How can i change the width of my table with a custom integer property?

[#1]

Hello Community,

i want to change the width of my table, wich i created with an extension.

I have added a custom integer property to enter a value between 50 and 500.

Next, i want to change the width of the table, dependent on the entered value.

This was my code from the JavaScript file.

What i have to do now? How can i get the value from "MyWidthProp" and use it to size the table like in the picture above?

Thank you in advance.

Greetings

Florian