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I had tried to use alert, prompt and result:

  • If I open html file (address bar: file:///C:/..../index.html), it worked, a dialog box appeared.

  • If I place html file, javascript file at webapps folder of Tomcat, and open index.html via localhost:8080, it didn't work.

    An error: Uncaught TypeError: Property 'alert' of object [object Window] is not a function

Why and how to fix it?

Lucy Ford
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  • possible duplicate of [Javascript Alert Boxes not working in Chrome](http://stackoverflow.com/questions/4996394/javascript-alert-boxes-not-working-in-chrome) – Josh Aug 30 '12 at 16:47

1 Answers1

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Do you have a pop up blocker plug-in installed? If you do, disable/remove it and see if the error goes away.

OR

Somewhere in your code you overrode alert. Check for var alert = ... or some other kind of declaration like that. Also check for window.alert declarations.

heretolearn
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