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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
Posted by 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
231,271 Points
Steven Parker
Steven Parker
231,271 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).
Lindsay Sauer
Lindsay Sauer
12,029 Points
Lindsay Sauer
Lindsay Sauer
12,029 Points

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
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.