Bootstrap Modal Issue - Scrolling Gets Disabled

I have a modal and within that modal, there is a dropdown that displays large hidden content, which is working.

Now when you open the next modal, stacked on top of the first modal and dismiss it, the scrolling on modal underneath becomes disabled.

I have created a full example, including the steps to replicate the issue I am facing. You can see it here.

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <link href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
    <title></title>
    <style>

    </style>
</head>
<body>


    <input type="button" data-toggle="modal" data-target="#modal_1" class="btn btn-lg btn-primary" value="Open Modal 1" >

    <div class="modal fade" id="modal_1">
        <div class="modal-dialog modal-sm">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
                    <h4 class="modal-title">First Modal</h4>
                </div>
                <div class="modal-body">



                    <form class="form">

                        <div class="form-group">
                            <label>1) Open This First: </label>
                            <input type="button" data-toggle="modal" data-target="#modal_2" class="btn btn-primary" value="Open Modal 2" >
                        </div>

                        <div class="form-group">
                            <label>2) Change this once you have opened the modal above.</label>
                            <select id="change" class="form-control">
                                <option value="small">Show Small Content</option>
                                <option value="large">Show Large Content</option>
                            </select>
                        </div> 

                        <div id="large" class='content-div'>
                            <label>Large Textarea Content.. Try and scroll to the bottom..</label>
                            <textarea rows="30" class="form-control"></textarea>

                        </div>

                        <div id="small" class='content-div'>
                            <label> Example Text Box</label> 
                            <input type="text" class="form-control">
                        </div>  


                    </form>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                </div>
            </div>
        </div>
    </div>


    <div class="modal fade" id="modal_2">
        <div class="modal-dialog modal-sm">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
                    <h4 class="modal-title">Second Modal</h4>
                </div>
                <div class="modal-body">

                    <hp>This is the stacked modal.. Close this modal, then chenge the dropdown menu, you cannot scroll... </h5>

                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                </div>
            </div>
        </div>
    </div>


</body>
<script src="http://code.jquery.com/jquery-1.11.0.min.js" type="text/javascript"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js" type="text/javascript"></script>
<script>

    $(document).ready(function() {


        $(".content-div").hide();
        $("#change").change(function() {
            $(".content-div").hide();
            $("#" + $(this).val()).show();
        });


    });

</script>
</html>

Here's a Bootply to show the behaviour in action:

Bootply

This is also a solution

.modal {
  overflow-y:auto;
}

http://www.bootply.com/LZBqdq2jl5

Auto works fine :) This will actually fix any modal that runs higher than your screen size.

This is because when you close a modal, it removes the modal-open from the <body> tag. Bootstrap doesn't support multiple modals on the same page (At least until BS3).

One way to make it work, is to use the hidden.bs.modal event triggered by BS when closing a modal, then check if there is anyother modal open in order to force the modal-open class on the body.

// Hack to enable multiple modals by making sure the .modal-open class
// is set to the <body> when there is at least one modal open left
$('body').on('hidden.bs.modal', function () {
    if($('.modal.in').length > 0)
    {
        $('body').addClass('modal-open');
    }
});

I have found a solution for you. I'm not sure why it doesn't work but just one line code in your CSS will solve the problem. After closing second modal, the first one are getting overflow-y:hidden somehow. Even if its set to auto actually.

You need to rewrite this and set your own declaration in CSS:

#modal_1 {
    overflow-y:scroll;
}

Here you have a working DEMO

Edit: wrong link, sorry.

Bootstrap Modal Issue - Scrolling Gets Disabled

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