Adding an id to a ul tag using JavaScript

I am trying to dynamically add an ID called "myMenu" using JavaScript to a ul element for a search filter. Unfortunately, I am unable to directly access the ul tag to change it, so I need to do it via JavaScript. As I am new to JavaScript, I am looking to switch from targeting elements by class to specifically target the ul element.

<div class="main-menu">
<ul>
<li></li>
<li></li>
<li></li>
</ul>
</div>

<input type="text" id="mySearch" onkeyup="myFunction()" placeholder="Search.." title="Type in a category">
function myFunction() {
  // Declare variables
  var input, filter, ul, li;
  input = document.getElementById("mySearch");
  filter = input.value.toUpperCase();
  ul = document.getElementById("myMenu");
  li = ul.getElementsByTagName("li");

  // Loop through all list items, and hide those who don't match the search query
  for (let i = 0; i < li.length; i++) {
    if (li[i].innerHTML.toUpperCase().indexOf(filter) > -1) {
      li[i].style.display = "";
    } else {
      li[i].style.display = "none";
    }
  }
}

Answer №1

If you're looking to include an identifier to the ul displayed in your example, simply follow these steps:

$("div.main-menu ul").attr("id", "myMenu");

According to @Rory-MacCrossan, do you actually require an id for this?

Answer №2

If you want to achieve this with vanilla JavaScript, you can use the following code snippet:

const ulEl = document.querySelector('.main-menu > ul');
ulEl.setAttribute('id', 'main-menu-list');

console.dir(ulEl);
<div class="main-menu">
  <ul>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</div>

It might be more suitable to change <div class='main-menu'> to <div id='main-menu'>, unless there are other elements that should have the main-menu class.

You can refer to these resources for more information:

https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector

https://developer.mozilla.org/en-US/docs/Web/API/Element/setAttribute

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