Understanding File Upload

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Krishan Agarwal

postedon July 2, 2013at 11:59 AM

Hi,

Want to understand the File upload functionality a little better. So, I walk through the steps and then ask my question:

Step 1 : Add File Upload component. User can click on it and select a file from its desktop.

Step 2 : Add a button and add a script action to it.

Now my question:

I do not see any code in the script action, so not sure how the file is getting moved to the server and the binded dataclass is updated?

Thanks & Regards
Krishan

Lukas Mathis

repliedon July 2, 2013at 12:18 PM

You got the first two things right: you need a File Upload Component, and a Button that submits the Screen, and triggers the upload.

The next thing you need to do is to add a variable that is bound to the File Upload Component (type String in older versions of Appway, and HttpFileUpload in newer versions). I'll call that variable $file. This will contain the path of the uploaded file if it's a String, or additional metadata if it's of type HttpFileUpload.

(If your Appway version supports HttpFileUpload, use this, as it makes it easier to get the uploaded file's original name, and other data.)

The Action you add to the button should be a Script Action. In there, you decide what to do with the uploaded file. Here's an example for such a Script:

1Script
2   If FILEEXISTS($file) Then
3      // do something with the file here
4   End
5End

In other words, you need to move the file to wherever you want it to be stored with your Script.

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