我必须在本地实现搜索功能，这里更新了您的代码。请这样做。

这是我必须更新的代码。

目录结构

app/
   _pipe/
        search/
          search.pipe.ts
          search.pipe.spec.ts
app/ 
   app.component.css
   app.component.html
   app.component.ts
   app.module.ts
   app.component.spec.ts

命令运行以创建管道

ng g pipe search

组件.html

<input type="text" class="form-control" placeholder="Search" [(ngModel)]="query" id="listSearch">
    <div class="panel panel-default col-xs-12 col-sm-11" *ngFor="let lock of locked | LockFilter: query">
    <input type="checkbox" (change)="openModal($event, lock)" class="check" id="{{lock.ID}}">
    <label [for]="lock.ID" class="check-label"></label>
    <h3 class="card-text name">{{lock.User}}</h3>
    <h3 class="card-text auth">{{lock.AuthID}}</h3>
    <h3 class="card-text form">{{lock.FormName}}</h3>
    <h3 class="card-text win">{{lock.WinHandle}}</h3>
</div>

组件.js

注意：在这个文件中，我必须使用虚拟记录来实现和测试目的。

import { Component, OnInit } from '@angular/core';
import { FormsModule }   from '@angular/forms';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
    export class AppComponent implements OnInit{
    public search:any = '';
    locked: any[] = [];

    constructor(){}

    ngOnInit(){
        this.locked = [
            {ID: 1, User: 'Agustin', AuthID: '68114', FormName: 'Fellman', WinHandle: 'Oak Way'},
            {ID: 2, User: 'Alden', AuthID: '98101', FormName: 'Raccoon Run', WinHandle: 'Newsome'},
            {ID: 3, User: 'Ramon', AuthID: '28586', FormName: 'Yorkshire Circle', WinHandle: 'Dennis'},
            {ID: 4, User: 'Elbert', AuthID: '91775', FormName: 'Lee', WinHandle: 'Middleville Road'},
        ]
    }
}

module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule }   from '@angular/forms';
import { AppComponent } from './app.component';
import { SearchPipe } from './_pipe/search/search.pipe';


@NgModule({
  declarations: [
    AppComponent,
    SearchPipe
  ],
  imports: [
    BrowserModule,
    FormsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

管道.ts

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

@Pipe({
    name: 'LockFilter'
})

export class SearchPipe implements PipeTransform {
    transform(value: any, args?: any): any {

        if(!value)return null;
        if(!args)return value;

        args = args.toLowerCase();

        return value.filter(function(item){
            return JSON.stringify(item).toLowerCase().includes(args);
        });
    }
}

我希望您获得管道功能，这将对您有所帮助。

用于 Angular 的简单 filterPipe 2+

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

@Pipe({
  name: 'filter'
})
export class filterPipe implements PipeTransform {

  transform(items: any[], field:string, value: string): any[] {

    if(!items) return [];
    if(!value) return items;


    return items.filter( str => {
          return str[field].toLowerCase().includes(value.toLowerCase());
        });
   }
}

这是 HTML

<input type="text" class="form-control" placeholder="Search" id="listSearch" #search>
    <div class="panel panel-default col-xs-12 col-sm-11" *ngFor="let lock of locked | filter:'propName': search.value>
    <input type="checkbox" (change)="openModal($event, lock)" class="check" id="{{lock.ID}}">
    <label [for]="lock.ID" class="check-label"></label>
    <h3 class="card-text name">{{lock.User}}</h3>
    <h3 class="card-text auth">{{lock.AuthID}}</h3>
    <h3 class="card-text form">{{lock.FormName}}</h3>
    <h3 class="card-text win">{{lock.WinHandle}}</h3>
</div>

在 HTML PropName 中是虚拟文本。代替PropName使用您的任何对象属性键。

按照此代码使用自定义过滤器过滤特定列而不是表中的所有列

文件名.component.html

<table class="table table-striped">
  <thead>
    <tr>
      <th scope="col">product name </th>
      <th scope="col">product price</th>
   </tr>
  </thead>

  <tbody>
    <tr *ngFor="let respObj of data | filter:searchText">
      <td>{{respObj.product_name}}</td>
      <td>{{respObj.product_price}}</td>
    </tr>
 </tbody>
</table>

文件名.component.ts

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';


@Component({
  selector: 'app-productlist',
  templateUrl: './productlist.component.html',
  styleUrls: ['./productlist.component.css']
})

export class ProductlistComponent implements OnInit  {

  searchText: string;

  constructor(private http: HttpClient) { }
  data: any;
  ngOnInit() {
    this.http.get(url)
      .subscribe(
        resp => {
         this.data = resp;

        }
      )
  }
}

filename.pipe.ts
创建一个类并使用PipeTransform实现它，这样我们就可以使用转换方法编写自定义过滤器。

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
  name: 'filter'
})
export class PipeList implements PipeTransform {
  transform(value: any, args?: any): any {
    if(!args)
     return value;
    return value.filter(
      item => item.product_name.toLowerCase().indexOf(args.toLowerCase()) > -1
   );
  }
}

这是创建自定义管道的简单解释。因为可用管道不支持它。我在这里找到了这个解决方案..很好地解释了它

创建管道文件 advanced-filter.pipe

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

@Pipe({
  name: 'advancedFilters'
})

export class AdvancedFilterPipe implements PipeTransform {

  transform(array: any[], ...args): any {
    if (array == null) {
      return null;
    }

    return array.filter(function(obj) {
      if (args[1]) {
        return obj.status === args[0];
      }
      return array;
    });

  }

}

在这里，数组 – 将是传递给您的自定义管道对象的数据数组 – 将是数据的对象，您可以使用该对象添加条件来过滤数据

我们添加了条件，obj.status === args[0]以便数据可以过滤在 .html 文件中传递的状态

现在，在组件的 module.ts 文件中导入并声明自定义管道：

import {AdvancedFilterPipe} from './basic-filter.pipe';

//Declare pipe

@NgModule({

    imports: [DataTableModule, HttpModule, CommonModule, FormsModule, ChartModule, RouterModule],

    declarations: [ DashboardComponent, AdvancedFilterPipe],

    exports: [ DashboardComponent ],

    providers: [{provide: HighchartsStatic}]

})

在 .html 文件中使用创建的自定义角管

<table class="table table-bordered" [mfData]="data | advancedFilters: status" #mf="mfDataTable" [mfRowsOnPage]="rowsOnPage" [(mfSortBy)]="sortBy" [(mfSortOrder)]="sortOrder">

                <thead>
                       <tr>
                             <th class="sortable-column" width="12%">
                                 <mfDefaultSorter by="inquiry_originator">Origin</mfDefaultSorter>
                             </th>
                        </tr>
                </thead>

                <tbody class="dashboard-grid">

                                <ng-container *ngFor="let item of mf.data; let counter = index;">

                                                <tr class="data-row {{ item.status }} grid-panel-class-{{ counter }}">                                      

                                                                <td class="align-center">{{ item.trn_date }}</td>

                                                                <td>{{ item.trn_ref }}</td>

                                                </tr>

                </tbody>

</table>


//If you are using *ngFor and want to use custom angular pipe then below is code

<li *ngFor="let num of (numbers | advancedFilters: status">
  {{ num | ordinal }}
</li>

我能想到的一个简单的类 Java 逻辑在typescript方面可能看起来不太紧凑，如下所示：

transform(value:IBook[], keyword:string) {       
        if(!keyword)
        return value;
        let filteredValues:any=[];      
        for(let i=0;i<value.length;i++){
            if(value[i].name.toLowerCase().includes(keyword.toLowerCase())){
                filteredValues.push(value[i]);
            }
        }
        return filteredValues;
    }

<h2>Available Books</h2>
<input type="text" [(ngModel)]="bookName"/>
<ul class="books">
  <li *ngFor="let book of books | search:bookName"
    [class.selected]="book === selectedBook"
    (click)="onSelect(book)">
    <span class="badge">{{book.name}}</span>
  </li>
</ul>