How to detect HTTP status from JavaScript

Question

I want to detect in a script, which could be deployed beyond my control, whether the page was delivered with a HTTP status of 200, 404 or 500 etc.

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Answer 1

Page A can be a Javascript that loads page B via AJAX and displays it with document.write or in a pop up window or however.

In such a strategy, you can check return code for success/failure in the AJAX handler and send different things to the output window depending on status.

Most Ajax libraries provide a way to examine the return code....

See for instance "transport.status" with Ajax.Request in Prototype.js