move date selection to workflow

backend/app/plugins/wiaas/assets/css/wiaas-admin-delivery-process.css

@@ -0,0 +1,15 @@
+.delivery-process {
+    background-color: #777;
+    color: white;
+    cursor: pointer;
+    padding: 18px;
+    width: 100%;
+    border: none;
+    text-align: left;
+    outline: none;
+    font-size: 15px;
+  }
+  
+  .delivery-process:hover {
+    background-color: #555;
+  }

backend/app/plugins/wiaas/assets/js/wiaas-admin-delivery-process.js

@@ -0,0 +1,23 @@
+jQuery(document).ready(function($) {
+
+    $('#delivery-process-selector').change(function(e){
+        e.preventDefault();
+        
+        var data = {
+            action: 'wiaas_create_order_delivery_process',
+            _ajax_nonce: $('#wiaas_create_order_delivery_process_nonce').val(),
+            order: $('#wiaas_order_id').val(),
+            form: e.target.value
+
+        };
+
+        // since 2.8 ajaxurl is always defined in the admin header and points to admin-ajax.php
+        $.post(ajaxurl, data, function(response) {
+            if (response.success){
+                location.reload();
+            }else{
+                alert(response.data[0].message);
+            }
+        });
+    });
+});