Bootstrap Alert - show then hide - cannot show again

I have a simple hidden dismissible bootstrap alert:

<div id="selectedAssets" class="alert alert-info text-center alert-dismissible" role="alert" style="display:none">
  <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
  <div id="selectedAssetsDetails"> </div>
</div>

<button type="button" id="getSelectedAssets" class="btn btn-primary">Show Selected Assets</button>

A button is set to run a script that displays the hidden alert:

$("#selectedAssetsDetails").html('Selected Assets: '+values);
$("#selectedAssets").show();

This works successfully the first time to show the alert, but if the user closes the alert it won't display the alert again by clicking the button to show the alert. I assumed:

$("#selectedAssets").show();

would always show the alert?