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...

var params = new URLSearchParams(window.location.hash.split('?')[1]);

if(params.get('firstname') && params.get('lastname'))
{
	value = params.get('firstname') + ' ' + params.get('lastname');
}

The snippet above can be repurposed to a variety of uses.  It's helpful to understand the basic mechanics of this code:

• To set the values to a Component, you first need them accessible in the JavaScript.  Line 1 can be copied verbatim into any similar rule code and is used to extract the parameters from the URL.