I want to use a jQueryUI progress bar when I'm reading a very large json file. Is the number of "records" in the file known when calling getJSON(), so that I can advance the progress bar accordingly?
Is the number of "records" in a json file known when calling .getJSON()?
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No, it is not known.
When you call getJSON() commands an HTTP GET. If the response contains JSON, you must wait for the whole thing to load before you can parse it and count any possible "records".
What you can do, however, is to use HTML5 Progress Events to track the progress of your file upload, say, to display a progress bar. See for instance, this tutorial.