Add support for calculate and dynamically change offset position for …

[romanlex]

Sorry for bad English.
Add support for calculate and dynamically change offset position for dropdown menu.
Function call always when call Popper.js modifierFn.
Now I can change dynamically position of dropdown menu

            $('[data-toggle="dropdown"]').dropdown({
                offsetFn: function(data) {
                    data.left = -100;
                    return data
                }
            });

[romanlex]

When use this code found maybe bug in Popper.js(( Cannot set offset.left more when element width but can set any negative values. Maybe it's logic of Popper

PS
I check and confirm what offset.left cannot be more when reference width(button width)

[romanlex]

I think what better send all popper params, because it's more customizable solution and can change more settings of Popper

_getOffset(data) {
  const popperOffset = $.extend({}, data.offsets, this._config.offsetFn(data.offsets) || {})
  Object.keys(popperOffset).forEach((key) => {
    data.offsets[key] = popperOffset[key]
  })
  return data
}

With this code and this bind

const dropdownMegaToggle = $('.dropdown-toggle--mega');
dropdownMegaToggle.dropdown({
    offsetFn: function(data) {
        let popper = data.popper;
        let reference = data.reference;
        let w = $(window).width();
        let buttonOffset = dropdownMegaToggle.offset();
        popper.top = 100;
        reference.width = w / 2; // f*cking Popper.js crutch
        popper.left = w / 2 - popper.width / 2 - buttonOffset.left;
        return data
    }
});

Now I can change dropdown position

[Johann-S]

Please do not commit dist files, you must revert this change

[Johann-S]

No need for an new option here, just check if offset is a function or not

[Johann-S]

you have unrelated changes here and their...

[Johann-S]

Why did you closed your PR @romanlex ?

[romanlex]

@Johann-S big thx for your reply and thx for what you teach and say how to properly make changes.
I tried to correct your comments and made a new one PR

[Johann-S]

Ok 😃 you're welcome 😉 but you can just update this one
I made an issue related to that PR #24223

[romanlex]

I don't now ) How I can close this PR?