Say you have a checkbox field, and you want to know if a particular option has been checked. Here is the JS to do it.

Example:

Fieldname: ManagerList

Manager to test for: 33

Items currently checked: 33, 34

Syntax:   '[ManagerList]'.indexOf("33") != -1

This means, starting at position 0 in the string of chosen options, the position of the first occurance of "33" is not -1

Otherwise you could easily get

- [ManagerList] returns 33,34
- [ManagerList:JsonArray] returns ["33","34"]

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Also

I think you can use the syntax

[CheckboxList].includes('Other')

in the Bind Expressions / Show of the optional field.

See my repro - here

It appears that [Department:Text] is a backend-only token, meaning it can't be used on the fronted; however, you can do something along the lines of: on the dropdown field under Bind Expressions, On Change/Click use the following code:

form.fields.mytextbox.value = form.fields.dropdown.selected.text;

this will give the text box the value of the dropdown.

When you need to set the value of a Multiple Choice field from some other field's "On Change Click", this syntax works.

Multiple Choice Field Name: EnteringGrade2

Syntax: document.getElementById(form.fields.EnteringGrade2.id).selectedIndex = 0;

This syntax avoids using the actual field ID

The value of 0 is the default entry = "Select"

The multiple choice field has the value and the label. That's two columns of data on each row. When you really need more than two columns for each row, you can have it with some creative SQL and Javascript.