Angular conditional readonly/disable on input fields Code Answer

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I have a table with input fields which I am populating with model values, I want to apply readonly/disable to these populated fields. when I click on add row, I add empty rows to the table. The empty rows added to the table must be editable. I am unable to find a logic which applies readOnly/disable only to already populated table cells.


    <th> Name </th>
    <th> Age </th>
    <th> Url </th>
    <th> Gender </th>
    <th> Image </th>
    <th> Keywords </th>
    <tr *ngFor="let data of userList; let $index = index">
        <td> <input class="form-control" type="text" id="userListName"[(ngModel)]="userList[$index].name"
            name="userListName{{$index}}" [readonly]="userList[$index].name.length"/></td>
        <td> <input class="form-control" type="text" id="userListAge" [(ngModel)]="userList[$index].age"
            name="userListAge{{$index}}" readonly/></td>
        <td><input class="form-control" type="text" id="userListUrl" [(ngModel)]="userList[$index].url" name="userListUrl{{$index}}" readonly/></td>
        <td> <input class="form-control" type="text" id="userListGender" [(ngModel)]="userList[$index].gender"
            name="userListGender{{$index}}" readonly/></td>

        <td> <input class="form-control" type="text" id="userListImage" [(ngModel)]="userList[$index].image"
            name="userListImage{{$index}}"  readonly/>
        <td> <input class="form-control" type="text" id="userListKeywords" [(ngModel)]="userList[$index].keywords"
            name="userListKeywords{{$index}}" readonly/></td>

 <button (click) ="addRow()"> Add Row </button>


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

 selector: 'my-app',
 templateUrl: './app.component.html',
 styleUrls: ['./app.component.css']
 export class AppComponent {

 userList: userModel[] = [];

jsonUser = [
name: 'abc',
age: 17,
url: "",
gender: "F",
image: "i-ocion.png",
keywords: "blah"
name: 'cde',
age: 18,
url: "",
gender: "F",
image: "i-oddcion.png",
keywords: "blahhh"
name: 'efg',
age: 19,
url: "",
gender: "F",
image: "i-ocfffion.png",
keywords: "blahhhhhhh"
ngOnInit() {
this.userList = this.jsonUser;

addRow() {
this.userList.push(new userModel);

export class userModel {
name: string;
age: number;
url: any;
gender: string;
image: string;
keywords: string;



You could declare a variable that identifies the size of the array that comes from backend (like initialArraySize), then when you add a new row you verify if the index of that row is greater than the initial array size, if its true, you make it editable..

<tr *ngFor="let data of userList; let index = index">
    <td> <input class="form-control" type="text" id="userListName" [(ngModel)]="userList[index].name"
        name="userListName{{index}}" [readonly]="index >== initialArraySize"/></td>
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