sorted options only when selecting again

react-openapi/components/FilterBar.tsx

@@ -11,6 +11,63 @@ import DoneIcon from "@mui/icons-material/Done";
 import FilterListIcon from "@mui/icons-material/FilterList";
 import { ResourceField, ResourceMode } from "../types/config";
 
+function FilterAutocomplete({
+  options,
+  value,
+  label,
+  onChange,
+}: {
+  options: string[];
+  value: string[];
+  label: string;
+  onChange: (val: string[]) => void;
+}) {
+  const listboxRef = React.useRef<HTMLUListElement>(null);
+  const scrollPosRef = React.useRef(0);
+  const [frozenValue, setFrozenValue] = React.useState<string[]>(value);
+
+  const sortedOptions = React.useMemo(() => {
+    const sel = new Set(frozenValue);
+    const picked: string[] = [];
+    const rest: string[] = [];
+    for (const o of options) {
+      if (sel.has(o)) picked.push(o);
+      else rest.push(o);
+    }
+    return [...picked, ...rest];
+  }, [options, frozenValue]);
+
+  return (
+    <Autocomplete
+      multiple
+      freeSolo
+      disableCloseOnSelect
+      limitTags={1}
+      options={sortedOptions}
+      value={value}
+      getOptionKey={(option) => option}
+      onChange={(_, val) => onChange(val.length > 0 ? val : [])}
+      onOpen={() => setFrozenValue(value)}
+      onClose={() => setFrozenValue(value)}
+      ListboxProps={{
+        ref: listboxRef,
+        onScroll: (e) => { scrollPosRef.current = (e.target as HTMLUListElement).scrollTop; },
+      }}
+      renderOption={(props, option, { selected }) => {
+        const { key, ...rest } = props;
+        return (
+          <li key={key} {...rest}>
+            {selected ? <DoneIcon sx={{ fontSize: 14, mr: 1, color: 'primary.main' }} /> : <Box sx={{ width: 22, mr: 1 }} />}
+            {option}
+          </li>
+        );
+      }}
+      renderInput={(params) => <TextField {...params} placeholder={`Add ${label}...`} />}
+      sx={{ '& .MuiOutlinedInput-root': { minHeight: '3rem', py: 0.5 } }}
+    />
+  );
+}
+
 function extractOptions(
   fieldName: string,
   field: ResourceField,
@@ -94,35 +151,13 @@ function renderFilterInput(
   }
 
   const selected = Array.isArray(value) ? value : [];
-  // const sortedOptions = React.useMemo(() => {
-  //   const sel = new Set(selected);
-  //   const picked: string[] = [];
-  //   const rest: string[] = [];
-  //   for (const o of options) {
-  //     if (sel.has(o)) picked.push(o);
-  //     else rest.push(o);
-  //   }
-  //   return [...picked, ...rest];
-  // }, [options, selected]);
 
   return (
-    <Autocomplete
-      multiple
-      freeSolo
-      disableCloseOnSelect
-      limitTags={1}
-      value={selected}
-      // options={sortedOptions}
+    <FilterAutocomplete
       options={options}
-      onChange={(_, val) => onChange("value", val.length > 0 ? val : undefined)}
-      renderOption={(props, option, { selected }) => (
-        <li {...props}>
-          {selected ? <DoneIcon sx={{ fontSize: 14, mr: 1, color: 'primary.main' }} /> : <Box sx={{ width: 22, mr: 1 }} />}
-          {option}
-        </li>
-      )}
-      renderInput={(params) => <TextField {...params} placeholder={`Add ${field.label}...`} />}
-      sx={{ '& .MuiOutlinedInput-root': { minHeight: '3rem', py: 0.5 } }}
+      value={selected}
+      label={field.label}
+      onChange={(val) => onChange("value", val.length > 0 ? val : undefined)}
     />
   );
 }