@angular/common
Version:
Angular - commonly needed directives and services
162 lines • 19.5 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 { Directive, ElementRef, Input, IterableDiffers, KeyValueDiffers, Renderer2, ɵisListLikeIterable as isListLikeIterable, ɵstringify as stringify } from '@angular/core';
/**
* @ngModule CommonModule
*
* @usageNotes
* ```
* <some-element [ngClass]="'first second'">...</some-element>
*
* <some-element [ngClass]="['first', 'second']">...</some-element>
*
* <some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>
*
* <some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>
*
* <some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>
* ```
*
* @description
*
* Adds and removes CSS classes on an HTML element.
*
* The CSS classes are updated as follows, depending on the type of the expression evaluation:
* - `string` - the CSS classes listed in the string (space delimited) are added,
* - `Array` - the CSS classes declared as Array elements are added,
* - `Object` - keys are CSS classes that get added when the expression given in the value
* evaluates to a truthy value, otherwise they are removed.
*
* @publicApi
*/
export class NgClass {
constructor(_iterableDiffers, _keyValueDiffers, _ngEl, _renderer) {
this._iterableDiffers = _iterableDiffers;
this._keyValueDiffers = _keyValueDiffers;
this._ngEl = _ngEl;
this._renderer = _renderer;
this._iterableDiffer = null;
this._keyValueDiffer = null;
this._initialClasses = [];
this._rawClass = null;
}
set klass(value) {
this._removeClasses(this._initialClasses);
this._initialClasses = typeof value === 'string' ? value.split(/\s+/) : [];
this._applyClasses(this._initialClasses);
this._applyClasses(this._rawClass);
}
set ngClass(value) {
this._removeClasses(this._rawClass);
this._applyClasses(this._initialClasses);
this._iterableDiffer = null;
this._keyValueDiffer = null;
this._rawClass = typeof value === 'string' ? value.split(/\s+/) : value;
if (this._rawClass) {
if (isListLikeIterable(this._rawClass)) {
this._iterableDiffer = this._iterableDiffers.find(this._rawClass).create();
}
else {
this._keyValueDiffer = this._keyValueDiffers.find(this._rawClass).create();
}
}
}
ngDoCheck() {
if (this._iterableDiffer) {
const iterableChanges = this._iterableDiffer.diff(this._rawClass);
if (iterableChanges) {
this._applyIterableChanges(iterableChanges);
}
}
else if (this._keyValueDiffer) {
const keyValueChanges = this._keyValueDiffer.diff(this._rawClass);
if (keyValueChanges) {
this._applyKeyValueChanges(keyValueChanges);
}
}
}
_applyKeyValueChanges(changes) {
changes.forEachAddedItem((record) => this._toggleClass(record.key, record.currentValue));
changes.forEachChangedItem((record) => this._toggleClass(record.key, record.currentValue));
changes.forEachRemovedItem((record) => {
if (record.previousValue) {
this._toggleClass(record.key, false);
}
});
}
_applyIterableChanges(changes) {
changes.forEachAddedItem((record) => {
if (typeof record.item === 'string') {
this._toggleClass(record.item, true);
}
else {
throw new Error(`NgClass can only toggle CSS classes expressed as strings, got ${stringify(record.item)}`);
}
});
changes.forEachRemovedItem((record) => this._toggleClass(record.item, false));
}
/**
* Applies a collection of CSS classes to the DOM element.
*
* For argument of type Set and Array CSS class names contained in those collections are always
* added.
* For argument of type Map CSS class name in the map's key is toggled based on the value (added
* for truthy and removed for falsy).
*/
_applyClasses(rawClassVal) {
if (rawClassVal) {
if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) {
rawClassVal.forEach((klass) => this._toggleClass(klass, true));
}
else {
Object.keys(rawClassVal).forEach(klass => this._toggleClass(klass, !!rawClassVal[klass]));
}
}
}
/**
* Removes a collection of CSS classes from the DOM element. This is mostly useful for cleanup
* purposes.
*/
_removeClasses(rawClassVal) {
if (rawClassVal) {
if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) {
rawClassVal.forEach((klass) => this._toggleClass(klass, false));
}
else {
Object.keys(rawClassVal).forEach(klass => this._toggleClass(klass, false));
}
}
}
_toggleClass(klass, enabled) {
klass = klass.trim();
if (klass) {
klass.split(/\s+/g).forEach(klass => {
if (enabled) {
this._renderer.addClass(this._ngEl.nativeElement, klass);
}
else {
this._renderer.removeClass(this._ngEl.nativeElement, klass);
}
});
}
}
}
NgClass.decorators = [
{ type: Directive, args: [{ selector: '[ngClass]' },] }
];
NgClass.ctorParameters = () => [
{ type: IterableDiffers },
{ type: KeyValueDiffers },
{ type: ElementRef },
{ type: Renderer2 }
];
NgClass.propDecorators = {
klass: [{ type: Input, args: ['class',] }],
ngClass: [{ type: Input, args: ['ngClass',] }]
};
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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 */\nimport {Directive, DoCheck, ElementRef, Input, IterableChanges, IterableDiffer, IterableDiffers, KeyValueChanges, KeyValueDiffer, KeyValueDiffers, Renderer2, ɵisListLikeIterable as isListLikeIterable, ɵstringify as stringify} from '@angular/core';\n\ntype NgClassSupportedTypes = string[]|Set<string>|{[klass: string]: any}|null|undefined;\n\n/**\n * @ngModule CommonModule\n *\n * @usageNotes\n * ```\n *     <some-element [ngClass]=\"'first second'\">...</some-element>\n *\n *     <some-element [ngClass]=\"['first', 'second']\">...</some-element>\n *\n *     <some-element [ngClass]=\"{'first': true, 'second': true, 'third': false}\">...</some-element>\n *\n *     <some-element [ngClass]=\"stringExp|arrayExp|objExp\">...</some-element>\n *\n *     <some-element [ngClass]=\"{'class1 class2 class3' : true}\">...</some-element>\n * ```\n *\n * @description\n *\n * Adds and removes CSS classes on an HTML element.\n *\n * The CSS classes are updated as follows, depending on the type of the expression evaluation:\n * - `string` - the CSS classes listed in the string (space delimited) are added,\n * - `Array` - the CSS classes declared as Array elements are added,\n * - `Object` - keys are CSS classes that get added when the expression given in the value\n *              evaluates to a truthy value, otherwise they are removed.\n *\n * @publicApi\n */\n@Directive({selector: '[ngClass]'})\nexport class NgClass implements DoCheck {\n  private _iterableDiffer: IterableDiffer<string>|null = null;\n  private _keyValueDiffer: KeyValueDiffer<string, any>|null = null;\n  private _initialClasses: string[] = [];\n  private _rawClass: NgClassSupportedTypes = null;\n\n  constructor(\n      private _iterableDiffers: IterableDiffers, private _keyValueDiffers: KeyValueDiffers,\n      private _ngEl: ElementRef, private _renderer: Renderer2) {}\n\n\n  @Input('class')\n  set klass(value: string) {\n    this._removeClasses(this._initialClasses);\n    this._initialClasses = typeof value === 'string' ? value.split(/\\s+/) : [];\n    this._applyClasses(this._initialClasses);\n    this._applyClasses(this._rawClass);\n  }\n\n  @Input('ngClass')\n  set ngClass(value: string|string[]|Set<string>|{[klass: string]: any}) {\n    this._removeClasses(this._rawClass);\n    this._applyClasses(this._initialClasses);\n\n    this._iterableDiffer = null;\n    this._keyValueDiffer = null;\n\n    this._rawClass = typeof value === 'string' ? value.split(/\\s+/) : value;\n\n    if (this._rawClass) {\n      if (isListLikeIterable(this._rawClass)) {\n        this._iterableDiffer = this._iterableDiffers.find(this._rawClass).create();\n      } else {\n        this._keyValueDiffer = this._keyValueDiffers.find(this._rawClass).create();\n      }\n    }\n  }\n\n  ngDoCheck() {\n    if (this._iterableDiffer) {\n      const iterableChanges = this._iterableDiffer.diff(this._rawClass as string[]);\n      if (iterableChanges) {\n        this._applyIterableChanges(iterableChanges);\n      }\n    } else if (this._keyValueDiffer) {\n      const keyValueChanges = this._keyValueDiffer.diff(this._rawClass as {[k: string]: any});\n      if (keyValueChanges) {\n        this._applyKeyValueChanges(keyValueChanges);\n      }\n    }\n  }\n\n  private _applyKeyValueChanges(changes: KeyValueChanges<string, any>): void {\n    changes.forEachAddedItem((record) => this._toggleClass(record.key, record.currentValue));\n    changes.forEachChangedItem((record) => this._toggleClass(record.key, record.currentValue));\n    changes.forEachRemovedItem((record) => {\n      if (record.previousValue) {\n        this._toggleClass(record.key, false);\n      }\n    });\n  }\n\n  private _applyIterableChanges(changes: IterableChanges<string>): void {\n    changes.forEachAddedItem((record) => {\n      if (typeof record.item === 'string') {\n        this._toggleClass(record.item, true);\n      } else {\n        throw new Error(`NgClass can only toggle CSS classes expressed as strings, got ${\n            stringify(record.item)}`);\n      }\n    });\n\n    changes.forEachRemovedItem((record) => this._toggleClass(record.item, false));\n  }\n\n  /**\n   * Applies a collection of CSS classes to the DOM element.\n   *\n   * For argument of type Set and Array CSS class names contained in those collections are always\n   * added.\n   * For argument of type Map CSS class name in the map's key is toggled based on the value (added\n   * for truthy and removed for falsy).\n   */\n  private _applyClasses(rawClassVal: NgClassSupportedTypes) {\n    if (rawClassVal) {\n      if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) {\n        (<any>rawClassVal).forEach((klass: string) => this._toggleClass(klass, true));\n      } else {\n        Object.keys(rawClassVal).forEach(klass => this._toggleClass(klass, !!rawClassVal[klass]));\n      }\n    }\n  }\n\n  /**\n   * Removes a collection of CSS classes from the DOM element. This is mostly useful for cleanup\n   * purposes.\n   */\n  private _removeClasses(rawClassVal: NgClassSupportedTypes) {\n    if (rawClassVal) {\n      if (Array.isArray(rawClassVal) || rawClassVal instanceof Set) {\n        (<any>rawClassVal).forEach((klass: string) => this._toggleClass(klass, false));\n      } else {\n        Object.keys(rawClassVal).forEach(klass => this._toggleClass(klass, false));\n      }\n    }\n  }\n\n  private _toggleClass(klass: string, enabled: boolean): void {\n    klass = klass.trim();\n    if (klass) {\n      klass.split(/\\s+/g).forEach(klass => {\n        if (enabled) {\n          this._renderer.addClass(this._ngEl.nativeElement, klass);\n        } else {\n          this._renderer.removeClass(this._ngEl.nativeElement, klass);\n        }\n      });\n    }\n  }\n}\n"]}