chandan9898kumar / event_propagation

This project depicts about event propagations.

Note : Event Propagation

// The concept of event propagation was introduced to deal with the situations // in which multiple elements in the DOM hierarchy with a parent-child relationship have // event handlers for the same event, such as a mouse click. Now, // the question is which element's click event will be handled first when the user clicks // on the inner element: the click event of the outer element, or the inner element

Event Propagation has three phases:

// Capturing Phase - the event starts from the window down until it reaches the event.target(top to bottom)

// Target Phase - the event has reached the event.target. The most deeply nested element. // that caused the event is called a target element, accessible as event.target.

// Bubbling Phase - the event bubbles up from the event.target element up until it reaches the window, // meaning: when an event happens on an element, it first runs the handlers on it, // then on its parent, then all the way up on other ancestors. // That's the reverse of what is happening in the Capturing Phase(bottom to top).

Note Two

To use bubbling -:

Bubbling is as straightforward as with the normal DOM API; simply attach a handler to an eventual parent of an element, and any events triggered on that element will bubble to the parent, just like in our example in the beginning.

To use capturing -:

Capturing is just as straightforward, but instead of the onClick prop,you have to use onClickCapture on your element.

event.stopImmediatePropagation()

If an element has multiple event handlers on a single event, then even if one of them stops the bubbling, the other ones still execute. In other words, event.stopPropagation() stops the move upwards, but on the current element all other handlers will run. To stop the bubbling and prevent handlers on the current element from running, there’s a method event.stopImmediatePropagation(). After it no other handlers execute(including parent).

Which Events Do Not Bubble and How Are They Handled?

blur (focusout is the same but it actually bubbles). focus (focusin is the same but it actually bubbles). mouseleave (mouseout is the same but it actually bubbles). mouseenter (mouseover is the same but it actually bubbles). load, unload, abort, error, beforeunload.

Add and install react-paginate as a dependency in your app.

$ npm install react-paginate --save