Lightning Components Developer’s Guide

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Warning Messages

To help debug your client-side code, you can use the warning() method to write output to the JavaScript console of your web browser.

Use the $A.warning(string) method to write a warning message to the JavaScript console. The parameter is the message to display. For example, $A.warning("This is a warning message."); will output "This is a warning message." to the JavaScript console. A stack trace will also be displayed in the JavaScript console.

For instructions on using the JavaScript console, refer to the instructions for your web browser.