[MultiSelect] Enable pasting of multiple values (same as TagInput)

packages/core/src/components/tag-input/tagInput.tsx

@@ -15,6 +15,17 @@ import * as Utils from "../../common/utils";
 import { Icon, IconName } from "../icon/icon";
 import { ITagProps, Tag } from "../tag/tag";
 
+/**
+ * A type reflecting the manner in which a `TagInput` value was added.
+ * - `"default"` - indicates that a value was added in the default fasion, via
+ *   manual selection.
+ * - `"blur"` - indicates that a value was added when the `TagInput` lost focus.
+ *   This is only possible when `addOnBlur=true`.
+ * - `"paste"` - indicates that a value was added via paste. This is only
+ *   possible when `addOnPaste=true`.
+ */
+export type TagInputAddMethod = "default" | "blur" | "paste";
+
 export interface ITagInputProps extends IIntentProps, IProps {
     /**
      * If true, `onAdd` will be invoked when the input loses focus.
@@ -74,7 +85,7 @@ export interface ITagInputProps extends IIntentProps, IProps {
      * returns `false`. This is useful if the provided `value` is somehow invalid and should
      * not be added as a tag.
      */
-    onAdd?: (values: string[]) => boolean | void;
+    onAdd?: (values: string[], method: TagInputAddMethod) => boolean | void;
 
     /**
      * Callback invoked when new tags are added or removed. Receives the updated list of `values`:
@@ -260,10 +271,10 @@ export class TagInput extends AbstractPureComponent<ITagInputProps, ITagInputSta
         );
     }
 
-    private addTags = (value: string) => {
+    private addTags = (value: string, method: TagInputAddMethod = "default") => {
         const { inputValue, onAdd, onChange, values } = this.props;
         const newValues = this.getValues(value);
-        let shouldClearInput = Utils.safeInvoke(onAdd, newValues) !== false && inputValue === undefined;
+        let shouldClearInput = Utils.safeInvoke(onAdd, newValues, method) !== false && inputValue === undefined;
         // avoid a potentially expensive computation if this prop is omitted
         if (Utils.isFunction(onChange)) {
             shouldClearInput = onChange([...values, ...newValues]) !== false && shouldClearInput;
@@ -342,7 +353,7 @@ export class TagInput extends AbstractPureComponent<ITagInputProps, ITagInputSta
             // defer this check using rAF so activeElement will have updated.
             if (!currentTarget.contains(document.activeElement)) {
                 if (this.props.addOnBlur && this.state.inputValue !== undefined && this.state.inputValue.length > 0) {
-                    this.addTags(this.state.inputValue);
+                    this.addTags(this.state.inputValue, "blur");
                 }
                 this.setState({ activeIndex: NONE, isInputFocused: false });
             }
@@ -367,7 +378,7 @@ export class TagInput extends AbstractPureComponent<ITagInputProps, ITagInputSta
         let activeIndexToEmit = activeIndex;
 
         if (event.which === Keys.ENTER && value.length > 0) {
-            this.addTags(value);
+            this.addTags(value, "default");
         } else if (selectionEnd === 0 && this.props.values.length > 0) {
             // cursor at beginning of input allows interaction with tags.
             // use selectionEnd to verify cursor position and no text selection.
@@ -405,7 +416,7 @@ export class TagInput extends AbstractPureComponent<ITagInputProps, ITagInputSta
         }
 
         event.preventDefault();
-        this.addTags(value);
+        this.addTags(value, "paste");
     };
 
     private handleRemoveTag = (event: React.MouseEvent<HTMLSpanElement>) => {

packages/docs-app/src/examples/select-examples/films.tsx

@@ -152,8 +152,15 @@ export const renderCreateFilmOption = (
     />
 );
 
-export const filterFilm: ItemPredicate<IFilm> = (query, film) => {
-    return `${film.rank}. ${film.title.toLowerCase()} ${film.year}`.indexOf(query.toLowerCase()) >= 0;
+export const filterFilm: ItemPredicate<IFilm> = (query, film, _index, exactMatch) => {
+    const normalizedTitle = film.title.toLowerCase();
+    const normalizedQuery = query.toLowerCase();
+
+    if (exactMatch) {
+        return normalizedTitle === normalizedQuery;
+    } else {
+        return `${film.rank}. ${normalizedTitle} ${film.year}`.indexOf(normalizedQuery) >= 0;
+    }
 };
 
 function highlightText(text: string, query: string) {
@@ -210,6 +217,10 @@ export function areFilmsEqual(filmA: IFilm, filmB: IFilm) {
     return filmA.title.toLowerCase() === filmB.title.toLowerCase();
 }
 
+export function doesFilmEqualQuery(film: IFilm, query: string) {
+    return film.title.toLowerCase() === query.toLowerCase();
+}
+
 export function arrayContainsFilm(films: IFilm[], filmToFind: IFilm): boolean {
     return films.some((film: IFilm) => film.title === filmToFind.title);
 }

packages/docs-app/src/examples/select-examples/multiSelectExample.tsx

@@ -13,6 +13,7 @@ import {
     areFilmsEqual,
     arrayContainsFilm,
     createFilm,
+    doesFilmEqualQuery,
     filmSelectProps,
     IFilm,
     maybeAddCreatedFilmToArrays,
@@ -93,6 +94,7 @@ export class MultiSelectExample extends React.PureComponent<IExampleProps, IMult
                     items={this.state.items}
                     noResults={<MenuItem disabled={true} text="No results." />}
                     onItemSelect={this.handleFilmSelect}
+                    onItemsPaste={this.handleFilmsPaste}
                     popoverProps={{ minimal: popoverMinimal }}
                     tagRenderer={this.renderTag}
                     tagInputProps={{ tagProps: getTagProps, onRemove: this.handleTagRemove, rightElement: clearButton }}
@@ -180,20 +182,29 @@ export class MultiSelectExample extends React.PureComponent<IExampleProps, IMult
     }
 
     private selectFilm(film: IFilm) {
-        const { films } = this.state;
+        this.selectFilms([film]);
+    }
 
-        const { createdItems: nextCreatedItems, items: nextItems } = maybeAddCreatedFilmToArrays(
-            this.state.items,
-            this.state.createdItems,
-            film,
-        );
+    private selectFilms(filmsToSelect: IFilm[]) {
+        const { createdItems, films, items } = this.state;
 
-        this.setState({
-            createdItems: nextCreatedItems,
+        let nextCreatedItems = createdItems.slice();
+        let nextFilms = films.slice();
+        let nextItems = items.slice();
+
+        filmsToSelect.forEach(film => {
+            const results = maybeAddCreatedFilmToArrays(nextItems, nextCreatedItems, film);
+            nextItems = results.items;
+            nextCreatedItems = results.createdItems;
             // Avoid re-creating an item that is already selected (the "Create
             // Item" option will be shown even if it matches an already selected
             // item).
-            films: !arrayContainsFilm(films, film) ? [...films, film] : films,
+            nextFilms = !arrayContainsFilm(nextFilms, film) ? [...nextFilms, film] : nextFilms;
+        });
+
+        this.setState({
+            createdItems: nextCreatedItems,
+            films: nextFilms,
             items: nextItems,
         });
     }
@@ -224,6 +235,12 @@ export class MultiSelectExample extends React.PureComponent<IExampleProps, IMult
         }
     };
 
+    private handleFilmsPaste = (films: IFilm[]) => {
+        // On paste, don't bother with deselecting already selected values, just
+        // add the new ones.
+        this.selectFilms(films);
+    };
+
     private handleSwitchChange(prop: keyof IMultiSelectExampleState) {
         return (event: React.FormEvent<HTMLInputElement>) => {
             const checked = event.currentTarget.checked;

packages/select/src/common/listItemsProps.ts

@@ -66,11 +66,21 @@ export interface IListItemsProps<T> extends IProps {
     itemListPredicate?: ItemListPredicate<T>;
 
     /**
-     * Customize querying of individual items. Return `true` to keep the item, `false` to hide.
-     * This method will be invoked once for each item, so it should be performant. For more complex
-     * queries, use `itemListPredicate` to operate once on the entire array.
+     * Customize querying of individual items.
      *
-     * This prop is ignored if `itemListPredicate` is also defined.
+     * __Filtering a list of items.__ This function is invoked to filter the
+     * list of items as a query is typed. Return `true` to keep the item, or
+     * `false` to hide. This method is invoked once for each item, so it should
+     * be performant. For more complex queries, use `itemListPredicate` to
+     * operate once on the entire array. For the purposes of filtering the list,
+     * this prop is ignored if `itemListPredicate` is also defined.
+     *
+     * __Matching a pasted value to an item.__ This function is also invoked to
+     * match a pasted value to an existing item if possible. In this case, the
+     * function will receive `exactMatch=true`, and the function should return
+     * true only if the item _exactly_ matches the query. For the purposes of
+     * matching pasted values, this prop will be invoked even if
+     * `itemListPredicate` is defined.
      */
     itemPredicate?: ItemPredicate<T>;
 
@@ -130,6 +140,11 @@ export interface IListItemsProps<T> extends IProps {
      */
     onItemSelect: (item: T, event?: React.SyntheticEvent<HTMLElement>) => void;
 
+    /**
+     * Callback invoked when multiple items are selected at once via pasting.
+     */
+    onItemsPaste?: (items: T[]) => void;
+
     /**
      * Callback invoked when the query string changes.
      */

packages/select/src/common/predicate.ts

@@ -14,10 +14,20 @@
 export type ItemListPredicate<T> = (query: string, items: T[]) => T[];
 
 /**
- * Customize querying of individual items. Return `true` to keep the item, `false` to hide.
- * This method will be invoked once for each item, so it should be performant. For more complex
- * queries, use `itemListPredicate` to operate once on the entire array.
+ * Customize querying of individual items.
  *
- * If defined with `itemListPredicate`, this prop will be ignored.
+ * __Filtering a list of items.__ This function is invoked to filter the list of
+ * items as a query is typed. Return `true` to keep the item, or `false` to
+ * hide. This method is invoked once for each item, so it should be performant.
+ * For more complex queries, use `itemListPredicate` to operate once on the
+ * entire array. For the purposes of filtering the list, this prop is ignored if
+ * `itemListPredicate` is also defined.
+ *
+ * __Matching a pasted value to an item.__ This function is also invoked to
+ * match a pasted value to an existing item if possible. In this case, the
+ * function will receive `exactMatch=true`, and the function should return true
+ * only if the item _exactly_ matches the query. For the purposes of matching
+ * pasted values, this prop will be invoked even if `itemListPredicate` is
+ * defined.
  */
-export type ItemPredicate<T> = (query: string, item: T, index?: number) => boolean;
+export type ItemPredicate<T> = (query: string, item: T, index?: number, exactMatch?: boolean) => boolean;

packages/select/src/components/query-list/queryList.tsx

@@ -54,6 +54,24 @@ export interface IQueryListRendererProps<T>  // Omit `createNewItem`, because it
      */
     handleItemSelect: (item: T, event?: React.SyntheticEvent<HTMLElement>) => void;
 
+    /**
+     * Handler that should be invoked when the user pastes one or more values.
+     *
+     * This callback will use `itemPredicate` with `exactMatch=true` to find a
+     * subset of `items` exactly matching the pasted `values` provided, then it
+     * will invoke `onItemsPaste` with those found items. Each pasted value that
+     * does not exactly match an item will be ignored.
+     *
+     * If creating items is enabled (by providing both `createNewItemFromQuery`
+     * and `createNewItemRenderer`), then pasted values that do not exactly
+     * match an existing item will emit a new item as created via
+     * `createNewItemFromQuery`.
+     *
+     * If `itemPredicate` returns multiple matching items for a particular
+     * `value`, then only the first matching item will be emitted.
+     */
+    handlePaste: (values: string[]) => void;
+
     /**
      * Keyboard handler for up/down arrow keys to shift the active item.
      * Attach this handler to any element that should support this interaction.
@@ -152,6 +170,7 @@ export class QueryList<T> extends React.Component<IQueryListProps<T>, IQueryList
             handleItemSelect: this.handleItemSelect,
             handleKeyDown: this.handleKeyDown,
             handleKeyUp: this.handleKeyUp,
+            handlePaste: this.handlePaste,
             handleQueryChange: this.handleQueryChange,
             itemList: itemListRenderer({
                 ...spreadableState,
@@ -350,6 +369,40 @@ export class QueryList<T> extends React.Component<IQueryListProps<T>, IQueryList
         }
     };
 
+    private handlePaste = (values: string[]) => {
+        const { createNewItemFromQuery, onItemsPaste } = this.props;
+
+        let nextActiveItem: T | undefined;
+
+        // Find an exising item that exactly matches each pasted value, or
+        // create a new item if possible. Ignore unmatched values if creating
+        // items is disabled.
+        const pastedItemsToEmit = values.reduce<T[]>((agg, value) => {
+            const equalItem = getMatchingItem(value, this.props);
+
+            if (equalItem !== undefined) {
+                nextActiveItem = equalItem;
+                agg.push(equalItem);
+            } else if (this.canCreateItems()) {
+                const newItem = Utils.safeInvoke(createNewItemFromQuery, value);
+                if (newItem !== undefined) {
+                    agg.push(newItem);
+                }
+            }
+
+            return agg;
+        }, []);
+
+        // UX nicety: update the active item if we matched with at least one
+        // existing item.
+        if (nextActiveItem !== undefined) {
+            this.setActiveItem(nextActiveItem);
+        }
+
+        // No need to update the active item.
+        Utils.safeInvoke(onItemsPaste, pastedItemsToEmit);
+    };
+
     private handleKeyDown = (event: React.KeyboardEvent<HTMLElement>) => {
         const { keyCode } = event;
         if (keyCode === Keys.ARROW_UP || keyCode === Keys.ARROW_DOWN) {
@@ -418,10 +471,8 @@ export class QueryList<T> extends React.Component<IQueryListProps<T>, IQueryList
     }
 
     private isCreateItemRendered(): boolean {
-        const { createNewItemFromQuery } = this.props;
         return (
-            createNewItemFromQuery != null &&
-            this.props.createNewItemRenderer != null &&
+            this.canCreateItems() &&
             this.state.query !== "" &&
             // this check is unfortunately O(N) on the number of items, but
             // alas, hiding the "Create Item" option when it exactly matches an
@@ -430,6 +481,10 @@ export class QueryList<T> extends React.Component<IQueryListProps<T>, IQueryList
         );
     }
 
+    private canCreateItems(): boolean {
+        return this.props.createNewItemFromQuery != null && this.props.createNewItemRenderer != null;
+    }
+
     private wouldCreatedItemMatchSomeExistingItem() {
         // search only the filtered items, not the full items list, because we
         // only need to check items that match the current query.
@@ -443,6 +498,20 @@ function pxToNumber(value: string | null) {
     return value == null ? 0 : parseInt(value.slice(0, -2), 10);
 }
 
+function getMatchingItem<T>(query: string, { items, itemPredicate }: IQueryListProps<T>): T | undefined {
+    if (Utils.isFunction(itemPredicate)) {
+        // .find() doesn't exist in ES5. Alternative: use a for loop instead of
+        // .filter() so that we can return as soon as we find the first match.
+        for (let i = 0; i < items.length; i++) {
+            const item = items[i];
+            if (itemPredicate(query, item, i, true)) {
+                return item;
+            }
+        }
+    }
+    return undefined;
+}
+
 function getFilteredItems<T>(query: string, { items, itemPredicate, itemListPredicate }: IQueryListProps<T>) {
     if (Utils.isFunction(itemListPredicate)) {
         // note that implementations can reorder the items here

packages/select/src/components/select/multiSelect.tsx

@@ -14,6 +14,7 @@ import {
     Popover,
     Position,
     TagInput,
+    TagInputAddMethod,
     Utils,
 } from "@blueprintjs/core";
 import { Classes, IListItemsProps } from "../../common";
@@ -92,7 +93,13 @@ export class MultiSelect<T> extends React.PureComponent<IMultiSelectProps<T>, IM
 
     private renderQueryList = (listProps: IQueryListRendererProps<T>) => {
         const { tagInputProps = {}, popoverProps = {}, selectedItems = [], placeholder } = this.props;
-        const { handleKeyDown, handleKeyUp } = listProps;
+        const { handlePaste, handleKeyDown, handleKeyUp } = listProps;
+
+        const handleTagInputAdd = (values: any[], method: TagInputAddMethod) => {
+            if (method === "paste") {
+                handlePaste(values);
+            }
+        };
 
         return (
             <Popover
@@ -117,6 +124,7 @@ export class MultiSelect<T> extends React.PureComponent<IMultiSelectProps<T>, IM
                         className={classNames(Classes.MULTISELECT, tagInputProps.className)}
                         inputRef={this.refHandlers.input}
                         inputValue={listProps.query}
+                        onAdd={handleTagInputAdd}
                         onInputChange={listProps.handleQueryChange}
                         values={selectedItems.map(this.props.tagRenderer)}
                     />