fix missing preview button when editing .md gist (#259)

Co-authored-by: Dennis Sumser <[email protected]>

public/editor.ts

@@ -36,8 +36,17 @@ document.addEventListener("DOMContentLoaded", () => {
 
  let mdpreview = dom.querySelector(".md-preview") as HTMLElement;
 
+ let formfilename = dom.querySelector<HTMLInputElement>(".form-filename");
+
+ // check if file ends with .md on pageload
+ if (formfilename!.value.endsWith(".md")) {
+ mdpreview!.classList.remove("hidden");
+ } else {
+ mdpreview!.classList.add("hidden");
+ }
+
  // event if the filename ends with .md; trigger event
- dom.querySelector<HTMLInputElement>(".form-filename")!.onkeyup = (e) => {
+ formfilename!.onkeyup = (e) => {
  let filename = (e.target as HTMLInputElement).value;
  if (filename.endsWith(".md")) {
  mdpreview!.classList.remove("hidden");