Angular conditional readonly/disable on input fields

Question

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.

HTML

<table>
<thead>
    <th> Name </th>
    <th> Age </th>
    <th> Url </th>
    <th> Gender </th>
    <th> Image </th>
    <th> Keywords </th>
</thead>
<tbody>
    <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>
        <td> <input class="form-control" type="text" id="userListKeywords" [(ngModel)]="userList[$index].keywords"
            name="userListKeywords{{$index}}" readonly/></td>
      </tr>
     </tbody>

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

Component:

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

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

 userList: userModel[] = [];

jsonUser = [
{
name: 'abc',
age: 17,
url: "a.com",
gender: "F",
image: "i-ocion.png",
keywords: "blah"
}, 
{
name: 'cde',
age: 18,
url: "cde.com",
gender: "F",
image: "i-oddcion.png",
keywords: "blahhh"
}, 
{
name: 'efg',
age: 19,
url: "efg.com",
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;
}

Demo

Solution

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..

<tbody>
<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>
</tr>
</tbody>

Comments

[User123]

I believe if I add two or more empty rows in the table, this condition will not work.

[User123]

I can make the input non-editable. my question is how to make few inputs editable when they are in a loop.

[User123]

I'm looking for a UI approach. I receive jsonUser object from backend, I cannot make changes to API

[Vivek Kumar]

by default in the start you can initilize your jsonUser item true and later on you keep on updating the readonly propery as you like

[Vivek Kumar]

after receiving the response, modify the it userJson.forEach(item => item.readonly = false); And keep updating the userJson depending on the business logic

[User123]

Like I mentioned, I don't want any changes to the array. I receive the JSON from backend, I cannot change API. I'm looking for UI approach

[User123]

In this case, when new row is added, item.readonly will apply as false to new row, since it is in *ngFor.

[Vivek Kumar]

When are pushing new entry into userJson at the time of creating change this property to true

[User123]

doesn't it change the previous rows as well. Can you please fork the stack blitz code and update accordingly?

[Touqeer Aslam]

do you know then which index will be disabled how you gonna checkout that which input should be disabled and which enabled

[User123]

Please check the accepted answer. That's how I resolved my issue.