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<!DOCTYPE html>
<meta charset=utf-8>
<title>Process Events for FileReader</title>
<link rel=author title="Jinks Zhao" href="mailto:jinks@maxthon.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
Please choose one file through this input below.<br>
<input type="file" id="filer">
<div id="log"></div>
<script>
var input, reader, progressEventCounter, progressEventTimeList,
lastProgressEventTime;
setup(function() {
input = document.getElementById('filer');
reader = new FileReader();
progressEventCounter = 0;
progressEventTimeList = [];
lastProgressEventTime;
}, { explicit_timeout: true });
var t = async_test("FileReader progress events.")
reader.onprogress = t.step_func(function () {
var newTime = new Date;
var timeout = newTime - lastProgressEventTime;
progressEventTimeList.push(timeout);
lastProgressEventTime = newTime;
progressEventCounter++;
assert_less_than_equal(timeout, 50, "The progress event should be fired every 50ms.");
});
reader.onload = t.step_func_done(function () {
assert_greater_than_equal(progressEventCounter, 1,
"When read completely, the progress event must be fired at least once.")
});
input.onchange = t.step_func(function () {
var files = input.files;
assert_greater_than(files.length, 0);
var file = files[0];
lastProgressEventTime = new Date;
reader.readAsArrayBuffer(file);
});
</script>