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i want to disable or hide the field in a client script, i used both field.isDisabled = true, field.isDisplay = false, but both not worked. anyone please help me?

no on saveRecord. Initially i had it in userevent beforesubmit, now changed to saveRecord.

Why are you trying to hide/disable fields in saverecord? It doesn't make any sense from a user point of view

The record will save &amp; redirect back to itself in view mode

Do you want to start with what you're trying to do as a business requirement (*not* your solution, the requirement), and we'll take it from there?

i have three exchange rate fields for EUR, USD, GBP. if the currency is EUR, i dont need the exchange rate of EUR, so i need to disable this field.Thi sisthe requirement

And you need to show hide when the currency changes? Do you need to hide this when the record loads also?
You probably need a UE beforeLoad and a client script on change.

i tried beforeLoad, but the updateDisplayType didint work out there.

no the currency field cannot be changed, so no need of fieldchanged function

You should be fine to use beforeLoad in edit mode probably gonna struggle in view.

Cannot find function updateDisplayType in object Field

you should be getting the field off the form

i am getting the custom field already created.

not "record.", "form."
You need to do
let form = context.form.
let myFieldObj = form.getField({fieldId:'custom_field_id'});
then update the display type

You're not updating the record field you're updating the field on the form.