响应式设计使用角度2中的md-grid-list

Question

我正在研究Angular 2中md-grid-list的基本示例.

HTML代码:

<md-grid-list cols="4" rowHeight="100px">
   <md-grid-tile *ngFor="let tile of tiles"
         [colspan]="tile.cols"
         [rowspan]="tile.rows"
         [style.background]="tile.color">
         {{tile.text}}
    </md-grid-tile>
</md-grid-list>

TS代码:

export class GridListDynamicExample {
  tiles = [
    {text: 'One', cols: 3, rows: 1, color: 'lightblue'},
    {text: 'Two', cols: 1, rows: 2, color: 'lightgreen'},
    {text: 'Three', cols: 1, rows: 1, color: 'lightpink'},
    {text: 'Four', cols: 2, rows: 1, color: '#DDBDF1'},
  ];
}

上面的代码导致了这个: 如何使用某些HTML指令或CSS将布局设置为"列""列",以便在较小屏幕尺寸下的行(一和四)下方？

Angular 1中的Angular Material可以选择通过指定"md-cols-xs ="1"md-cols-sm ="2"md-cols-md ="4"md-cols-gt-md ="6" ".

Answer 1

这是最简单的方法,你可以实现:)

your.component.html

<md-card class="sub-category-grid" style="padding:0px;" (window:resize)="onResize($event)">

  <md-grid-list cols="{{test}}" rowHeight="1:1">
     <md-grid-tile *ngFor="let item of Items"> 
       {{item.title}}
    </md-grid-tile>
 </md-grid-list>

</md-card>

your.component.ts

// init this var with the default number of columns
test: any = 2;

Items: any = [
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" },
    {title: "title", img_src: "../../../assets/img/-samples/raketa.png", description: "Description" }
  ]


constructor() { }

ngOnInit() {

}


onResize(event) {
    const element = event.target.innerWidth;
    console.log(element);


    if (element < 950) {
      this.test = 2;
    }

    if (element > 950) {
      this.test = 3;
    }

    if (element < 750) {
      this.test = 1;
    }
  }

Answer 2

您可以将指令添加到组件中，然后像这样在指令中进行工作；

import { Directive, ElementRef, Input, HostListener, Output } from '@angular/core';
import * as _ from  "lodash";
@Directive({ selector: '[myResponsive]' })

export class TestDirective {
  @Input() tiles;

  @HostListener('window:resize', ['$event'])
  onResize(event) {
    if (event.target.innerWidth < 980) {
      _.each(this.tiles, tile => {
        tile.cols = 2;
        tile.rows = 1;
      });
    } else {
      this.tiles = [
        {text: 'One', cols: 3, rows: 1, color: 'lightblue'},
        {text: 'Two', cols: 1, rows: 2, color: 'lightgreen'},
        {text: 'Three', cols: 1, rows: 1, color: 'lightpink'},
        {text: 'Four', cols: 2, rows: 1, color: '#DDBDF1'}
      ];
    }
  }

  constructor(el: ElementRef) {

  }
}

您还需要将指令添加到 app.module.ts

import { TestDirective } from "./test.directive";
@NgModule({
  imports: [
      ...
  ],
  declarations: [
     TestDirective
  ]

你的 HTML 应该是这样的

<md-grid-list cols="4" rowHeight="100px">
   <md-grid-tile myResponsive [(tiles)]="tiles" *ngFor="let tile of tiles"
         [colspan]="tile.cols"
         [rowspan]="tile.rows"
         [style.background]="tile.color">
         {{tile.text}}
    </md-grid-tile>
</md-grid-list>