Hello everyone!
I making a website where I’m going to sell rope and I need some help.
The rope comes in different diameters and each diameter has a different price. Let’s say 10mm is 4 dollars a meter. I want the customer to be able to select the length he wants and then add a flat amount is he wants something at the end of the rope, like a splice or an eye. I would look like this; 15 meters of rope x 4 = 60. And then if the customer want an eye at hte end of the rope it will cost an extra $5. How do I do this? Do I need to make a script?
I also need the price displayed to change as the customer makes changes to the options.
I hope someone is able to help 
You will need to familiarize yourself with basic coding concepts to accomplish what you want. There are a wealth of Javascript coding sites which will help you learn Javascript from basic to advanced - Javascript.info is a good one. The Wix Code Resources page provides tutorials, examples, and articles on getting the most out of Wix Code.
You may also want to check out the WixArena - it’s a hub where you can look for Wix Code (and other) experts for hire.
Ihave some experience with Java and Python, but I don’t know how to reference the values in code. What are the names of the variables I need to change?
Take a look at the Wix Code documentation for an introduction. You can also play with the examples here and here .