difference between event delegation and event binding in js

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  • ? Column introduction
  • ?Event Binding
  • ?Event Delegation
  • ? Select event binding or event delegation
  • ?Write at the end

? Column introduction

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Event delegation and event binding are two different ways of handling events in JavaScript, and they have some key differences:

? Event Binding

  • Directly binding event handlers: Event binding attaches event handlers directly to specific DOM elements. This means you need to explicitly select the elements to which you want to attach the event handler, and bind the event on each element individually.

  • Single element pays attention to events: The way of event binding means that each element needs to pay attention to the event. Therefore, if there are multiple similar elements that need to handle the same type of event, you need to bind each element separately. event handler.

  • Static and dynamic elements: Event binding is typically used with static and dynamically generated elements. For the latter, you need to make sure you bind the event after the element is created.

  • Commonly used for small-scale event processing: For event processing of a small number of elements, event binding is a simple and intuitive method.


//Event binding, bind click event handler for each button
const buttons = document.querySelectorAll('button');

buttons.forEach((button) => {<!-- -->
  button.addEventListener('click', () => {<!-- -->
    // Handle click event

?Event Delegation

  • Delegated event handling: Event delegation is to bind an event handler to a parent element containing multiple child elements, and then delegate the parent element to handle the child element’s events through event bubbling.

  • Single event handler: Event delegation requires only one event handler, no matter how many child elements need to handle the event, which reduces memory consumption and event binding.

  • Dynamic element support: Event delegation also works for dynamically generated elements, because the parent element is usually static and it does not need to know when the child element was created.

  • Commonly used for large-scale event processing: When events need to be processed for a large number of elements, event delegation is usually more efficient.


//Event delegation, delegate the click event to the parent element
const parentElement = document.getElementById('parent-element');

parentElement.addEventListener('click', (event) => {<!-- -->
  if (event.target.tagName === 'BUTTON') {<!-- -->
    //Handle button click event

? Select event binding or event delegation

  • Scale and performance: For events that need to handle a large number of similar elements, especially in performance-sensitive applications, event delegation is often more efficient. But for events with a small number of elements, event binding may be simpler.

  • Dynamism: Event delegation can be more easily applied to elements if they are generated dynamically via JavaScript.

  • Maintainability: Event binding is often more intuitive in code because you can explicitly see the event handler for each element. The event delegate code may require more conditional statements to handle different child elements.

To sum up, event delegation is suitable for events that need to handle a large number of similar elements, while event binding is suitable for events that handle a small number of elements. Which method you choose depends on your specific needs and performance considerations.

? Write at the end

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