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ngx-cdk-responsive

This library provides a simple responsive directive that helps you switch templates on different sizes. It build on top of the @angular/cdk.

Installation

npm i ngx-cdk-responsive

Import in your module:

@NgModule({
  imports: [
    NgxCdkResponsiveModule
  ]
})

The library consists of two directives: responsive and responsiveSwitch + responsiveCase.

Two quick code examples:

<p *responsive="{'Small and smaller': onSmall}" >Default</p>
 
<ng-template #onSmall>
  <p>Small and smaller</p>
</ng-template>

<ng-container responsiveSwitch>
  <p *responsiveCase="'<= Small'">Small</p>
  <p *responsiveDefault>Default</p>
</ng-container>

Usage of responsive

The responsive directives is a structural directives added to any element. It takes a map of Breakpoint → TemplateRef pairs as input. The first breakpoint that matches will have its template rendered. If no breakpoints match the template in the host will be used.

<p *responsive="{'Small and smaller': onSmall, 'Medium': onMedium}">Default</p>
 
<ng-template #onSmall>
  <p>Small and smaller</p>
</ng-template>
<ng-template #onMedium>
  <p>Medium</p>
</ng-template>

Usage of responsiveSwitch

Create a wrapper element like ng-container with the responsiveSwitch directory and put your cases inside. The first matching case will be used.

<ng-container responsiveSwitch>
  <p *responsiveCase="'<= Small'">Small</p>
  <p *responsiveCase="'Medium'">Medium</p>
  <p *responsiveDefault>Default Fallback</p>
</ng-container>

Available Breakpoints

Both the responsive input object and responsiveCase directive take a string that describes the breakpoint. The following @angular/cdk breakpoints are available.

• XSmall
• Small
• Medium
• Large
• XLarge
• Handset
• Tablet
• Web
• HandsetPortrait
• TabletPortrait
• WebPortrait
• HandsetLandscape
• TabletLandscape
• WebLandscape

All breakpoints can be extended be either using the prefixes <= / >= or the suffixes and smaller / and larger. They mean the same.

Consider the following working example:

<ng-container responsiveSwitch>
  <!--<p *responsiveCase="'Small and smaller'">Small</p>-->
  <p *responsiveCase="'<= Small'">Small</p>
  <p *responsiveCase="'Medium'">Medium</p>
  <p *responsiveCase="'Large and larger'">Large</p>
  <!--<p *responsiveCase="'>=Large'">XLarge</p>-->
</ng-container>

<p *responsiveCase="'<= Small and larger'">Small</p> will not work.

observe and update

Both main directives have an input observe, that determine on which breakpoint changes the templates should be updated. When a template is rendered the output (update) will emit.

Unfortunately structural directives don't have outputs. For the responsive write

<p *responsive="{'Small and smaller': none}; observe: observePoints; update: onChange$">Default</p>
<ng-template #none></ng-template>

onChange$ = new Subject<string>();
 
ngOnInit() {
  this.onChange$.subscribe(val => this.hasChanged("onChange$: " + val));
}

observe

The value of observe is an array of strings that represent queries.

See https://material.angular.io/cdk/layout/overview#react-to-changes-to-the-viewport

<ng-container responsiveSwitch [observe]="observePoints" (update)="hasChanged($event)">
  <p *responsiveCase="'Small'">Small</p>
  <p *responsiveCase="'Medium'">Medium</p>
  <p *responsiveCase="'Large and larger'">Large</p>
</ng-container>

import {Observe} from 'ngx-cdk-responsive';
// ...
observePoints = [Observe.ORIENTATION, ...Observe.ANY_WINDOW_CHANGE];
 
hasChanged(newSize: string) {
  console.log('newSize:', newSize);
}

The Observe namespace contain triggers for the following cases:

• ORIENTATION → orientation changes
• MAX_WIDTH(value: number, unit: string = "px") → max_width query matching changes (e.g. window was below given max_width, now above)
• MIN_WIDTH(value: number, unit: string = "px") → min_width query matching changes
• ANY_WINDOW_CHANGE → Whenever one of the 5 window sizes xs, s, m, l, xl changes.