How to grab substring before a specified character jquery or javascript?

You really need to get basics on javascript syntax and how to access a method of a javascript object as your attempt suggests you are lacking basic knowledge of this. 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.

(You should read through a javascript tutorial, esp. The part about String functions).

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