mat-slide-toggle shouldn't change it's state when I click cancel in confirmation window

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05-09-2024

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Preventing Unintended State Changes with mat-slide-toggle and Confirmation Dialogs

When working with Angular Material's mat-slide-toggle, it's common to implement confirmation dialogs to prevent accidental changes. However, the default behavior might lead to unexpected state changes. Let's explore a solution to this issue, drawing insights from a Stack Overflow question: https://stackoverflow.com/questions/65176030/mat-slide-toggle-shouldnt-change-its-state-when-i-click-cancel-in-confirmation-window.

Understanding the Problem

The original code attempts to use stopPropagation() to prevent the mat-slide-toggle from changing its state when the confirmation dialog's "cancel" button is clicked. However, this approach doesn't work as intended. The reason lies in how mat-slide-toggle handles its state change events.

The Solution: Direct Control

Instead of relying on event propagation, the best way to control the mat-slide-toggle's state within a confirmation dialog is to directly manage its checked property.

Here's a modified version of the code:

change(e) {
  if (this.checked) {
    if (confirm("Are you sure?")) {
      // Proceed with the toggle state change
      console.log("toggle");
      this.checked = false; // Update the checked property
    } else {
      // Prevent the toggle from changing state
      console.log("toggle should not change if I click the cancel button");
      // Do nothing, the checked property remains unchanged
    }
  }
}

In this revised code:

1. We check if the checked property is true (meaning the user is trying to uncheck the toggle).

2. We present the confirmation dialog.

3. If the user confirms, we update the checked property to false, effectively changing the toggle state.

4. If the user cancels, we simply do nothing. The checked property remains true, preventing the mat-slide-toggle from changing its state.

Key Takeaways

• Direct Control: When dealing with confirmation dialogs, directly manage the checked property of the mat-slide-toggle to ensure accurate state control.
• Event Propagation Limitations: stopPropagation() might not always be sufficient when working with Angular Material components.
• State Management: Understand how the component's internal state is managed and update it accordingly.

Additional Considerations

• For more complex scenarios, you might consider using reactive forms to manage the mat-slide-toggle state.
• Consider using a dedicated component for handling confirmation dialogs, separating UI and logic for better organization.

By understanding the intricacies of mat-slide-toggle and implementing a direct control approach, you can ensure your confirmation dialogs work as intended, preventing unexpected state changes and providing a seamless user experience.