I am using Twitter Bootstrap 3.1.1 with Parsley v2.0.0-rc3. I made it mostly work apart from classHandler option. 
I have HTML like this:
<div class="form-group">
    <label class="control-label" for="username">User Name</label>
    <input class="form-control" id="username" name="username" required="" type="text" value="">   
</div>
And run Parsley like this:
$("#register_form").parsley({
    successClass: "has-success",
    errorClass: "has-error",
    classHandler: function(el) {
        return $(el).closest(".form-group");
    },
    errorsWrapper: "<span class='help-block'></span>",
    errorTemplate: "<span></span>"
});
Everything works fine, but success / error classes are applied to wrong element. After the page is loaded, I get this:
<div class="form-group">
    <label class="control-label" for="username">User Name</label>
    <input class="form-control" id="username" name="username" required="" type="text" value="" data-parsley-id="5043">
    <span class="help-block" id="parsley-id-5043"></span>
</div>
And when validated, the result is this:
<div class="form-group">
    <label class="control-label" for="username">User Name</label>
    <input class="form-control has-error" id="username" name="username" required="" type="text" value="" data-parsley-id="5043">
    <span class="help-block filled" id="parsley-id-5043">
        <span class="parsley-required">This value is required.</span>
    </span>
</div>
However, I expect something different:
<div class="form-group has-error">
    <label class="control-label" for="username">User Name</label>
    <input class="form-control" id="username" name="username" required="" type="text" value="" data-parsley-id="5043">
    <span class="help-block filled" id="parsley-id-5043">
        <span class="parsley-required">This value is required.</span>
    </span>
</div>
I have verified using alert that the function runs. But I am new to jQuery and JavaScript, so I do not know how to debug it any further and fix it.
 
     
    