Develop Reference

How to validate mandatory fields in the front-end and back-end

I am creating my form and I need to make some validations of some fields that are mandatory both in the front and in the back and that are not allowed to send until duly filled out.
The following is the form with the fields.
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<form>
<div id="informacionTicket" class="user">
<div class="card shadow mb-4">
<div class="card-header py-3">
<h4 class="m-0 font-weight-bold text-primary">
Applicant</h4>
</div>
<div class="card-body">
<div class="mb-4">
<div class="form-group">
<label for="ticketIdAppliInput">Id:</label>
<input maxlength="9" required id="ticketIdAppliInput" type="text" name="matricula" onkeypress="if (isNaN(String.fromCharCode(event.keyCode))) return false;" class="form-control form-control-user" />
</div>
<div class="form-group">
<label for="ticketNameAppliInput">Full name:</label>
<input maxlength="100" id="ticketNameAppliInput" type="text" name="nombre" class="form-control form-control-user" />
</div>
<div class="form-group">
<label for="ticketEmailAppliInput">Email:</label>
<input maxlength="100" id="ticketEmailAppliInput" type="email" name="email" class="form-control form-control-user" />
</div>
</div>
</div>
</div>
</div>
</form>
<button type="button" id="submit" class="btn btn-primary btn-user btn-block">Send</button>
The following is the JavaScript function that sends the data.
function f_submitForm() {
form.append("ticketIdAppliInput", document.getElementById("ticketIdAppliInput").value);
form.append("ticketNameAppliInput", document.getElementById("ticketNameAppliInput").value);
form.append("ticketEmailAppliInput", document.getElementById("ticketEmailAppliInput").value);
}
UPDATE:
Add minimal reproducible example, form controller
[HttpPost]
public JsonResult CreateNewTicket()
{
var ticketIdAppliInput = Request.Form["ticketIdAppliInput"];
var ticketNameAppliInput = Request.Form["ticketNameAppliInput"];
var ticketEmailAppliInput = Request.Form["ticketEmailAppliInput"];
try
{
using (var scope = new TransactionScope())
{
var ticket = new TK_HD_TICKETS
{
CUSTOMER_ID = ticketIdAppliInput,
CUSTOMER_FULLNAME = ticketNameAppliInput,
CUSTOMER_EMAIL = ticketEmailAppliInput,
};
var result = ticketCreate.CreateNewTicket(ticket);
// If the ticket was not saved, the transaction is finished and we return the error message
if (!result.Success)
return Json(new TicketResult
{
IsValid = false,
Error = "The ticket could not be created, please try again."
});
}
}catch (DbEntityValidationException ex)
{
// Failed to try to register data in the database
foreach (var e in ex.EntityValidationErrors)
foreach (var validationError in e.ValidationErrors)
Console.WriteLine("Property: " + validationError.PropertyName + " Error: " +
validationError.ErrorMessage);
return Json(new TicketResult
{
IsValid = false,
Error = "There was an error creating the ticket, please try again."
});
}
}

Create yourself a model class:
public class MyData {
[Required]
[StringLength(9)]
[Display(Name="Id")]
public string ticketIdAppliInput {get;set;}
[Required]
public string ticketNameAppliInput {get;set;}
[Required]
public string ticketEmailAppliInput {get;set;}
}
Change your controller to take this class as input:
[HttpPost]
public ActionResult CreateNewTicket(MyData data) {
if (ModelState.IsValid)
return Json(...);
return View(data);
}
Then change your view to actually use this class (I'll do the first input for you):
#model MyData
#using (Html.BeginForm())
{
<div id="informacionTicket" class="user">
<div class="card shadow mb-4">
<div class="card-header py-3">
<h4 class="m-0 font-weight-bold text-primary">
Applicant</h4>
</div>
<div class="card-body">
<div class="mb-4">
<div class="form-group">
#Html.LabelFor(model=>model.ticketIdAppliInput)
#Html.TextboxFor(model=>model.ticketIdAppliInput, new { #type="text", #class="form-control form-control-user"})
#Html.ValidationMessageFor(model=>model.ticketIdAppliInput)
</div>
<div class="form-group">
<label for="ticketNameAppliInput">Full name:</label>
<input maxlength="100" id="ticketNameAppliInput" type="text" name="nombre" class="form-control form-control-user" />
</div>
<div class="form-group">
<label for="ticketEmailAppliInput">Email:</label>
<input maxlength="100" id="ticketEmailAppliInput" type="email" name="email" class="form-control form-control-user" />
</div>
</div>
</div>
</div>
</div>
<button type="button" id="submit" class="btn btn-primary btn-user btn-block">Send</button>
}

In Html you can simple use required tag and there are lots of jquery library which will provide validation for you as well show popup custom message.

angular 4 submit form by pressing enter with login button

Is it possible to submit a form that have a submit button (by pressing enter)
I have two text fields by clicking the login button I am able to process the outcome but I am unable to do it by hitting enter.
Here is the HTML code(updated with full code)
this is signin.component.html
<div class="modal-content" style="padding: 10px;" id="login" *ngIf="show">
<div class="modal-body text-left">
<div class="login">
<h2>Login</h2>
<hr>
<div class="row socialButtons">
<div class="col-xs-12 col-sm-12 col-md-4">
<a class="btn btn-lg btn-block btn-facebook" (click)="signInFacebook()">
<i class="fa fa-facebook visible-xs"></i>
<span class="hidden-xs">Facebook</span>
</a>
</div>
<div class="col-xs-12 col-sm-12 col-md-4">
<a class="btn btn-lg btn-block btn-linked-in" (click)="signInLinkedin()">
<i class="fa fa-linkedin visible-xs"></i>
<span class="hidden-xs">Linkedin</span>
</a>
</div>
<div class="col-xs-12 col-sm-12 col-md-4">
<a class="btn btn-lg btn-block btn-google-plus" (click)="signInGoogle()">
<i class="fa fa-google-plus visible-xs"></i>
<span class="hidden-xs">Google</span>
</a>
</div>
</div>
<br>
<div class="row">
<div class="col-xs-12 col-sm-12 col-md-12">
<form class="loginForm" #loginForm="ngForm" action="" autocomplete="off" method="POST">
<div class="form-group">
<label class="control-label" for="signupName">Email</label>
<input type="email" class="form-control" name="username" placeholder="Email" [(ngModel)]="username" required>
</div>
<div class="form-group">
<label class="control-label" for="signinPassword">Password</label>
<input type="password" class="form-control" name="password" placeholder="Password" [(ngModel)]="password" required>
</div>
</form>
<div class = "error"> {{ errMsg }} </div>
<button class="btn btn-lg btn-info btn-block btnlog" type="button" [disabled]="loginForm.invalid" (click)="login()">Login</button>
<hr>
</div>
</div>
<div class="row row-sm-offset-3">
<div class="col-xs-12 col-sm-12 col-md-6">
<p class="forgotPwd">
Forgot password? Reset
</p>
<p class="forgotPwd">
New User? Register now
</p>
</div>
</div>
</div>
</div>
</div>
<div *ngIf="showSignUp">
<app-sign-up></app-sign-up>
</div>
<div *ngIf="showForgotPassword">
<app-forgot-password></app-forgot-password>
</div>
this signin.component.ts file
import { Component, OnInit } from '#angular/core';
import {NgbModal, NgbActiveModal} from '#ng-bootstrap/ng-bootstrap';
import { Router } from '#angular/router';
import { AuthService } from '../services/auth/auth.service';
#Component({
selector: 'app-sign-in',
templateUrl: './sign-in.component.html',
styleUrls: ['./sign-in.component.css']
})
export class SignInComponent implements OnInit {
username:string;
password:string;
show = true;
showSignUp = false;
showForgotPassword = false;
errMsg = "";
constructor(
private authService: AuthService,
public activeModal: NgbActiveModal,
) { }
ngOnInit() {
this.authService.getEmitter().subscribe(res => {
if(res){
this.activeModal.dismiss('success');
}
else{
this.username = "";
this.password = "";
this.errMsg = "Invalid Username/Password";
}
})
}
signInGoogle(){
this.authService.loginWithGoogle();
}
signInFacebook(){
this.authService.loginWithFacebook();
}
signInLinkedin(){
this.authService.loginWithLinkedin();
}
logOut(){
this.authService.logOut();
}
login(){
this.authService.login(this.username,this.password);
}
reset(){
this.show = false;
this.showSignUp = false;
this.showForgotPassword = true;
}
signup(){
this.show = false;
this.showSignUp = true;
this.showForgotPassword = false;
}
}

Use (keyup.enter)="focusableSubmit.click()" to input Password and call #focusableSubmit to Button login, this would perform the task and same for button as shown in code below.
<div class="row">
<div class="col-xs-12 col-sm-12 col-md-12">
<form class="loginForm" #loginForm="ngForm" action="" autocomplete="off" method="POST">
<div class="form-group">
<label class="control-label" for="signupName">Email</label>
<input type="email" class="form-control" name="username" placeholder="Email" [(ngModel)]="username" required>
</div>
<div class="form-group">
<label class="control-label" for="signinPassword">Password</label>
<input type="password" class="form-control" name="password" placeholder="Password" [(ngModel)]="password" required (keyup.enter)="focusableSubmit.click()">
</div>
</form>
<div class = "error"> {{ errMsg }} </div>
<button #focusableSubmit class="btn btn-lg btn-info btn-block btnlog" type="button" [disabled]="loginForm.invalid" (click)="login()">Login</button>
<hr>
</div>
</div>

Your button should be inside the form but you have closed it inside the two input fields.
Update your code like this
<div class="row">
<div class="col-xs-12 col-sm-12 col-md-12">
<form class="loginForm" #loginForm="ngForm" action="" (submit)="login()" autocomplete="off" method="POST">
<div class="form-group">
<label class="control-label" for="signupName">Email</label>
<input type="email" class="form-control" name="username" placeholder="Email" [(ngModel)]="username" required>
</div>
<div class="form-group">
<label class="control-label" for="signinPassword">Password</label>
<input type="password" class="form-control" name="password" placeholder="Password" [(ngModel)]="password" required>
</div>
<div class = "error"> {{ errMsg }} </div>
<button type="submit" class="btn btn-lg btn-info btn-block btnlog" [disabled]="loginForm.invalid" (click)="login()">Login</button>
</form>
<hr>
</div>
</div>

Yes you can.
Usually, you need to put your code in action="". But this isn't old HTML, this is Angular, and it works with Javascript.
So, in order to do that, you need to add the novalidate tag, and tell the form what to do when you validate it.
You also need to declare a submit input instead of your button.
This would look like
<form class="loginForm" novalidate (ngSubmit)="login()" autocomplete="off">
<input type="submit" value="Login" class="btn btn-lg btn-info btn-block btnlog" [disabled]="loginForm.invalid" (click)="login()"/>

Yes it is possible and quite easy!
First you have to replace
(button)="button()"
with
(ngSubmit)="login()"
and remove the click handler from the button and change the type to submit.
Both lines changed look like this:
<form class="loginForm" #loginForm="ngForm" action="" autocomplete="off" (ngSubmit)="login()" method="POST">
and:
<button type="submit" class="btn btn-lg btn-info btn-block btnlog" [disabled]="loginForm.invalid">Login</button
Dont forget that this way, that button() does not get called.
Angular documentation is really helpful on most of the generel topics, maybe you should take a look there.
Additionally you should consider reading up on some basic information about forms. I personally suggest: forms on MDN and buttons on MDN.

Here's a strapped version of my form for sending comments.
As you see, I prevented the ENTER event on textarea and that will cause pressing ENTER while focused on textarea to not make a new line (but you can use SHIFT + ENTER).
Pressing enter sends a form.
<form #addCommentForm="ngForm" (keydown.enter)="addComment(addCommentForm.value)">
<textarea (keydown.enter)="$event.preventDefault()" type="text" placeholder="Leave a comment..." name="description" #description="ngModel" [(ngModel)]="comment.description"></textarea>
</form>

Give a try to
<button type="submit" class="btn btn-lg btn-info btn-block btnlog" [disabled]="loginForm.invalid" (click)="login()">Login</button>

Load the values twice into two input fields onload

I am using local storage to save the username in the first-page.html and retrieving it into the second-page.html
But if I have two or more places in my second-page.html where I want the username to be retrieved, how can I achieve it using two different ids. Since the id once used cannot be used in another input field.
Can anyone please help.
Index.html:
<script>
function save(){
var fieldValue = document.getElementById('user').value;
localStorage.setItem('text', fieldValue);
}
</script>
<div class="form-group" id="login-fields">
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-user fa" aria-hidden="true"><span class="text--white glyphicon glyphicon-user"></span></i>
</span>
<input type="text" name="user" id="user" placeholder="Username" class="form-control" required/>
</div>
</div>
</div>
<input class="view sign-in-app" type="submit" value="Sign In" id="submit-login" onclick="save()" />
SecondPage.html
<script>
function load(){
var storedValue = localStorage.getItem('text');
if(storedValue){
document.getElementById('here').value = storedValue;
}
}
</script>
<body onload="load()">
<!-- first div -->
<div class="form-group">
<div class="cols-sm-10">
<div class="input-group">
<input type="text" name="userName" id="here" class="form-control" placeholder="Username" required>
</div>
</div>
</div>
<!-- second div -->
<div class="form-group">
<div class="cols-sm-10">
<div class="input-group"> // change the id here
<input type="text" name="userName" id="here" class="form-control" placeholder="Username" required>
</div>
</div>
</div>
</body>

Just give each element different ids, really. No problem with that. And then when you set, set both:
if (storedValue) {
document.getElementById('here').value = storedValue;
document.getElementById('my-other-id').value = storedValue;
}

Form validation is not working in MEAN Stack using angular js and node js

Hello I am working with MEAN Stack application.When I add record data stored
Successfully. But When I don't fill any field and click add button which is
Calling function for store record My function working properly But I used the
Validation field is required but function working and redirect my given path.
new data is not storing but why function is working.
function in controller
$scope.adduser = function()
{
$http({
method:"POST",
url:'api/adduser',
data:{name:$scope.name, email:$scope.email,password:$scope.password}
}).then(function successCallback(response) {
if(response.data.error){
$scope.error = response.data.error;
}else{
$scope.Blog=response.data;
$localStorage.dd=$scope.Blog;
$location.path('/allusers');
}
//console.log(response);
}, function errorCallback(response) {
alert("data is not comming here");
});
}
message show field is required but not stay there go to the given path when
response success. how to resolved this problem
view file is
<!-- BEGIN PAGE HEADER-->
<h3 class="page-title">
Advanced Datatables <small>advanced datatable samples</small>
</h3>
<div class="page-bar">
<ul class="page-breadcrumb">
<li>
<i class="fa fa-home"></i>
Home
<i class="fa fa-angle-right"></i>
</li>
<li>
All Users
</li>
</ul>
</div>
<div class="row">
<div class="col-md-12">
<!-- BEGIN VALIDATION STATES-->
<div class="portlet box blue-hoki">
<div class="portlet-title">
<div class="caption">
<i class="fa fa-gift"></i>
New User
</div>
</div>
<div class="portlet-body form">
<form id = "expensesCreate" class="form-horizontal">
<div class="form-body">
<div class="alert alert-danger display-hide">
<button class="close" data-close="alert"></button>
You have some form errors. Please check below.
</div>
</div>
<div class="form-group">
<label for="price" class="col-sm-3">Name</label>
<div class="col-sm-4 #if($errors->has('price')) has-error #endif">
<input class="form-control input-sm" placeholder="" autocomplete="off" id="first_name" name="name" ng-model="name" type="text" value ="" required>
<p class="error"></p>
</div>
</div>
<div class="form-group">
<label for="price" class="col-sm-3">Email</label>
<div class="col-sm-4 #if($errors->has('price')) has-error #endif">
<input class="form-control input-sm" placeholder="" autocomplete="off" id="email" name="email" ng-model="email" type="text" value ="" required>
<p class="error"></p>
</div>
</div>
<div class="form-group">
<label for="Phone_no" class="col-sm-3">Password</label>
<div class="col-sm-4 #if($errors->has('Phone_no')) has-error #endif">
<input class="form-control input-sm" placeholder="" autocomplete="off" id="phone_no" name="company_name" ng-model="password" type="text" value ="" required>
<p class="error"></p>
</div>
</div>
<div class="form-actions">
<div class="row">
<div class="col-md-offset-3 col-md-9">
<button ng-click="adduser()" class="btn blue-hoki">Add</button>
<a ng-href="#/allusers">
<button type="button" class="btn default" id="cancel">Cancel</button>
</a>
</div>
</div>
</div>
</div>
</form>
<!-- END FORM-->
</div>
</div>
<!-- END VALIDATION STATES-->
</div>
</div>
<style>
.form-horizontal .form-group {
margin-right: -15px;
margin-left: 0px;
}
</style>

Add disabled attribute on your button validation while the form is invalid
<button ng-click="adduser()" class="btn blue-hoki" ng-disabled="expensesCreate.$invalid">Add</button>

Error in submitting form using ajax

For some reason, the form is not getting submitted. I have used ajax form to save the form details in my database.
Here is the site link:
http://www.famproperties.com/mudon/Abu-Dhabi/villas.html
Here is the script code.
<script>
$(document).ready(function() {
$("#submit-form-button").click(function() { submitForm(); });
});
function submitForm() {
if ( $("#NAME").val() == '' ||
$("#EMAIL").val() == '' ||
$("#MOBILE").val() == '' ||
$("#NOTE").val() == '' )
{ alert ("All field are required");}
else {
$.ajax({
type: "POST",
url: "http://famproperties.com/real_estate/property/contact/lead/",
data: {
NAME: $("#NAME").val(),
EMAIL: $("#EMAIL").val(),
MOBILE: $("#MOBILE").val(),
NOTE: $("#NOTE").val(),
SOURCE: 'MSB.COM'
},
success: function() {
alert("Thanks, Our specialist will contact you soon.");
},
dataType: 'html'
});
$("#NAME").val('');
$("#EMAIL").val('');
$("#MOBILE").val('');
$("#NOTE").val('');
}};
</script>
Here is the form code.
<!--NEW FORM -->
<div class="form-horizontal" role="form" accept-charset="UTF-8" action="http://famproperties.com/real_estate/property/contact/lead/" autocomplete="on" id="pro-form" method="post">
<div class="form-group">
<label for="NAME" class="col-sm-2 control-label">Name</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="NAME" required="" placeholder="Name">
</div>
</div>
<div class="form-group">
<label for="EMAIL" class="col-sm-2 control-label ">Email</label>
<div class="col-sm-10">
<input type="email" class="form-control" id="EMAIL" required="" placeholder="me#example.com">
</div>
</div>
<div class="form-group">
<label for="MOBILE" class="col-sm-2 control-label">Mobile</label>
<div class="col-sm-10">
<input type="phone" class="form-control inputs" id="MOBILE" required="" placeholder="Mobile">
</div>
</div>
<div class="form-group">
<label for="NOTE" class="col-sm-2 control-label">Message</label>
<div class="col-sm-10">
<input type="text" class="form-control" id="NOTE" required="" placeholder="Note">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<a href="#" onclick="return false" class="btn btn-default btn-lg button" id="submit-form-button" style="background-color: #ffc600;
color: #2a292a;
width: 100%;"> Submit <span class="fa fa-chevron-right fa-1x"></span><span class="fa fa-chevron-right fa-1x"></span> </a>
</div>
</div>
</div>
<!--NEW FORM-->

Seeing the page on http://www.famproperties.com/mudon/Abu-Dhabi/villas.html you are not even loading jquery check the console and youll see this error:
Uncaught ReferenceError: $ is not defined
Thats why ajax is not working
Edit: Sorry, checking your code again i saw you are loading jQuery but you are trying to use jQuery before loading it. So, try moving the jquery script tag to the header or move your js below the jQuery script tag.