Angular 5 Mat-grid列表响应

Question

我用第6列创建了网格列表,我希望网格标题在小屏幕设备上占据100%的宽度.现在它也在小屏幕上创建了6列

预期:一个网格标题仅占移动设备的100%空间

Answer 1

您必须根据屏幕宽度动态设置cols属性mat-grid-list.您必须决定mat-grid-list渲染1列版本的宽度断点.

HTML:

<mat-grid-list [cols]="breakpoint" rowHeight="2:0.5" (window:resize)="onResize($event)">
  <mat-grid-tile>1</mat-grid-tile>
  <mat-grid-tile>2</mat-grid-tile>
  <mat-grid-tile>3</mat-grid-tile>
  <mat-grid-tile>4</mat-grid-tile>
  <mat-grid-tile>5</mat-grid-tile>
  <mat-grid-tile>6</mat-grid-tile>
</mat-grid-list>

TS:

ngOnInit() {
    this.breakpoint = (window.innerWidth <= 400) ? 1 : 6;
}

onResize(event) {
  this.breakpoint = (event.target.innerWidth <= 400) ? 1 : 6;
}

Stackblitz演示在这里

希望这可以帮助!

Answer 2

我喜欢阿尔特斯的回答,但我希望有更多的断点.所以我使用FlexLayout ObservableMedia服务而不是onResize创建了一个带有一些断点的简单方法:

import { AfterContentInit, Component, ViewChild } from '@angular/core';

import { MediaChange, ObservableMedia } from '@angular/flex-layout';
import { MatGridList } from '@angular/material';

@Component({
  selector: 'app-grid',
  templateUrl: './grid.component.html',
  styleUrls: ['./grid.component.css']
})
export class GridComponent implements AfterContentInit {
  @ViewChild('grid') grid: MatGridList;

  gridByBreakpoint = {
    xl: 8,
    lg: 6,
    md: 4,
    sm: 2,
    xs: 1
  }

  constructor(private observableMedia: ObservableMedia) {}

  ngAfterContentInit() {
    this.observableMedia.asObservable().subscribe((change: MediaChange) => {
      this.grid.cols = this.gridByBreakpoint[change.mqAlias];
    });
  }
}

<span>Breakpoint: {{grid.cols}}</span>
<mat-grid-list #grid rowHeight="2:1">
  <mat-grid-tile>1</mat-grid-tile>
  <mat-grid-tile>2</mat-grid-tile>
  <mat-grid-tile>3</mat-grid-tile>
  <mat-grid-tile>4</mat-grid-tile>
  <mat-grid-tile>5</mat-grid-tile>
  <mat-grid-tile>6</mat-grid-tile>
  <mat-grid-tile>7</mat-grid-tile>
  <mat-grid-tile>8</mat-grid-tile>
</mat-grid-list>

请参阅https://stackblitz.com/edit/angular-responsive-material-grid-leocaseiro

Answer 3

如果需要可重用的解决方案,可以使用以下指令:

 
import { Directive, Input, OnInit } from '@angular/core';
import { MatGridList } from '@angular/material';
import { ObservableMedia, MediaChange } from '@angular/flex-layout';

export interface IResponsiveColumnsMap {
  xs?: number;
  sm?: number;
  md?: number;
  lg?: number;
  xl?: number;
}

// Usage: <mat-grid-list [responsiveCols]="{xs: 2, sm: 2, md: 4, lg: 6, xl: 8}">
@Directive({
  selector: '[responsiveCols]'
})
export class ResponsiveColsDirective implements OnInit {
  private countBySize: IResponsiveColumnsMap = {xs: 2, sm: 2, md: 4, lg: 6, xl: 8};

  public get cols(): IResponsiveColumnsMap {
    return this.countBySize;
  }

  @Input('responsiveCols')
  public set cols(map: IResponsiveColumnsMap) {
    if (map && ('object' === (typeof map))) {
      this.countBySize = map;
    }
  }

  public constructor(
    private grid: MatGridList,
    private media: ObservableMedia
  ) {
    this.initializeColsCount();
  }

  public ngOnInit(): void {
    this.initializeColsCount();

    this.media.asObservable()
      .subscribe((changes: MediaChange) => 
        this.grid.cols = this.countBySize[changes.mqAlias]
      );
  }

  private initializeColsCount(): void {
    Object.keys(this.countBySize).some( 
      (mqAlias: string): boolean => {
        const isActive = this.media.isActive(mqAlias);

        if (isActive) {
          this.grid.cols = this.countBySize[mqAlias];
        }

        return isActive;
    });
  }
}

Answer 4

我使用 BreakpointObserver 来实现这一点。

请参阅角度文档：https : //material.angular.io/cdk/layout/overview

import { Component, OnInit} from '@angular/core';
import { BreakpointObserver, Breakpoints } from '@angular/cdk/layout';


@Component({
  selector: 'app-index',
  templateUrl: './index.component.html',
  styleUrls: ['./index.component.css']
})
export class IndexComponent implements OnInit {

  cols : number;

  gridByBreakpoint = {
    xl: 3,
    lg: 3,
    md: 3,
    sm: 2,
    xs: 1
  }

  constructor(private breakpointObserver: BreakpointObserver) {
    this.breakpointObserver.observe([
      Breakpoints.XSmall,
      Breakpoints.Small,
      Breakpoints.Medium,
      Breakpoints.Large,
      Breakpoints.XLarge,
    ]).subscribe(result => {
      if (result.matches) {
        if (result.breakpoints[Breakpoints.XSmall]) {
          this.cols = this.gridByBreakpoint.xs;
        }
        if (result.breakpoints[Breakpoints.Small]) {
          this.cols = this.gridByBreakpoint.sm;
        }
        if (result.breakpoints[Breakpoints.Medium]) {
          this.cols = this.gridByBreakpoint.md;
        }
        if (result.breakpoints[Breakpoints.Large]) {
          this.cols = this.gridByBreakpoint.lg;
        }
        if (result.breakpoints[Breakpoints.XLarge]) {
          this.cols = this.gridByBreakpoint.xl;
        }
      }
    });
  }

  ngOnInit() {
  }
  
}

<mat-grid-list #grid [cols]="cols" rowHeight="20:11" gutterSize="20px" >
  <mat-grid-tile>1</mat-grid-tile>
  <mat-grid-tile>2</mat-grid-tile>
  <mat-grid-tile>3</mat-grid-tile>
  <mat-grid-tile>4</mat-grid-tile>
  <mat-grid-tile>5</mat-grid-tile>
  <mat-grid-tile>6</mat-grid-tile>
  <mat-grid-tile>7</mat-grid-tile>
  <mat-grid-tile>8</mat-grid-tile>
</mat-grid-list>

Answer 5

受到 Gr\xc3\xa9gory 答案的启发。

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如果您希望避免显式订阅可观察对象，可以使用异步管道。

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import { Component, OnInit} from \'@angular/core\';\nimport { BreakpointObserver, Breakpoints } from \'@angular/cdk/layout\';\nimport { Observable } from \'rxjs\';\nimport { map, shareReplay } from \'rxjs/operators\';\n\n\n@Component({\n  selector: \'app-index\',\n  templateUrl: \'./index.component.html\',\n  styleUrls: [\'./index.component.css\']\n})\nexport class IndexComponent {\n\ncols$: Observable<number> = this.breakpointObserver\n  .observe([Breakpoints.Small, Breakpoints.XSmall])\n  .pipe(\n    map((result) => {\n      if (result.breakpoints[Breakpoints.XSmall]) {\n        return 1;\n      } else if (result.breakpoints[Breakpoints.Small]) {\n        return 2;\n      } else {\n        return 3;\n      }\n    }),\n    shareReplay()\n  );\n\n  constructor(private breakpointObserver: BreakpointObserver) {\n  }\n\n  \n}

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<mat-grid-list [cols]="cols$ | async" rowHeight="20:11" gutterSize="20px" >\n  <mat-grid-tile>1</mat-grid-tile>\n  <mat-grid-tile>2</mat-grid-tile>\n  <mat-grid-tile>3</mat-grid-tile>\n  <mat-grid-tile>4</mat-grid-tile>\n  <mat-grid-tile>5</mat-grid-tile>\n  <mat-grid-tile>6</mat-grid-tile>\n  <mat-grid-tile>7</mat-grid-tile>\n  <mat-grid-tile>8</mat-grid-tile>\n</mat-grid-list>

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