add data-secure to form, closes #2907

Closes #2907

Merge request studip/studip!1961

lib/classes/forms/Form.php

@@ -22,6 +22,7 @@ class Form extends Part
     protected $success_message = '';
 
     protected $collapsable = false;
+    protected $data_secure = true;
 
     //to identify a form element
     protected $id = null;
@@ -276,6 +277,21 @@ class Form extends Part
         return $this;
     }
 
+    /**
+     * Sets if the form should be secured against accidental leaving of the page. Standard is on.
+     * @param $data_secure
+     * @return $this
+     */
+    public function setDataSecure($data_secure)
+    {
+        $this->data_secure = $data_secure;
+        return $this;
+    }
+
+    public function getDataSecure() {
+        return $this->data_secure;
+    }
+
     /**
      * Sets the ID if this form. This ID is only relevant for plugins to identify this Form object.
      * @param string|null $id

templates/forms/form.php

@@ -22,6 +22,7 @@ $form_id = md5(uniqid());
       <? endif ?>
       @submit="submit"
       novalidate
+      <?= $form->getDataSecure() ? 'data-secure' : '' ?>
       id="<?= htmlReady($form_id) ?>"
       data-inputs="<?= htmlReady(json_encode($inputs)) ?>"
       data-debugmode="<?= htmlReady(json_encode($form->getDebugMode())) ?>"