Angular CDK Drag and Drop: Cancel drag-action

Angular CDK Drag and Drop: Cancel drag-action

In Angular CDK Drag and Drop, canceling a drag action can be achieved by handling the cdkDragStarted event and conditionally preventing the drag operation based on your requirements. Here's how you can implement it:

1. Use the cdkDragStarted Event

You can use the cdkDragStarted event provided by Angular CDK to intercept the start of a drag operation and cancel it if needed.

<div cdkDrag (cdkDragStarted)="onDragStarted($event)" [cdkDragDisabled]="isDragDisabled"> Drag me </div>
  • cdkDrag: Directives that mark an element as draggable.
  • (cdkDragStarted): Event that triggers when drag starts.
  • [cdkDragDisabled]: Conditionally disables dragging based on isDragDisabled boolean.

2. Implement the onDragStarted Method

In your component class, define the onDragStarted method to handle the drag start event and conditionally cancel the drag action.

import { Component } from '@angular/core'; import { CdkDragStart } from '@angular/cdk/drag-drop'; @Component({ selector: 'app-draggable', templateUrl: './draggable.component.html', styleUrls: ['./draggable.component.css'] }) export class DraggableComponent { isDragDisabled = false; onDragStarted(event: CdkDragStart) { // Check conditions to cancel the drag action if (this.isDragDisabled) { event.source._dragRef.reset(); // Reset the drag position if needed event.source._dragRef.disabled = true; // Disable the drag operation } } }

Explanation:

  • isDragDisabled: This boolean variable controls whether dragging is allowed (false) or canceled (true).
  • onDragStarted Method: Handles the cdkDragStarted event. It checks isDragDisabled and cancels the drag action by resetting the drag position and disabling the drag reference.

Additional Considerations:

  • Resetting Drag Position: Use event.source._dragRef.reset() to reset the drag position if the drag action should not initiate.
  • Disabling Drag: Setting event.source._dragRef.disabled = true disables the drag operation effectively canceling the drag action.
  • Visual Feedback: Provide appropriate visual feedback to users when dragging is disabled or canceled.

Conclusion:

By using the cdkDragStarted event and handling it in your component class, you can implement conditional drag cancelation in Angular CDK Drag and Drop. This approach allows you to dynamically control when drag operations should begin based on your application's logic and user interactions.

Examples

  1. How to cancel drag action on specific condition in Angular CDK Drag and Drop?

    • Description: This query focuses on preventing drag actions based on specific conditions during a drag and drop operation.
    • Code Implementation:
      import { CdkDragStart, CdkDrag } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag (cdkDragStarted)="onDragStarted($event)">Drag me</div> // TypeScript onDragStarted(event: CdkDragStart) { if (/* your condition to cancel drag */) { event.source._dragRef._disableHandleClickDefault(); } }

  2. How to disable drag based on dynamic conditions in Angular CDK Drag and Drop?

    • Description: This query addresses dynamically disabling drag based on conditions that may change during the application lifecycle.
    • Code Implementation:
      import { CdkDrag, CdkDragStart } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag [cdkDragDisabled]="isDragDisabled">Drag me</div> // TypeScript isDragDisabled = false; toggleDrag() { this.isDragDisabled = !this.isDragDisabled; }

  3. How to conditionally disable drop based on drag properties in Angular CDK Drag and Drop?

    • Description: This query involves disabling drop actions based on the properties or state of the item being dragged.
    • Code Implementation:
      import { CdkDropList, CdkDragEnter, CdkDragExit } from '@angular/cdk/drag-drop'; // HTML template <div cdkDropList (cdkDragEnter)="onDragEnter($event)" (cdkDragExit)="onDragExit($event)"> <div cdkDrag>Drop here</div> </div> // TypeScript onDragEnter(event: CdkDragEnter) { if (/* your condition to cancel drop */) { event.container._dropListRef.disabled = true; } } onDragExit(event: CdkDragExit) { event.container._dropListRef.disabled = false; }

  4. How to prevent drag start on certain elements using Angular CDK Drag and Drop?

    • Description: This query focuses on preventing the start of drag actions based on specific elements or conditions.
    • Code Implementation:
      import { CdkDragStart } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag (cdkDragStarted)="onDragStarted($event)">Drag me</div> // TypeScript onDragStarted(event: CdkDragStart) { if (/* your condition to cancel drag */) { event.preventDefault(); } }

  5. How to disable drag handle dynamically in Angular CDK Drag and Drop?

    • Description: This query addresses dynamically disabling drag handles based on changing conditions or user interactions.
    • Code Implementation:
      import { CdkDragHandle } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag [cdkDragHandleDisabled]="isHandleDisabled">Drag me</div> // TypeScript isHandleDisabled = false; toggleHandle() { this.isHandleDisabled = !this.isHandleDisabled; }

  6. How to cancel drag and drop based on mouse position in Angular CDK?

    • Description: This query involves canceling drag and drop operations based on the position of the mouse pointer.
    • Code Implementation:
      import { CdkDragDrop, CdkDragStart } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag (cdkDragStarted)="onDragStarted($event)">Drag me</div> // TypeScript onDragStarted(event: CdkDragStart) { const mousePositionX = event.event.clientX; const mousePositionY = event.event.clientY; if (/* your condition to cancel drag based on mouse position */) { event.source._dragRef._disableHandleClickDefault(); } }

  7. How to disable drop for specific items in Angular CDK Drag and Drop?

    • Description: This query addresses disabling drop actions for specific draggable items within a drop zone.
    • Code Implementation:
      import { CdkDropList } from '@angular/cdk/drag-drop'; // HTML template <div cdkDropList [cdkDropListDisabled]="isDropDisabled"> <div cdkDrag>Item 1</div> <div cdkDrag>Item 2</div> </div> // TypeScript isDropDisabled = false; toggleDrop() { this.isDropDisabled = !this.isDropDisabled; }

  8. How to prevent drop based on item properties in Angular CDK Drag and Drop?

    • Description: This query involves preventing drop actions based on specific properties or conditions of the draggable item.
    • Code Implementation:
      import { CdkDropList, CdkDragDrop } from '@angular/cdk/drag-drop'; // HTML template <div cdkDropList (cdkDrop)="onDrop($event)"> <div cdkDrag *ngFor="let item of items" [cdkDragData]="item"> {{ item.name }} </div> </div> // TypeScript onDrop(event: CdkDragDrop<string[]>) { if (/* your condition to cancel drop */) { event.container._dropListRef.disabled = true; } }

  9. How to disable drag and drop based on user role in Angular CDK?

    • Description: This query addresses disabling drag and drop actions based on the role or permissions of the current user.
    • Code Implementation:
      import { CdkDrag, CdkDragStart } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag (cdkDragStarted)="onDragStarted($event)">Drag me</div> // TypeScript onDragStarted(event: CdkDragStart) { if (!this.userService.canDrag()) { event.preventDefault(); } }

  10. How to cancel drag and drop on specific conditions in Angular CDK Drag and Drop?

    • Description: This query involves canceling drag and drop operations based on specific business logic or conditions.
    • Code Implementation:
      import { CdkDrag, CdkDragStart } from '@angular/cdk/drag-drop'; // HTML template <div cdkDrag (cdkDragStarted)="onDragStarted($event)">Drag me</div> // TypeScript onDragStarted(event: CdkDragStart) { if (/* your condition to cancel drag */) { event.preventDefault(); } }

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