jquery method to obtain event source object

In JQuery, you can easily obtain the event source object. In the event handling function, the event source object can be obtained by passing the event object (event). In addition, JQuery also provides a function to obtain the event source object, namely event.target.

The difference between event.target and this

In event processing functions, we often use this to refer to the event source object, and event.target can also be used to obtain the event source object. The difference between them is that this points to the element to which the event handler is currently bound, while event.target points to the actual target element of the event.

For example:

HTML code:

<div>
  <p>这是一个段落</p>
  <button>点击我</button>
</div>

JavaScript code:

$("div").on("click", function(event) {
  console.log("this:", this);  // 输出<div>元素
  console.log("event.target:", event.target);  // 点击<div>输出<div>元素，点击<p>输出<p>元素，点击<button>输出<button>元素
});

Usage of event.target

In addition to the above In addition to using event.target in the example to obtain the event source object, you can also use the functions provided by JQuery to obtain it. JQuery provides an encapsulation function of event.target, namely $(event.target), which can easily obtain the event source object.

For example:

$("div").on("click", "button", function(event) {
  var $button = $(event.target);  // 获取被点击的<button>元素
  console.log($button.text());  // 输出"点击我"
});

In this example, when we click the button, we can get the clicked button object through $(event.target). Then you can perform some operations on this object, such as getting the text of the button.

Summary

It is very convenient to obtain the event source object through JQuery. You can use event.target or this to obtain it. When processing events, choosing an appropriate method to obtain the event source object according to the specific situation can make the code more concise and readable.

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