JQuery Select2 - How to select all options

Question

I\'m using jQuery select2 multi select dropdown. I need to select all options in a dropdown from code. Basically there is a Select All checkbox on which this functionality h

Answer 1

Please see below code.

$('.select2').select2({
    formatResult:function(object, container, query){
        if(object.id=='all' || object.id=='clear')
            return ' '+object.text+'';

        return object.text;
    }
});
$('.select2').on("change", function(e) {
    if($.inArray('all', e.val)===0){
        var selected = [];
        $(this).find("option").each(function(i,e){
            if($(e).attr("value")=='all' || $(e).attr("value")=='clear')
                return true;

            selected[selected.length]=$(e).attr("value");
        });
        $(this).select2('val',selected);
    }else if($.inArray('clear', e.val)===0){
        $(this).select2('val','');
    }
});

Reference from: https://github.com/select2/select2/issues/195#issuecomment-52163095