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The compatibility table on this page is generated from structured data.
We can use xhr.responseType property to set the expected response format: Let's call a RESTful API to get the response as JSON: The XMLHttpRequest object changes state as the request progresses. And what I found was that the order they call things is: Which means that when you're overriding the send method, onreadystatechange is null since jQuery doesn't set it before calling send. Why is this.onreadystatechange null? The responseText property returns the response as a string.
So, if that were always done, onreadystatechange (if actually set) would not be null and would be a function. Subsequent clicks (if I don't refresh the page) will work as expected, but the initial click will not. The send() method opens the network connection and sends the request to the server. The newsletter is offered in English only at the moment. The normal way for creating/sending an XHR is this order: I was always told/shown to create the new XMLHttpRequest, then whatever order of setting onreadystatechange and calling open, but only after both of those should I call send. So, for some reason, FF isn't seeing or reporting the first two status reports (1 and 3) and is apparently only seeing the last (status 4). The XMLHttpRequest.onload event handler, however, is suggested to be used in cross-domain Ajax with Cross-Origin Resource Sharing (CORS) instead of the onreadystatechange event handler. ; async – if explicitly set to false, then the request is synchronous, we’ll cover that a bit later. Am I bringing my character back to life too much? When is a closeable question also a “very low quality” question? Many of the tasks On the FIRST click, FF52 is only alerting status 4 and displaying the returned content.
If you want to use the response as a text string, use the responseText
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