Angular CDK provides drag-and-drop directives for sortable lists and transfers between lists, but it does not change your application’s data for you. Handle the drop event and update the backing collection yourself; otherwise, the displayed order and application state can diverge.
Set up Angular CDK drag and drop
The functionality is in the @angular/cdk/drag-drop package. Angular’s guide shows installing the CDK with the Angular CLI and importing the directives used by the component. For code that matches your project, consult the documentation for the Angular version you have installed.
- From your project directory, run
ng add @angular/cdk. - Import
CdkDropListandCdkDragin the component that uses them. In a standalone component, add them to itsimports; in a module-based project, import them in the relevant Angular module. - Mark the list container with
cdkDropListand each draggable item withcdkDrag.
See Angular’s drag-and-drop guide for the directive examples and setup details.
Make a sortable list and update its data
Bind the list’s (cdkDropListDropped) event to a handler. For reordering within one list, pass the collection and the event’s previousIndex and currentIndex to moveItemInArray.
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<div cdkDropList (cdkDropListDropped)="drop($event)">
<div *ngFor="let item of items" cdkDrag>{{ item }}</div>
</div>import { CdkDrag, CdkDropList, CdkDragDrop, moveItemInArray } from '@angular/cdk/drag-drop';
drop(event: CdkDragDrop<string[]>) {
moveItemInArray(this.items, event.previousIndex, event.currentIndex);
}The directives manage the drag interaction and visual sorting; they do not update your data model. The event handler is what keeps the collection in step with the order the user chose. Angular documents moveItemInArray for this same-list case in its guide.
A CdkDragDrop event also exposes the current and previous containers, whether the pointer is over a container, movement distance, drop point, and the native mouse or touch event. These fields are useful when deciding how to apply a drop. See the CdkDragDrop API.
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Move items between lists
To let users transfer items, connect the drop lists and update both collections in your drop handler. Use cdkDropListConnectedTo when the set of lists is known: it can reference another list instance or its ID. If lists are created dynamically, put them under cdkDropListGroup to connect the group automatically.
In a cross-list handler, use event.previousContainer to identify the source list and event.container for the destination. Remove the item from the source collection and insert it at the appropriate index in the destination collection. The CDK reports the drop; your application owns the data transfer. The guide and CdkDropList API describe list connections and drop-list behavior.
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Choose sorting, movement, and acceptance rules
Linear or wrapping layouts
A drop list sorts vertically by default. Set its orientation to horizontal for a single-row collection. For a wrapping layout that sorts in multiple directions, use mixed orientation. Unlike the transform-based sorting strategy, mixed orientation uses DOM movement and does not animate sorting.
Constrain where and how items move
- Use
cdkDragHandleto make only a designated part of an item start a drag. - Use
cdkDragLockAxisor list-level axis locking to constrain movement to one axis. - Disable an item, list, or handle when dragging or dropping should not be available.
- Use a drag-start delay, root element selector, or boundary element to configure drag behavior.
- Use an entry predicate to decide whether an item may enter a destination list, and a sort predicate to control valid positions within a list.
- Customize the drag preview or placeholder to change what appears during a drag.
These controls are exposed through the CdkDrag API, the CdkDropList API, and the guide. Use them to express the rules of your interface; continue to validate and update the application’s data in the drop handler.
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Enable automatic scrolling in a scrollable container
If draggable items are inside a scrollable element and automatic scrolling during a drag does not work, add cdkScrollable to that scrollable container. The CDK needs the directive to detect and control the container’s scrolling during drag operations.
<div class="scroll-container" cdkScrollable>
<div cdkDropList>
<div cdkDrag>An item</div>
</div>
</div>See Angular’s drag-and-drop guide for the scrolling requirement.
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