Upload progress bar in CodeIgniter without Flash

Today we will see how we can create a progress bar file upload in CodeIgniter without the need for libraries or plug-ins made with Flash (like SWFUpload) that are beyond our control, because usually these libraries offer us already compiled .swf files, so we can not change anything in them, just in case we have knowledge of programming in ActionScript 2 or 3.

First of all, we have to say that creating a progress bar file upload in PHP is not as easy as it seems. The first problem is that PHP versions prior to 5.2 do not provide the necessary tools to provide information about the file upload at every moment. The second problem is that AJAX, by itself, does not allow us to check the status of the file upload process, since, for obvious security reasons, JavaScript does not have access to files on the client operating system, so you need a “trick” using an iframe.
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SWFUpload in CodeIgniter

In this post we will explain a little what it is and how we can use SWFUpload library in our application made with the php framework CodeIgniter, so that, our users can upload their files to the application in an elegant and visual way, and all combined with safety and ease that CodeIgniter offers for uploading files to the server.

What is SWFUpload?

SWFUpload is a library that allows to our website’s users to upload files to the server, using a combination of Flash and JavaScript.
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