Skip to main content

Ajax File Uploading

You know that cool Drag and Drop file uploading they have in Gmail? You know, the one where you can drag a file from a folder onto a webpage and upload it?

Have you looked at the code? Looks complicated huh?

Well, thankfully, for any cool bit of JavaScript functionality out there, someone has created a plug in (most likely in jQuery, but not always...).

http://valums.com/ajax-upload/ is (as far as I can tell) a library agnostic JavaScript plug in which factors out all the hard work.

All you have to do is put in a "dummy" element on to which to hook (never end a sentence in a preposition) and then put in a small snippet of code to turn it into a file upload element


<div id="file-uploader">
<noscript>
<p>Please enable JavaScript to use file uploader.</p>
</noscript>
</div>


var uploader = new qq.FileUploader({
// pass the dom node (ex. $(selector)[0] for jQuery users)
element: document.getElementById('file-uploader'),
// path to server-side upload script
action: '/server/upload'
});

Obviously you need to include their library as well...

It has some common backend code to handle uploads as well (php, perl, cgi, java) but no Ruby. Come on guys! Get with it already! Hopefully they will read this and provide...

Comments

Popular posts from this blog

Freezing Gems

What is a gem and why would you want to freeze it?

In Ruby, there are times when you want to access pieces of functionality that other people of written (3rd party libraries) and you normally have 2 options. You can install a plug in or install a gem. Normally the method you use is determined by which ever is made available by the author.

Gems are installed on the host machine and are pretty handy when you want to run things in the command line or else across lots of projects, but their downside is that if you use a gem in a Rails project there is no automatic publishing mechanism when you deploy your site. You will need to log onto the remote host machine and install the gem manually.

Plugins are specific to Rails and are similar to gems in that they are also 3rd party libraries. However they are associated with your Rails project as opposed to your machine so they will get posted to the server on a regular deploy.

Freezing a gem is the process of transforming a gem into a plug in. Essen…

Unit/Functional Testing RubyAMF

One of my current projects is using RubyAMF to communicate with Flash (http://rubyforge.org/projects/rubyamf/). On the whole this is really nice because it allows you to transfer Ruby objects directly to ActionScript ones (as opposed to translating the object into XML, sending the XML and then recreating the object in ActionScript).
However, Rails does not provide a built in transport mechanism for AMF, so we cannot run functional testing directly on the data call (as we could for an XML or HTML transport layer). This is a show stopper for a lot of people (Rails w/o Unit testing = a big mess of trouble when something goes wrong).
We can though serve both the HTML and the AMF formats depending on the request format. This means that we can test the object instantiation logic and make sure there are no errors in the controllers (though we cannot check the actual format of the data being served). In the controller, instead of rendering AMF alone, do the following respond_to do |format|

Comparing Rails' Active Record Pattern with Phoenix/Elixir/Ecto

Rails has a very well established Active Record pattern for dealing with the database. You have an Active Record model which maps to the database table, the schema of the model comes directly from the database schema and you place your model specific methods on the Active Record model. This file is also where you set your model relationships (e.g. has_many, has_one, belongs_to). Your instance of the model has all the methods built in.

In Ecto/Phoenix it's a little different. First of all, the database schema doesn't automatically map to the "model". In fact we don't really have models (as Elixir is a functional paradigm). What happens in one file in Rails, happens in essentially two (or more). You have a schema file (where you have to list out all the attributes and relationships). Using the schema file, your "instance" is essentially a data structure (with no methods on it). If you want to transform the data on your struct, you would use a context modu…