What are the steps to input the ngForOf template to the component using content projection through Angular?-JS Tutorial-php.cn

This article mainly introduces the method of Angular using content projection to input the ngForOf template into the component. Now I share it with you and give it as a reference.

Now, we write a component puppiesListCmp to display a list of puppies:

//puppies-list.component.ts @Component({ selector: 'puppies-list', template: `  {{puppy.name}} {{puppy.age}} {{puppy.color}} 
 ` }) export class puppiesListCmp{ @Input() puppies: Puppy[]; } interface Puppy { name: string, age: number, color: string }

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Then use it like this:

//app.component.ts @Component({ selector: 'my-app', template: `  ` }) export class App{ puppies = [ { name: "sam", age: 0.6, color: "yellow" }, { name: "bingo", age: 1.5, color: "black" } ] }

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The effect will be like this:

However, I hope that our puppiesListCmp component can meet different needs , for example, only the name and color of the puppy are displayed when the data remains unchanged, like this:

This is the focus of this article. We need to implement user-defined templates!

Now we don’t hard-code the component template, but let the user input from the outside!

First, our component template:

 {{puppy.name}} {{puppy.age}} {{puppy.color}}

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is equivalent to:

  {{puppy.name}} {{puppy.age}} {{puppy.color}}

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Then, use @ContentChild (about @ContentChild, you can view it here, FQ is required ) obtains the external (relative to the puppiesListCmp component) custom template and assigns it to ngForTemplate. In other words, this part:

 {{puppy.name}} {{puppy.age}} {{puppy.color}}

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is no longer hard-coded in the component as before, but is customized by the user in the parent component. Then use Angular's Content Projection to project it into the puppiesListCmp component. Like this:

//puppies-list.component.ts import { Component, Input, ContentChild, TemplateRef } from '@angular/core'; import { NgForOfContext } from '@angular/common'; @Component({ selector: 'puppies-list', template: `  ` }) export class puppiesListCmp{ @Input() puppies: Puppy[]; @ContentChild(TemplateRef) tpl: TemplateRef> } interface Puppy { name: string, age: number, color: string }

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This way our component is complete. Then we use it:

//app.component.ts @Component({ selector: 'my-app', template: `    {{puppy.name}} {{puppy.age}} {{puppy.color}} 
   ` })

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The effect is still the same:

If we just To display the puppy’s name and color, just write it like this:

//app.component.ts @Component({ selector: 'my-app', template: `    {{puppy.name}} {{puppy.color}} 
   ` })

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The effect is like this:

Such components are very flexible and can be customized to whatever effect you want, which realizes the reuse of components.

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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