show build version in html

rust/src_webpack/src/ota.ts

@@ -33,5 +33,23 @@ export function uploadFile() {
   ajax.send(file);
 }
 
+interface VersionInfo{
+  git_hash:string,
+  build_time: string
+}
+
 let file1Upload = document.getElementById("file1") as HTMLInputElement;
 file1Upload.onchange = uploadFile;
+
+let firmware_buildtime = document.getElementById("firmware_buildtime") as HTMLDivElement;
+let firmware_githash = document.getElementById("firmware_githash") as HTMLDivElement;
+
+document.addEventListener('DOMContentLoaded', function() {
+  fetch("/version")
+  .then(response => response.json())
+  .then(json => json as VersionInfo)
+  .then(versionInfo => {
+    firmware_buildtime.innerText = versionInfo.build_time;
+    firmware_githash.innerText = versionInfo.git_hash;
+  })
+}, false);