ng-track-by/fesm2015/ng-track-by.js

trackBy and trackById directives which provide TrackByFunction to ngForTrackBy

import * as i1 from '@angular/common';
import { CommonModule } from '@angular/common';
import * as i0 from '@angular/core';
import { Directive, NgModule, Input } from '@angular/core';
import { not } from 'logical-not';

function changeTrackBy(ngForOf, trackBy, property) {
    ngForOf.ngForTrackBy = trackBy;
    patch(ngForOf, trackBy, property);
}
function patch(ngForOf, trackBy, property) {
    const differ = ngForOf._differ;
    differ._trackByFn = trackBy;
    const linkedRecordsMap = differ._linkedRecords.map;
    differ.forEachItem((record) => {
        const trackById = record.item[property];
        linkedRecordsMap.set(trackById, linkedRecordsMap.get(record.trackById));
        linkedRecordsMap.delete(record.trackById);
        record.trackById = record.item[property];
    });
}

const markedKey = Symbol();
function marked(ngForOf) {
    const marked = markedKey in ngForOf;
    ngForOf[markedKey] = undefined;
    return marked;
}

const trackById = (_, item) => {
    return item.id;
};
class TrackByIdDirective {
    constructor(ngForOf) {
        this.ngForOf = ngForOf;
    }
    ngOnInit() {
        if (not(marked(this.ngForOf)))
            changeTrackBy(this.ngForOf, trackById, "id");
    }
}
TrackByIdDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByIdDirective, deps: [{ token: i1.NgForOf }], target: i0.ɵɵFactoryTarget.Directive });
TrackByIdDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "12.2.0", type: TrackByIdDirective, selector: "[trackById]", ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByIdDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: "[trackById]",
                }]
        }], ctorParameters: function () { return [{ type: i1.NgForOf }]; } });
class TrackByIdModule {
}
TrackByIdModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByIdModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
TrackByIdModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByIdModule, declarations: [TrackByIdDirective], imports: [CommonModule], exports: [TrackByIdDirective] });
TrackByIdModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByIdModule, imports: [[CommonModule]] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByIdModule, decorators: [{
            type: NgModule,
            args: [{
                    imports: [CommonModule],
                    exports: [TrackByIdDirective],
                    declarations: [TrackByIdDirective],
                }]
        }] });

class TrackByDirective {
    constructor(ngForOf) {
        this.ngForOf = ngForOf;
    }
    ngOnInit() {
        if (not(marked(this.ngForOf)))
            changeTrackBy(this.ngForOf, this.createTrackByFn(), this.trackBy);
    }
    createTrackByFn() {
        const key = this.trackBy;
        return function (_, item) {
            return item[key];
        };
    }
}
TrackByDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByDirective, deps: [{ token: i1.NgForOf }], target: i0.ɵɵFactoryTarget.Directive });
TrackByDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "12.2.0", type: TrackByDirective, selector: "[trackBy]", inputs: { trackBy: "trackBy" }, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: "[trackBy]",
                }]
        }], ctorParameters: function () { return [{ type: i1.NgForOf }]; }, propDecorators: { trackBy: [{
                type: Input
            }] } });
class TrackByModule {
}
TrackByModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
TrackByModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, declarations: [TrackByDirective], imports: [CommonModule], exports: [TrackByDirective] });
TrackByModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, imports: [[CommonModule]] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.2.0", ngImport: i0, type: TrackByModule, decorators: [{
            type: NgModule,
            args: [{
                    imports: [CommonModule],
                    exports: [TrackByDirective],
                    declarations: [TrackByDirective],
                }]
        }] });

/*
 * Public API Surface of ng-track-by
 */

/**
 * Generated bundle index. Do not edit.
 */

export { TrackByDirective, TrackByIdDirective, TrackByIdModule, TrackByModule };
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