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Is it possible to call a function in a lightning component from an external script?

Let's say I have a standalone lightning component on a page and I want to send it a message from another script is there a way to do that?

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The answer is obvious in an event driven frame work. Creating an event that can be triggered by the script and having a handler in the component where you want to execute the action will do the trick. You trigger a lightning event from an external script as follows:

        var appEvent = $A.get("e.ns:myevt");
        appEvent.setParams({        
            message: "hello world"

        });
        appEvent.fire(); 

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