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ngIf an angular reactive form component value

I have a set of radio buttons. If a user selected the value "yes" I want to show an additional box on the form.
https://stackblitz.com/edit/angular-4bgahw?file=src/app/personal/personal.component.ts
HTML.component
<div formGroupName="radioButtonsGroup" class="form-group col-6 pl-0 pt-3">
<div class="form-check-inline" *ngFor="let item of personal.radioButtonsdata">
<label for="{{item.section}}" class="col-12 customradio"
><span>{{item.section}}</span>
<input [value]="item" id="{{item.section}}" type="radio" formControlName="selectedButton"/>
<span class="checkmark"></span>
</label>
</div>
<!-- <div class="col-md-8" *ngIf="selectedButton.control.item === 'yes'"> --> //my attempt to target above input value
<div class="col-md-8" >
<input type="text" formControlName="title" class="form-control" placeholder="Title">
</div>
</div>
Can anybody get this to work and show me what I am doing wrong here please?

You need to access the value of the form control:
*ngIf="form.get('radioButtonsGroup.selectedButton').value.section === 'yes'">
STACKBLITZ

Everything you write in the template is resolved against the corresponding class (or against template variables), so you have to refer to the JavaScript control like this:
*ngIf="form.controls['selectedButton'].value === 'yes'"

Call a function to set flag based on value of the radio button, (ngModelChange)="onRadiochange($event)"
Try like this:
Working Demo
.html
<input [value]="item" (ngModelChange)="onRadiochange($event)" id="{{item.section}}" type="radio" formControlName="selectedButton" />
<div class="col-md-8" *ngIf="showTitle">
<input type="text" formControlName="title" class="form-control" placeholder="Title">
</div>
.ts
onRadiochange(e) {
if(e.section == 'yes'){
this.showTitle = true
} else {
this.showTitle = false
}
}
It can also be done in one line like this:
<input [value]="item" (ngModelChange)="$event.section == 'yes' ? showTitle=true:showTitle=false" id="{{item.section}}" type="radio" formControlName="selectedButton" />

Whenever yes checkbox is selected, you have to display the title textbox.
In that case, change your code like this.
In personal.component.ts, add this variable.
yesSelected: boolean = true;
Also in ngOnInit(),
this.form.valueChanges.subscribe(val=>{
if(val.radioButtonsGroup.selectedButton.section === "yes")
this.yesSelected = true;
else
this.yesSelected = false;
});
In personal.component.html, rewrite your if condition like this.
<div class="col-md-8" *ngIf="yesSelected">
<input type="text" formControlName="title" placeholder="Title">
</div>
These changes will show the title textbox only when the yes check box is selected.

how to show red border in input field on button In angular js

Could you please tell how to show red border in the input field on a button in angularJs . Currently, the red border is displayed when the application load. Actually, I added ng-required validation on my form .but I want this only work after button click here is my code
http://plnkr.co/edit/zL0cueTJN6xqxC4LzhOd?p=preview
<div class="form-group" ng-class="{'has-error': myform[key].$invalid}">
<input type="text" name="{{key}}" class="form-control" ng-model="value.value" ng-required="value.required">
</div>

Declare a variable $scope.isSubmitClicked=false; in scope and make it true in submit()
$scope.isSubmitClicked = false;
$scope.submit = function ($event) {
$scope.isSubmitClicked = true;
};
Then
<input type="text" name="{{key}}" class="form-control" ng-model="value.value" ng-required="value.required && isSubmitClicked">

AngularJS - form validation, v 1.4.8

This is my first time using AngularJS, and the form validation is making me question my sanity. You would think this would be the easy part, but no matter how many ways I've tried Googling, the only thing that works is if I set a flag inside my controller's submit if the form is invalid to set the error class. I've looked at similar problems here, but none of them helped, so please do not simply dismiss this as a potential duplicate. Everything else has been a fail.
In the example mark up below I have reduced my form down to just one element. Here is what I have observed:
Using only $error.required does work. The ng-class { 'has-error' :registerForm.firstName.$error.required} does outline the text box with the bootstrap has-ertror class, but this is on form load, which I do not want.
The <p> element with the error message will exhibit the same behavior, so I know that the message exists and is not malfored. It will also display if I only use $error.required. But as soon as I add && registerForm.$submitted ( or $isdirty or !notpristine ) the message will not display on form submit. There are no errors (have developers tools open in chrome) and will post to the web API with no problem and return ok 200 or 400 if I send bad params.
I can write validation code inside my controller, checking if the field has a value and setting a flag on $scope such as $scope.firstNameIsRequired and that will work fine setting ng-show="$scope.firstNameIsRequired", but that will remove testability.
So the problem definitely has to be with how I am adding this in the markup. But after a weekend spent googling I am at my wits end. The only other thing different is that I am using a span on a click element to submit the form instead of an input = submit, but the registerForm.$valid function is setting the correct value. Do I somehow need to trigger the form validation in that ng-click directive?
I am using angular.js v 1.4.8.
I do have angular ui which has it's own validate, but that shouldn't interfere with the basic validation.
Here is the simplified markup:
<form name="registerForm" class="form-group form-group-sm"
ng-controller="userAccountController" novalidate>
<div class="form-group"
ng-class="{ 'has-error' : registerForm.firstName.$error.required }">
<div><label>First Name</label> </div>
<input type="text" class="form-control" id="firstName" name="firstName" value=""
ng-model="firstName" placeholder="First Name" maxlength="100" required=""/>
<p ng-show="registerForm.firstName.$error.required && registerForm.$submitted"
class="alert alert-danger">First Name is required</p>
</div>
<div>
<span class="btn btn-default"
ng-click="submit(registerForm.$valid)">Register</span>
</div>
My controller code is
angular.module( "Application" ).controller( "userAccountController", [
"$scope", "userAccountService", function ( $scope, userAccountService)
{
$scope.hasErrors = false;
$scope.errorMessages = "";
$scope.emailExists = true;
$scope.clearErrors = function (){
$scope.hasErrors = false;
}
$scope.onSuccess = function ( response ) {
alert( "succeeded" );
}
$scope.submit = function (isValid) {
if ($scope.registerForm.$invalid)
return;
alert("isvalid");
$scope.clearErrors();
var userProfile = $scope.createUser();
userAccountService.registerUser(userProfile, $scope.onSuccess, $scope.onError);
}
$scope.createUser = function () {
return {
FirstName: $scope.firstName, LastName: $scope.lastName, Email: $scope.email,
Password: $scope.password, SendAlerts: $scope.sendAlerts
};
};
}
]);
Any help will be appreciated. I probably just need a second set of eyes here because I have been dealing with this on and off since late Friday.

in angular you want use the element.$valid to check wheter an model is valid or not - and you use element.$error.{type} to check for a specific validation error.
Keep in mind that the form.$submitted will only be set if the form is actually submitted - and if it has validationerrors it will not be submitted (and thus that flag is still false)
If you want to show errors only on submit you could use a button with type="submit" and bind to ng-click event - and use that to set a flag that the form has been validated. And handling the submit if the form is valid.
A short example with 2 textboxes, having required and minlength validation:
angular.module("myApp", [])
.controller("myFormController", function($scope) {
$scope.isValidated = false;
$scope.submit = function(myForm) {
$scope.isValidated = true;
if(myForm.$valid) {
console.log("SUCCESS!!");
}
};
});
.form-group {
margin: 10px;
padding: 10px;
}
.form-group.has-error {
border: 1px solid red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.js"></script>
<div ng-app="myApp" ng-controller="myFormController">
<form name="myForm">
<div class="form-group" ng-class="{'has-error': myForm.name.$invalid && isValidated}">
<span>Name:</span>
<input type="text" name="name" minlength="5" ng-model="name" required />
<span ng-if="myForm.name.$error.required && isValidated">Name is required</span>
<span ng-if="myForm.name.$error.minlength && isValidated">Length must be atleast 5 characters</span>
</div>
<div class="form-group" ng-class="{'has-error': myForm.email.$invalid && isValidated}">
<span>Email:</span>
<input type="text" name="email" minlength="5" ng-model="email" required />
<span ng-if="myForm.email.$error.required && isValidated">Email is required</span>
<span ng-if="myForm.email.$error.minlength && isValidated">Length must be atleast 5 characters</span>
</div>
<button type="submit" ng-click="submit(myForm)">Submit</button>
</form>
</div>

Do not trigger form.$invalid on first load

Having such form
<div ng-controller="FormController as f_ctrl">
<form ng-submit="f_ctrl.submit()" name="myForm">
<input type="text" ng-model="f_ctrl.user.username"
required
ng-minlength="4"/>
<input type="text" ng-model="f_ctrl.user.password"/>
<input type="submit" value="Submit" ng-disabled="myForm.$invalid">
</form>
</div>
and such controller
.controller('FormController', [function() {
var self = this;
self.submit = function() {
console.log('User submitted form with ' + self.user.username)
}
}]);
I have a problem: when page first loads it immediately shows red border on username field, even before I start typing anything.
I need to highlight invalid fields only after first submission. Can this be done using form.$invalid ?

You have to use $pristine for that. It is true when form controller is not changed. so when you change textbox data its comes false.
Small example for you.
<div class="form-group" ng-class="{ 'has-error' : userForm.password.$invalid && !userForm.password.$pristine }">
<input id="passAnime" type="password" name="password" ng-model="user.password" class="form-control input-md" placeholder="Password" tabindex="5" ng-maxlength="25" ng-minlength="6" required>
<span ng-show="userForm.password.$dirty && userForm.password.$invalid">
<p ng-show="userForm.password.$error.required" class="error-messages">
Your password is required.
</p>
<p ng-show="userForm.password.$error.minlength" class="error-messages">
Your password is too short. Minimum 6 chars.
</p>
<p ng-show="userForm.password.$error.maxlength" class="error-messages">
Your password is too long. Maximum 25 chars.
</p>
</span>
</div>

Angular has helpers that tell you if the form (or form field) is $dirty (user has typed something) or if the form is $touched (the blur event has been triggered on the input). See this demo.
I need to highlight invalid fields only after first submission.
Unfortunately, Angular doesn't support that. But you could implement it yourself rather easily:
Controller
function FormController() {
var vm = this;
vm.submitAttempted = false;
vm.submit = function(isValid) {
if (isValid) {
// do stuff
}
else {
vm.submitAttempted = true;
}
};
}
HTML
<div ng-app='app'>
<div ng-controller='FormController as vm'>
<form name='fooForm' ng-submit='vm.submit(fooForm.$valid)' novalidate>
<label>Username</label>
<input
name='username'
type='text'
ng-model='vm.user.username'
required
ng-minlength='4'
ng-class="{'invalid': vm.submitAttempted && fooForm.username.$invalid}">
<br /><br />
<button type='submit'>Submit</button>
</form>
</div>
</div>
CSS
.invalid {
border-color: red;
}
Demo
I have a problem: when page first loads it immediately shows red border on username field, even before I start typing anything.
That's probably because you have the following CSS class:
.ng-invalid {
border-color: red;
}
Angular will always apply the ng-invalid class to fields that are invalid, and there's nothing you could do about that. So if you don't always want invalid fields to have a red border, you can't use that class and you should do it in a way similar to what I proposed above.
Also, check out ngMessages.

You can disable the default styling on the input field that is adding the red border by default, by adding the following CSS:
input:required {
-moz-box-shadow: none;
box-shadow: none;
}
Then if you want to highlight the field when the form is submitted, you will need to ensure that the form and form fields have relevant name attributes. Doing this will allow you to check if the field is valid or not and apply a class to your text field when it is invalid:
<input type="text" name="username" ng-class="{ 'invalid-field' : f_ctrl.myForm.username.$invalid && !f_ctrl.myForm.username.$pristine }" required />
f_ctrl.myForm and f_ctrl.myform.username will have additional properties that you can use/check to determine if the form or fields are invalid or not, or if they have been modified at any point (e.g. f_ctrl.myform.username.$dirty). You should be able to view these properties on your page by adding the follow HTML:
<div>
<pre>{{f_ctrl.myForm | json}}</pre>
</div>
Or, you could output self.myForm to the console from your controller to view it's properties
console.log(self.myForm);

jQuery | Set focus to input (fixed focus)

I want my input always has value so that focus is fixed to it until the values are typed and the cursor also can't escape the input.
I know the focus() function is existed but how can i deal with it? It is just an event isn't it? Is there any solution?
This is the html code which include the input.
<div class="col-xs-3 vcenter from-group" id="info">
<div class="form-group">
<label class="control-label" for="inputID">아이디</label><p style="display:inline; padding-left:60px; color:red; font-size: 12px">* 적어도 하나의 대문자, 소문자, 숫자를 포함한 6자~16자</p>
<div class="controls">
<input type="text" class="form-control" name="inputID" id="inputID" placeholder="내용을 입력해 주세요" required autofocus>
</div>
</div>
This is the script where the input is bound the events.
<script>
jQuery('#inputID').keyup(blank_special_char_validation);
jQuery('#inputID').focusout(function(){
if (!$(this).val()) {
var message = "no id";
error(this.id, message); // ** TODO : SET FOCUS HERE !!
} else {
id_form_validation(this.id);
}
});
Could you guys see the **TODO in code above? I want to add function that the focus is fixed until the value is written.
Please could guys give me some idea. Thank you.
=========================================================================
I want to focus my input depends on situation. For example, I want to focus it when the value isn't existed or the validation doesn't correct. However it has to focus out when the value is existed or the validation is true.
I can set focus it finally but how can i unfocus it? I mean i want to untrigger the focus event.
jQuery('#inputID').on('blur',function(){
if (!$(this).val()) {
var message = "아이디를 입력해 주세요";
error(this.id, message);
$(this).focus();
} else {
//$(this).focus();
if (!id_form_validation(this.id)) {
$(this).focus(); // TODO : FOCUS
}else {
$(this).off('focus'); // TODO : FOCUS OUT
$(this).off('blur');
}
}
});

You can use this code to do the same... I have used blur
//jQuery('#inputID').keyup(blank_special_char_validation);
jQuery('#inputID').focusout(function() {
if (!$(this).val()) {
$(this).focus();
var message = "no id";
error(this.id, message);
}else {
id_form_validation(this.id);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="col-xs-3 vcenter from-group" id="info">
<div class="form-group">
<label class="control-label" for="inputID">아이디</label><p style="display:inline; padding-left:60px; color:red; font-size: 12px">* 적어도 하나의 대문자, 소문자, 숫자를 포함한 6자~16자</p>
<div class="controls">
<input type="text" class="form-control" name="inputID" id="inputID" placeholder="내용을 입력해 주세요" required autofocus>
</div>
</div>

Use $(this).focus() to focus your input.
focus() with no arguments will trigger that event on an element.