Google Apps Script: Card Service, Google Workspace Add-on, Google Picker
So you have this awesome idea for a Google Workspace Add-on (GWAO), but you need to be able to select Google Drive files and folders as a part of your process.
Sure, you could just open up another tab and find the link and paste it in a text input or paragraph input in your Card Service build, but that is time-consuming and kinda defeats the purpose of the convenience of the sidebar.
Ideally, you would want a built-in File Picker class that would select the files and folders from the directories you need. Whelp… unfortunately, we don’t have that right now for Google Apps Script’s Card Service.
One approach might be to build out a file picker card selecting each parent’s files and folders and navigate through it like, say, a linked list. Now, I haven’t tried this approach, but looking at how slow and memory expensive it is to call your Google Drive through either Google Apps Script’s Drive App class or the Advanced Service Drive Class, I gave this a pass… for now… .
Instead, I decided to incorporate Googles File Picker API as a popup window from the sidebar, because, it’s kinda what it is designed for. Also, not gonna lie, the example at the bottom of the docs was a huge help (cough … copy and paste … cough)
Let’s take a look at what we are going to build.