Fix upload file form (#33230) (#33233)

Backport #33230 by @wxiaoguang

Fix #33228

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/repo-editor.ts

@@ -38,9 +38,6 @@ export function initRepoEditor() {
   const dropzoneUpload = document.querySelector<HTMLElement>('.page-content.repository.editor.upload .dropzone');
   if (dropzoneUpload) initDropzone(dropzoneUpload);
 
-  const editArea = document.querySelector<HTMLTextAreaElement>('.page-content.repository.editor textarea#edit_area');
-  if (!editArea) return;
-
   for (const el of queryElems<HTMLInputElement>(document, '.js-quick-pull-choice-option')) {
     el.addEventListener('input', () => {
       if (el.value === 'commit-to-new-branch') {
@@ -55,6 +52,7 @@ export function initRepoEditor() {
   }
 
   const filenameInput = document.querySelector<HTMLInputElement>('#file-name');
+  if (!filenameInput) return;
   function joinTreePath() {
     const parts = [];
     for (const el of document.querySelectorAll('.breadcrumb span.section')) {
@@ -144,6 +142,10 @@ export function initRepoEditor() {
     }
   });
 
+  // on the upload page, there is no editor(textarea)
+  const editArea = document.querySelector<HTMLTextAreaElement>('.page-content.repository.editor textarea#edit_area');
+  if (!editArea) return;
+
   const elForm = document.querySelector<HTMLFormElement>('.repository.editor .edit.form');
   initEditPreviewTab(elForm);