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How do I know if XMLHttpRequest failed to complete due to a network problem?

In web programming (JavaScript, Dart, etc.), how can I find out if XMLHttpRequest (aka AJAX) failed to complete due to a network error?

I define a network error as nothing more than DNS, TCP, connection problems, etc.

Thank!

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3 answers

In Dartium, and at least in Chrome JS, you can detect a failure by seeing that you press ReadyState == 4 ("done") with a status of zero. Zero is not a valid server response, all HTTP server responses exceed 100, so this means that it did not actually reach the server (or at least the server did not say proper HTTP).

onError .

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AJAX responseText, , , data.status data.responseText , (200 , 500 ..).

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u need to check which response code is returned from the response, if this code is returned 500, means there is a problem with the network.

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