How can I change the width of a Bootstrap 3 modal

Question

I have to support IE8. The modal itself works fine, but my attempts to resize it (which work fine in Firefox) don't work in IE8.

I'm just adding a class (wide-modal in this example) to the modal-dialog div (the 2nd nested one in the Bootstrap structure) and applying a width via CSS, nothing fancy.

HTML:

       <div class="modal fade" id="modalTest" role="dialog">
            <div class="modal-dialog wide-modal">
              <div class="modal-content ">
                <div class="modal-header">
                  <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                  <h4 class="modal-title">Testing Modal</h4>
                </div>
                <div class="modal-body">
                  <img src="content/Example-Infographic.jpg" width="100%" />
                </div>
                <div class="modal-footer">
                  <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                </div>
              </div><!-- /.modal-content -->
            </div><!-- /.modal-dialog -->
        </div>

CSS:

.wide-modal {
    width: 60%;
}

I tried adding the class to the div above and below to no (positive) effect. It works like a charm where it is in Firefox, just no effect at all in IE8. I also tried with a px width, no difference. I do have the respond.js library in place so in general IE8 is behaving other than this.

Answer 1

This will of course change the width for all of your modal windows, but it might give you a better idea on how this works. I just changed my modal windows this way.

    .modal-body {
        position: relative;
        padding: 20px;
        min-width: 800px; /* SET THE WIDTH OF THE MODAL */
    }

    .modal-content {
        position: relative;
        background-color: #fff;
        border: 1px solid #999;
        border: 1px solid rgba(0,0,0,0.2);
        border-radius: 6px;
        outline: 0;
        -webkit-box-shadow: 0 3px 9px rgba(0,0,0,0.5);
        box-shadow: 0 3px 9px rgba(0,0,0,0.5);
        background-clip: padding-box;
        width: 900px; /* SET THE WIDTH OF THE MODAL */
        margin: 50px 0 0 -150px; /* CHANGE MARGINS TO ACCOMMODATE THE NEW WIDTH */
    }



<!-- Button trigger modal -->
  <a data-toggle="modal" href="#myModal" class="btn btn-primary btn-lg">Launch demo modal</a>

  <!-- Modal -->
  <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
          <h4 class="modal-title">Modal title</h4>
        </div>
        <div class="modal-body">
          ...
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
          <button type="button" class="btn btn-primary">Save changes</button>
        </div>
      </div><!-- /.modal-content -->
    </div><!-- /.modal-dialog -->
  </div><!-- /.modal -->

Answer 2

#modalTest.modal-dialog{
    width: <insert size> !important;
}
the !important is important :v

Answer 3

I think you need to set the width in pixels and adjust the margin-left. For example,

.modal-dialog {
    width:700px;
    margin-left:-320px;
}

The margin left must be half the width of the modal, minus 30px for the scrollbar.

Here's an example on Bootply: http://bootply.com/85213

Answer 4

I know it is late but just found in bs3 docs you can add modal-lg class to your modals

<!-- Large modal -->
<button class="btn btn-primary" data-toggle="modal" data-target=".bs-example-modal-lg">
  Large modal
</button>

<div class="modal fade bs-example-modal-lg" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel" aria-hidden="true">
  <div class="modal-dialog modal-lg">
    <div class="modal-content">
     ...
    </div>
  </div>
</div>

<!-- Small modal -->
<button class="btn btn-primary" data-toggle="modal" data-target=".bs-example-modal-sm">
  Small modal
</button>

<div class="modal fade bs-example-modal-sm" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
 <div class="modal-dialog modal-sm">
   <div class="modal-content">
     ...
   </div>
 </div>
</div>

Answer 5

In bootstrap 3 you need assign width not to .modal class but to .modal-dialog

#modalTest .modal-dialog
{
    width: 500px; /* your width */
}

Answer 6

I used a combination of CSS and jQuery, along with hints on this page, to create a fluid width and height using Bootstrap 3. I also tested this on IE8 on Win7, and it works great.

First, some CSS to handle the width and optional scrollbar for the content area

.modal.modal-wide .modal-dialog {
  width: 90%;
}
.modal-wide .modal-body {
  overflow-y: auto;
}

And then some jQuery to adjust the height of the content area if needed

$(".modal-wide").on("show.bs.modal", function() {
  var height = $(window).height() - 200;
  $(this).find(".modal-body").css("max-height", height);
});

Full write-up and code at http://scottpdawson.com/development/creating-a-variable-width-modal-dialog-using-bootstrap-3/