extranet/application/views/default/scripts/saisie/liendoc.phtml

<fieldset>
<legend>Documents</legend>
<div class="fieldgrp">
<label>Type :</label>
<div class="field">
<select name="type">
<option value="greffeactes">Greffe - Actes</option>
<option value="greffesbilans">Greffe - Bilans</option>
<option value="sendfile">Envoyer un fichier</option>
</select>
</div>
</div>

<div id="greffe" style="display:none;"></div>

<div id="sendfile" style="display:none;">

<div class="fieldgrp">
<label>Fichier :</label>
<div class="field">
<input type="file" name="fichier" />
</div>
</div>

<div class="fieldgrp">
<label>Date du document ou date de cloture de l'exercice :</label>
<div class="field">
<input type="text" name="dateSaisie" value="" /> (JJ/MM/AAAAA)
</div>
</div>

</div>

</fieldset>
<script>
$('select[name=type]').on('change', function(e){
    e.preventDefault();
    switch () {

    }
    
	
});
</script>