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

Arsalan Raja
Arsalan Raja
6,508 Points
Posted by Arsalan Raja
Arsalan Raja
6,508 Points

document.getElementsByClassName();

why my code is not working when i try to get button value by getElementsByClassName method instead of querySelector method

var bindTaskEvents = function(taskListItem, checkBoxEventHandler)  {

console.log("Bind list item events");

  //select taskListItem's children
  var checkBox = taskListItem.querySelector("input[type=checkbox]");
  var editButton = taskListItem.querySelector("button.edit");
  var deleteButton = taskListItem.querySelector("button.delete");

  //bind editTask to edit button
  editButton.onclick = editTask;

  //bind deleteTask to delete button
  deleteButton.onclick = deleteTask;

  //bind checkBoxEventHandler to checkbox
  checkBox.onchange = checkBoxEventHandler;
}
mikes02
mikes02
Courses Plus Student 16,968 Points

Hi Arsalan,

Just to let you know, I edited your post just to format the code properly, if you need help doing this in future posts there is a handy Markdown Cheatsheet that will explain how to paste code into your forum posts.

As for your question, can you be more specific where you are encountering an issue?

1 Answer

Ben Singer
Ben Singer
8,621 Points
Ben Singer
Ben Singer
8,621 Points

getElementsByClassName requires you to run a loop to affect changes to all the elements you've selected, it doesn't work out of the box the way querySelector and querySelectorAll do.