Note: This documentation applies to Knockout 3.4.0 and later.
ko.onError
Knockout wraps internal asynchronous calls and looks for an optional ko.onError
callback to execute, if an exception is encountered, before throwing the original error. This gives you the opportunity to run custom logic, such as passing the error to a logging module. Additionally, since the original call is wrapped in a try/catch, the error passed to ko.onError
contains a stack
property, which is not true in many browsers when handling errors using window.onerror
.
This functionality applies to errors in the following contexts:
- asynchronous updates made as part of the
textInput
andvalue
binding - component loading of a cached component when not configured for synchronous loading
- rate-limited and throttled computeds
- event handlers added by
ko.utils.registerEventHandler
including those bound by theevent
andclick
bindings
Example
ko.onError = function(error) { myLogger("knockout error", error); };
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