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September 11, 2015 15:22
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Test a connection by repeatedly downloading a file
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| <html> | |
| <head><title>download test</title></head> | |
| <body> | |
| <input type="text" id="status" style="width: 100%"> | |
| <div id="log"></div> | |
| <script> | |
| /* | |
| mostly cookbooked from | |
| https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Monitoring_progress | |
| */ | |
| var i = 0; | |
| var stopAfter = 25; | |
| var url = "https://kc.kbtdev.org/static/1m.zero"; | |
| var statusEl = document.getElementById("status"); | |
| var logEl = document.getElementById("log"); | |
| var startTime = 0; | |
| function startDownload() { | |
| var oReq = new XMLHttpRequest(); | |
| oReq.addEventListener("progress", updateProgress, false); | |
| oReq.addEventListener("load", transferComplete, false); | |
| oReq.addEventListener("error", transferFailed, false); | |
| oReq.addEventListener("abort", transferCanceled, false); | |
| startTime = (new Date()).getTime(); | |
| oReq.open("GET", url + ((/\?/).test(url) ? "&" : "?") + startTime, true); | |
| oReq.send(); | |
| } | |
| // progress on transfers from the server to the client (downloads) | |
| function updateProgress (oEvent) { | |
| var timeElapsed = ((new Date()).getTime() - startTime) / 1000; | |
| var kilobytesPerSecond = Math.floor(oEvent.loaded / timeElapsed / 1000); | |
| if (oEvent.lengthComputable) { | |
| var percentComplete = Math.floor(oEvent.loaded / oEvent.total * 100); | |
| statusEl.value = "Rate: " + kilobytesPerSecond + " kB/s; " + percentComplete + "% done"; | |
| } else { | |
| // Unable to compute progress information since the total size is unknown | |
| statusEl.value = "Rate: " + kilobytesPerSecond + " kB/s; " + oEvent.loaded + "bytes done"; | |
| } | |
| } | |
| function transferComplete(oEvent) { | |
| var timeElapsed = ((new Date()).getTime() - startTime) / 1000; | |
| var kilobytesPerSecond = Math.floor(oEvent.loaded / timeElapsed / 1000); | |
| output = ("<p>Transfer " + ++i + " completed in " + timeElapsed + " seconds: "); | |
| output += (oEvent.loaded + " bytes; " + kilobytesPerSecond + " kB/s</p>"); | |
| logEl.innerHTML += output; | |
| if(i < stopAfter) { | |
| startDownload(); | |
| } | |
| } | |
| function transferFailed(evt) { | |
| alert("An error occurred while transferring the file."); | |
| } | |
| function transferCanceled(evt) { | |
| alert("The transfer has been canceled by the user."); | |
| } | |
| startDownload(); | |
| </script> | |
| </body> | |
| </html> |
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