Catalog Item How do you grey out previous selections

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Hello All, I am struggling with a script to grey out all fields before the variable being selected.   The idea is that a customer is filling out a Catalog Item, as they complete a variable field the previous field is greyed out.   If a condition is met, then the form is reset.   I believe this would be a Client Script.   Do you have an idea of how to accomplish this?

I can possibly create a script with logic to include all variables in question, but that could be lengthy, I am looking for a script that I don't have to define every variable with the Catalog Item.

Let's use example:

u_1a dropdown

u_1b selection box

u_1c multiple choice

u_1d multiple line text

u_1e date

u_1f   yes/no if no, reset form

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I ended up using UI Policy OOB.   Works out well, but just took a bit of time to work out all the tweaks.

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Hi Steven, thanks for the like... I just posted another question, do you want to take a poke at it in relationship to this thread?

How do I add a reloadWindow script to a Form UI Policy (Service Portal)?