Resolving Offset Drawing Issue with Signature Component in Ionic Environment

Updated on Jan 20, 2026

Environment

Product

Progress® Kendo UI for Angular Signature

Description

When integrating the Kendo UI Signature component for Angular in an Ionic Framework application, the drawn lines appear offset from where the screen is touched. This issue arises in scenarios where the Ionic Framework makes CSS or layout changes after the Signature component is rendered, affecting the component's ability to accurately capture the signature.

Cause

The offset in the drawing occurs because the Ionic Framework executes CSS and layout adjustments after rendering the Kendo UI Signature component. These adjustments disrupt the Signature component's coordinate system, leading to a mismatch between the touch point and the displayed drawing.

Solution

To mitigate this issue, ensure that the Signature component is not displayed before the Ionic Framework has completed its layout adjustments. To achieve this, leverage Ionic's lifecycle events to control the visibility of the Signature component. The following example demonstrates how to delay the rendering of the Signature component until the Ionic page has fully entered the view, ensuring that all layout adjustments have been finalized.

1. In your application, wrap the <kendo-signature> component in a @if block to conditionally render it based on a flag that indicates the completion of Ionic's layout adjustments.

   html

   <ion-app>
     <ion-content>
       @if(isLoaded){
       <kendo-signature> </kendo-signature>
       }
       <ion-router-outlet></ion-router-outlet>
     </ion-content>
   </ion-app>

2. Utilize the ionViewDidEnter lifecycle hook to set the flag to true, signaling that the Ionic Framework has finished its layout changes and it's safe to render the Signature component.

   typescript

   export class SignaturePage implements ViewDidEnter {
     isLoaded = false;
   
     public ionViewDidEnter(): void {
       this.isLoaded = true;
     }
   }

Ensure proper routing setup in your Ionic Angular application for the ionViewDidEnter lifecycle hook to trigger correctly.

To see the above solution in action, refer to the following StackBlitz example.

See Also

• Kendo UI Signature Documentation
• Signature Component API Reference