Angular 2 get input element value

Question

how to get html element value using ionic 2

Below my html code

 <div class="messagesholder" *ngFor="let chat of chatval | orderby:'[date]'" >
   <div *ngIf="chat.sender == currentuser || chat.receiver == currentuser">
    <div  *ngIf="chat.date" style="text-align: center;" >
           <p style="font-size:9px;" id="amount" #amount>{{chat.date | amDateFormat:'LL'}}</p>
           <input #myname [ngModel]="range" (ngModelChange)="saverange($event)"/>
         <input #myname type="text" value={{chat.date}}>
    </div>
   </div>
   <div class="message" *ngIf="chat.sender == currentuser || chat.receiver == currentuser" [ngClass]="{'me': currentuser == chat.sender}">
          <div class='image' *ngIf="chat.path" >
            <img *ngIf="chat.path" [src]="chat.path"/><br>
            <span *ngIf="chat.path_text">{{chat.path_text}}</span>
            <span style="font-size:9px;">{{chat.date | amDateFormat:'hh:mmA'}}</span>
          </div> 
           <div *ngIf="chat.message_text">
           <span>{{chat.message_text}}</span>
           <span style="font-size:9px;">{{chat.date | amDateFormat:'hh:mmA'}}</span>
           </div>
    </div>

Below my ts file

import { Component,Inject,ViewChild,ElementRef,AfterViewInit} from '@angular/core';

export class ChatPage implements AfterViewInit {
  @ViewChild('myname') input:ElementRef; 
  constructor(public modalCtrl: ModalController,public navCtrl: NavController) {}
   ngAfterViewInit() {
    console.log(this.input.nativeElement.value);
    }
  }

The same date values ​​are repeated. I want the same date values ​​not to be repeated.

Because I will check two variables.

so i need the value of chat.date. Because I have bound the input value. But I can not get the value of the input element.

I get this error

Unable to read property "nativeElement" from undefined

How to fix this problem. Or any other way to find abbreviations.

thanks

Answer 1

I created a plnkr link: https://plnkr.co/edit/49TEP8lB4lNJEKsy3IDq?p=preview

, , , plnkr, ppl

export class ApiDemoApp{
  root = ApiDemoPage;
  @ViewChild('myname') input:ElementRef; 
  constructor() {
  }
  ngAfterViewInit() {
  console.log(this.input.nativeElement.value);
  }
}

Answer 2

@ViewChild('myname') input:any; 

ngAfterViewInit() {
 console.log(this.input.nativeElement.value) ;      
}

Answer 3

input *ngIf.

<div *ngIf="chat.sender == currentuser || chat.receiver == currentuser">
    <div  *ngIf="chat.date" style="text-align: center;" >

           <input #myname [ngModel]="range" (ngModelChange)="saverange($event)"/>
         <input #myname type="text" value={{chat.date}}>
    </div>

ngIf DOM. false, html- div DOM. ViewChild undefined. , . :

ngAfterContentInit() {
    console.log(this.input.nativeElement.value);
    }

Answer 4

ngModel.

, ngModal. .

import { Component,Inject,ViewChild,ElementRef,AfterViewInit} from '@angular/core';

export class ChatPage implements AfterViewInit {
  myname: string;
  constructor(public modalCtrl: ModalController,public navCtrl: NavController) {}
   ngAfterViewInit() {
    console.log(this.myname);
    }
  }

<input [(ngModel)]="myname" type="hidden" value="John Doe">

Hide result

Answer 5

If someone is interested in how to check if there is empty data in nativeElement, use the property textContent.

Suppose we have the following HTML output from nativeElement.outerHTML:

<div _ngcontent-c8="" checkifelementempty="" class="some-class">
  <div _ngcontent-c8="">
     <b><i>&nbsp;a</i></b>
  </div>
</div>

To check if HTML has empty text, use this: !nativeElement.textContent.trim()