如何在php代码中调用jquery函数-$未定义

Question

I want to use jQuery-confirm dialog instead of echoing a Javascript alert from PHP. When I run following code it shows me this error:

$ is not defined

echo "<script>$.alert({title: 'Alert!',content: 'Simple alert!',});</script>";

Answer 1

Be sure to include the jQuery library first.

Then, if it still do not work, like you say in comments, try wrapping your alert inside a $(document).ready() :

echo "<script>$(document).ready(function(){$.alert({title: 'Alert!',content: 'Simple alert!'});});</script>";

Answer 2

您必须了解Javascript在客户端（浏览器）上运行，并尝试将其输出到html页面，同时包括用于Jquery-confirm的脚本源，您将看到$ .alert开始工作。

Answer 3

您想确认是否已链接jQuery库...，也可以将代码放在包含的jQuery库之后...

Answer 4

Endless thanks to all. I have solved my problem with moving script libraries to my header section. And it works now ;)