如何在jquery中的单击事件的处理程序中获取对象的内容? [英] How to get the this of a object in a handler for a click event in jquery?

问题描述

// begin signals
this.loginSignal

this.init = function(){
  // init signals
  this.loginSignal = new t.store.helpers.Signal;

  // map events
  $('[value]="login"', this.node).click(this.login)
}

this.login = function(){
  // this will dispatch an event that will be catched by the controller
  // but this is not refering to this class
  // and the next line fails :s
  this.loginSignal.dispatch();
}

要使其正常工作，我必须添加

to make it work now i must add

var $this = this;

此行，并使用$this代替this:S

this line and use $this instead of this :S

有什么更清晰的方法吗? 谢谢

any clearer way around? thanks

推荐答案

调用点击处理程序时，this关键字将重新映射到触发事件的元素.要到达原始对象，您需要将函数代码放在闭包中，并在闭包外部引用该对象，在该对象中您仍具有对this的正确引用.

When the click handler is called, the this keyword is remapped to the element that triggered the event. To get to the original object, you want to put the function code in a closure, and make a reference to the object outside the closure, where you still have the correct reference to this.

  // map events
  var thisObject = this;
  $('[value]="login"', this.node).click(function () {
     thisObject.loginSignal.dispatch();
  });

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