Bootstrap Collapse - open the given id fragment

Answer 1

$("#accordionTwo").collapse('show');

To open the given HTTP fragment identifier, try this:

$(document).ready(function() {
    var anchor = window.location.hash;
    $(".collapse").collapse('hide');
    $(anchor).collapse('show');
});

EDIT:

As pointed by bart in the comments: be careful with targeting .collapse because this class is also used for the navigation bar when the viewport is xs.

Answer 2

For really simple and quick to implement hash routing, you could try something like Routie

routie({
    accordionOne: function() {
        $('#accordionOne').collapse('show');
    },
    accordionTwo: function() {
        $('#accordionTwo').collapse('show');
    },
    accordionThree: function() {
        $('#accordionThree').collapse('show');
    }
});

Answer 3

Yet another solution, a bit smaller and compact:

$(document).ready(function() {
  var anchor = window.location.hash;
  $(anchor).collapse('toggle');
});

Answer 4

This line will open the correct hash

location.hash && $(location.hash + '.collapse').collapse('show');