@angular/material
Version:
Angular Material
285 lines • 43.5 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { _isNumberValue } from '@angular/cdk/coercion';
import { DataSource } from '@angular/cdk/table';
import { BehaviorSubject, combineLatest, merge, of as observableOf, Subscription, Subject, } from 'rxjs';
import { map } from 'rxjs/operators';
/**
* Corresponds to `Number.MAX_SAFE_INTEGER`. Moved out into a variable here due to
* flaky browser support and the value not being defined in Closure's typings.
*/
const MAX_SAFE_INTEGER = 9007199254740991;
/**
* Data source that accepts a client-side data array and includes native support of filtering,
* sorting (using MatSort), and pagination (using MatPaginator).
*
* Allows for sort customization by overriding sortingDataAccessor, which defines how data
* properties are accessed. Also allows for filter customization by overriding filterTermAccessor,
* which defines how row data is converted to a string for filter matching.
*
* **Note:** This class is meant to be a simple data source to help you get started. As such
* it isn't equipped to handle some more advanced cases like robust i18n support or server-side
* interactions. If your app needs to support more advanced use cases, consider implementing your
* own `DataSource`.
*/
export class MatTableDataSource extends DataSource {
constructor(initialData = []) {
super();
/** Stream emitting render data to the table (depends on ordered data changes). */
this._renderData = new BehaviorSubject([]);
/** Stream that emits when a new filter string is set on the data source. */
this._filter = new BehaviorSubject('');
/** Used to react to internal changes of the paginator that are made by the data source itself. */
this._internalPageChanges = new Subject();
/**
* Subscription to the changes that should trigger an update to the table's rendered rows, such
* as filtering, sorting, pagination, or base data changes.
*/
this._renderChangesSubscription = Subscription.EMPTY;
/**
* Data accessor function that is used for accessing data properties for sorting through
* the default sortData function.
* This default function assumes that the sort header IDs (which defaults to the column name)
* matches the data's properties (e.g. column Xyz represents data['Xyz']).
* May be set to a custom function for different behavior.
* @param data Data object that is being accessed.
* @param sortHeaderId The name of the column that represents the data.
*/
this.sortingDataAccessor = (data, sortHeaderId) => {
const value = data[sortHeaderId];
if (_isNumberValue(value)) {
const numberValue = Number(value);
// Numbers beyond `MAX_SAFE_INTEGER` can't be compared reliably so we
// leave them as strings. For more info: https://goo.gl/y5vbSg
return numberValue < MAX_SAFE_INTEGER ? numberValue : value;
}
return value;
};
/**
* Gets a sorted copy of the data array based on the state of the MatSort. Called
* after changes are made to the filtered data or when sort changes are emitted from MatSort.
* By default, the function retrieves the active sort and its direction and compares data
* by retrieving data using the sortingDataAccessor. May be overridden for a custom implementation
* of data ordering.
* @param data The array of data that should be sorted.
* @param sort The connected MatSort that holds the current sort state.
*/
this.sortData = (data, sort) => {
const active = sort.active;
const direction = sort.direction;
if (!active || direction == '') {
return data;
}
return data.sort((a, b) => {
let valueA = this.sortingDataAccessor(a, active);
let valueB = this.sortingDataAccessor(b, active);
// If there are data in the column that can be converted to a number,
// it must be ensured that the rest of the data
// is of the same type so as not to order incorrectly.
const valueAType = typeof valueA;
const valueBType = typeof valueB;
if (valueAType !== valueBType) {
if (valueAType === 'number') {
valueA += '';
}
if (valueBType === 'number') {
valueB += '';
}
}
// If both valueA and valueB exist (truthy), then compare the two. Otherwise, check if
// one value exists while the other doesn't. In this case, existing value should come last.
// This avoids inconsistent results when comparing values to undefined/null.
// If neither value exists, return 0 (equal).
let comparatorResult = 0;
if (valueA != null && valueB != null) {
// Check if one value is greater than the other; if equal, comparatorResult should remain 0.
if (valueA > valueB) {
comparatorResult = 1;
}
else if (valueA < valueB) {
comparatorResult = -1;
}
}
else if (valueA != null) {
comparatorResult = 1;
}
else if (valueB != null) {
comparatorResult = -1;
}
return comparatorResult * (direction == 'asc' ? 1 : -1);
});
};
/**
* Checks if a data object matches the data source's filter string. By default, each data object
* is converted to a string of its properties and returns true if the filter has
* at least one occurrence in that string. By default, the filter string has its whitespace
* trimmed and the match is case-insensitive. May be overridden for a custom implementation of
* filter matching.
* @param data Data object used to check against the filter.
* @param filter Filter string that has been set on the data source.
* @returns Whether the filter matches against the data
*/
this.filterPredicate = (data, filter) => {
// Transform the data into a lowercase string of all property values.
const dataStr = Object.keys(data).reduce((currentTerm, key) => {
// Use an obscure Unicode character to delimit the words in the concatenated string.
// This avoids matches where the values of two columns combined will match the user's query
// (e.g. `Flute` and `Stop` will match `Test`). The character is intended to be something
// that has a very low chance of being typed in by somebody in a text field. This one in
// particular is "White up-pointing triangle with dot" from
// https://en.wikipedia.org/wiki/List_of_Unicode_characters
return currentTerm + data[key] + '◬';
}, '').toLowerCase();
// Transform the filter by converting it to lowercase and removing whitespace.
const transformedFilter = filter.trim().toLowerCase();
return dataStr.indexOf(transformedFilter) != -1;
};
this._data = new BehaviorSubject(initialData);
this._updateChangeSubscription();
}
/** Array of data that should be rendered by the table, where each object represents one row. */
get data() { return this._data.value; }
set data(data) { this._data.next(data); }
/**
* Filter term that should be used to filter out objects from the data array. To override how
* data objects match to this filter string, provide a custom function for filterPredicate.
*/
get filter() { return this._filter.value; }
set filter(filter) { this._filter.next(filter); }
/**
* Instance of the MatSort directive used by the table to control its sorting. Sort changes
* emitted by the MatSort will trigger an update to the table's rendered data.
*/
get sort() { return this._sort; }
set sort(sort) {
this._sort = sort;
this._updateChangeSubscription();
}
/**
* Instance of the MatPaginator component used by the table to control what page of the data is
* displayed. Page changes emitted by the MatPaginator will trigger an update to the
* table's rendered data.
*
* Note that the data source uses the paginator's properties to calculate which page of data
* should be displayed. If the paginator receives its properties as template inputs,
* e.g. `[pageLength]=100` or `[pageIndex]=1`, then be sure that the paginator's view has been
* initialized before assigning it to this data source.
*/
get paginator() { return this._paginator; }
set paginator(paginator) {
this._paginator = paginator;
this._updateChangeSubscription();
}
/**
* Subscribe to changes that should trigger an update to the table's rendered rows. When the
* changes occur, process the current state of the filter, sort, and pagination along with
* the provided base data and send it to the table for rendering.
*/
_updateChangeSubscription() {
// Sorting and/or pagination should be watched if MatSort and/or MatPaginator are provided.
// The events should emit whenever the component emits a change or initializes, or if no
// component is provided, a stream with just a null event should be provided.
// The `sortChange` and `pageChange` acts as a signal to the combineLatests below so that the
// pipeline can progress to the next step. Note that the value from these streams are not used,
// they purely act as a signal to progress in the pipeline.
const sortChange = this._sort ?
merge(this._sort.sortChange, this._sort.initialized) :
observableOf(null);
const pageChange = this._paginator ?
merge(this._paginator.page, this._internalPageChanges, this._paginator.initialized) :
observableOf(null);
const dataStream = this._data;
// Watch for base data or filter changes to provide a filtered set of data.
const filteredData = combineLatest([dataStream, this._filter])
.pipe(map(([data]) => this._filterData(data)));
// Watch for filtered data or sort changes to provide an ordered set of data.
const orderedData = combineLatest([filteredData, sortChange])
.pipe(map(([data]) => this._orderData(data)));
// Watch for ordered data or page changes to provide a paged set of data.
const paginatedData = combineLatest([orderedData, pageChange])
.pipe(map(([data]) => this._pageData(data)));
// Watched for paged data changes and send the result to the table to render.
this._renderChangesSubscription.unsubscribe();
this._renderChangesSubscription = paginatedData.subscribe(data => this._renderData.next(data));
}
/**
* Returns a filtered data array where each filter object contains the filter string within
* the result of the filterTermAccessor function. If no filter is set, returns the data array
* as provided.
*/
_filterData(data) {
// If there is a filter string, filter out data that does not contain it.
// Each data object is converted to a string using the function defined by filterTermAccessor.
// May be overridden for customization.
this.filteredData = (this.filter == null || this.filter === '') ? data :
data.filter(obj => this.filterPredicate(obj, this.filter));
if (this.paginator) {
this._updatePaginator(this.filteredData.length);
}
return this.filteredData;
}
/**
* Returns a sorted copy of the data if MatSort has a sort applied, otherwise just returns the
* data array as provided. Uses the default data accessor for data lookup, unless a
* sortDataAccessor function is defined.
*/
_orderData(data) {
// If there is no active sort or direction, return the data without trying to sort.
if (!this.sort) {
return data;
}
return this.sortData(data.slice(), this.sort);
}
/**
* Returns a paged slice of the provided data array according to the provided MatPaginator's page
* index and length. If there is no paginator provided, returns the data array as provided.
*/
_pageData(data) {
if (!this.paginator) {
return data;
}
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
return data.slice(startIndex, startIndex + this.paginator.pageSize);
}
/**
* Updates the paginator to reflect the length of the filtered data, and makes sure that the page
* index does not exceed the paginator's last page. Values are changed in a resolved promise to
* guard against making property changes within a round of change detection.
*/
_updatePaginator(filteredDataLength) {
Promise.resolve().then(() => {
const paginator = this.paginator;
if (!paginator) {
return;
}
paginator.length = filteredDataLength;
// If the page index is set beyond the page, reduce it to the last page.
if (paginator.pageIndex > 0) {
const lastPageIndex = Math.ceil(paginator.length / paginator.pageSize) - 1 || 0;
const newPageIndex = Math.min(paginator.pageIndex, lastPageIndex);
if (newPageIndex !== paginator.pageIndex) {
paginator.pageIndex = newPageIndex;
// Since the paginator only emits after user-generated changes,
// we need our own stream so we know to should re-render the data.
this._internalPageChanges.next();
}
}
});
}
/**
* Used by the MatTable. Called when it connects to the data source.
* @docs-private
*/
connect() { return this._renderData; }
/**
* Used by the MatTable. Called when it is destroyed. No-op.
* @docs-private
*/
disconnect() { }
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {_isNumberValue} from '@angular/cdk/coercion';\nimport {DataSource} from '@angular/cdk/table';\nimport {\n  BehaviorSubject,\n  combineLatest,\n  merge,\n  Observable,\n  of as observableOf,\n  Subscription,\n  Subject,\n} from 'rxjs';\nimport {MatPaginator, PageEvent} from '@angular/material/paginator';\nimport {MatSort, Sort} from '@angular/material/sort';\nimport {map} from 'rxjs/operators';\n\n/**\n * Corresponds to `Number.MAX_SAFE_INTEGER`. Moved out into a variable here due to\n * flaky browser support and the value not being defined in Closure's typings.\n */\nconst MAX_SAFE_INTEGER = 9007199254740991;\n\n/**\n * Data source that accepts a client-side data array and includes native support of filtering,\n * sorting (using MatSort), and pagination (using MatPaginator).\n *\n * Allows for sort customization by overriding sortingDataAccessor, which defines how data\n * properties are accessed. Also allows for filter customization by overriding filterTermAccessor,\n * which defines how row data is converted to a string for filter matching.\n *\n * **Note:** This class is meant to be a simple data source to help you get started. As such\n * it isn't equipped to handle some more advanced cases like robust i18n support or server-side\n * interactions. If your app needs to support more advanced use cases, consider implementing your\n * own `DataSource`.\n */\nexport class MatTableDataSource<T> extends DataSource<T> {\n  /** Stream that emits when a new data array is set on the data source. */\n  private readonly _data: BehaviorSubject<T[]>;\n\n  /** Stream emitting render data to the table (depends on ordered data changes). */\n  private readonly _renderData = new BehaviorSubject<T[]>([]);\n\n  /** Stream that emits when a new filter string is set on the data source. */\n  private readonly _filter = new BehaviorSubject<string>('');\n\n  /** Used to react to internal changes of the paginator that are made by the data source itself. */\n  private readonly _internalPageChanges = new Subject<void>();\n\n  /**\n   * Subscription to the changes that should trigger an update to the table's rendered rows, such\n   * as filtering, sorting, pagination, or base data changes.\n   */\n  _renderChangesSubscription = Subscription.EMPTY;\n\n  /**\n   * The filtered set of data that has been matched by the filter string, or all the data if there\n   * is no filter. Useful for knowing the set of data the table represents.\n   * For example, a 'selectAll()' function would likely want to select the set of filtered data\n   * shown to the user rather than all the data.\n   */\n  filteredData: T[];\n\n  /** Array of data that should be rendered by the table, where each object represents one row. */\n  get data() { return this._data.value; }\n  set data(data: T[]) { this._data.next(data); }\n\n  /**\n   * Filter term that should be used to filter out objects from the data array. To override how\n   * data objects match to this filter string, provide a custom function for filterPredicate.\n   */\n  get filter(): string { return this._filter.value; }\n  set filter(filter: string) { this._filter.next(filter); }\n\n  /**\n   * Instance of the MatSort directive used by the table to control its sorting. Sort changes\n   * emitted by the MatSort will trigger an update to the table's rendered data.\n   */\n  get sort(): MatSort | null { return this._sort; }\n  set sort(sort: MatSort|null) {\n    this._sort = sort;\n    this._updateChangeSubscription();\n  }\n  private _sort: MatSort|null;\n\n  /**\n   * Instance of the MatPaginator component used by the table to control what page of the data is\n   * displayed. Page changes emitted by the MatPaginator will trigger an update to the\n   * table's rendered data.\n   *\n   * Note that the data source uses the paginator's properties to calculate which page of data\n   * should be displayed. If the paginator receives its properties as template inputs,\n   * e.g. `[pageLength]=100` or `[pageIndex]=1`, then be sure that the paginator's view has been\n   * initialized before assigning it to this data source.\n   */\n  get paginator(): MatPaginator | null { return this._paginator; }\n  set paginator(paginator: MatPaginator|null) {\n    this._paginator = paginator;\n    this._updateChangeSubscription();\n  }\n  private _paginator: MatPaginator|null;\n\n  /**\n   * Data accessor function that is used for accessing data properties for sorting through\n   * the default sortData function.\n   * This default function assumes that the sort header IDs (which defaults to the column name)\n   * matches the data's properties (e.g. column Xyz represents data['Xyz']).\n   * May be set to a custom function for different behavior.\n   * @param data Data object that is being accessed.\n   * @param sortHeaderId The name of the column that represents the data.\n   */\n  sortingDataAccessor: ((data: T, sortHeaderId: string) => string|number) =\n      (data: T, sortHeaderId: string): string|number => {\n    const value = (data as {[key: string]: any})[sortHeaderId];\n\n    if (_isNumberValue(value)) {\n      const numberValue = Number(value);\n\n      // Numbers beyond `MAX_SAFE_INTEGER` can't be compared reliably so we\n      // leave them as strings. For more info: https://goo.gl/y5vbSg\n      return numberValue < MAX_SAFE_INTEGER ? numberValue : value;\n    }\n\n    return value;\n  }\n\n  /**\n   * Gets a sorted copy of the data array based on the state of the MatSort. Called\n   * after changes are made to the filtered data or when sort changes are emitted from MatSort.\n   * By default, the function retrieves the active sort and its direction and compares data\n   * by retrieving data using the sortingDataAccessor. May be overridden for a custom implementation\n   * of data ordering.\n   * @param data The array of data that should be sorted.\n   * @param sort The connected MatSort that holds the current sort state.\n   */\n  sortData: ((data: T[], sort: MatSort) => T[]) = (data: T[], sort: MatSort): T[] => {\n    const active = sort.active;\n    const direction = sort.direction;\n    if (!active || direction == '') { return data; }\n\n    return data.sort((a, b) => {\n      let valueA = this.sortingDataAccessor(a, active);\n      let valueB = this.sortingDataAccessor(b, active);\n\n      // If there are data in the column that can be converted to a number,\n      // it must be ensured that the rest of the data\n      // is of the same type so as not to order incorrectly.\n      const valueAType = typeof valueA;\n      const valueBType = typeof valueB;\n\n      if (valueAType !== valueBType) {\n        if (valueAType === 'number') { valueA += ''; }\n        if (valueBType === 'number') { valueB += ''; }\n      }\n\n      // If both valueA and valueB exist (truthy), then compare the two. Otherwise, check if\n      // one value exists while the other doesn't. In this case, existing value should come last.\n      // This avoids inconsistent results when comparing values to undefined/null.\n      // If neither value exists, return 0 (equal).\n      let comparatorResult = 0;\n      if (valueA != null && valueB != null) {\n        // Check if one value is greater than the other; if equal, comparatorResult should remain 0.\n        if (valueA > valueB) {\n          comparatorResult = 1;\n        } else if (valueA < valueB) {\n          comparatorResult = -1;\n        }\n      } else if (valueA != null) {\n        comparatorResult = 1;\n      } else if (valueB != null) {\n        comparatorResult = -1;\n      }\n\n      return comparatorResult * (direction == 'asc' ? 1 : -1);\n    });\n  }\n\n  /**\n   * Checks if a data object matches the data source's filter string. By default, each data object\n   * is converted to a string of its properties and returns true if the filter has\n   * at least one occurrence in that string. By default, the filter string has its whitespace\n   * trimmed and the match is case-insensitive. May be overridden for a custom implementation of\n   * filter matching.\n   * @param data Data object used to check against the filter.\n   * @param filter Filter string that has been set on the data source.\n   * @returns Whether the filter matches against the data\n   */\n  filterPredicate: ((data: T, filter: string) => boolean) = (data: T, filter: string): boolean => {\n    // Transform the data into a lowercase string of all property values.\n    const dataStr = Object.keys(data).reduce((currentTerm: string, key: string) => {\n      // Use an obscure Unicode character to delimit the words in the concatenated string.\n      // This avoids matches where the values of two columns combined will match the user's query\n      // (e.g. `Flute` and `Stop` will match `Test`). The character is intended to be something\n      // that has a very low chance of being typed in by somebody in a text field. This one in\n      // particular is \"White up-pointing triangle with dot\" from\n      // https://en.wikipedia.org/wiki/List_of_Unicode_characters\n      return currentTerm + (data as {[key: string]: any})[key] + '◬';\n    }, '').toLowerCase();\n\n    // Transform the filter by converting it to lowercase and removing whitespace.\n    const transformedFilter = filter.trim().toLowerCase();\n\n    return dataStr.indexOf(transformedFilter) != -1;\n  }\n\n  constructor(initialData: T[] = []) {\n    super();\n    this._data = new BehaviorSubject<T[]>(initialData);\n    this._updateChangeSubscription();\n  }\n\n  /**\n   * Subscribe to changes that should trigger an update to the table's rendered rows. When the\n   * changes occur, process the current state of the filter, sort, and pagination along with\n   * the provided base data and send it to the table for rendering.\n   */\n  _updateChangeSubscription() {\n    // Sorting and/or pagination should be watched if MatSort and/or MatPaginator are provided.\n    // The events should emit whenever the component emits a change or initializes, or if no\n    // component is provided, a stream with just a null event should be provided.\n    // The `sortChange` and `pageChange` acts as a signal to the combineLatests below so that the\n    // pipeline can progress to the next step. Note that the value from these streams are not used,\n    // they purely act as a signal to progress in the pipeline.\n    const sortChange: Observable<Sort|null|void> = this._sort ?\n        merge(this._sort.sortChange, this._sort.initialized) as Observable<Sort|void> :\n        observableOf(null);\n    const pageChange: Observable<PageEvent|null|void> = this._paginator ?\n        merge(\n          this._paginator.page,\n          this._internalPageChanges,\n          this._paginator.initialized\n        ) as Observable<PageEvent|void> :\n        observableOf(null);\n    const dataStream = this._data;\n    // Watch for base data or filter changes to provide a filtered set of data.\n    const filteredData = combineLatest([dataStream, this._filter])\n      .pipe(map(([data]) => this._filterData(data)));\n    // Watch for filtered data or sort changes to provide an ordered set of data.\n    const orderedData = combineLatest([filteredData, sortChange])\n      .pipe(map(([data]) => this._orderData(data)));\n    // Watch for ordered data or page changes to provide a paged set of data.\n    const paginatedData = combineLatest([orderedData, pageChange])\n      .pipe(map(([data]) => this._pageData(data)));\n    // Watched for paged data changes and send the result to the table to render.\n    this._renderChangesSubscription.unsubscribe();\n    this._renderChangesSubscription = paginatedData.subscribe(data => this._renderData.next(data));\n  }\n\n  /**\n   * Returns a filtered data array where each filter object contains the filter string within\n   * the result of the filterTermAccessor function. If no filter is set, returns the data array\n   * as provided.\n   */\n  _filterData(data: T[]) {\n    // If there is a filter string, filter out data that does not contain it.\n    // Each data object is converted to a string using the function defined by filterTermAccessor.\n    // May be overridden for customization.\n    this.filteredData = (this.filter == null || this.filter === '') ? data :\n        data.filter(obj => this.filterPredicate(obj, this.filter));\n\n    if (this.paginator) { this._updatePaginator(this.filteredData.length); }\n\n    return this.filteredData;\n  }\n\n  /**\n   * Returns a sorted copy of the data if MatSort has a sort applied, otherwise just returns the\n   * data array as provided. Uses the default data accessor for data lookup, unless a\n   * sortDataAccessor function is defined.\n   */\n  _orderData(data: T[]): T[] {\n    // If there is no active sort or direction, return the data without trying to sort.\n    if (!this.sort) { return data; }\n\n    return this.sortData(data.slice(), this.sort);\n  }\n\n  /**\n   * Returns a paged slice of the provided data array according to the provided MatPaginator's page\n   * index and length. If there is no paginator provided, returns the data array as provided.\n   */\n  _pageData(data: T[]): T[] {\n    if (!this.paginator) { return data; }\n\n    const startIndex = this.paginator.pageIndex * this.paginator.pageSize;\n    return data.slice(startIndex, startIndex + this.paginator.pageSize);\n  }\n\n  /**\n   * Updates the paginator to reflect the length of the filtered data, and makes sure that the page\n   * index does not exceed the paginator's last page. Values are changed in a resolved promise to\n   * guard against making property changes within a round of change detection.\n   */\n  _updatePaginator(filteredDataLength: number) {\n    Promise.resolve().then(() => {\n      const paginator = this.paginator;\n\n      if (!paginator) { return; }\n\n      paginator.length = filteredDataLength;\n\n      // If the page index is set beyond the page, reduce it to the last page.\n      if (paginator.pageIndex > 0) {\n        const lastPageIndex = Math.ceil(paginator.length / paginator.pageSize) - 1 || 0;\n        const newPageIndex = Math.min(paginator.pageIndex, lastPageIndex);\n\n        if (newPageIndex !== paginator.pageIndex) {\n          paginator.pageIndex = newPageIndex;\n\n          // Since the paginator only emits after user-generated changes,\n          // we need our own stream so we know to should re-render the data.\n          this._internalPageChanges.next();\n        }\n      }\n    });\n  }\n\n  /**\n   * Used by the MatTable. Called when it connects to the data source.\n   * @docs-private\n   */\n  connect() { return this._renderData; }\n\n  /**\n   * Used by the MatTable. Called when it is destroyed. No-op.\n   * @docs-private\n   */\n  disconnect() { }\n}\n"]}