Select2 and initSelection callback

Question

On page load, I'm trying to use initSelection to select ID 60 (specified value of the input field). I can't seem to get it to work properly.

The PHP scripts work great and return the correct values, but how do I get the JS to do the callback correctly?

JavaScript:

$(document).ready(function() {
    $('#editAlbumArtistId').select2({
            placeholder: 'Search names',
            ajax: {
                url: "/jQueryScripts/jQuerySelectListArtists.php",
                dataType: 'json',
                quietMillis: 100,
                data: function (term, page) {
                    return {
                        term: term, //search term
                        page_limit: 10 // page size
                    };
                },
                results: function (data, page) {
                    return {results: data.results};
                }

            },
            initSelection: function(element, callback) {

            var id = $(element).val();
            if(id !== "") {
                $.ajax("/jQueryScripts/jQuerySelectListArtists.php", {
                    data: {id: id},
                    dataType: "json"
                }).done(function(data) {
                    callback(data);
                });
            }
        }
    });
});

HTML:

<p>
    <input type='hidden' value="60" data-init-text='Search names' name='editAlbumArtistId' id='editAlbumArtistId' style="width:180px;"/>
</p>

Every time I refresh the page, I see that the PHP script gets executed and that it returns the proper ID and text. However, the field isn't updated and I've seriously tried everything I can think of.

I'm using Select2 3.4.3.

Any help would be greatly appreciated.

Answer 1

Finally solved it! I figured select2 didn't want an array since it's a single value, so I selected the first element of the data.results array.

callback(data.results[0]);

And if you have set multiple:true, just accept the entire results array;

callback(data.results);

Answer 2

You could also use this for less code:

    initSelection: function(element, callback) {
        return $.getJSON("/jQueryScripts/jQuerySelectListArtists.php?id=" + element.val(), null, function(data) {
            return callback(data[0]);
        });
    }

I saw this example in the Select2 wiki, but i had to deal with callback(data) vs callback(data[0]) like you did.