    position: absolute;
    right: 0;
    left: 0;
    font-size: 16px;
    text-align: center;
    color: rgba(0, 0, 0, 0.3);
    font-style: italic;
    top: 15px;
    z-index: -1;
}
 
ul li {
    position: relative;
    z-index: 1;
    list-style-type: none;
    background: #fff;
    width: 100%;
    display: block;
    padding: 0;
    padding: 16px 16px 16px 40px;
    font-size: 14px;
    border-left: 1px solid #e0e0e0;
    border-right: 1px solid #e0e0e0;
    border-bottom: 1px solid #e0e0e0;
    border-top: 1px solid #fff;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    cursor: move;
}
 
ul li label {
    display: block;
}
 
ul li:focus,
ul li:hover,
ul li:active {
    background: #fffcfc;
}
 
ul li:first-of-type {
    border-top: 1px solid #e0e0e0;
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
}
 
ul li:last-of-type {
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
}
 
ul li .options {
    font-size: 12px;
    margin-top: 10px;
}
 
ul li .options a {
    margin-right: 10px;
    color: #2980b9;
    text-decoration: none;
}
 
ul li.column.dragElem {
    opacity: #fffcfc;
    border-radius: 4px;
}
 
ul li.column.over {
    border: 2px dashed #2980b9;
}
 
ul li.column .imp {
    position: absolute;
    top: 16px;
    right: 16px;
    color: #e0e0e0;
    font-size: 18px;
    text-decoration: none;
}
 
ul li.column .imp:hover {
    text-decoration: none;
}
 
ul li.imp-task .imp {
    color: #e67e22;
}
 
ul li .done-img {
    display: none;
    position: absolute;
    left: 16px;
    top: 16px;
    color: #27ae60;
    text-decoration: none;
}
 
ul li.done .done-img {
    display: block;
    color: #27ae60;
}
 
ul li .date {
    color: #90949c;
}

Then next is the logic with Javascript

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(function(funcName, baseObj) {
    funcName = funcName || "docReady";
    baseObj = baseObj || window;
    var readyList = [];
    var readyFired = false;
    var readyEventHandlersInstalled = false;
 
    function ready() {
        if (!readyFired) {
            readyFired = true;
            for (var i = 0; i < readyList.length; i++) {
                readyList[i].fn.call(window, readyList[i].ctx);
            }
            readyList = [];
        }
    }
 
    function readyStateChange() {
        if (document.readyState === "complete") {
            ready();
        }
    }
 
    baseObj[funcName] = function(callback, context) {
        if (typeof callback !== "function") {
            throw new TypeError("callback for docReady(fn) must be a function");
        }
 
        if (readyFired) {
            setTimeout(function() { callback(context); }, 1);
            return;
        } else {
            readyList.push({ fn: callback, ctx: context });
        }
        if (document.readyState === "complete") {
            setTimeout(ready, 1);
        } else if (!readyEventHandlersInstalled) {
            if (document.addEventListener) {
                document.addEventListener("DOMContentLoaded", ready, false);
                window.addEventListener("load", ready, false);
            } else {
                document.attachEvent("onreadystatechange", readyStateChange);
                window.attachEvent("onload", ready);
            }
            readyEventHandlersInstalled = true;
        }
    }
})("docReady", window);
 
docReady(function() {
    document.getElementById("add").focus();
    var dragSrcEl = null;
    var storeArr = [];
    var counter = 1;
    var loadnotes = function(e) {
        console.log(storeArr);
        if(storeArr.length>0) {
            storeArr.map(function(elem){
                console.log(JSON.parse(elem));
            });
        }else {
            // console.log("no data found");
        }
    }
    var addTask = function(e) {
        var today = new Date();
        var code = e.which;
        if (code == 13) e.preventDefault();
        var val = e.currentTarget.value;
        if (code == 13 && val.length > 0) {
            var count = ++counter;
            stitchHTML(count,val, today);
            var elem = document.querySelectorAll('.column');
            addClickHandlers();
            var store = { value: val, timestamp: today.toLocaleString().split(",")[0] };
            saveToStore(store);
            e.currentTarget.value = "";
        }
        
        var cols = document.querySelectorAll('#columns .column');
        [].forEach.call(cols, addDnDHandlers);
        
    }
 
    function saveToStore(obj) {
        obj = JSON.stringify(obj);
        storeArr.push(obj);
        window.localStorage.setItem("user",storeArr);
        a = window.localStorage.getItem("user");
        console.log(JSON.stringify(a));
        console.log(JSON.parse(a));
    }
 
    function handleDragStart(e) {
        dragSrcEl = this;
        e.dataTransfer.effectAllowed = 'move';
        e.dataTransfer.setData('text/html', this.outerHTML);
 
        this.classList.add('dragElem');
    }
 
    function handleDragOver(e) {
        if (e.preventDefault) {
            e.preventDefault();
        }
        this.classList.add('over');
        if (this.classList.contains('dragElem')) {
            this.classList.remove('dragElem');
        }
        e.dataTransfer.dropEffect = 'move';
 
        return false;
    }
 
    function handleDragLeave(e) {
        this.classList.remove('over');
    }
 
    function handleDrop(e) {
 
        if (e.stopPropagation) {
            e.stopPropagation();
        }
 
        if (dragSrcEl != this) {
            this.parentNode.removeChild(dragSrcEl);
            var dropHTML = e.dataTransfer.getData('text/html');
            this.insertAdjacentHTML('beforebegin', dropHTML);
            var dropElem = this.previousSibling;
            addDnDHandlers(dropElem);
        } else {
            this.classList.remove('dragElm');
        }
        this.classList.remove('over');
        addClickHandlers();
        return false;
    }
 
    function addDnDHandlers(elem) {
        elem.addEventListener('dragstart', handleDragStart, false);
        elem.addEventListener('dragover', handleDragOver, false);
        elem.addEventListener('dragleave', handleDragLeave, false);
        elem.addEventListener('drop', handleDrop, false);
        elem.addEventListener('dragend', handleDragEnd, false);
    }
 
    function handleDragEnd(e) {
        this.classList.remove('over');
    }
 
    function makeTaskImp(e) {
        e.preventDefault();
        var li = e.currentTarget.closest('li');
        if (!li.classList.contains('imp-task')) {
            li.classList.add('imp-task');
        } else {
            li.classList.remove('imp-task');
        }
    }
 
    function addClickHandlers() {
        var deleteLink = document.querySelectorAll('.delete');
        for (var i = 0; i < deleteLink.length; i++) {
            deleteLink[i].addEventListener('click', deleteTask);
        }
 
        var impLink = document.querySelectorAll('.imp');
        for (var j = 0; j < impLink.length; j++) {
            impLink[j].addEventListener('click', makeTaskImp);
        }
 
        var doneLink = document.querySelectorAll('.done');
        for (var k = 0; k < doneLink.length; k++) {
            doneLink[k].addEventListener('click', doneTask);
        }
    }
 
    function doneTask(e) {
        e.preventDefault();
        var li = e.currentTarget.closest('li');
        li.classList.add('done');
        li.querySelector('.imp').remove();
        e.currentTarget.remove();
    }
 
    function deleteTask(e) {
        e.preventDefault();
        e.currentTarget.closest('li').remove();
    }
 
    function stitchHTML(count, val, date) {
        var html = '<li class="column" draggable="true" id="task' + count + '">';
            html += '<div class="done-img">&#10004;</div>';
            html += '<div class="todo-val">';
            html += val;
            html += '</div>';
            html += '<div class="options">';
            html += '<a href="#" class="delete">Delete</a>';
            html += '<a href="#" class="done">Mark Done</a>';
            html += '<span class="date" title="' + date.toLocaleString().split(",")[1] + '">' + date.toLocaleString().split(",")[0] + '</span>'
            html += '</div>';
            html += '<a href="#" class="imp">&#9733;</a>';
            html += '</li>';
            document.getElementById('columns').innerHTML += html;
    }
 
    document.getElementById('add').addEventListener('keyup', addTask);
    loadnotes();
});

Finally, you can visit this URL for live preview: https://arunkp.com/todo/

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