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Bind input to only one text input in angular

There is a scenario where I use ngfor and adding the text box for each iteration. When I type anything in the text box it binds to every text box but I want to give input to that text box only which I click to enter a value.
<div class="comment" *ngFor="let comment of blog.comments">
<p>posts...</p>
<input type="text" [(ngModel)]="newComment.content" [ngModelOptions]="{standalone: true}">
</div>

You are referring same ngModel to every text box.
You need to have a array of newComment Objects.
<div class="comment" *ngFor="let comment of blog.comments;let i = index">
<p>posts...</p>
<input type="text" [(ngModel)]="newComment[i].content" [ngModelOptions]="{standalone: true}">
</div>

This should be like this: event -> target-> value will give you current input value
Html:
<input (keyup)="onKey($event)">
Component TS
onKey(event: any) {
console.log(event.target.value)
}

ngModel is reflecting to all textareas

I have multiple textareas (looping with ngFor and adding new divs with textareas inside). What i need is for every textarea to have separate ngModel and i don't want to directly bind this to property from object in dataArray - for example:
[(ngModel)]='data.note' or [(ngModel)]='data.feedback' .
This works but I don't have feedback property in dataArray so it won't for work for second textarea.
For example with my current implementation change in one textarea is reflecting in all other textareas. I tried with index approach but getting error:
ERROR TypeError: Cannot read property '1' of undefined
<div *ngFor="let data of dataArray; let index=index;trackBy:trackByIndex;">
<div class="card-body">
<form class="form">
<div class="form-body">
<div class="row">
<div class="col-md-6">
<div class="form-group">
<textarea name="note" [(ngModel)]='selectedNote' class="form-control"
rows="2"></textarea>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div class="form-group">
<textarea name="feedback" [(ngModel)]='selectedFeedback' class="form-control" rows="4"></textarea>
</div>
</div>
</div>
</div>
</form>
</div>
With current code if i add some text in first textarea with name 'note' that change is reflected for all textareas with name 'note'. As mentioned tried with adding
[(ngModel)]='selectedFeedback[index]' but i am getting error.
Also tried with giving different names to textareas:
<textarea name="note{{index}}" [(ngModel)]='dataArray[index]' rows="2"></textarea> OR
<textarea name="note{{index}}" [(ngModel)]='selectedNote' rows="2"></textarea>
but change is reflecting for each textarea again.

You can try it with any array, I am using data(n) function to return an Array of length n. In this example it's just for iteration
<div *ngFor="let item of data(8); let i = index">
<textarea [(ngModel)]='values[i]'></textarea>
</div>
// To reflect changes
<div *ngFor="let item of data(8); let i = index">
<div>{{ values[i] }}</div>
</div>
With TS
export class AppComponent {
values = [];
data(n) {
return Array(n);
}
}
Working example in Stackblitz.com

ngModel binds with the name property. So if you want to use multiple textarea try using different name attribute. You can iterate over like -
<ng-container *ngIf="let data of dataArray; index as i">
<textarea name="feedback_{{i}}" [(ngModel)]='selectedFeedback' class="form-control" rows="4"></textarea>
</ng-container>

How to disable a Dynamic forms in Angular2

I have created a dynamic form based on data[fields] from JSON, but I need the form to be initially disabled, so that when we click on Edit then only form becomes editable.
Here is my code for form:
<div class="col-md-8 " [ngSwitch]="fieldInfo.dataTypeName">
<input *ngSwitchCase="'Text'"
class="form-control"
[(ngModel)]="pageInfoBeans.nameValueMap[fieldInfo.name]"
name="{{fieldInfo.name}}"
[required]="fieldInfo.preRequiredInd"
[maxLength]="fieldInfo.fieldSize">
<input *ngSwitchCase="'Email Address'"
type="email"
class="form-control"
[(ngModel)]="pageInfoBeans.nameValueMap[fieldInfo.name]"
name="{{fieldInfo.name}}"
[required]="fieldInfo.preRequiredInd"
[maxLength]="fieldInfo.fieldSize">
and in my component HTML which populates from above switch case :
<app-form class="" [fieldInfo]="fieldItem.fieldInfo" [pageInfoBeans]="pageInfoBeans"></app-form>

Initially set the form to disabled.
component.ts
showForm?:boolean = false;
component.html
<button (click)="showForm = !showForm">Edit</button>
<form *ngIf="showForm">
...form markup
</form>

You need to do something like this:
<button class='form-control' (click)='isEditable = !isEditable'>Edit Mode</button>
<div class="col-md-8 " *ngIf='isEditable' [ngSwitch]="fieldInfo.dataTypeName">
<input *ngSwitchCase="'Text'"
class="form-control"
[(ngModel)]="pageInfoBeans.nameValueMap[fieldInfo.name]"
name="{{fieldInfo.name}}"
[required]="fieldInfo.preRequiredInd"
[maxLength]="fieldInfo.fieldSize" />
<input *ngSwitchCase="'Email Address'"
type="email"
class="form-control"
[(ngModel)]="pageInfoBeans.nameValueMap[fieldInfo.name]"
name="{{fieldInfo.name}}"
[required]="fieldInfo.preRequiredInd"
[maxLength]="fieldInfo.fieldSize" />
</div>

[disabled]="!isEditable" where initialize isEditable = 'disabled' this could be added in both the text and email input fields.
Also in your edit button you can add a callback for click where you can set isEditable = ''.

#Directive({
selector : ["canbedisabled"]
})
export class Canbedisabled{
constructor(private el: ElementRef) {
}
#Input()
set blocked(blocked : boolean){
this.el.nativeElement.disabled = blocked;
}
}
<input formControlName="first" canbedisabled [blocked]="isDisabled">
You can solve it with a Directive. A directive named Canbedisabled and a property "blocked", for example. Write a setter for blocked and set it to nativelement.disabled property.
refer: https://github.com/angular/angular/issues/11271

is there any way to bind ng-model to multiple input fields uniquely inside a directive?

In my Project i Got a Issue like.I need to bind the user hobbies in the text field.if the user comes with a single hobby he can directly enter the hobby that he has. but when he had multiple then he had to click add multiple hobbies button.that working fine when i am displaying input fields dynamically using directives.but the issue is the value that coming from ng-model for that input field is binding to all input fields.
Here is my code.
Thanks in advance!
these are the images
this is how i am getting
this is what i need
In HTML
<div>
<div id="showHobbyfield"></div>
<input type="number" class="form-control" placeholder="ADD HOBBIES"
ng-click="addHoby()">
</div>
In controller
$scope.addHoby= function(){
var compiledeHTML = $compile("<div my-hobby></div>")($scope);
$("#showHobbyfield").append(compiledeHTML);
};
$scope.addUser = function(){
$scope.Users= [];
var obj = {
userhobby : $scope.user.morehobies
};
$scope.Users.push(obj);
menuStorage.put($scope.Users);
//menustorage is service to store user in localStorage.
In directive
'use strict';
angular.module('myApp')
.directive('myHobby', function() {
return {
scope : false,
templateUrl: 'views/my-hobby.html'
};
});
this is template: my-hobby.html
<div class="input-group">
<input type="text" ng-model="user.morehobies" class="form-control" placeceholder="type your hobbies here">
<div class="close-icon">
<span class="glyphicon glyphicon-remove" style="padding-left: 6px;"> </span>
</div>
</div>

For this i would suggest some other way if its ok with you.
If your hobbies is coming in array, like
user.morehobies = ['Reading', 'Writing']
or create array for storing hobbies.
then inside directive you can pass that object in directive.
I will use ng-repeat inside directive.
<div class="input-group" ng-repeat="h in hobies">
<input type="text" ng-model="h" class="form-control" placeceholder="type your hobbies here">
<div class="close-icon">
<span class="glyphicon glyphicon-remove" style="padding-left: 6px;"> </span>
</div>
</div>
so whenever user clicks on "Add hobbies" then we can add empty string in hobbies object in directive.
and whenever user clicks on remove you can remove that item from array.

Validate a form field with a dynamically given name in angular

I create a form dynamically in the view by iterating through an object that has the different questions to be asked to the user. One of the attributes of every question is formFieldName which is a a random string I use to give each form field a different name.
<form name="includedForm.newRequestForm" class="form-horizontal" role="form" novalidate>
<div ng-if="message.question.attributes.structure.type == 'object'">
<div ng-repeat="(index,objField) in message.question.attributes.structure.properties">
<div ng-if="objField.type == 'array'" class="form-group" show-errors>
<label for="{{objField.formFieldName}}" class="control-label col-sm-6">{{objField.title}}
<br /><i><small>{{objField.description}}</small></i></label>
<div class="col-sm-6">
<select class="form-control" name="{{objField.formFieldName}}" multiple ng-model="objField.userValue" ng-required="objField.required">
<option ng-repeat="option in objField.items.enum" value="{{option}}">{{option}}</option>
</select>
</div>
</div>
<div ng-if="objField.type == 'boolean'" class="form-group" show-errors>
<label for="{{objField.formFieldName}}" class="control-label col-sm-6">{{objField.title}}</label>
<div class="col-sm-6">
<input class="form-control" name="{{objField.formFieldName}}" ng-model="objField.userValue" type="checkbox" ng-value="option" ng-checked="message.question.attributes" />
</div>
</div>
</div>
</div>
<div class="col-sm-12">
<button ng-click="markAsDone(message)" class="btn btn-primary">Done</button>
</div>
<form>
In the controller I'm able to get the formFieldName attribute but I can't figure out how to use it to do the validation.
var MarkAsDone = function(message) {
$scope.includedForm = {};
var formField = message.question.attributes.formFieldName;
if ($scope.includedForm.newRequestForm.{{formField}}.$valid){
//submit the form
}
}

to answer you question:
first, {{}} is === $scope so you don't use that anywhere other than HTML. You use $scope in your JS and {{}} in HTML which creates a pipe (2-way binding) so that $scope.variable.property has bidirectional binding to {{variable.property }} in HTML.
$scope.includeForm.email === {{ includeForm.email }} === ng-model="includeForm.email" === ng-bind="includeForm.email"
if you set anyone of those all are set so if you set $scope it will show up in HTML and obviously as user input gets captured it is already in $scope ... all connected
when attempting to get the value from HTML back into JS you would need create and set a $scope i.e so if you create $scope.dataModel.dataProperty and use that in ng-model=dataModel.dataProperty (example) you again have two way binding ... you don't need to do anything as angular is taking care of the data pipeline. So if you want to extract the value to var, which is probably a waste as the $scope is already set as soon as the user checks the box
var formField = $scope.dataModel.dataProperty;
// but like I said no need as $scope.dataModel.dataProperty; is your var
In JS if you want to use a dynamic property as an object property key you would place the dynamic value in [] e.g.
$scope.variable[dynamicProperty].method;
// you can set a static property as a key with dot notation i.e.
$scope.variable.staticProperty = val;
Hope that helps