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JavaScript Interactive Web Pages with JavaScript Traversing and Manipulating the DOM with JavaScript Traversing Elements

Kien Doan
Kien Doan
17,538 Points

navigation.querySelector

Hi,

I am not sure how to solve it or what you wanna to do from me?

I tried to get the list by navigation.querySelector(ul.li);

or something like this but I don't fully understand your question.

Thanks,

app.js
//Select the naviagation
var navigation = document.getElementById("navigation");

//Select all listItems from the navigation
var listItems = navigation.querySelector("ul.li");

//When a navigation link is pressed
var linkListener = function() {
  console.log("Listener is clicked!");
}

var bindEventsToLinks = function(listItem) {
  //Select the anchor
  var anchor = listItem;
  //Bind the linkListener to the anchor element (a) 
  anchor.onclick = linkListener;
}

for(var i = 0; i < listItems.length ; i++) {
    bindEventsToLinks(listItems[i]);
}
index.html
<!DOCTYPE html>
<html>
<head></head>
<body>

<ul id="navigation">
  <li>
    <a href="#home">Home</a>
  </li>
  <li>
    <a href="#about">About</a>
  </li>
  <li>    
    <a href="#contact">Contact</a>
  </li>
</ul>

<p>A few of my favourite things:</p>
<ul>
  <li>
    Rain drops on roses
  </li>
  <li>
    Whiskers on kittens
  </li>
  <li>
    Brown paper packages wrapped up with string
  </li>
</ul>

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

3 Answers

Steven Parker
Steven Parker
231,269 Points

You have two separate issues here:

  • because of the period, the selector "ul.li" would look for a UL that has the class "li". But you want to select the list items themselves ("ul li" or just "li").
  • querySelector only returns the first item that matches. But you want the whole set (querySelectorAll).

Hi Kien,

It looks like it is asking you to use the .children selector:

 var listItems = navigation.children;
Kien Doan
Kien Doan
17,538 Points

Hi Lindsay,

Yes I got it but have no idea why children. It was not in any previous videos.

Thank you anyway.