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ElementInternals: setFormValue() method - Web APIs | MDN
setFormValue(value)
setFormValue(value, state)
value
A FileFormData
state Optional
A FileFormData
Note:
In general, state is used to pass information specified by a user, the value is suitable for submission to a server, post sanitization.
For example, if a custom element asked a user to submit a date, the user might enter "3/15/2019".
This would be the state.
The server expects a date format of 2019-03-15, the date in this format would be passed as the value.
NotSupportedError DOMException
Thrown if the element does not have its formAssociated property set to true.
In the following example, a checkbox custom element sets on as the value to send to the server, and checked as the state.
this.internals_.setFormValue("on", "checked");
