存在类，但出现jquery错误:TypeError $(...)为null [英] Class exists but jquery errors: TypeError $(...) is null

问题描述

在网站http://yn1nll的底部，有一个名为"Inloggen"的按钮.当您单击它时，将显示一个名为"userdata"的div.出于某种神秘的原因，什么也没发生.

At the bottom of the website http://yn1[dot]nl there is a button called "Inloggen". When you click on it a div called "userdata" should show up. For some mysterious reason nothing happens.

Firebug说:

TypeError: $(...) is null
Line: 46

该行包括:

$(".userdata").toggle("4000", function() { });

这有什么问题? div存在并且具有类名"userdata".

What is wrong about that? The div exists and has the class name "userdata".

推荐答案

错误消息很明显:$(...)返回null.这意味着$全局变量不能等于jQuery，因为jQuery永远不会返回null(无论所讨论的div是否存在).

The error message is clear: $(...) returns null. That means the $ global variable cannot be equal to jQuery, because jQuery would never return null (regardless of whether the div in question exists or not).

实际上，您的代码包含一个调用 jQuery.noConflict 的无冲突脚本，该脚本放弃对$变量的控制.

Indeed, your code includes a no-conflict script that calls jQuery.noConflict, which relinquishes control of the $ variable.

解决方案:要么删除无冲突脚本(这可能会破坏其他事情，我不知道)，要么编写jQuery而不是$.

Solution: either remove the no-conflict script (which might break other things, I have no idea) or else write jQuery instead of $.

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