Select2 allowClear not working with dynamic dropdown list

Issue

I have tried a lot of ways to fix this problem.

At a dynamic list loaded via ajax, I can't make allowClear work.

Here is my jsFiddle

HTML:

<select id="first" class="init-select2" data-placeholder="First dropdown" data-allowclear="true">
    <option></option>
    <option>First option</option>
    <option>Second option</option>
</select>
<select id="second" class="init-select2" data-placeholder="Second Dropdown" data-allowclear="true" disabled="disabled">
    <option></option>
</select>

Javascript:

$(function() {
    $('.init-select2').removeClass('init-select2').each(function(){
            if ($(this).attr("data-allowclear") && $(this).attr("data-allowclear") == "true"){
                $(this).select2({
                    allowClear: true
                });
            } else if ($(this).attr("data-allowclear") && $(this).attr("data-allowclear") == "false") {
                $(this).select2({
                    allowClear: false
                });
            }
        });

    $('#first').change(function () {
        var options = [];
        $.ajax({
            type: "POST",
            url: "/echo/json/",
            data: {"json":JSON.stringify({"one":"first","two":"second","three":"third"})},
            cache: false,

            success: function(data) {
                $.each(data, function (index, value) {
                    options.push("<option>" + value + "</option>");
                    $("#second").find('option').remove().end().append(options).attr("disabled", false).select2({ allowClear: true });
                });
            }
        }); 
    });
});

in jsfiddle are already added the select2 javascript and css, please have a look there

Solution

Fixed by adding an "<option></option>" to second dropdown each time I change the value of first dropdown. See success handler below:

$('#first').change(function () {
    var options = [];
    $.ajax({
        type: "POST",
        url: "/echo/json/",
        data: {
            "json": JSON.stringify({
                "one": "first",
                "two": "second",
                "three": "third"
            })
        },
        cache: false,

        success: function (data) {
            options.push("<option></option>");
            $.each(data, function (index, value) { 
                options.push("<option>" + value + "</option>");
                $("#second").find('option').remove().end().append(options).attr("disabled", false).select2({
                    allowClear: true
                });
            });
        }
    });
});

Answered By - smotru