Create bootstrap select picker dynamically

Answer 1

You need to append the <select /> you create to the DOM before calling selectpicker() on it, something like this:

var $select = $('<select/>', {
     'class':"selectpicker"
});
for (var idx in data) {
    $select.append('<option value=' + data[idx].id + '>' + data[idx].Text + '</option>');
}

$select.appendTo('#myElement').selectpicker('refresh');

Note the use of append(), and also the removal of hasOwnProperty - you're already looping through the properties of the object so that method call is redundant.