Question

34

try-catch doesn't work with XMLHTTPRequest

rated 0 times [ 36] [ 2] / answers: 1 / hits: 26390 / 12 Years ago, sat, may 5, 2012, 12:00:00

I am trying to use the try-catch statements to handle the errors from XMLHTTPRequest, like below:

var xhr = new XMLHttpRequest();

xhr.open('POST', someurl, true);

try{

    xhr.sendMultipart(object);

}

catch(err){

    error_handle_function();

}

When there was a 401 error thrown by xhr.sendMultipart, the error_handle_function was not called. Any idea how to fix this?

Thanks!

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bradley

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4 Years ago

answered 12 Years ago benitoh · Accepted Answer

I think you can't catch server errors that way. you should be checking the status code instead:

var xhr = new XMLHttpRequest();

xhr.onreadystatechange=function() {

    if (xhr.readyState === 4){   //if complete

        if(xhr.status === 200){  //check if OK (200)

            //success

        } else {

            error_handle_function(); //otherwise, some other code was returned

        }

    } 

}

xhr.open('POST', someurl, true);

xhr.sendMultipart(object);