Angular6 Filter实现页面搜索的示例代码

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
 name: 'globalFilter'
})
export class GlobalFilterPipe implements PipeTransform {
 transform(items: any, filter: any, defaultFilter: boolean): any {
 if (!filter){
 return items;
 }

 if (!Array.isArray(items)){
 return items;
 }

 if (filter && Array.isArray(items)) {
 let filterKeys = Object.keys(filter);

 if (defaultFilter) {
 return items.filter(item =>
  filterKeys.reduce((x, keyName) =>
  (x && new RegExp(filter[keyName], 'gmi').test(item[keyName])) || filter[keyName] == "", true));
 }
 else {
 return items.filter(item => {
  return filterKeys.some((keyName) => {
  return new RegExp(filter[keyName], 'gmi').test(item[keyName]) || filter[keyName] == "";
  });
 });
 }
 }
 }
}

import { GlobalFilterPipe } from './shared/filter.pipe';

registerLocaleData(zh);

@NgModule({
 declarations: [
 GlobalFilterPipe,
 ]

<nz-input-group nzSearch nzSize="large" [nzSuffix]="suffixButton">
 <input type="text" [(ngModel)]="searchText" nz-input placeholder="input search text">
</nz-input-group>
<ng-template #suffixButton>
 <button nz-button nzType="primary" nzSize="large" nzSearch>Search</button>
</ng-template>
<br>
<br>
<nz-card *ngFor="let topData of topCategoriesData" nzTitle="{{topData.categoryName}}">
 <div nz-card-grid [ngStyle]="gridStyle" *ngFor="let secondData of topData.subCategories | globalFilter: {categoryName: searchText,categoryCode: searchText}" >
 
 <nz-collapse>
 <nz-collapse-panel [nzHeader]="secondData.categoryName+'('+secondData.categoryCode+')'" [nzActive]="false" [nzDisabled]="false">
 <nz-select style="width: 100%;" (nzOpenChange)="loadMore(secondData.categoryId)" nzPlaceHolder="请选择..." nzAllowClear>
  <nz-option *ngFor="let thirdData of thirdCategoriesData | globalFilter: {categoryName: searchText,categoryCode: searchText}" [nzValue]="thirdData.categoryId" [nzLabel]="thirdData.categoryName+'('+thirdData.categoryCode+')'"></nz-option>
  <nz-option *ngIf="isLoading" nzDisabled nzCustomContent>
  <i nz-icon type="loading" class="loading-icon"></i> Loading Data...
  </nz-option>
 </nz-select>
 </nz-collapse-panel>
 </nz-collapse>
 <!-- <a>{{secondData.categoryName}}</a><b>({{secondData.categoryCode}})</b> -->
 </div>
 <ng-template #extraTemplate>
 <a>二级分类数量：{{data.subCategories.length}}</a>
 </ng-template>
</nz-card>

import { Component, OnInit } from '@angular/core';
import { CategoryService } from '../category.service';

@Component({
 selector: 'app-category',
 templateUrl: '../pages/category.component.html',
 styleUrls: ['../pages/category.component.css']
})
export class CategoryComponent implements OnInit {
 //todo 搜索无法由下至上匹配1,2级数据
 public searchText:string;

 topCategoriesData=[];
 
 thirdCategoriesData=[];

 isLoading = false;

 constructor(private categoryService:CategoryService) { }
 loadMore(id): void {
 this.isLoading = true;
 this.categoryService.getThirdById(id).subscribe((data:any) => {
 this.isLoading = false;
 this.thirdCategoriesData=data;
 });
 }

 ngOnInit():void {
 this.categoryService.getCategoriesTop().subscribe(
 (data:any)=>{
 this.topCategoriesData = data;
 });
 }

}