Bootstrap responsive grid layout (3 columns) with

I'm trying to make a 100% column appear beneath an element inside a coloumn of a bootstrap grid. Since it's easier to understand with pictures, here what I am trying to achieve:

When selecting one of the images (1 to x), a hidden div (with each different content) should appear beneath the image in the full 12 column size:

I managed to do this, however, when using a smaller resolution, this hidden div is displayed beneath the third element, and not beneath element 1. This is how it should be:

Would be glad for some help!

Here the code snippet of the actual version:

// hide all
	$('.descriptions .panel').hide();

	 // handle img click
	$('#grid img').click(function() {

	  // get index of the img that was clicked
	  var idx = $(this).parent().parent().parent().index();

	  var row = $(this).parent().parent().parent().parent().next('.row');

	  // remove special style from all others
	  $('#grid img').removeClass('highlight');

	  // add a special style to the clicked image
	  $(this).addClass('highlight');

	  // hide all others
	  $('.descriptions .panel').hide();

	  // show desc for clicked img
	  row.find('.descriptions .panel').eq(idx).show();

	});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<style>
.img-responsive{
	margin: 0 auto;
}
</style>
<!-- row 1 -->
<div class="row" id="grid">
	<div class="col-sm-4 portfolio-item">
		<figure class="gallery-item">
			<div class="img-title-text">
				<img class="img-responsive" src="http://placehold.it/250x250" style="opacity:0.1;" alt="">
				<span style="position: absolute; top: 25%; text-align: center;width: 95%; font-size: 20px;">text</span>
			</div>
		</figure>
	</div>
	<div class="col-sm-4 portfolio-item">
		<figure class="gallery-item">
			<div class="img-title-text">
				<img class="img-responsive" src="http://placehold.it/250x250" style="opacity:0.1;" alt="">
				<span style="position: absolute; top: 25%; text-align: center;width: 95%; font-size: 20px;">text</span>
			</div>
		</figure>
	</div>
	<div class="col-sm-4 portfolio-item">
		<figure class="gallery-item">
			<div class="img-title-text">
				<img class="img-responsive" src="http://placehold.it/250x250" style="opacity:0.1;" alt="">
				<span style="position: absolute; top: 25%; text-align: center;width: 95%; font-size: 20px;">text</span>
			</div>
		</figure>
	</div>
</div>

<!-- hidden row for images -->
<div class="row">
  <div class="col-md-12 descriptions">
	<div class="panel panel-default">
	 <div class="panel-body flex-grow">Content here for image 1.. Blah blah blah, blah blah. That is very interesting stuff. Aenean sit amet felis 
	  dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. </div>
	</div>
	<div class="panel panel-default">
	 <div class="panel-body flex-grow">Content here for image 2.. Blah blah blah, blah blah. That is very interesting stuff. Aenean sit amet felis 
	  dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. </div>
	</div>
	<div class="panel panel-default">
	 <div class="panel-body flex-grow">Content here for image 3.. Blah blah blah, blah blah. That is very interesting stuff. Aenean sit amet felis 
	  dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. </div>
	</div>
    
  </div>
</div>

<!-- row 2 -->
<div class="row" id="grid">
	<div class="col-sm-4 portfolio-item">
		<figure class="gallery-item">
			<div class="img-title-text">
				<img class="img-responsive" src="http://placehold.it/250x250" style="opacity:0.1;" alt="">
				<span style="position: absolute; top: 25%; text-align: center;width: 95%; font-size: 20px;">text</span>
			</div>
		</figure>
	</div>
	<div class="col-sm-4 portfolio-item">
		<figure class="gallery-item">
			<div class="img-title-text">
				<img class="img-responsive" src="http://placehold.it/250x250" style="opacity:0.1;" alt="">
				<span style="position: absolute; top: 25%; text-align: center;width: 95%; font-size: 20px;">text</span>
			</div>
		</figure>
	</div>
	<div class="col-sm-4 portfolio-item">
		<figure class="gallery-item">
			<div class="img-title-text">
				<img class="img-responsive" src="http://placehold.it/250x250" style="opacity:0.1;" alt="">
				<span style="position: absolute; top: 25%; text-align: center;width: 95%; font-size: 20px;">text</span>
			</div>
		</figure>
	</div>
</div>

<!-- hidden row for images of row 2 -->
<div class="row">
  <div class="col-md-12 descriptions">
	<div class="panel panel-default">
	 <div class="panel-body flex-grow">Content here for image 1.. Blah blah blah, blah blah. That is very interesting stuff. Aenean sit amet felis 
	  dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. </div>
	</div>
	<div class="panel panel-default">
	 <div class="panel-body flex-grow">Content here for image 2.. Blah blah blah, blah blah. That is very interesting stuff. Aenean sit amet felis 
	  dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. </div>
	</div>
	<div class="panel panel-default">
	 <div class="panel-body flex-grow">Content here for image 3.. Blah blah blah, blah blah. That is very interesting stuff. Aenean sit amet felis 
	  dolor, in sagittis nisi. Sed ac orci quis tortor imperdiet venenatis. </div>
	</div>
    
  </div>
</div>
[...]

回答1:

First, I would place the full width column under the appropriate image column in your markup so you get the desired layout on smaller screens.

Then you can adjust hidden row accordingly on larger screens using a @media query so that it's full width and overlays the parent row. For example, give the hidden rows the overlay class.

@media (min-width:992px) {
    .row {
        position:relative;
        padding: 30px;
    }
    .overlay {
      position: absolute;
      z-index:1;
      width: 100%;
      bottom: 0;
    }
}

You can use Bootstrap's collapse component to show/hide the hidden content.

Demo http://www.codeply.com/go/qhVNyUFOvj

回答2:

Have you tried putting a hidden div for each image directly underneath that image? If you use a Bootstrap collapsible underneath/right after each image, and you hide it, and then apply the functionality that you want, you should get what you're looking for. Is there a reason you can't/didn't want to use a separate <div> for each description?