Select component do not display with specific CSS class

I've created a form inside a page node type with 4 components :

• markup
• select
• email
• textarea

All components but select are enclosed in a div tag with specific CSS class and id in HTML rendering :

• webform-component-markup for markup
• webform-component-email for email
• webform-component-textarea for textarea

With such CSS data, adding some javascript behaviour is quite easy. For example show or hide a component is done by applying jQuery function on the desired CSS class :

$(.webform-component-textarea)
.add(.webform-component-email)
.hide();

Lack of the same representation for select component make this task more complex. Furthermore this behavior is not the same as for the other components and may add confusion.