Seeking how to prevent blank new item from adding to unordered list

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I'm new to Javascript. I set up a simple unordered to-do list where items can be added and removed. Unfortunately, blank list items are also added when the create button is pressed. How do I change the Javascript code so it will not add a blank list item and will only alert the user to add a valid item when the item is blank?

Besides the code below, I have also tried putting the if statement inside the createItem function but then the alert pops up for all items and the blank ones still get created.

let ourForm = document.getElementById("ourForm");
let ourField = document.getElementById("ourField");
let ourList = document.getElementById("ourList");

ourForm.addEventListener("submit", (e) => {
    e.preventDefault();
    createItem(ourField.value);
});

function createItem(x) {
    let ourHTML = `<li>${x} <button onclick="deleteItem(this)">Delete</button></li>`;
    ourList.insertAdjacentHTML("beforeend", ourHTML);
    ourField.value = "";
    ourField.focus();
};

function emptyItem() {
    if (ourField.value == "") {
        alert("Enter a valid to-do item");
        return false;
    };
};

function deleteItem(elementToDelete) {
    elementToDelete.parentElement.remove();
};

You created the emptyItem() function but you never called it.

Creating Lists - Learn to Code HTML & CSS, Creating an unordered list in HTML is accomplished using the unordered list block-level element, <ul> . Each item within an unordered list is individually marked up using the list item <li> element to mark up list items, the description list requires two block-level To nest a list rather than closing a list item, begin a new list. when create an ordered list, unordered list, or definition list i always get a blank line above and below it. is there any way to remove these? they are messing up my lovely formatting.

You can use x.length > 0 to check if the item to be added is empty. Try this

let ourForm = document.getElementById("ourForm");
let ourField = document.getElementById("ourField");
let ourList = document.getElementById("ourList");

ourForm.addEventListener("submit", e => {
  e.preventDefault();
  createItem(ourField.value);
});

function createItem(x) {
  if (x.length > 0) {
    let ourHTML = `<li>${x} <button onclick="deleteItem(this)">Delete</button></li>`;
    ourList.insertAdjacentHTML("beforeend", ourHTML);
    ourField.value = "";
    ourField.focus();
  } else {
    alert("Enter a valid to-do item");
  }
}

function deleteItem(elementToDelete) {
  elementToDelete.parentElement.remove();
}

Popular Science, NOT THAT WE'D WANT TO AVOID IT; INDEED, IN THIS AGE OF l'S AND 0'S, for YEAR'S BEST OF WHAT'S NEW AWARD-WINNING CREATIONS, FROM t  Typically, unordered-list items are displayed with a bullet, which can be of several forms, like a dot, a circle, or a square. The bullet style is not defined in the HTML description of the page, but in its associated CSS, using the list-style-type property.

You could try adding

if (!emptyItem()) return false;

Before createItem(ourField.value); in form submit event.

But in this context !emptyItem() is not very clear, you could change the definition of the function to

function emptyItem() {
    if (ourField.value == "") {
        alert("Enter a valid to-do item");
        return true;
    };

    return false;
};

And change the verification to be easy to understand the intention

if (emptyItem()) return false;

let ourForm = document.getElementById("ourForm");
let ourField = document.getElementById("ourField");
let ourList = document.getElementById("ourList");

ourForm.addEventListener("submit", (e) => {
    e.preventDefault();


    if (emptyItem()) return false;

    createItem(ourField.value);
});

function createItem(x) {
    let ourHTML = `<li>${x} <button onclick="deleteItem(this)">Delete</button></li>`;
    ourList.insertAdjacentHTML("beforeend", ourHTML);
    ourField.value = "";
    ourField.focus();
};

function emptyItem() {
    if (ourField.value == "") {
        alert("Enter a valid to-do item");
        return true;
    };

    return false;
};

function deleteItem(elementToDelete) {
    elementToDelete.parentElement.remove();
};
<form name="ourForm" id="ourForm">
    <input type="text" id="ourField" name="ourField">

    <button type="submit">Send</button>
</form>

<ul id="ourList"></ul>

Popular Mechanics, But Simpson Timber Co. changed its destiny by adding windows, doors, roof, interior partitions, etc. and came up with 1060 square feet of living space. Hi, I'm looking for some tips and advice for best methods to control the spacing in standard lists throughout my site. Mostly concerned with spacing between list items, but also with left-indent

I found that if I changed the order of my original code this also worked and was simple:

let ourForm = document.getElementById("ourForm");
let ourField = document.getElementById("ourField");
let ourList = document.getElementById("ourList");

ourForm.addEventListener("submit", (e) => {
  e.preventDefault();  
  createItem(ourField.value);
});

function createItem(x) {
  let ourHTML = `<li>${x} <button onclick="deleteItem(this)">Delete</button></li>`;
  if (ourField.value == "") {
    alert("Enter a valid to-do item");
    return false;
  };
  ourList.insertAdjacentHTML("beforeend", ourHTML);
  ourField.value = "";
  ourField.focus();
};

function deleteItem(elementToDelete) {
  elementToDelete.parentElement.remove();
};

Implementing an Ordered List, The ordered list of integers given above (17, 26, 31, 54, 77, and 93) can be subclass UnorderedList and leave the __init__ method intact as once again, an empty list the item is not in the list, we can take advantage of the ordering to stop the search the linked list looking for the place where the new node will be added. Change bullet style for an unordered list. Just as you can change the numbering style for an ordered list, you can change the default bullet style for an unordered list with the type attribute. The three possible values for an ordered list include: disc - the default type, represented by a solid circle. square - a solid square. circle - a ring

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The Insurance Press, This is not brought 'forward as a new subject, but as one which has had too scant observation. We add a sample blank for use by the night watchman with a weekly blank for the (Here print a list of the valves, giving the number of each and its location, as: No. How much air does pressure reduce per day or week? 15. Using lists in LaTeX is pretty straightforward and doesn't require you do add any additional packages. For unordered lists, LaTeX provides the itemize environment and for ordered lists there is the enumerate environment. The elements within both environments have to be declared beginning with the \item command. The following code examples show

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Comments
  • You could add if (!emptyItem()) return false; before createItem(ourField.value); on form submit event