Angular2/4 search suggestion

Question

I'm develop a drop down suggestion search box in angular 2/4. When typing on text box and press search button the searched details are displayed.But Here i want to show the searching, ‘as-you-type’ suggestion want to displayed(Like a dropdown search) .I saw so many techniques in different place but its not working. Here i install angular material I got some error in my node modules

i want like this

here I will try the pipe but its not working..Can any one please help me..

my html is

    <div class="form-group">
         <div class="input-group">
               <div [innerHTML]="highlighted"></div>
             <input name="search" class="form-control" type="text" placeholder="Search"
                  (keyup)="FetchItemDetailsSearch(searchcontent)"
                  [(ngModel)]="searchcontent">                       
              <span class="input-group-btn">
                  <button class="btn btn-success ProductSearchBtn" type="button" 
                      (click)='FetchItemDetailsSearch(searchcontent)'>
                        <i class="glyphicon glyphicon-search" aria-hidden="true"></i>
                        <span style="margin-left:10px;">Search</span>
                  </button>
               </span>
          </div>                  
    </div>

component.ts

     FetchItemDetailsSearch(itemcodeordesc: string): void {

        {
            this.highlight= this.searchcontent
                ? itemcodeordesc.replace(new RegExp('(' + this.searchcontent + ')', 'ig'),
                    '<span class=highlight>$1</span>')
                : itemcodeordesc;
        }

        this.pageIndex = 1;
        this.searchflag = 1;

        if (itemcodeordesc.length > 0)
            this.searchcontent = itemcodeordesc;
        else {
            itemcodeordesc = undefined
            this.searchcontent = itemcodeordesc;
        }
        this.prevScrollPosition = 0;
        this._enqService.FetchItemDetailsSearch(this.searchcontent,this.pageIndex).subscribe(itemsData => this.itemdetails = itemsData,
            error => {
                console.error(error);
                this.statusMessage = "Problem with the service.Please try again after sometime";
            });
    }

Here i got like this(this is the problem, not showing the suggestion)

Answer 1

Material autocomplete example

intsall angular material:

npm install --save @angular/material @angular/cdk

for Animation:

npm install --save @angular/animations

Include Theme in style.css:

@import "~@angular/material/prebuilt-themes/indigo-pink.css";

app.module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations'; // angular animation module


import {MatAutocompleteModule} from '@angular/material/autocomplete';
import {MatFormFieldModule} from '@angular/material/form-field';
import {MatInputModule} from '@angular/material/input';
import { AppComponent } from './app.component';
import { HelloComponent } from './hello.component';

@NgModule({
  imports:      [ BrowserModule, FormsModule,MatFormFieldModule,MatAutocompleteModule,MatInputModule,ReactiveFormsModule,BrowserAnimationsModule ],
  declarations: [ AppComponent, HelloComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }

app.component.html:

<form class="example-form">
  <mat-form-field >
    <input type="text" placeholder="Filter Name" aria-label="Assignee" matInput [formControl]="myControl" [matAutocomplete]="auto">
    <mat-autocomplete #auto="matAutocomplete" [displayWith]="displayFn">
      <mat-option *ngFor="let option of filteredOptions | async" [value]="option">
        {{option.name}}
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>
</form>

app.component.ts:

import { Component, OnInit } from '@angular/core';
import { FormControl } from '@angular/forms';
import { Observable } from 'rxjs';
import { map, startWith } from 'rxjs/operators';

export interface User {
  name: string;
}

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  name = 'Angular 6';
  myControl = new FormControl();
  options: User[] = [
    { name: 'Mary' },
    { name: 'Masy' },
    { name: 'Maty' },
    { name: 'Mvry' },
    { name: 'Mbry' },
    { name: 'Shelley' },
    { name: 'Igor' }
  ];
  filteredOptions: Observable<User[]>;

  ngOnInit() {
    this.filteredOptions = this.myControl.valueChanges
      .pipe(
      startWith<string | User>(''),
      map(value => typeof value === 'string' ? value : value.name),
      map(name => name ? this._filter(name) : this.options.slice())
      );
  }

  displayFn(user?: User): string | undefined {
    return user ? user.name : undefined;
  }

  private _filter(name: string): User[] {
    const filterValue = name.toLowerCase();

    return this.options.filter(option => option.name.toLowerCase().indexOf(filterValue) === 0);
  }
}

Answer 2

For the dropdown implementation, you can use angular material
Use the the autocomplete component for ui

Demo template

HTML

<form class="example-form">
  <mat-form-field class="example-full-width">
    <input type="text" placeholder="search" aria-label="Number" matInput [formControl]="myControl" [matAutocomplete]="auto" (keyup)="updated()" [(ngModel)]="data">
    <mat-autocomplete #auto="matAutocomplete">
      <mat-option *ngFor="let option of options" [value]="option">
        {{option}}
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>
</form>

Now to search with in an array of string (In this example all[]), you can use this logic

Here I am using regex to match any substring of those strings in the array

Typescript

export class AppComponent  {
  myControl = new FormControl();
  options: string[] = [];
  data : any;
  constructor() {
  }

  public updated() {
    this.options = [];
    if (this.myControl.value.length > 0) {
      let all = ['John', 'Jenny', 'Jonson']
      let searchedWord = this.myControl.value
      for(let key in all) {
        let r = all[key].search(new RegExp(searchedWord, "i"));
        if (r != -1) {
          this.options.push(all[key])
        }
      }
    } else {
      this.options = []
    }
  }
}

Working example : stackblitz

Install angular material and animations

Step - 1 : Delete all node modules

Delete all the files from node modules folder

Step - 2 : Update all the packages to latest version

npm i -g npm-check-updates

ncu -u

npm install

Step - 3 : Install angular material and animation

npm install --save @angular/material @angular/cdk

npm install --save @angular/animations

Step - 4 : Import any theme as it is required to use the libarary

@import "~@angular/material/prebuilt-themes/indigo-pink.css";

Step - 4 : Modify app.modules.ts file

Imports

import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import {MatAutocompleteModule} from '@angular/material/autocomplete';
import {MatFormFieldModule} from '@angular/material/form-field';
import {MatInputModule} from '@angular/material/input';

NgModule Meta data

@NgModule({
  imports: [ BrowserModule, FormsModule,MatFormFieldModule,MatAutocompleteModule,MatInputModule,ReactiveFormsModule,BrowserAnimationsModule ]
  ...
})
export class AppModule { 
    ...
}