I am working on a simple to do list and i was hoping if a experienced person could review my code in hope for feedback. I don't use any libraries as i haven't taken time to look about them. I decided to stick with plain js.

Thank you for your time.

Edit: Thank you for the reply, now i'm looking into the semantics in html and fixing my code. ;)

let i = 1;
function myFunction(){
    n = i.toString();
    let theInput = document.getElementById('input').value;
    if(theInput == ""){
         return false;
    let input = `<li class = list id = div${n}>` + theInput +`  <button onclick = myFunction2("div${n}")>Done</button>`;
    newDiv = document.createElement(`div${n}`);
    newDiv.innerHTML = input;
    const currentDiv = document.getElementById("div0");
    currentDiv.insertBefore(newDiv, currentDiv.nextSibling);

    const myFunction2 = function(id){
        let dou = document.getElementById(id)

    const myFunction3 = function(className){
    let elements = document.getElementsByClassName(className);
    while(elements.length > 0){
        font-family: Kufam;
        font-size: 50px;
        border-color: black;
        border-style: solid;
        border-width: 12px;
        border-radius: 8px;
        text-align:  center;

        font-family: Kufam;
        font-size: 25px;
        text-align: center;
<!DOCTYPE html>
<title>To do List</title>
    <link href="https://fonts.googleapis.com/css?family=Kufam" rel="stylesheet" type="text/css">
    <link rel="stylesheet" type="text/css" href="todoliststyle.css">
    <script type="text/javascript" src="functionList.js"></script>
        <br>To do List <br>
        <input id="input" type="text" placeholder="what to do" required maxlength="50">
            <button onclick="myFunction()" >Add</button>
            <button onclick="myFunction3(`list`)">Clear All</button> <br><br>

    <div id="div0">


  • \$\begingroup\$ Welcome to Code Review. I have rolled back your last edit. Please do not update the code in your question to incorporate feedback from answers, doing so goes against the Question + Answer style of Code Review. This is not a forum where you should keep the most updated version in your question. Please see what you may and may not do after receiving answers. \$\endgroup\$ – Heslacher Mar 1 at 15:55

Your app seems to be working :) Good job and keep going ! Take a look at the below notes. I will try to add more a bit later.

  • Treat Your variable name as instructions for other developers (and yourself from future). They should be descriptive. Function with name such as Function2 are not acceptable
  • Your HTML inputs do not have associated labels
  • You use h1 in a wrong way. It's not a proper tag to place the input in. Use a div instead. H1 is used to define (only one) main heading on Your page. Read about HTML semantics and the meaning of each tag
  • some of your let variables could be changed to consts. The rule is as follows - use const whenever it's possible and if it's not - use let
  • Do not style elements by their tag names like h1{} add the proper class to the element and style it with .className syntax in Your CSS
  • Instead of an onCLick inline event listener in Your HTML You could add this handling in the js file using element.addEventListener('typeOfEvent', callback)
  • Add descriptive ID's to the elements - div0 means absolutely nothing
  • Your whole logic is in the if/else statement. Try to move it outside
  • To DO title should not be in the br tag. Use a header or a p instead
  • Your script logic could be also improved -> I will try to describe more a bit later
  • You could also use a shortcut for border styles border: 12px solid black

Coding style

  • Format your code with correct indent. Format your HTML with correct closing tags.
  • Name your variable / function / DOM elements with some meaningful names. Not myFunction1 nor div0.
  • You declared myFunction as global one, but use const for myFunction2. I would suggest use same style for every functions.


  • If you are posting a snippet, skip <!doctype html> and <html> would be acceptable. If you are posting whole HTML, make sure to include <head>, <body>, <meta charset="utf-8" /> tags.
  • Add lang attribute to your HTML, maybe on <html> element.
  • <h1> is used for title of page. Not for input. Use proper tags.
  • <li> should only be placed under <ul> or <ol>. It should not be placed under <div>.
  • Use common HTML tags if available. In case you need custom tags, use name with - in it. For example, <todo-list-item> is acceptable (but not preferred), but <div1> is not.
  • When you need custom tags or using <div> try adding role on it to make it more meaningful.


  • Save a reference to DOM elements, so you do not to getElementById every time some event triggered.
  • Never, never, never feed innerHTML with constructed string values. Especially something from user input. It may cause XSS issues.
  • Add event listeners with addEventListener instead of onclick attribute is preferred.
  • When button [Done] is clicked, you removed the <li> item but keeps its parent in DOM. It should be a mistake.


  • Use margin / padding to locate items. Do not use <br> and space character (U+0020).


  • Wrap input in a <form> and listen to submit event instead of click event. So user may add the todo item with an Enter key. (Don't listen to keyup / keydown / keypress events, they may be confused with IME.)
  • Clear the input when an todo item is added successfully. So user may add next item without clean the input manually.

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