diff --git a/mouvements/sorties/_calcul_dispo.html b/mouvements/sorties/_calcul_dispo.html
new file mode 100644
index 0000000..2591d77
--- /dev/null
+++ b/mouvements/sorties/_calcul_dispo.html
@@ -0,0 +1,9 @@
+    {{* cumuler les entrées et les sorties de ce matériel *}}
+    {{:assign var="dispo" value=0}}
+    {{#load type="movement" where="$$.equipment = :eqpmt_key" :eqpmt_key=$equipment.key assign="movement"}}
+      {{if $movement.direction === 'entrée'}}
+        {{:assign dispo="%d+%d"|math:$dispo:$movement.amount}}
+      {{else}}
+        {{:assign dispo="%d-%d"|math:$dispo:$movement.amount}}
+      {{/if}}
+    {{/load}}
diff --git a/mouvements/sorties/stock_disponible.html b/mouvements/sorties/stock_disponible.html
index 3faffb8..133b505 100644
--- a/mouvements/sorties/stock_disponible.html
+++ b/mouvements/sorties/stock_disponible.html
@@ -15,6 +15,14 @@
         {{#load type="equipment" key=$_POST.equipment assign="equipment"}}
         {{/load}}
 
+        {{* TODO vérifier si qté sortie <= dispo *}}
+        {{:include file="./_calcul_dispo.html" keep="dispo" }}
+
+        {{* cumuler les entrées et les sorties de ce matériel *}}
+        {{if $_POST.quantite|intval > $dispo}}
+                {{:error message="Erreur : la quantité indiquée (%s) est supérieure à celle disponible (%d)"|args:$_POST.quantite:$dispo}}
+        {{/if}}
+
         {{* Enregistrer le mouvement *}}
         {{:assign mvt_key=""|uuid}}
         {{:assign var="operation" from="types_sorties.%d|args:$_POST.type_operation}}
@@ -41,19 +49,13 @@
   {{:assign nom_cat=$category.name}}
 
   {{#load type="equipment" where="$$.category = :key" :key=$category.key assign="equipment" order="$$.designation"}}
-    {{:assign var="dispo" value=0}}
 
     {{* cumuler les entrées et les sorties de ce matériel *}}
-    {{#load type="movement" where="$$.equipment = :eqpmt_key" :eqpmt_key=$equipment.key assign="movement"}}
-      {{if $movement.direction === 'entrée'}}
-        {{:assign dispo="%d+%d"|math:$dispo:$movement.amount}}
-      {{else}}
-        {{:assign dispo="%d-%d"|math:$dispo:$movement.amount}}
-      {{/if}}
-    {{else}}
-        {{:error message="pas de mouvement pour la clé=%s"|args:$equipment.key}}
-    {{/load}}
-    {{:assign var="equipments.%s.%s"|args:$nom_cat:$equipment.key value="%s (dispo : %d)"|args:$equipment.designation:$dispo}}
+    {{:include file="./_calcul_dispo.html" keep="dispo" }}
+
+    {{if $dispo > 0}}
+        {{:assign var="equipments.%s.%s"|args:$nom_cat:$equipment.key value="%s (dispo : %d)"|args:$equipment.designation:$dispo}}
+    {{/if}}
   {{/load}}
 {{/load}}
 
@@ -65,20 +67,32 @@
     <legend>Ajouter une sortie d'un matériel disponible en stock</legend>
     {{:input type="select" name="type_operation" label="Type" required=true options=$types_sorties}}
     {{:input type="date" name="date" label="Date de sortie" required=true default=$now|date_short}}
-    {{:input type="number" name="quantite" label="Quantité" required=true default=1}}
+    {{:input type="number" name="quantite" label="Quantité" required=true default=1 min=1}}
 
     <fieldset>
       <legend>Matériel</legend>
-      {{:input type="select_groups" name="equipment" label="Matériel" required=true options=$equipments}}
-      {{:input type="textarea" name="remarques" label="Remarques" cols="40", rows="3" required=false}}
+      {{:input type="select_groups" name="equipment" label="Matériel" required=true options=$equipments onchange="fixerValeurMax('f_equipment', 'f_quantite')"}}
+      {{:input type="textarea" name="remarques" label="Remarques" cols="40" rows="3" required=false}}
     </fieldset>
   </fieldset>
 
   <p class="submit">
     {{:button type="submit" name="save" label="Enregistrer" shape="right" class="main"}}
-    {{* :button type="submit" name="cancel" label="Annuler" shape="delete" class="main" *}}
   </p>
 
 </form>
 
+<script type="text/javascript">
+  // fixer la valeur maximale du champ de saisie de la quantité
+  function fixerValeurMax(idSelect, idNumber) {
+    let option = document.getElementById(idSelect).selectedOptions[0];
+    let max = parseInt(option.label.match(/\(dispo : ([0-9]+)\)/)[1]);
+    let val = parseInt(document.getElementById(idNumber).value);
+    document.getElementById(idNumber).setAttribute("max", max);
+    if (val > max) {
+      document.getElementById(idNumber).value = max;
+    }
+  }
+</script>
+
 {{:admin_footer}}