const request = new XMLHttpRequest();
request.open('put', url, false);
request.upload.addEventListener('load', function(e) {
alert(request.responseText);
}, false);
Why is the responseText property of the XMLHttpRequest object empty? How can data be accessed in xhr.responseText when using xhr.onreadystatechange and the readyState is 4?
Gert's main point is to make sure you add the event listener to the xhr object and not the xhr.upload object. The reason for this distinction is not entirely clear, as even the spec doesn't provide a clear explanation. It has nothing to do with asynchronous requests, which are the default behavior.
Instead of:
xhr.upload.addEventListener('load', function(e){ alert(xhr.responseText); }, false);
You should use:
xhr.addEventListener('load', function(e){ alert(xhr.responseText); }, false);
(Ignore my previous answer, check out the updated response from Timmmm)
To make it function properly, I found that I had to configure the XMLHttpRequest to run asynchronously.
xhr.open('put',url,true)
xhr.addEventListener('load',function(e){alert(xhr.response)},false)
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