From ab54d0c620a8ff72506da937d1951fbd52cb7a97 Mon Sep 17 00:00:00 2001
From: Lukas Eichenauer <leichenauer@databay.de>
Date: Wed, 28 Jan 2026 16:21:47 +0100
Subject: [PATCH] fix(ui/40605): use additional load code to intercept button
 id for file input label

---
 .../Component/Input/Field/Renderer.php        | 19 +++++++++++--------
 .../Component/Input/Field/FileInputTest.php   |  8 ++++----
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/components/ILIAS/UI/src/Implementation/Component/Input/Field/Renderer.php b/components/ILIAS/UI/src/Implementation/Component/Input/Field/Renderer.php
index 7c731d09bfd6..eac4002c29f2 100755
--- a/components/ILIAS/UI/src/Implementation/Component/Input/Field/Renderer.php
+++ b/components/ILIAS/UI/src/Implementation/Component/Input/Field/Renderer.php
@@ -909,19 +909,22 @@ protected function renderFileField(F\File $input, RendererInterface $default_ren
         $input = $this->initClientsideFileInput($input);
 
         // display the action button (to choose files).
-        $template->setVariable('ACTION_BUTTON', $default_renderer->render(
-            $this->getUIFactory()->button()->shy(
-                $input->getMaxFiles() <= 1
-                    ? $this->txt('select_file_from_computer')
-                    : $this->txt('select_files_from_computer'),
-                '#'
-            )
-        ));
+        $button_id = null;
+        $button = $this->getUIFactory()->button()->shy(
+            $input->getMaxFiles() <= 1
+                ? $this->txt('select_file_from_computer')
+                : $this->txt('select_files_from_computer'),
+            '#'
+        )->withAdditionalOnLoadCode(static function (string $id) use (&$button_id) {
+            $button_id = $id;
+        });
+        $template->setVariable('ACTION_BUTTON', $default_renderer->render($button));
 
         return $this->wrapInFormContext(
             $input,
             $input->getLabel(),
             $template->get(),
+            $button_id
         );
     }
 
diff --git a/components/ILIAS/UI/tests/Component/Input/Field/FileInputTest.php b/components/ILIAS/UI/tests/Component/Input/Field/FileInputTest.php
index 4d8a24a2b145..688ef6493129 100755
--- a/components/ILIAS/UI/tests/Component/Input/Field/FileInputTest.php
+++ b/components/ILIAS/UI/tests/Component/Input/Field/FileInputTest.php
@@ -176,7 +176,7 @@ class="ui-input-file-input-error-msg" data-dz-error-msg></span></div>
             </div>
             ',
             $byline,
-            null,
+            'id_2',
             'id_3'
         );
         $this->assertEquals($expected, $this->render($file_input));
@@ -260,7 +260,7 @@ class="ui-input-file-input-error-msg" data-dz-error-msg></span></div>
             </div>
             ',
             null,
-            null,
+            'id_3',
             'id_4'
         );
         $this->assertEquals($expected, $this->render($file_input));
@@ -346,7 +346,7 @@ class="c-field-text" /></div>
             </div>
             ',
             null,
-            null,
+            'id_5',
             'id_6',
         );
         $this->assertEquals($expected, $this->render($file_input));
@@ -441,7 +441,7 @@ class="c-field-text" /></div>
             </div>
             ',
             null,
-            null,
+            'id_5',
             'id_6'
         );
         $this->assertEquals($expected, $this->render($file_input));