Question

I’m trying something like

var store = trans.objectStore("todo"); 

which gives in the console the following erropr

Uncaught Error: NOT_FOUND_ERR: DOM IDBDatabase Exception 3 

Although I expect this error (the object store doesn’t exist) but I want to catch it. I tried to add an onerror to the transaction

trans.onerror = function(e) { ... }

but the onerror is not called. Is there any way to catch this error using onerror? Or is the only way to wrap it with try/catch?

Answer 1

Why do you want to catch that exception? before you call the store, you can check in the database if an object stored with that name exists.

trans.db.objectStoreNames.contains("todo");

If you want to work with exceptions, it’s bad for performance.