set customfield on transition screen activiation

Question

hello there -

I was wondering whether a customfield can have its value set, once the user presses the appropriate transition button, which is linked to a transition screen.

I would like to pre-set a value once the screen is activated.
to elaborate:

After a user creates an issue, then several choices, in form of transition buttons are on the screen, say then the user presses the "Standard" button, a transition screen pops up and I want then a customfield called "Change Category" to be set to "Standard". I am using this in conjunction with the data gathered on that screen and I do not need it "AFTER" the transition button is pressed.

Hope this makes sense

Andrii Mishak · Answer

It is internal plugin, we do not publish it.
First one is creation special custom field type.
Second one is jQuery hook on page load.

werner kolze · Answer

what is your plugin?
do you need to update the custom class every time you update Jira?
the snippets here dont make quite sense to me, sorry, I would not know where to take this from here

Andrii Mishak · Answer

In our plugin we did it by two ugly enough methods:

* extend Custom Field class, and overrride methods to get value to view

public class MyCustomFiled extends AbstractSingleFieldType<DomainClass> {
@Override
    protected DomainClass getObjectFromDbValue(@Nonnull Object o)
    public DomainClass getValueFromIssue(CustomField field, Issue issue) {...}
}

* Use JIRA.Events.NEW_CONTENT_ADDED event

JIRA.bind(JIRA.Events.NEW_CONTENT_ADDED, function () {
    var issueTypeFields = document.getElementsByName('issuetype');
    if (issueTypeFields) {
    var issueTypeField = issueTypeFields[issueTypeFields.length - 1];
    try {
        if (issueTypeField instanceof HTMLSelectElement) {
            if (issueTypeField.options.length) {
               ...
            }
        }
    } catch (e) {
    }
}

The thing is what our custom fields default values are depend on another custom fields values...