How to grab substring before a specified character jQuery or JavaScript
Solution 1:
var streetaddress= addy.substr(0, addy.indexOf(','));
While it's not the best place for definitive information on what each method does (mozilla developer network is better for that) w3schools.com is good for introducing you to syntax.
Solution 2:
var streetaddress = addy.split(',')[0];
Solution 3:
try this:
streetaddress.substring(0, streetaddress.indexOf(','));
Solution 4:
//split string into an array and grab the first item
var streetaddress = addy.split(',')[0];
Also, I'd recommend naming your variables with camel-case(streetAddress) for better readability.