Questions tagged [xmlhttprequest-level2]

XMLHttpRequest Level 2 defines various new methods over XMLHttRequest level 1, such as the FormData object and new response types.

XMLHttpRequest level 2 adds new functionality over level 1, including:

The FormData object.
Request-related:
- timeout attribute.
- withCredentials attribute.
- upload attribute.
- Support for new data types at the send() method: ArrayBuffers, Blobs, and FormData.
Response-related:
- overrideMimeType method.
- reponseType attribute, which enables other response types than plain text.
- response attribute, which holds a response whose type is defined in .responseType.
Progress events

See also

Specification: http://www.w3.org/TR/XMLHttpRequest2/
When can I use XMLHttpRequest 2?
MDN: Using FormData objects
MDN: Handling binary data
MDN: Monitoring progress
xmlhttprequest

68 questions

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Why is XMLHttpRequest so slow on localhost

We're developing an application that uses XMLHttpRequest for uploading files with drag&drop support. We're using a jQuery plugin for that, but it's not the issue here. Our tester has reported that uploading files on localhost takes a serious amount…

javascript jquery ajax xmlhttprequest xmlhttprequest-level2

asked Feb 22 '13 at 11:50

d4rky

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What's the optimal length for HTTP range request

I have a javascript downloader that gets big files by multiple HTTP range requests: xhr.setRequestHeader("Range", "bytes=" + start + "-" + end); while end is var end = start + length The range request is a must, because I need to get specific…

http http-headers xmlhttprequest xmlhttprequest-level2

asked Aug 04 '12 at 13:04

whadar

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pause and resume XMLHttpRequest

Here is a working code to preload an MP4 video file on the browser via XHR2. Whenever we execute preloadMe(); the video starts to preload and composite progress event. and as the file completely loaded preload.oncomplete fires and we can detect…

javascript ajax xmlhttprequest-level2

asked Nov 08 '19 at 21:27

Sara Ree

3,417
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Why is XMLHttpRequest upload not failing properly in Firefox?

I'm implementing a file uploader where a user can upload one or more files, using XMLHttpRequest. I'm not using fetch as I need to be able to provide visual feedback on upload progress to the user. The problem I'm having occurs when the server stops…

javascript firefox xmlhttprequest xmlhttprequest-level2 firefox-quantum

asked Jun 29 '18 at 11:35

John Price

11
6

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1 answer

PHP handle $_POST from XMLHttpRequest2 with new FormData() and append()

Using PHP how can I process data sent via XMLHttpRequest2 with new FormData() and append() like traditional form data? In my AJAX parameters handling function the parameters would look like the following: q1=v1&q2=v2&q3=v3 You could use…

php ajax xmlhttprequest-level2

asked Oct 14 '15 at 20:00

John

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Why is progress bar animation not updating by the XmlHttpRequest's addEventListener("progress" ..)?

Here's the working example of Javascript/JQuery multiple file upload using the XmlHttpRequest API. Then I noticed the progress bar animation is not updating itself. Upon debugging I found that the XmlHttpRequest's Progress listener is working. …

jquery file-upload jquery-file-upload multifile-uploader xmlhttprequest-level2

asked Sep 09 '14 at 14:05

fletchsod

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How to disable google chrome cross domain security

What's the command to disable the cross domain security in Google Chrome on Ubuntu.

google-chrome cross-domain xmlhttprequest-level2

asked Aug 12 '14 at 11:10

elhoucine

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Is there a workaround for CORS when using XMLHttpRequest with a local file?

I'd like to use Exif.js to read JPEG EXIF tags from a local file. However, the javascript lib uses XMLHttpRequest to read JPG files as a BinaryFile: function getImageData(oImg, fncCallback) { BinaryAjax( oImg.src, …

html cors html5-filesystem xmlhttprequest-level2

asked Apr 22 '14 at 19:34

michael

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How to I refer to the `postMessage()` function from my XHR callbacks?

The file uploads work perfectly, I can't get the progess and load events to callback I have the following in a JavaScript file as my WebWorker code: UploadFileWorker.js function uploadFile(url, m) { var f = m.file; var fd = new FormData(); …

javascript html web-worker xmlhttprequest-level2

asked Nov 23 '13 at 19:45

user177800

1

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2 answers

How to know which is submited when several ones are defined within a
?

I want to implement the below simple JavaScript function submitForm() based on XMLHttpRequest and FormData. This functions works well on the first but fails on the second one: the function should use input.formaction instead of form.action.…

javascript ajax forms form-data xmlhttprequest-level2

asked Nov 07 '13 at 15:42

oHo

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Cant create FormData object

I tried to create the form data But i can't if(window.FormData) { alert("okk"); } else { alert("not okk"); } It alerts not okk What i do now? I have checked the official mdn documentation of the object but found nothing

javascript object form-data xmlhttprequest-level2

asked Oct 14 '13 at 07:11

bhawin

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How to get the pixel data of an PNG downloaded using XMLHttpRequest (XHR2)

I am using this code from https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Sending_and_Receiving_Binary_Data var oReq = new XMLHttpRequest(); oReq.open("GET", "/myfile.png", true); oReq.responseType = "arraybuffer"; oReq.onload =…

javascript xmlhttprequest xmlhttprequest-level2

asked Aug 29 '13 at 23:43

James Cat

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cannot upload files and vars with xhr2 and web workers

I try to create code to upload files using XHR2 and web workers. I thought I should use web workers , so if a file is big, web page will not freeze. This is not working for two reasons, I never used web workers before, and I want to post to the…

javascript html upload web-worker xmlhttprequest-level2

asked Aug 26 '13 at 14:23

slevin

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Javascript For Loop To Slow for Progress Event Listener Fireing

I am trying to change a element background color according the the progress of an upload. The problem I am having is the for loop is way to slow compared to the progress event listener that fires off. Is there anything I can do about this? var…

javascript for-loop upload progress xmlhttprequest-level2

asked Nov 09 '12 at 02:51

dman

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XmlHttpRequest level 2 : Response returns nothing

I have this problem, I've already asked this question yesterday but i did not have any answer... :( I have this code on the client-side: var formdata = new FormData(); //fill fields of formdata... for example: var file =…

java httpresponse xmlhttprequest-level2

asked Oct 14 '12 at 08:11

Martina

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