Add dynamic loading

src/components/SingleAutocompleteSelectField/SingleAutocompleteSelectField.stories.tsx

@@ -6,10 +6,14 @@ import { maybe } from "@saleor/misc";
 import CardDecorator from "@saleor/storybook/CardDecorator";
 import Decorator from "@saleor/storybook/Decorator";
 import { ChoiceProvider } from "@saleor/storybook/mock";
+import createSingleAutocompleteSelectHandler from "@saleor/utils/handlers/singleAutocompleteSelectChangeHandler";
 import { countries } from "./fixtures";
 import SingleAutocompleteSelectField, {
   SingleAutocompleteSelectFieldProps
 } from "./SingleAutocompleteSelectField";
+import SingleAutocompleteSelectFieldContent, {
+  SingleAutocompleteSelectFieldContentProps
+} from "./SingleAutocompleteSelectFieldContent";
 
 const suggestions = countries.map(c => ({ label: c.name, value: c.code }));
 
@@ -20,11 +24,16 @@ const props: SingleAutocompleteSelectFieldProps = {
   loading: false,
   name: "country",
   onChange: () => undefined,
-  placeholder: "Select country"
+  placeholder: "Select country",
+  value: suggestions[0].value
 };
 
 const Story: React.FC<
-  Partial<SingleAutocompleteSelectFieldProps>
+  Partial<
+    SingleAutocompleteSelectFieldProps & {
+      enableLoadMore: boolean;
+    }
+  >
 > = storyProps => {
   const [displayValue, setDisplayValue] = React.useState(suggestions[0].label);
 
@@ -32,14 +41,12 @@ const Story: React.FC<
     <Form initial={{ country: suggestions[0].value }}>
       {({ change, data }) => (
         <ChoiceProvider choices={suggestions}>
-          {({ choices, loading, fetchChoices }) => {
-            const handleSelect = (event: React.ChangeEvent<any>) => {
-              const value: string = event.target.value;
-              const match = choices.find(choice => choice.value === value);
-              const label = maybe(() => match.label, value);
-              setDisplayValue(label);
-              change(event);
-            };
+          {({ choices, fetchChoices, fetchMore, hasMore, loading }) => {
+            const handleSelect = createSingleAutocompleteSelectHandler(
+              change,
+              setDisplayValue,
+              choices
+            );
 
             return (
               <SingleAutocompleteSelectField
@@ -48,9 +55,11 @@ const Story: React.FC<
                 choices={choices}
                 fetchChoices={fetchChoices}
                 helperText={`Value: ${data.country}`}
+                loading={loading}
                 onChange={handleSelect}
                 value={data.country}
-                loading={loading}
+                hasMore={storyProps.enableLoadMore ? hasMore : false}
+                onFetchMore={storyProps.enableLoadMore ? fetchMore : undefined}
                 {...storyProps}
               />
             );
@@ -61,9 +70,35 @@ const Story: React.FC<
   );
 };
 
-storiesOf("Generics / SingleAutocompleteSelectField", module)
+const contentProps: SingleAutocompleteSelectFieldContentProps = {
+  choices: suggestions.slice(0, 10),
+  displayCustomValue: false,
+  emptyOption: false,
+  getItemProps: () => undefined,
+  hasMore: false,
+  highlightedIndex: 0,
+  inputValue: suggestions[0].label,
+  isCustomValueSelected: false,
+  loading: false,
+  onFetchMore: () => undefined,
+  selectedItem: suggestions[0].value
+};
+
+storiesOf("Generics / Select with autocomplete", module)
   .addDecorator(CardDecorator)
   .addDecorator(Decorator)
-  .add("with loaded data", () => <Story />)
-  .add("with loading data", () => <Story loading={true} />)
-  .add("with custom option", () => <Story allowCustomValues={true} />);
+  .add("default", () => (
+    <SingleAutocompleteSelectFieldContent {...contentProps} />
+  ))
+  .add("can load more", () => (
+    <SingleAutocompleteSelectFieldContent {...contentProps} hasMore={true} />
+  ))
+  .add("no data", () => (
+    <SingleAutocompleteSelectFieldContent {...contentProps} choices={[]} />
+  ))
+  .add("interactive", () => <Story />)
+  .add("interactive with custom option", () => (
+    <Story allowCustomValues={true} />
+  ))
+  .add("interactive with empty option", () => <Story emptyOption={true} />)
+  .add("interactive with load more", () => <Story enableLoadMore={true} />);

src/components/SingleAutocompleteSelectField/SingleAutocompleteSelectField.tsx

@@ -1,5 +1,4 @@
 import { Omit } from "@material-ui/core";
-import CircularProgress from "@material-ui/core/CircularProgress";
 import { InputProps } from "@material-ui/core/Input";
 import { createStyles, withStyles, WithStyles } from "@material-ui/core/styles";
 import TextField from "@material-ui/core/TextField";
@@ -11,6 +10,7 @@ import SingleAutocompleteSelectFieldContent, {
 } from "./SingleAutocompleteSelectFieldContent";
 
 import useStateFromProps from "@saleor/hooks/useStateFromProps";
+import { FetchMoreProps } from "@saleor/types";
 import ArrowDropdownIcon from "../../icons/ArrowDropdown";
 import Debounce, { DebounceProps } from "../Debounce";
 
@@ -21,15 +21,15 @@ const styles = createStyles({
   }
 });
 
-export interface SingleAutocompleteSelectFieldProps {
+export interface SingleAutocompleteSelectFieldProps
+  extends Partial<FetchMoreProps> {
   error?: boolean;
   name: string;
   displayValue: string;
   emptyOption?: boolean;
   choices: SingleAutocompleteChoiceType[];
-  value?: string;
+  value: string;
   disabled?: boolean;
-  loading?: boolean;
   placeholder?: string;
   allowCustomValues?: boolean;
   helperText?: string;
@@ -61,6 +61,7 @@ const SingleAutocompleteSelectFieldComponent = withStyles(styles, {
     displayValue,
     emptyOption,
     error,
+    hasMore,
     helperText,
     label,
     loading,
@@ -70,6 +71,7 @@ const SingleAutocompleteSelectFieldComponent = withStyles(styles, {
     InputProps,
     fetchChoices,
     onChange,
+    onFetchMore,
     ...props
   }: SingleAutocompleteSelectFieldProps & WithStyles<typeof styles>) => {
     const [prevDisplayValue] = useStateFromProps(displayValue);
@@ -132,11 +134,7 @@ const SingleAutocompleteSelectFieldComponent = withStyles(styles, {
                       }),
                       endAdornment: (
                         <div>
-                          {loading ? (
-                            <CircularProgress size={20} />
-                          ) : (
-                            <ArrowDropdownIcon onClick={toggleMenu} />
-                          )}
+                          <ArrowDropdownIcon onClick={toggleMenu} />
                         </div>
                       ),
                       error,
@@ -156,10 +154,13 @@ const SingleAutocompleteSelectFieldComponent = withStyles(styles, {
                       displayCustomValue={displayCustomValue}
                       emptyOption={emptyOption}
                       getItemProps={getItemProps}
+                      hasMore={hasMore}
                       highlightedIndex={highlightedIndex}
+                      loading={loading}
                       inputValue={inputValue}
                       isCustomValueSelected={isCustomValueSelected}
                       selectedItem={selectedItem}
+                      onFetchMore={onFetchMore}
                     />
                   )}
                 </div>
@@ -208,4 +209,5 @@ export class SingleAutocompleteSelectField extends React.Component<
     );
   }
 }
+
 export default SingleAutocompleteSelectField;

src/components/SingleAutocompleteSelectField/SingleAutocompleteSelectFieldContent.tsx

@@ -1,3 +1,4 @@
+import CircularProgress from "@material-ui/core/CircularProgress";
 import MenuItem from "@material-ui/core/MenuItem";
 import Paper from "@material-ui/core/Paper";
 import { Theme } from "@material-ui/core/styles";
@@ -9,16 +10,19 @@ import React from "react";
 import { FormattedMessage } from "react-intl";
 
 import useElementScroll from "@saleor/hooks/useElementScroll";
+import { FetchMoreProps } from "@saleor/types";
 import Hr from "../Hr";
 
 const menuItemHeight = 46;
 const maxMenuItems = 5;
+const offset = 24;
 
 export interface SingleAutocompleteChoiceType {
   label: string;
   value: any;
 }
-interface SingleAutocompleteSelectFieldContentProps {
+export interface SingleAutocompleteSelectFieldContentProps
+  extends Partial<FetchMoreProps> {
   choices: SingleAutocompleteChoiceType[];
   displayCustomValue: boolean;
   emptyOption: boolean;
@@ -43,6 +47,11 @@ const useStyles = makeStyles(
       height: "auto",
       whiteSpace: "normal"
     },
+    progress: {},
+    progressContainer: {
+      display: "flex",
+      justifyContent: "center"
+    },
     root: {
       borderRadius: 4,
       left: 0,
@@ -52,7 +61,9 @@ const useStyles = makeStyles(
       zIndex: 22
     },
     shadow: {
-      boxShadow: `0px -5px 10px 0px ${theme.palette.grey[800]}`
+      "&$shadowLine": {
+        boxShadow: `0px -5px 10px 0px ${theme.palette.grey[800]}`
+      }
     },
     shadowLine: {
       boxShadow: `0px 0px 0px 0px ${theme.palette.grey[50]}`,
@@ -89,21 +100,38 @@ const SingleAutocompleteSelectFieldContent: React.FC<
     displayCustomValue,
     emptyOption,
     getItemProps,
+    hasMore,
     highlightedIndex,
+    loading,
     inputValue,
     isCustomValueSelected,
-    selectedItem
+    selectedItem,
+    onFetchMore
   } = props;
 
   const classes = useStyles(props);
   const anchor = React.useRef<HTMLDivElement>();
   const scrollPosition = useElementScroll(anchor);
+  const [calledForMore, setCalledForMore] = React.useState(false);
 
-  const dropShadow = anchor.current
-    ? scrollPosition.y + anchor.current.clientHeight <
+  const scrolledToBottom = anchor.current
+    ? scrollPosition.y + anchor.current.clientHeight + offset >=
       anchor.current.scrollHeight
     : false;
 
+  React.useEffect(() => {
+    if (!calledForMore && onFetchMore && scrolledToBottom) {
+      onFetchMore();
+      setCalledForMore(true);
+    }
+  }, [scrolledToBottom]);
+
+  React.useEffect(() => {
+    if (calledForMore && !loading) {
+      setCalledForMore(false);
+    }
+  }, [loading]);
+
   return (
     <Paper className={classes.root} square>
       <div className={classes.content} ref={anchor}>
@@ -172,6 +200,14 @@ const SingleAutocompleteSelectFieldContent: React.FC<
                 </MenuItem>
               );
             })}
+            {hasMore && (
+              <>
+                <Hr className={classes.hr} />
+                <div className={classes.progressContainer}>
+                  <CircularProgress className={classes.progress} size={24} />
+                </div>
+              </>
+            )}
           </>
         ) : (
           <MenuItem
@@ -185,7 +221,7 @@ const SingleAutocompleteSelectFieldContent: React.FC<
       </div>
       <div
         className={classNames(classes.shadowLine, {
-          [classes.shadow]: dropShadow
+          [classes.shadow]: !scrolledToBottom
         })}
       />
     </Paper>

src/components/SingleAutocompleteSelectField/index.ts

@@ -1,2 +1,3 @@
 export { default } from "./SingleAutocompleteSelectField";
 export * from "./SingleAutocompleteSelectField";
+export * from "./SingleAutocompleteSelectFieldContent";

src/storybook/CardDecorator.tsx

@@ -7,6 +7,7 @@ const CardDecorator = storyFn => (
     style={{
       margin: "auto",
       overflow: "visible",
+      position: "relative",
       width: 400
     }}
   >

src/storybook/mock.tsx

@@ -1,36 +1,41 @@
 import React from "react";
 
+import { SingleAutocompleteChoiceType } from "@saleor/components/SingleAutocompleteSelectField/SingleAutocompleteSelectFieldContent";
+
 interface ChoiceProviderProps {
   children: (props: {
-    choices: Array<{
-      label: string;
-      value: string;
-    }>;
+    choices: SingleAutocompleteChoiceType[];
+    hasMore: boolean;
     loading: boolean;
-    fetchChoices(value: string);
+    fetchChoices: (value: string) => void;
+    fetchMore: () => void;
   }) => React.ReactElement<any>;
-  choices: Array<{
-    label: string;
-    value: string;
-  }>;
+  choices: SingleAutocompleteChoiceType[];
 }
 interface ChoiceProviderState {
-  choices: Array<{
-    label: string;
-    value: string;
-  }>;
+  choices: SingleAutocompleteChoiceType[];
+  filteredChoices: SingleAutocompleteChoiceType[];
+  first: number;
   loading: boolean;
   timeout: any;
 }
 
+const step = 5;
+
 export class ChoiceProvider extends React.Component<
   ChoiceProviderProps,
   ChoiceProviderState
 > {
-  state = { choices: [], loading: false, timeout: null };
+  state = {
+    choices: [],
+    filteredChoices: [],
+    first: step,
+    loading: false,
+    timeout: null
+  };
 
   handleChange = (inputValue: string) => {
-    if (this.state.loading) {
+    if (!!this.state.timeout) {
       clearTimeout(this.state.timeout);
     }
     const timeout = setTimeout(() => this.fetchChoices(inputValue), 500);
@@ -40,16 +45,35 @@ export class ChoiceProvider extends React.Component<
     });
   };
 
-  fetchChoices = (inputValue: string) => {
+  handleFetchMore = () => {
+    if (!!this.state.timeout) {
+      clearTimeout(this.state.timeout);
+    }
+    const timeout = setTimeout(this.fetchMore, 500);
     this.setState({
-      choices: this.props.choices
-        .filter(
-          suggestion =>
-            !inputValue ||
-            suggestion.label.toLowerCase().indexOf(inputValue.toLowerCase()) !==
-              -1
-        )
-        .slice(0, 10),
+      loading: true,
+      timeout
+    });
+  };
+
+  fetchMore = () =>
+    this.setState(prevState => ({
+      filteredChoices: prevState.choices.slice(0, prevState.first + step),
+      first: prevState.first + step,
+      loading: false,
+      timeout: null
+    }));
+
+  fetchChoices = (inputValue: string) => {
+    const choices = this.props.choices.filter(
+      suggestion =>
+        !inputValue ||
+        suggestion.label.toLowerCase().indexOf(inputValue.toLowerCase()) !== -1
+    );
+    this.setState({
+      choices,
+      filteredChoices: choices.slice(0, step),
+      first: step,
       loading: false,
       timeout: null
     });
@@ -57,8 +81,10 @@ export class ChoiceProvider extends React.Component<
 
   render() {
     return this.props.children({
-      choices: this.state.choices,
+      choices: this.state.filteredChoices,
       fetchChoices: this.handleChange,
+      fetchMore: this.handleFetchMore,
+      hasMore: this.state.choices.length > this.state.filteredChoices.length,
       loading: this.state.loading
     });
   }