Change the select2 dropdown from single select to allow for multiple selections

I am dealing with a complex control that contains 10 to 12 select2 dropdowns. These dropdowns need to be initialized as select2 dropdowns, and when they are opened, an ajax call is made to load data. The issue arises when specific data is loaded from the server - in this case, the drop-down should become a multiple select2.

Below is a snippet of the code:

$selectDropDown.select2({
    ajax: {
        url: '/GetValues',
        dataType: 'json',
        data: function (params) {
            var query = {
                title: name,
            }

            return query;
        },
        processResults: function (data) {
            if (data.type === '10') {

               // Code to make it multiple select goes here
               return {results: data.results};
            } else {
               var values = getDefaultDataItems();
               return {results: values };
            }

        }
    },
    allowClear: true,
    placeholder: 'Select values'
    width: '100%',
});

The data cannot be loaded before initialization of select2 due to optimization reasons.

Currently, it functions like this:

 processResults: function (data) {
            if (data.type === '10') {

               // A workaround approach
               $selectDropDown.select2({
                        multiple: 'multiple',
                        data: data.results
                    }).select2('open');
            } else {
               var values = getDefaultDataItems();
               return {results: values };
            }
        }

I would like to inquire if this is the best way to handle this situation? Is there a built-in functionality for this?

Answer №1

To optimize the functionality, I prefer to include the multiple attribute in my select element and change the attribute name to an array format. Then, simply invoke .select2(); on the select element.

For instance, if I have a select element with the class of sub-type.

$('.sub-type').prop('multiple', true).attr('name', 'sub_type[]').select2();

If you need to revert back to a single select option, here's how you can do it:

$('.sub-type').prop('multiple', false).attr('name', 'sub_type').select2();

I apologize for the delay in responding, as I just came across your query today. Hopefully, my explanation will benefit others as well.

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