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@gewd/lazy

v1.0.0

Published

Collection of functions around Angular Lazy-Loading Components and some other utils

Downloads

6

Readme

@gewd/lazy

Collection of functions around Angular Lazy-Loading Components and some other utils

NPM Version Package Size

@gewd/lazy/utils

Like the C# Lazy-Class

// create
var myLazy = Lazy.create(() => import(/*...*/))

// callback/promise will be only executed once `.getValue()` is called
const result = await myLazy.getValue();

// once the value was loaded, it'll just use this cached promise

Lazy Components

Register the lazy component, without a module

DynamicLoaderRegistry.RegisterLazyComponent('test-comp',
  new Lazy<any>(() => import('./lazy-wrapper/test-comp'))
);

Use it inside your app with:

<gewd-lazy-component 
   [componentInputs]="{ testProp: 'Component Binding from outside' }"
   component="test-comp"
>
   Normal content that is visible the content isn't loaded.

   <div isLoading>
      This content will be visible while the component is loading / being created.
   </div>                  
</gewd-lazy-component>

Properties:

|Prop|Type|Description| | ---|----|-----------| |component|string|Key used in DynamicLoaderRegistry.LazyComponents| |componentInputs|InputMap|Key-Value map of the lazy loaded component properties| |componentOutputs|OutputMap| Map of outputs| |componentCreated|EventEmitter| Event when the component is created | |componentLoading|EventEmitter| Event when the component is loading |

Useful for components that don't need any other module's or using 3rd party web-components

Note, using components of the host-module not working yet. Got a fix ? Open a PR :+1:

Lazy Module Components

Register the GewdLazyModule to use the Components

GewdLazyLoaderModule 

// or with .withLazy

// outside of the Angular Module
const lazyModule = new Lazy(
            () => import(/* webpackChunkName: "markdown-example-module" */ './examples/markdown-example/markdown-example.module')
              .then(({MarkdownExampleModule}) => MarkdownExampleModule)
);


GewdLazyLoaderModule.withLazy([
      {
        moduleName: 'markdown-example',
        moduleConfig: {
          load: lazyModule
        }
      },
    ])

This is for component that needs other components in it, e.g. Angular Material.

// alternative to the .withLazy way
DynamicLoaderRegistry.RegisterLazyModuleComponent('test-module', {
  load: new Lazy<any>(
    () => import('./lazy-wrapper/test-module-comp')
    .then(({TestModule}) => TestModule)
  )
});

Your module need to implement LazyModule

@NgModule({
  declarations: [
    MyModuleComp // Your Component
  ],
  imports: [
    CommonModule,
    MatButtonModule // any dependent module
  ]
})
export class TestModule implements LazyModule {
  getComponents (): LazyModuleComponentInfo[] {
    return [
      {
        name: 'MyModuleComp',  // key to access it
        componentType: MyModuleComp  // your component
      }
    ];
  }
}

Use it inside your app with:

<gewd-lazy-module-component
    [componentInputs]="{ testProp: 'Module Component Example' }"
    [componentOutputs]="outputBinding"
    moduleAlias="test-module"
    component="MyModuleComp"
    >
   Normal content that is visible the content isn't loaded.

   <div isLoading>
      This content will be visible while the component is loading / being created.
   </div>  
</gewd-lazy-module-component>

Properties:

|Prop|Type|Description| | ---|----|-----------| |moduleAlias|string|Key used in DynamicLoaderRegistry.LazyModuleComponents| |component|string|Key used in getComponents| |componentInputs|InputMap|Key-Value map of the lazy loaded component properties| |componentOutputs|OutputMap| Map of outputs| |componentCreated|EventEmitter| Event when the component is created | |componentLoading|EventEmitter| Event when the component is loading |

Articles / Tutorials

  • https://dev.to/negue/lazy-loaded-components-in-angular-4lnd
  • https://dev.to/negue/lazy-loaded-components-2-c7e
  • https://dev.to/negue/lazy-loaded-components-3-extending-the-loader-59j5