I understand that PlUpload supports several runtimes (html5, html4, gears, flash, etc).
But most browsers now a days support flash. And most other file uploaders (namely: uploadify, fancy upload, to name afew) would function via a combination of javascript and flash. And the same file uploaders only support ONE runtime, which is flash. Please correct me if I am wrong here.
Even if the flash player plugin is not installed. A developer can easily integrate flash detection tools and redirect users to a download link. Which is most common for several sites.
Which brings me to the question. Why the need to include any other runtime in pluploader, when flash is enough?
Flash is not always an option. I have users in corporate environments who cannot install software on their machines and are stuck in older browser versions. Plupload allows me to add functionality to my site for most users without sacrificing users who cannot install Flash.
Why we have other runtimes in Plupload is the fact that Flash upload is very buggy. For example it can't chunk files and retain proper progress, it doesn't send cookie/session information by default and it has various problems with SSL. Silverlight on the other hands can load part of a file and send it without any problems with missing progress or cookies. So we tend to recommend having that as a fallback before flash to get better results however the install base for Silverlight is far less than Flash.
Related
You are probably well aware (probably more than me anyway) that many websites use scripts to fingerprint user's browser by gathering info like resolution and screen-size, OS details, browser version and build, installed add-ons, etc.
Is it possible, using javascript to spoof some/every property of your browser (Chomium/Cef or any other), so that it is impossible for later-loaded scripts to fingerprint your browser or detect the navigator object has been tempered with?
If it's not possible to accomplish using JS then how about extensions and addons?
This might be something obvious for the seasoned web developers of you, but I don't have extensive experience with web development, and can't find a definitive answer online either.
I have a feature that allows my client to design his own personal portal, I would like to allow my user to preview a picture from his computer prior to uploading it to the server.
is it possible?.
No docs, and no result on Google, if anyone wonders why am I asking such an allegedly stupid question.
IMPORTANT: I am using this library since it has support for some deprecated browsers such as IE 8-9, hence I need a solution that can work without file API, or a good reliable file API fallback for old IE versions.
To preface this, all of my experience has been with developing Ruby on Rails web apps serving, essentially, text data - I don't have any experience yet with rich media.
I'm looking into developing a music notation app (for practice and because I'm dissatisfied with many of the current options), and am trying to determine whether or not to build a native app or a web app. Since all of my programming experience lies in web development, I would prefer to make this a web app if I can, because if I chose to go native I would need to find a decent cross-platform solution in addition to the usual pitfalls of developing natively.
I suspect that even with HTML5 I wouldn't have access to enough processing power to make a browser-based audio engine feasible. It would need to have the ability to play and sequence not a single large .wav file of a song, but many short .wav files concurrently and in sequence. There would be no need for recording - only playback.
But since I've never done this before I really don't know if this is possible. So, I wanted to pose this to more experienced HTML5 media developers:
For modern browsers (I'm not too concerned with support for older browsers), would such an audio engine be feasible? (As in, is the current landscape of JS libraries and the HTML5 audio API sufficient for building something like this?) Or would something like this be far too CPU / memory hungry in a browser?
Thanks!
In my experience Chrome and Firefox for desktop both work great with multiple, sequenced, .wav files embedded in audio tags. You can trigger them with JavaScript and it all seems to work great.
Unfortunately, Mobile Safari seemed to be unhappy with more than one audio tag playing at once, and Chrome for Android had similar limitations. This was a year ago, so things might be different now.
Since we were targeting iPads, we wound up using Phonegap to mix in some native sound libraries into our HTML & JavaScript app. One gotcha that tripped us up: if you want looping audio samples, stick to .wav files; .mp3 files have some silence at the start and end that's really tricky to get rid of.
I've been investigating Web Audio Api to build synths, and it's still very primitive and difficult to use. The infrastructure seems to have had a boost when Web Audio was introduced, but not much development since. Mobile audio on the web is rarely mentioned, too clunky, or unsupported.
At the same time, JS has become significantly faster with the V8 engine, JS loading can happen as needed, asynchronously, and non-blocking, which may solve many of the CPU/memory concerns you have. Look into NodeJS and various module loaders such as webpack, ES6, for more info.
I think there will be attention to web-based music apps because the web can support multiple users. That could be a good reason to keep pushing through these murky waters.. especially if you're talking concurrent connections.
See Molgav tracker. It works on desktop and mobile, it uses hundred of sampled instruments, it has UI adapted for small mobile touchscreens. See how examples sounds.
I'm looking to play AVI files in a web browser however I can't seem to find a decent tool to do so.
The basic WMP object embed is what I'm using right now but it doesn't really do what I'd like it to do, and I can't really implement JavaScript into it. (AFAIK I can't. I done a little digging and that's the conclusion I came to)
I've also tried DivX though I don't really like it. It has adverts, and I've no idea if JavaScript can be included either.
AFAIK Flash doesn't support AVI playback at all.
Does anyone know of any player at all that can play AVI files on the web, which I could possibly integrate some kind of JavaScript in (or has an API)?
Just a thought too, but would Java itself have anything like this?
The player also needs to be able to source the files like this:
file:\\Network-PC-Name\avi\avifile.avi
What you're looking for is WebChimera, there's no doubt about it. It has the most complex JS API ever made for web video, and it supports all file types.. it also supports "file:///" (for links like file:///C:/avi/avifile.avi).
It is open source and has no advertising. And the best part is that everything inside the player is editable, so you can skin it, add buttons and even add entirely new features to it with mostly just JavaScript. :)
Update
As you mentioned you need it to connect to file:///Network-PC-Name/avi/avifile.avi, this tells me you need this for some Local / Private / LAN use.
In this case, I think the best solution for you is to use WebChimera with Node-Webkit, as it will also give you a JS API based server environment.
WebChimera Player is already ported to NW for Windows and Mac:
https://github.com/jaruba/WebChimeraPlayerNW
On Windows, just download the package, and run nw.exe. To customize just edit the html pages. For Mac, just follow the instructions in the Readme.md.
The great part about using it like this, is that it already has the plugin embedded in the app, so you won't even need to install the plugin for the player to work.
The only thing I can't be fully sure of, is if Network-PC-Name can even be accessed through the file:/// protocol in it's normal usage. But this would still be possible anyway as you could map the network drive, and you can even map it programatically (with only JavaScript!) by using the child process exec to run the necessary command. (child_process is built in node-webkit natively)
flowplayer is recommended by this post:
Flash video player for AVI files (free for commercial use)
not sure about the file:\ source, as that's on your local machine and could be refused by the browser for security reasons
I have a number of users with multi-megabyte files that need to be processed before they can be uploaded. I am trying to find a way to do this without having to install any executable software on their machines.
If every machine shipped with, say, Python it would be easy. I could have a Python script do everything. The only scripting language I can think of that's on every machine is JavaScript. However I know there are security restrictions that prevent reading and writing local files from web browsers.
Is there any way to use this extremely pervasive scripting language for general purpose computing tasks?
EDIT: To clarify the requirements, this needs to be a cross platform, cross browser solution. I believe that HTA is an Internet Explorer only technology (or that the Firefox equivalent is broken).
Would Google Gears work here? Yes, users have to install something, but I think the experience is fairly frictionless. And once it's installed, no more worries.
The application that I maintain and develop for work is an HTML Application or HTA, linked with a SQL Server 2005 backend. This allows various security restrictions to be "avoided". All the client-side components in the application are done with javascript, including writing files to locally mapped network drives and loading data into screens/pages in an AJAXy way.
Perhaps HTA could be helpful for your situation.
For an example of javascript accessing a local file, you might try taking a look at the source of TiddlyWiki, specifically the saveFile, mozillaSaveFile, and ieSaveFile functions. Just click the download link, open the html file it sends you, and search for those functions.
Of course, tiddlywiki is supposed to be used as a local file, not served over the web, so the methods it uses may only work locally.. But it might be a start.
Why not use a flash uploader? http://swfupload.org/
Adobe Flex 4 lets you to open and process a file on a local machine:
http://livedocs.adobe.com/flex/3/langref/flash/net/FileReference.html#load()
It's not exactly JavaScript, but hope that helps.
I believe you can accomplish this using the HTML5 File API.
It is supported in Opera, IE, Safari, Firefox, and Chrome.
you can use fs module from nodeJS to manipulate with filesystem nowadays!