我有一个简单的jquery点击事件

<script type="text/javascript">
    $(function() {
        $('#post').click(function() {
            alert("test"); 
        });
    });
</script>

以及在site.master中定义的jquery引用

<script src="<%=ResolveUrl("~/Scripts/jquery-1.3.2.js")%>" type="text/javascript"></script>

我已经检查了脚本被正确解析,我能够看到标记,并直接在firebug中查看脚本,所以我必须被发现。然而,我仍然得到:

$没有定义

jquery没有一个是有效的。我还尝试了它的各种变体,比如$(document)。ready和jQuery等。

这是一个。net 3.5上的MVC 2应用程序,我确信我真的很密集,谷歌上的所有地方都说要检查文件是否被正确引用,我已经检查了一遍又一遍,请建议!: /


当前回答

I had this problem once for no apparent reason. It was happenning locally whilst I was running through the aspnet development server. It had been working and I reverted everything to a state where it had previously been working and still it didn't work. I looked in the chrome debugger and the jquery-1.7.1.min.js had loaded without any problems. It was all very confusing. I still don't know what the problem was but closing the browser, closing the development server and then trying again sorted it out.

其他回答

是否使用其他JavaScript库?如果是这样,你可能需要在兼容模式下使用jQuery:

http://docs.jquery.com/Using_jQuery_with_Other_Libraries

我也遇到过类似的问题。在我的c# MVC应用程序中,JQuery没有被识别出来。我需要移动@Scripts.Render("~/bundles/jquery")从底部的我的_Layout。CSHTML文件到section的头。另外,如果你正在使用visual studio,请确保你已经将Jquery作为Nuget包!

<head>
    @Scripts.Render("~/bundles/jquery")
</head>

这个错误意味着jQuery还没有加载到页面上。使用$(document).ready(…)或其任何变体都没有好处,因为$是jQuery函数。

使用窗口。Onload应该在这里工作。注意,只有一个函数可以分配给window.onload。为了避免丢失原始的onload逻辑,你可以像这样装饰原始函数:

originalOnload = window.onload;
window.onload = function() {
  if (originalOnload) {
    originalOnload();
  }
  // YOUR JQUERY
};

这将执行最初分配给window的函数。onload,然后执行// YOUR JQUERY。

有关装饰器模式的更多详细信息,请参阅https://en.wikipedia.org/wiki/Decorator_pattern。

I had this problem once for no apparent reason. It was happenning locally whilst I was running through the aspnet development server. It had been working and I reverted everything to a state where it had previously been working and still it didn't work. I looked in the chrome debugger and the jquery-1.7.1.min.js had loaded without any problems. It was all very confusing. I still don't know what the problem was but closing the browser, closing the development server and then trying again sorted it out.

我得到了同样的错误消息,当我拼写错误的jQuery引用,而不是type="text/javascript",我键入"…javascirpt"。;)