Sheetjs: reading xlsx progress bar

[firas3d]

First, cannot thank you enough for all the efforts.

I am using js-xlsx to read the excel file with multiple sheets inside Adobe ExtendScript, and have a small request:

Reading the xlsx is taking 10 to 20 seconds, and would be great if i can get a feedback percent,
so I map it to a progress bar inside the UI.

Currently, reading xlsx freezes the application till it finishes.

Suggestion: maybe read sheet by sheet or row by row, can solve it.

Hope this feature request will be helpful in other js applications.

[SheetJSDev]

The web browsers have a neat feature called Web Workers that let you run tasks in the background without blocking the UI. That's what http://oss.sheetjs.com/ and http://oss.sheetjs.com/js-xlsx use to ensure the frontend doesn't just stop. There may be a way to do something similar in extendscript.

As for evented read, the major hurdle is the file format. XLSX uses ZIP files and you have to read in the entire file before you can properly unzip. We will think more about this

[firas3d]

The freezing till finish reading is acceptable, as long as we have visual feedback (like progress bar)
Maybe jszip.js can send a progress?

[stof]

sending a progress won't help, as the UI would render it only at the end (as it is frozen)

[dingchaoyan1983]

I want this feature also

[ghost]

It will help if you are using sheet.js correctly, in a web-worker.