Javascript xmlhttp file upload

If this argument is true or not specified, the XMLHttpRequest is processed asynchronously, otherwise the process is handled synchronously. A detailed discussion and demonstrations of these two types of requests can be found on the synchronous and asynchronous requests page. Do not use synchronous requests outside Web Workers. Note: Starting with Gecko There are several types of response attributes defined by the living standard specification for the XMLHttpRequest constructor.

These tell the client making the XMLHttpRequest important information about the status of the response. Some cases where dealing with non-text response types may involve some manipulation and analysis are outlined in the following sections.

This could prove difficult to manipulate and analyze. There are four primary ways of analyzing this XML document:. There are three primary ways to analyze and parse this raw HTML string:. Although XMLHttpRequest is most commonly used to send and receive textual data, it can be used to send and receive binary content.

There are several well tested methods for coercing the response of an XMLHttpRequest into sending binary data. However, more modern techniques are available, since the responseType attribute now supports a number of additional content types, which makes sending and receiving binary data much easier.

For example, consider this snippet, which uses the responseType of " arraybuffer " to fetch the remote content into a ArrayBuffer object, which stores the raw binary data.

For more examples check out the Sending and Receiving Binary Data page. XMLHttpRequest provides the ability to listen to various events that can occur while the request is being processed. This includes periodic progress notifications, error notifications, and so forth. The actual events you can monitor to determine the state of an ongoing transfer are:.

Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Linked 0. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. Accept all cookies Customize settings. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 10 years, 7 months ago. Active 4 months ago. Viewed k times. What am I doing wrong? Willi Mentzel Add a comment. We can summarize its advantages in the following points:. There are other additional features that come with XMLHttpRequest , if you want to know more you can resort to the official specification.

ProgressFunction updates the progress bar and percentage which indicate in a graphical and numerical way the process progress, the rest of the functions only display the proper message for each case. If you have observed the code you probably noticed some commented lines, this is because this is just the base code to create something a little bit more complex , but I decided to leave those lines because maybe can be useful for someone:.

The previous line of code is a call to a. Net HTTP service instead of a page.