gridstack
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TypeScript/JS lib for dashboard layout and creation, responsive, mobile support, no external dependencies, with many wrappers (React, Angular, Vue, Ember, knockout...)
414 lines • 53.3 kB
JavaScript
/**
* gridstack.component.ts 12.3.3
* Copyright (c) 2022-2024 Alain Dumesny - see GridStack root license
*/
import { Component, ContentChildren, EventEmitter, Input, Output, ViewChild, ViewContainerRef, reflectComponentType } from '@angular/core';
import { NgIf } from '@angular/common';
import { GridStack } from 'gridstack';
import { GridstackItemComponent } from './gridstack-item.component';
import * as i0 from "@angular/core";
/**
* Angular component wrapper for GridStack.
*
* This component provides Angular integration for GridStack grids, handling:
* - Grid initialization and lifecycle
* - Dynamic component creation and management
* - Event binding and emission
* - Integration with Angular change detection
*
* Use in combination with GridstackItemComponent for individual grid items.
*
* @example
* ```html
* <gridstack [options]="gridOptions" (change)="onGridChange($event)">
* <div empty-content>Drag widgets here</div>
* </gridstack>
* ```
*/
export class GridstackComponent {
constructor(elementRef) {
this.elementRef = elementRef;
/**
* GridStack event emitters for Angular integration.
*
* These provide Angular-style event handling for GridStack events.
* Alternatively, use `this.grid.on('event1 event2', callback)` for multiple events.
*
* Note: 'CB' suffix prevents conflicts with native DOM events.
*
* @example
* ```html
* <gridstack (changeCB)="onGridChange($event)" (droppedCB)="onItemDropped($event)">
* </gridstack>
* ```
*/
/** Emitted when widgets are added to the grid */
this.addedCB = new EventEmitter();
/** Emitted when grid layout changes */
this.changeCB = new EventEmitter();
/** Emitted when grid is disabled */
this.disableCB = new EventEmitter();
/** Emitted during widget drag operations */
this.dragCB = new EventEmitter();
/** Emitted when widget drag starts */
this.dragStartCB = new EventEmitter();
/** Emitted when widget drag stops */
this.dragStopCB = new EventEmitter();
/** Emitted when widget is dropped */
this.droppedCB = new EventEmitter();
/** Emitted when grid is enabled */
this.enableCB = new EventEmitter();
/** Emitted when widgets are removed from the grid */
this.removedCB = new EventEmitter();
/** Emitted during widget resize operations */
this.resizeCB = new EventEmitter();
/** Emitted when widget resize starts */
this.resizeStartCB = new EventEmitter();
/** Emitted when widget resize stops */
this.resizeStopCB = new EventEmitter();
// set globally our method to create the right widget type
if (!GridStack.addRemoveCB) {
GridStack.addRemoveCB = gsCreateNgComponents;
}
if (!GridStack.saveCB) {
GridStack.saveCB = gsSaveAdditionalNgInfo;
}
if (!GridStack.updateCB) {
GridStack.updateCB = gsUpdateNgComponents;
}
this.el._gridComp = this;
}
/**
* Grid configuration options.
* Can be set before grid initialization or updated after grid is created.
*
* @example
* ```typescript
* gridOptions: GridStackOptions = {
* column: 12,
* cellHeight: 'auto',
* animate: true
* };
* ```
*/
set options(o) {
if (this._grid) {
this._grid.updateOptions(o);
}
else {
this._options = o;
}
}
/** Get the current running grid options */
get options() { return this._grid?.opts || this._options || {}; }
/**
* Get the native DOM element that contains grid-specific fields.
* This element has GridStack properties attached to it.
*/
get el() { return this.elementRef.nativeElement; }
/**
* Get the underlying GridStack instance.
* Use this to access GridStack API methods directly.
*
* @example
* ```typescript
* this.gridComponent.grid.addWidget({x: 0, y: 0, w: 2, h: 1});
* ```
*/
get grid() { return this._grid; }
/**
* Register a list of Angular components for dynamic creation.
*
* @param typeList Array of component types to register
*
* @example
* ```typescript
* GridstackComponent.addComponentToSelectorType([
* MyWidgetComponent,
* AnotherWidgetComponent
* ]);
* ```
*/
static addComponentToSelectorType(typeList) {
typeList.forEach(type => GridstackComponent.selectorToType[GridstackComponent.getSelector(type)] = type);
}
/**
* Extract the selector string from an Angular component type.
*
* @param type The component type to get selector from
* @returns The component's selector string
*/
static getSelector(type) {
return reflectComponentType(type).selector;
}
ngOnInit() {
// init ourself before any template children are created since we track them below anyway - no need to double create+update widgets
this.loaded = !!this.options?.children?.length;
this._grid = GridStack.init(this._options, this.el);
delete this._options; // GS has it now
this.checkEmpty();
}
/** wait until after all DOM is ready to init gridstack children (after angular ngFor and sub-components run first) */
ngAfterContentInit() {
// track whenever the children list changes and update the layout...
this._sub = this.gridstackItems?.changes.subscribe(() => this.updateAll());
// ...and do this once at least unless we loaded children already
if (!this.loaded)
this.updateAll();
this.hookEvents(this.grid);
}
ngOnDestroy() {
this.unhookEvents(this._grid);
this._sub?.unsubscribe();
this._grid?.destroy();
delete this._grid;
delete this.el._gridComp;
delete this.container;
delete this.ref;
}
/**
* called when the TEMPLATE (not recommended) list of items changes - get a list of nodes and
* update the layout accordingly (which will take care of adding/removing items changed by Angular)
*/
updateAll() {
if (!this.grid)
return;
const layout = [];
this.gridstackItems?.forEach(item => {
layout.push(item.options);
item.clearOptions();
});
this.grid.load(layout); // efficient that does diffs only
}
/** check if the grid is empty, if so show alternative content */
checkEmpty() {
if (!this.grid)
return;
this.isEmpty = !this.grid.engine.nodes.length;
}
/** get all known events as easy to use Outputs for convenience */
hookEvents(grid) {
if (!grid)
return;
// nested grids don't have events in v12.1+ so skip
if (grid.parentGridNode)
return;
grid
.on('added', (event, nodes) => {
const gridComp = nodes[0].grid?.el._gridComp || this;
gridComp.checkEmpty();
this.addedCB.emit({ event, nodes });
})
.on('change', (event, nodes) => this.changeCB.emit({ event, nodes }))
.on('disable', (event) => this.disableCB.emit({ event }))
.on('drag', (event, el) => this.dragCB.emit({ event, el }))
.on('dragstart', (event, el) => this.dragStartCB.emit({ event, el }))
.on('dragstop', (event, el) => this.dragStopCB.emit({ event, el }))
.on('dropped', (event, previousNode, newNode) => this.droppedCB.emit({ event, previousNode, newNode }))
.on('enable', (event) => this.enableCB.emit({ event }))
.on('removed', (event, nodes) => {
const gridComp = nodes[0].grid?.el._gridComp || this;
gridComp.checkEmpty();
this.removedCB.emit({ event, nodes });
})
.on('resize', (event, el) => this.resizeCB.emit({ event, el }))
.on('resizestart', (event, el) => this.resizeStartCB.emit({ event, el }))
.on('resizestop', (event, el) => this.resizeStopCB.emit({ event, el }));
}
unhookEvents(grid) {
if (!grid)
return;
// nested grids don't have events in v12.1+ so skip
if (grid.parentGridNode)
return;
grid.off('added change disable drag dragstart dragstop dropped enable removed resize resizestart resizestop');
}
}
/**
* Mapping of component selectors to their types for dynamic creation.
*
* This enables dynamic component instantiation from string selectors.
* Angular doesn't provide public access to this mapping, so we maintain our own.
*
* @example
* ```typescript
* GridstackComponent.addComponentToSelectorType([MyWidgetComponent]);
* ```
*/
GridstackComponent.selectorToType = {};
GridstackComponent.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: GridstackComponent, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Component });
GridstackComponent.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "14.3.0", type: GridstackComponent, isStandalone: true, selector: "gridstack", inputs: { options: "options", isEmpty: "isEmpty" }, outputs: { addedCB: "addedCB", changeCB: "changeCB", disableCB: "disableCB", dragCB: "dragCB", dragStartCB: "dragStartCB", dragStopCB: "dragStopCB", droppedCB: "droppedCB", enableCB: "enableCB", removedCB: "removedCB", resizeCB: "resizeCB", resizeStartCB: "resizeStartCB", resizeStopCB: "resizeStopCB" }, queries: [{ propertyName: "gridstackItems", predicate: GridstackItemComponent }], viewQueries: [{ propertyName: "container", first: true, predicate: ["container"], descendants: true, read: ViewContainerRef, static: true }], ngImport: i0, template: `
<!-- content to show when when grid is empty, like instructions on how to add widgets -->
<ng-content select="[empty-content]" *ngIf="isEmpty"></ng-content>
<!-- where dynamic items go -->
<ng-template #container></ng-template>
<!-- where template items go -->
<ng-content></ng-content>
`, isInline: true, styles: [":host{display:block}\n"], dependencies: [{ kind: "directive", type: NgIf, selector: "[ngIf]", inputs: ["ngIf", "ngIfThen", "ngIfElse"] }] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: GridstackComponent, decorators: [{
type: Component,
args: [{ selector: 'gridstack', template: `
<!-- content to show when when grid is empty, like instructions on how to add widgets -->
<ng-content select="[empty-content]" *ngIf="isEmpty"></ng-content>
<!-- where dynamic items go -->
<ng-template #container></ng-template>
<!-- where template items go -->
<ng-content></ng-content>
`, standalone: true, imports: [NgIf], styles: [":host{display:block}\n"] }]
}], ctorParameters: function () { return [{ type: i0.ElementRef }]; }, propDecorators: { gridstackItems: [{
type: ContentChildren,
args: [GridstackItemComponent]
}], container: [{
type: ViewChild,
args: ['container', { read: ViewContainerRef, static: true }]
}], options: [{
type: Input
}], isEmpty: [{
type: Input
}], addedCB: [{
type: Output
}], changeCB: [{
type: Output
}], disableCB: [{
type: Output
}], dragCB: [{
type: Output
}], dragStartCB: [{
type: Output
}], dragStopCB: [{
type: Output
}], droppedCB: [{
type: Output
}], enableCB: [{
type: Output
}], removedCB: [{
type: Output
}], resizeCB: [{
type: Output
}], resizeStartCB: [{
type: Output
}], resizeStopCB: [{
type: Output
}] } });
/**
* can be used when a new item needs to be created, which we do as a Angular component, or deleted (skip)
**/
export function gsCreateNgComponents(host, n, add, isGrid) {
if (add) {
//
// create the component dynamically - see https://angular.io/docs/ts/latest/cookbook/dynamic-component-loader.html
//
if (!host)
return;
if (isGrid) {
// TODO: figure out how to create ng component inside regular Div. need to access app injectors...
// if (!container) {
// const hostElement: Element = host;
// const environmentInjector: EnvironmentInjector;
// grid = createComponent(GridstackComponent, {environmentInjector, hostElement})?.instance;
// }
const gridItemComp = host.parentElement?._gridItemComp;
if (!gridItemComp)
return;
// check if gridItem has a child component with 'container' exposed to create under..
const container = gridItemComp.childWidget?.container || gridItemComp.container;
const gridRef = container?.createComponent(GridstackComponent);
const grid = gridRef?.instance;
if (!grid)
return;
grid.ref = gridRef;
grid.options = n;
return grid.el;
}
else {
const gridComp = host._gridComp;
const gridItemRef = gridComp?.container?.createComponent(GridstackItemComponent);
const gridItem = gridItemRef?.instance;
if (!gridItem)
return;
gridItem.ref = gridItemRef;
// define what type of component to create as child, OR you can do it GridstackItemComponent template, but this is more generic
const selector = n.selector;
const type = selector ? GridstackComponent.selectorToType[selector] : undefined;
if (type) {
// shared code to create our selector component
const createComp = () => {
const childWidget = gridItem.container?.createComponent(type)?.instance;
// if proper BaseWidget subclass, save it and load additional data
if (childWidget && typeof childWidget.serialize === 'function' && typeof childWidget.deserialize === 'function') {
gridItem.childWidget = childWidget;
childWidget.deserialize(n);
}
};
const lazyLoad = n.lazyLoad || n.grid?.opts?.lazyLoad && n.lazyLoad !== false;
if (lazyLoad) {
if (!n.visibleObservable) {
n.visibleObservable = new IntersectionObserver(([entry]) => {
if (entry.isIntersecting) {
n.visibleObservable?.disconnect();
delete n.visibleObservable;
createComp();
}
});
window.setTimeout(() => n.visibleObservable?.observe(gridItem.el)); // wait until callee sets position attributes
}
}
else
createComp();
}
return gridItem.el;
}
}
else {
//
// REMOVE - have to call ComponentRef:destroy() for dynamic objects to correctly remove themselves
// Note: this will destroy all children dynamic components as well: gridItem -> childWidget
//
if (isGrid) {
const grid = n.el?._gridComp;
if (grid?.ref)
grid.ref.destroy();
else
grid?.ngOnDestroy();
}
else {
const gridItem = n.el?._gridItemComp;
if (gridItem?.ref)
gridItem.ref.destroy();
else
gridItem?.ngOnDestroy();
}
}
return;
}
/**
* called for each item in the grid - check if additional information needs to be saved.
* Note: since this is options minus gridstack protected members using Utils.removeInternalForSave(),
* this typically doesn't need to do anything. However your custom Component @Input() are now supported
* using BaseWidget.serialize()
*/
export function gsSaveAdditionalNgInfo(n, w) {
const gridItem = n.el?._gridItemComp;
if (gridItem) {
const input = gridItem.childWidget?.serialize();
if (input) {
w.input = input;
}
return;
}
// else check if Grid
const grid = n.el?._gridComp;
if (grid) {
//.... save any custom data
}
}
/**
* track when widgeta re updated (rather than created) to make sure we de-serialize them as well
*/
export function gsUpdateNgComponents(n) {
const w = n;
const gridItem = n.el?._gridItemComp;
if (gridItem?.childWidget && w.input)
gridItem.childWidget.deserialize(w);
}
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* gridstack.component.ts 12.3.3\n * Copyright (c) 2022-2024 Alain Dumesny - see GridStack root license\n */\n\nimport {\n    AfterContentInit, Component, ContentChildren, ElementRef, EventEmitter, Input,\n    OnDestroy, OnInit, Output, QueryList, Type, ViewChild, ViewContainerRef, reflectComponentType, ComponentRef\n} from '@angular/core';\nimport { NgIf } from '@angular/common';\nimport { Subscription } from 'rxjs';\nimport { GridHTMLElement, GridItemHTMLElement, GridStack, GridStackNode, GridStackOptions, GridStackWidget } from 'gridstack';\n\nimport { NgGridStackNode, NgGridStackWidget } from './types';\nimport { BaseWidget } from './base-widget';\nimport { GridItemCompHTMLElement, GridstackItemComponent } from './gridstack-item.component';\n\n/**\n * Event handler callback signatures for different GridStack events.\n * These types define the structure of data passed to Angular event emitters.\n */\n\n/** Callback for general events (enable, disable, etc.) */\nexport type eventCB = {event: Event};\n\n/** Callback for element-specific events (resize, drag, etc.) */\nexport type elementCB = {event: Event, el: GridItemHTMLElement};\n\n/** Callback for events affecting multiple nodes (change, etc.) */\nexport type nodesCB = {event: Event, nodes: GridStackNode[]};\n\n/** Callback for drop events with before/after node state */\nexport type droppedCB = {event: Event, previousNode: GridStackNode, newNode: GridStackNode};\n\n/**\n * Extended HTMLElement interface for the grid container.\n * Stores a back-reference to the Angular component for integration purposes.\n */\nexport interface GridCompHTMLElement extends GridHTMLElement {\n  /** Back-reference to the Angular GridStack component */\n  _gridComp?: GridstackComponent;\n}\n\n/**\n * Mapping of selector strings to Angular component types.\n * Used for dynamic component creation based on widget selectors.\n */\nexport type SelectorToType = {[key: string]: Type<Object>};\n\n/**\n * Angular component wrapper for GridStack.\n * \n * This component provides Angular integration for GridStack grids, handling:\n * - Grid initialization and lifecycle\n * - Dynamic component creation and management\n * - Event binding and emission\n * - Integration with Angular change detection\n * \n * Use in combination with GridstackItemComponent for individual grid items.\n * \n * @example\n * ```html\n * <gridstack [options]=\"gridOptions\" (change)=\"onGridChange($event)\">\n *   <div empty-content>Drag widgets here</div>\n * </gridstack>\n * ```\n */\n@Component({\n  selector: 'gridstack',\n  template: `\n    <!-- content to show when when grid is empty, like instructions on how to add widgets -->\n    <ng-content select=\"[empty-content]\" *ngIf=\"isEmpty\"></ng-content>\n    <!-- where dynamic items go -->\n    <ng-template #container></ng-template>\n    <!-- where template items go -->\n    <ng-content></ng-content>\n  `,\n  styles: [`\n    :host { display: block; }\n  `],\n  standalone: true,\n  imports: [NgIf]\n  // changeDetection: ChangeDetectionStrategy.OnPush, // IFF you want to optimize and control when ChangeDetection needs to happen...\n})\nexport class GridstackComponent implements OnInit, AfterContentInit, OnDestroy {\n\n  /**\n   * List of template-based grid items (not recommended approach).\n   * Used to sync between DOM and GridStack internals when items are defined in templates.\n   * Prefer dynamic component creation instead.\n   */\n  @ContentChildren(GridstackItemComponent) public gridstackItems?: QueryList<GridstackItemComponent>;\n  /**\n   * Container for dynamic component creation (recommended approach).\n   * Used to append grid items programmatically at runtime.\n   */\n  @ViewChild('container', { read: ViewContainerRef, static: true}) public container?: ViewContainerRef;\n\n  /**\n   * Grid configuration options.\n   * Can be set before grid initialization or updated after grid is created.\n   * \n   * @example\n   * ```typescript\n   * gridOptions: GridStackOptions = {\n   *   column: 12,\n   *   cellHeight: 'auto',\n   *   animate: true\n   * };\n   * ```\n   */\n  @Input() public set options(o: GridStackOptions) {\n    if (this._grid) {\n      this._grid.updateOptions(o);\n    } else {\n      this._options = o;\n    }\n  }\n  /** Get the current running grid options */\n  public get options(): GridStackOptions { return this._grid?.opts || this._options || {}; }\n\n  /**\n   * Controls whether empty content should be displayed.\n   * Set to true to show ng-content with 'empty-content' selector when grid has no items.\n   * \n   * @example\n   * ```html\n   * <gridstack [isEmpty]=\"gridItems.length === 0\">\n   *   <div empty-content>Drag widgets here to get started</div>\n   * </gridstack>\n   * ```\n   */\n  @Input() public isEmpty?: boolean;\n\n  /**\n   * GridStack event emitters for Angular integration.\n   * \n   * These provide Angular-style event handling for GridStack events.\n   * Alternatively, use `this.grid.on('event1 event2', callback)` for multiple events.\n   * \n   * Note: 'CB' suffix prevents conflicts with native DOM events.\n   * \n   * @example\n   * ```html\n   * <gridstack (changeCB)=\"onGridChange($event)\" (droppedCB)=\"onItemDropped($event)\">\n   * </gridstack>\n   * ```\n   */\n  \n  /** Emitted when widgets are added to the grid */\n  @Output() public addedCB = new EventEmitter<nodesCB>();\n  \n  /** Emitted when grid layout changes */\n  @Output() public changeCB = new EventEmitter<nodesCB>();\n  \n  /** Emitted when grid is disabled */\n  @Output() public disableCB = new EventEmitter<eventCB>();\n  \n  /** Emitted during widget drag operations */\n  @Output() public dragCB = new EventEmitter<elementCB>();\n  \n  /** Emitted when widget drag starts */\n  @Output() public dragStartCB = new EventEmitter<elementCB>();\n  \n  /** Emitted when widget drag stops */\n  @Output() public dragStopCB = new EventEmitter<elementCB>();\n  \n  /** Emitted when widget is dropped */\n  @Output() public droppedCB = new EventEmitter<droppedCB>();\n  \n  /** Emitted when grid is enabled */\n  @Output() public enableCB = new EventEmitter<eventCB>();\n  \n  /** Emitted when widgets are removed from the grid */\n  @Output() public removedCB = new EventEmitter<nodesCB>();\n  \n  /** Emitted during widget resize operations */\n  @Output() public resizeCB = new EventEmitter<elementCB>();\n  \n  /** Emitted when widget resize starts */\n  @Output() public resizeStartCB = new EventEmitter<elementCB>();\n  \n  /** Emitted when widget resize stops */\n  @Output() public resizeStopCB = new EventEmitter<elementCB>();\n\n  /**\n   * Get the native DOM element that contains grid-specific fields.\n   * This element has GridStack properties attached to it.\n   */\n  public get el(): GridCompHTMLElement { return this.elementRef.nativeElement; }\n\n  /**\n   * Get the underlying GridStack instance.\n   * Use this to access GridStack API methods directly.\n   * \n   * @example\n   * ```typescript\n   * this.gridComponent.grid.addWidget({x: 0, y: 0, w: 2, h: 1});\n   * ```\n   */\n  public get grid(): GridStack | undefined { return this._grid; }\n\n  /**\n   * Component reference for dynamic component removal.\n   * Used internally when this component is created dynamically.\n   */\n  public ref: ComponentRef<GridstackComponent> | undefined;\n\n  /**\n   * Mapping of component selectors to their types for dynamic creation.\n   * \n   * This enables dynamic component instantiation from string selectors.\n   * Angular doesn't provide public access to this mapping, so we maintain our own.\n   * \n   * @example\n   * ```typescript\n   * GridstackComponent.addComponentToSelectorType([MyWidgetComponent]);\n   * ```\n   */\n  public static selectorToType: SelectorToType = {};\n  /**\n   * Register a list of Angular components for dynamic creation.\n   * \n   * @param typeList Array of component types to register\n   * \n   * @example\n   * ```typescript\n   * GridstackComponent.addComponentToSelectorType([\n   *   MyWidgetComponent,\n   *   AnotherWidgetComponent\n   * ]);\n   * ```\n   */\n  public static addComponentToSelectorType(typeList: Array<Type<Object>>) {\n    typeList.forEach(type => GridstackComponent.selectorToType[ GridstackComponent.getSelector(type) ] = type);\n  }\n  /**\n   * Extract the selector string from an Angular component type.\n   * \n   * @param type The component type to get selector from\n   * @returns The component's selector string\n   */\n  public static getSelector(type: Type<Object>): string {\n    return reflectComponentType(type)!.selector;\n  }\n\n  protected _options?: GridStackOptions;\n  protected _grid?: GridStack;\n  protected _sub: Subscription | undefined;\n  protected loaded?: boolean;\n\n  constructor(protected readonly elementRef: ElementRef<GridCompHTMLElement>) {\n    // set globally our method to create the right widget type\n    if (!GridStack.addRemoveCB) {\n      GridStack.addRemoveCB = gsCreateNgComponents;\n    }\n    if (!GridStack.saveCB) {\n      GridStack.saveCB = gsSaveAdditionalNgInfo;\n    }\n    if (!GridStack.updateCB) {\n      GridStack.updateCB = gsUpdateNgComponents;\n    }\n    this.el._gridComp = this;\n  }\n\n  public ngOnInit(): void {\n    // init ourself before any template children are created since we track them below anyway - no need to double create+update widgets\n    this.loaded = !!this.options?.children?.length;\n    this._grid = GridStack.init(this._options, this.el);\n    delete this._options; // GS has it now\n\n    this.checkEmpty();\n  }\n\n  /** wait until after all DOM is ready to init gridstack children (after angular ngFor and sub-components run first) */\n  public ngAfterContentInit(): void {\n    // track whenever the children list changes and update the layout...\n    this._sub = this.gridstackItems?.changes.subscribe(() => this.updateAll());\n    // ...and do this once at least unless we loaded children already\n    if (!this.loaded) this.updateAll();\n    this.hookEvents(this.grid);\n  }\n\n  public ngOnDestroy(): void {\n    this.unhookEvents(this._grid);\n    this._sub?.unsubscribe();\n    this._grid?.destroy();\n    delete this._grid;\n    delete this.el._gridComp;\n    delete this.container;\n    delete this.ref;\n  }\n\n  /**\n   * called when the TEMPLATE (not recommended) list of items changes - get a list of nodes and\n   * update the layout accordingly (which will take care of adding/removing items changed by Angular)\n   */\n  public updateAll() {\n    if (!this.grid) return;\n    const layout: GridStackWidget[] = [];\n    this.gridstackItems?.forEach(item => {\n      layout.push(item.options);\n      item.clearOptions();\n    });\n    this.grid.load(layout); // efficient that does diffs only\n  }\n\n  /** check if the grid is empty, if so show alternative content */\n  public checkEmpty() {\n    if (!this.grid) return;\n    this.isEmpty = !this.grid.engine.nodes.length;\n  }\n\n  /** get all known events as easy to use Outputs for convenience */\n  protected hookEvents(grid?: GridStack) {\n    if (!grid) return;\n    // nested grids don't have events in v12.1+ so skip\n    if (grid.parentGridNode) return;\n    grid\n      .on('added', (event: Event, nodes: GridStackNode[]) => {\n        const gridComp = (nodes[0].grid?.el as GridCompHTMLElement)._gridComp || this;\n        gridComp.checkEmpty();\n        this.addedCB.emit({event, nodes});\n      })\n      .on('change', (event: Event, nodes: GridStackNode[]) => this.changeCB.emit({event, nodes}))\n      .on('disable', (event: Event) => this.disableCB.emit({event}))\n      .on('drag', (event: Event, el: GridItemHTMLElement) => this.dragCB.emit({event, el}))\n      .on('dragstart', (event: Event, el: GridItemHTMLElement) => this.dragStartCB.emit({event, el}))\n      .on('dragstop', (event: Event, el: GridItemHTMLElement) => this.dragStopCB.emit({event, el}))\n      .on('dropped', (event: Event, previousNode: GridStackNode, newNode: GridStackNode) => this.droppedCB.emit({event, previousNode, newNode}))\n      .on('enable', (event: Event) => this.enableCB.emit({event}))\n      .on('removed', (event: Event, nodes: GridStackNode[]) => {\n        const gridComp = (nodes[0].grid?.el as GridCompHTMLElement)._gridComp || this;\n        gridComp.checkEmpty();\n        this.removedCB.emit({event, nodes});\n      })\n      .on('resize', (event: Event, el: GridItemHTMLElement) => this.resizeCB.emit({event, el}))\n      .on('resizestart', (event: Event, el: GridItemHTMLElement) => this.resizeStartCB.emit({event, el}))\n      .on('resizestop', (event: Event, el: GridItemHTMLElement) => this.resizeStopCB.emit({event, el}))\n  }\n\n  protected unhookEvents(grid?: GridStack) {\n    if (!grid) return;\n    // nested grids don't have events in v12.1+ so skip\n    if (grid.parentGridNode) return;\n    grid.off('added change disable drag dragstart dragstop dropped enable removed resize resizestart resizestop');\n  }\n}\n\n/**\n * can be used when a new item needs to be created, which we do as a Angular component, or deleted (skip)\n **/\nexport function gsCreateNgComponents(host: GridCompHTMLElement | HTMLElement, n: NgGridStackNode, add: boolean, isGrid: boolean): HTMLElement | undefined {\n  if (add) {\n    //\n    // create the component dynamically - see https://angular.io/docs/ts/latest/cookbook/dynamic-component-loader.html\n    //\n    if (!host) return;\n    if (isGrid) {\n      // TODO: figure out how to create ng component inside regular Div. need to access app injectors...\n      // if (!container) {\n      //   const hostElement: Element = host;\n      //   const environmentInjector: EnvironmentInjector;\n      //   grid = createComponent(GridstackComponent, {environmentInjector, hostElement})?.instance;\n      // }\n\n      const gridItemComp = (host.parentElement as GridItemCompHTMLElement)?._gridItemComp;\n      if (!gridItemComp) return;\n      // check if gridItem has a child component with 'container' exposed to create under..\n      const container = (gridItemComp.childWidget as any)?.container || gridItemComp.container;\n      const gridRef = container?.createComponent(GridstackComponent);\n      const grid = gridRef?.instance;\n      if (!grid) return;\n      grid.ref = gridRef;\n      grid.options = n;\n      return grid.el;\n    } else {\n      const gridComp = (host as GridCompHTMLElement)._gridComp;\n      const gridItemRef = gridComp?.container?.createComponent(GridstackItemComponent);\n      const gridItem = gridItemRef?.instance;\n      if (!gridItem) return;\n      gridItem.ref = gridItemRef\n\n      // define what type of component to create as child, OR you can do it GridstackItemComponent template, but this is more generic\n      const selector = n.selector;\n      const type = selector ? GridstackComponent.selectorToType[selector] : undefined;\n      if (type) {\n        // shared code to create our selector component\n        const createComp = () => {\n          const childWidget = gridItem.container?.createComponent(type)?.instance as BaseWidget;\n          // if proper BaseWidget subclass, save it and load additional data\n          if (childWidget && typeof childWidget.serialize === 'function' && typeof chi