[openstreetmap/openstreetmap-website] Add datalist to display multiple search results (PR #6765)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



>      endpoint.setValue(value);
   }
 
-  endpoint.setValue = function (value) {
+  function findDatalistOption(value) {
+    const options = datalist[0].querySelectorAll("option");
+    for (const option of options) {
+      if (option.value === value) {
+        return option;
+      }
+    }
+    return null;

Or if we're already using jquery:
```javascript
return datalist
  .find("option")
  .get()
  .find(option => option.value === value)
```

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