Select2 off（'change'）。on（'change'...）无法更改所选选项

Question

I use Select2-4.0.0 And

$gameSelect.select2().on("change",function(e){....}

works fine.

But when I chain it following off('change') like:

$gameSelect.select2().off('change').on("change",function(e){....}

The event is triggered but the selected item does not change at UI.

Why is that?

Answer 1

Looks like the select2-4.0 is adding its own change handlers to the select element, when you say off('change') that too is getting removed that is the reason.

To fix this kind of problems we have event name spacing so, use a namespace to your handlers and use it to remove them like

$('#my-select').select2().off('change.mychange').on('change.mychange', function () {
    //your code
});

Demo: Fiddle

Answer 2

To preserve the settings of select2 , use this code instead of the accepted solution :

$('#my-select').off('change.mychange').on('change.mychange', function () {
    //your code
});

You don't need to reinstatiate the .select2() . It's unnecessary and also shorter.