Bootstrap data-toggle collapses div after second click, not first

Question

I have the simple example with Bootstrap and toggling divs by click. Here is markup:

<div class="accordion-heading">
    <a class="accordion-toggle"
       data-toggle="collapse"
       data-parent="#accordion2"
       href="#collapseOne">Open!</a>
</div>
<div id="collapseOne" class="accordion-body">
    <div class="span6">
        <div class="well well-small">
            <div class="accordion-toggle">
                ...some text...
            </div>
        </div>
    </div>
    <div class="span2"></div>                            
</div>

When user clixks link with title 'Open!' underlying div expands or collapses. Div is expanded initially and when user clicks first time it has no effect. Then if user clicks second time, div collapses.

In the original example div is collapsed initially but I would like it to be opened. How could I fix the problem?

Answer 1

I had this problem, and in my case I had foolishly inserted two "class" attributes in the div I wanted to collapse like so:

<div class="something" id="mydiv" class="collapse in"> <div>

The browser seems to eliminate the second class attribute instead of merging them.

My problem was fixed by "merging" together the two class attributes:

<div id="mydiv" class="something collapse in"> <div>

Answer 2

<a class="btn btn-primary" data-toggle="collapse" href="#collapsePanel" role="button" aria-expanded="false" aria-controls="collapsePanel">Collapse</a>

<div id="collapsePanel" class="collapse show"><!-- Content Here --></div>

This will make it collapsible, but show the panel by default. When you click the Collapse button, it will collapse the panel on the first click.

I'm only adding this here for if anyone is looking to do it either way. I found this link when searching for its inverse. Hope it helps!