reading xlsx progress bar #632

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.

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. ![image](https://cloud.githubusercontent.com/assets/17760039/25069951/7d66f03e-22a0-11e7-8c7c-f37ae50c5090.png) Suggestion: maybe read **sheet by sheet** or **row by row**, can solve it. Hope this feature request will be helpful in other js applications.

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

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

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

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

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

I want this feature also

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

Even if you are using web workers its important to give feedback to user. It would be super useful to be able to show progress (every 100-500 rows would be enough i think).

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reading xlsx progress bar #632