Bootstrap modal in MVC, double backdrop - backdrop appearing twice

Question

I noticed an issue when spawning a bootstrap modal using jQuery. Adding further javascript within the dynamically spawned partial view (my modal) causes a double backdrop to appear. Anyone know why this happens? I'm using jquery-1.8.2.js and Bootstrap v3.1.1. Many thanks.

App.js

$(document).ready(function () {

$('.modal-button').on('click', function (e) {
    // Remove existing modals.
    $('.modal').remove();
    $.ajax({
        url: '/Ajax/GetSearchModal/',
        type: "get",
        cache: false,
        success: function (data) {
            var modal = $(data);
            $(data).modal({
                backdrop: 'static',
                keyboard: false,
            });
        }
    });
});

});

The partial view (my modal)

@model MVCApp.Web.Models.ModalSearchModel
<div id="Ajax-Modal" class="modal fade" aria-hidden="true" role="dialog">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <h3>
                    Select Something
                </h3>
            </div>
            @using (Html.BeginForm(Model.Action, Model.Controller, FormMethod.Post))
            { 
            <div class="modal-body">
                @Html.HiddenFor(m => m.SelectedDropDownID, new { @class     = "select-something-ddl", style = "width:100%", placeholder = "Search..." })
            </div>
            <div class="modal-footer">
                <button type="submit" value="Continue">Continue</button>
                <button type="button" value="Cancel" data-dismiss="modal">Cancel</button>
            </div>
            }
        </div>
    </div>
</div>
<script type="text/javascript">
    $(document).ready(function () {

        // This here causes the drop backdrop

        // select2 code here
    });
</script>

UPDATE

Moving the javascript from the modal to the success handler didn't work for what I'm trying to achieve. I wish to fire up the select2 drop down list. The only way I could get it to work in the success handler was with the following:

            modal.on('shown.bs.modal', function () {
                $('#SelectedDropDownID').select2({
                    ajax: {
                        url: '/Ajax/FetchResults/',
                        dataType: 'json',
                        delay: 250,
                        data: function (searchTerm) {
                            return { query: searchTerm };
                        },
                        results: function (data) {
                            return { results: data };
                        }
                    },
                    minimumInputLength: 2,
                    formatResult: formatRepo,
                    formatSelection: formatRepoSelection
                });

            });

However, there is a delay in the select2 activating because the shown event doesn't fire until the modal has completed animating into the screen. If I run the code outside of the shown event, select2 never activates.

SOLVED

Huge thanks to both Pasha Zavoiskikh and cvrebert. I had to update Bootstrap and jQuery to fixed the double backdrop. Further to Pasha's comment, appending the modal to the body before calling select2 fixed select2 not firing. Here is the complete fix:

function formatRepo(item) {
    var markup = "<table class='item-result'><tr>";
    if (item.text !== undefined) {
        markup += "<div class='item-name' data-jtext=" + item.text + " data-jid=" + item.id + ">" + item.text + "</div>";
    }
    markup += "</td></tr></table>"
    return markup;
}

function formatRepoSelection(item) {
    return item.text;
}


$('.modal-button).on('click', function (e) {
    // Delete existing modals.
    $('.modal').replaceWith('');
    // Get modal.
    $.ajax({
        url: '/Ajax/GetSearchModal/',
        type: "get",
        cache: false,
        success: function (data) {
            var modal = $(data);
            $('body').append(modal);
            $('#SelectedDropDownID').select2({
                ajax: {
                    url: '/Ajax/FetchResults/',
                    dataType: 'json',
                    delay: 250,
                    data: function (searchTerm) {
                        return { query: searchTerm };
                    },
                    results: function (data) {
                        return { results: data };
                    }
                },
                minimumInputLength: 2,
                formatResult: formatRepo,
                formatSelection: formatRepoSelection
            });

            modal.modal({
                backdrop: 'static',
                keyboard: false,
            });
        }
    });
});

Answer 1

This is an old post i came across as this issue is still there in Bootstrap, giving my inputs to help people who come after me.

Issue - single Div with class "modal-backdrop" still remains after closing the modal.

1) Add class btn-close to both the close buttons:-

<div class="modal fade" id="myModal">
    <div class="modal-dialog">
      <div class="modal-content">

        <!-- Modal Header -->
        <div class="modal-header">
          <h4 class="modal-title">Modal Heading</h4>
          <button type="button"  class="close btn-close" data-dismiss="modal">&times;</button>
        </div>

        <!-- Modal body -->
        <div class="modal-body">
          Modal body..
        </div>

        <!-- Modal footer -->
        <div class="modal-footer">
          <button type="button"  class="btn btn-danger btn-close" data-dismiss="modal">Close</button>
        </div>

      </div>
    </div>
</div>

2) Add this Jquery at the bottom of the page :-

$(document).ready(function(){
        $('.btn-close').click(function(){
             $(".modal-backdrop").remove();
        });
 });