jQuery $（this）.next（）没有按预期工作 [英] jQuery $(this).next() not working as expected

问题描述

我正在尝试创建一个由悬停事件触发的简单下拉列表。为了节省编写代码，我想利用$（this）选择器但是当我尝试将$（this）下一个'a'元素作为目标时，我一直遇到问题。有没有人知道在使用$（this）选择器时对此进行编码的正确方法？

I am attempting to create a simple dropdown that is triggered by a hover event. To save on writing code I want to take advantage of the $(this) selector but I keep running into a problem when I try to target $(this) next 'a' element. Does anyone know the correct way to code this while still using the $(this) selector?

在下面的代码中，如果我将$（this）.next（'a'）更改为$（'。base a'），代码工作正常，但我会每次我想使用不同的类选择器使用此功能时，必须编写相同的jQuery代码块。

In the below code if I change $(this).next('a') to $('.base a') the code works fine but then I would have to write the same block of jQuery code for each time I want to use this feature using a different class selector each time.

Jquery代码：

var handlerIn = function() {
var t = setTimeout(function() {
        $(this).next('a') <==== Problem is here
        .addClass('active')
        .next('div')
        .animate({'height':'show'}, {duration:'slow', easing: 'easeOutBounce'});
}, 400);
$(this).data('timeout', t);   
} ;

var handlerOut = function() {
clearTimeout($(this).data('timeout'));
$(this).next('a') <==== Problem is here
  .removeClass('active')
  .next('div')
  .slideUp();

};

$('.base').hover(handlerIn, handlerOut); 

HTML code：

HTML code:

<div id="info" class="base">
<a href="#" id="info-link" title=""></a>
        <div id="expanded-info">
               <!-- Stuff here -->              
         </div>
</div>

所以我也试过没有运气......任何想法：

So I also tried with no luck...any ideas:

var handlerIn = function(elem) {
var t = setTimeout(function() {
        $(elem).next('a') 
        .addClass('active')
        .next('div')
        .animate({'height':'show'}, {duration:'slow', easing: 'easeOutBounce'});
}, 400);
$(elem).data('timeout', t);   
} ;

var handlerOut = function(elem) {
clearTimeout($(elem).data('timeout'));
$(elem).next('a') 
  .removeClass('active')
  .next('div')
  .slideUp();

};
$('.base').hover(handlerIn($(this)), handlerOut($(this)));

推荐答案

JavaScript是函数作用域，而不是块作用域：

JavaScript is function scoped, not block scoped:

var handlerIn = function() {
    var self = this;
    var t = setTimeout(function() {
        $(self).next('a')
            .addClass('active')
            .next('div')
            .animate({'height':'show'}, {duration:'slow', easing: 'easeOutBounce'});
        }, 400);
    $(this).data('timeout', t);   
};

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