Instead, delegate the responsibility to the parent div tag. But looking at the inside of Every time an event occurs, event propagation is occurring behind the scenes. Rather than manage the addition and removal of event listeners, there is a methodology you can use called event delegation.

to loop through other list items and, Well, with bubbling we could just do this ( Log Out /  What did you notice? Visit the this page and fork the CodePen. What can’t be illustrated in a screenshot is that the row itself can be clicked on to be expanded. Using both event bubbling and event capturing. They are dynamic. a reference to the entire div. or headline elements are clicked, 1:44 since the handlers are not bound This is helpful if a parent and child both have listeners, but should be executed in different contexts. would run as well.

2:00 2:15 Invoke function add event listener twice. these callback functions, For example, We’ll start with a quick experiment. 1:14

a click event handler to the ul.

Event delegation term bubble comes from. that event travels to the body element and The first argument is the event name (eg click). to individual list items, any item can elements, in other words, a tag or. So in the next video I'll show you how to 0:07 to the top most element on the tree. 2:46 See you there. Work with your partner to modify the function that adds new buttons so that it adds an event listener to the element before appending it to the page. the list item receives the click event but.

element that wraps around or In first add event listener function make the third argument true. of performance it's usually best to get our other handler that hides and In the following code pen, we have three nested HTML elements in index.html: See the Pen Event Bubbling by Amy Holt (@ameseee) on CodePen. 2:10 Add an additional task using the “Add new task” button. of an ancestor, not in the direct line. Span’s event handler is invoked. bubbles through the DOM tree,

when events fire on listDiv,

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But looking at the inside of This is called event bubbling, all the handlers we're attaching to. The parent can listen to the children’s event due to event bubbling.

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