Disabling the <md-expansion-panel> in Angular2 Material2: A Step-by-Step Guide

I am encountering some difficulties with the official documentation of material design, they mentioned

Expansion panels can be disabled using the disabled attribute. A disabled expansion panel can't be toggled by the user, but can still be manipulated programmatically.

<mat-expansion-panel [disabled]="isDisabled">
  <mat-expansion-panel-header>
    This is the expansion title
  </mat-expansion-panel-header>
  <mat-panel-description>
    This is a summary of the content
  </mat-panel-description>
</mat-expansion-panel>

However, when I attempt to implement it, I encounter an error-

Uncaught Error: Template parse errors:
Can't bind to 'disabled' since it isn't a known property of 'md-expansion-panel'.
1. If 'md-expansion-panel' is an Angular component and it has 'disabled' input, then verify that it is part of this module.
2. If 'md-expansion-panel' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("

            <md-expansion-panel
            [ERROR ->][disabled]="true"

               routerLink="/settings/tools"
")

Any assistance would be greatly appreciated.

angulartypescriptangular-materialangular2-template

Answer №1

<mat-expansion-panel [disabled]="isExpanded">
  <mat-expansion-panel-header>
    This is the title of the expansion panel
  </mat-expansion-panel-header>
  <mat-panel-summary>
    This provides a brief overview of the content
  </mat-panel-summary>
</mat-expansion-panel>

component.ts

Setting disabled to true - this.isExpanded = true;

Setting disabled to false - this.isExpanded = false;

Answer №2

The 'disabled' property can be used to immediately disable user interaction on an expansion panel. Simply set the property to disabled to deactivate any panel.

<mat-expansion-panel disabled>
  <mat-expansion-panel-header>
    This is the expansion title
  </mat-expansion-panel-header>
  <mat-panel-description>
    This is a summary of the content
  </mat-panel-description>
</mat-expansion-panel>

If you need to programmatically disable the panel, you can refer to the following code snippet that has worked for me.
Note: The < CONDITION > should result in either true or false

<mat-expansion-panel [disabled]="<CONDITION>">
  <mat-expansion-panel-header>
    This is the expansion title
  </mat-expansion-panel-header>
  <mat-panel-description>
    This is a summary of the content
  </mat-panel-description>
</mat-expansion-panel>

Answer №3

Upon examining the mat-expansion-panel code (selector: 'mat-expansion-panel'), I noted that it includes 'disabled' as one of its inputs (inputs: ['disabled', 'expanded']), although it does not appear to be utilized.

Could I propose a potential solution: Apply pointer-events: none to the mat-expansion-panel.

Answer №4

this is a great example

<app-carousel [autoplay]="true" class="carousel-slide">
      <app-slide>
        <app-slide-title>Latest Products</app-slide-title>
      </app-slide>
    </app-carousel>

Answer №5

Disable expansion panels by simply adding the disabled attribute. This prevents users from toggling the panel, while still allowing for programmatic manipulation.

"mat-expansion-panel disabled"

To disable, include the disabled attribute within the opening mat-expansion-panel tag.

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