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Edit PDF form html and JS

enter image description here
hallo please help me...
I'm working on an electronic signature application using the API, now here I have a pdf that will be sent to the API for signature, how do I get this logo image to enter the pdf iframe when dragging?, here I use pure javascript for such draggable images and coordinate x,y..
This form acts to the controller and the contents of the controller are directly posted to the API.
if you can't?, is there an open source for editing pdf?, I'm looking for these plugins mostly paid.
and is there any suggestion to edit the pdf?
an example of the form I use with javascript
#section('content')
<form action="{{ route('surat.sign', $surat->surat_tte_id) }}" method="POST" enctype="multipart/form-data">
#csrf
<!-- ROW-1 OPEN -->
<div class="row">
<div class="col-md-12 col-lg-12">
<div class="card">
<div class="card-header">
<h3 class="mb-0 card-title"> Sign Surat Tanda Tangan Elektronik </h3>
</div>
<div class="card-body">
<div class="row">
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Nik </label>
<input type="text" class="form-control" name="nik" placeholder="" value="{{ Auth::user()->nik }}" required readonly>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Name </label>
<input type="text" class="form-control" placeholder="" value="{{ Auth::user()->name }}" readonly>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Pasphrase </label>
<input type="password" class="form-control" name="pasphrase" placeholder="Masukan Pasphrase Wajib diisi" required>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Pilih Jenis Tanda Tangan </label>
<select class="form-control select2-show-search" data-placeholder="Pilih Jenis Tanda Tangan" name="tampilan" required>
<option label="Pilih Jenis Tanda Tangan"></option>
<option value="visible"> Visible </option>
<option value="invisible"> Invisible </option>
</select>
#error('tampilan')
<div class="invalid-feedback">{{ $message }}</div>
#enderror
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> QRCode </label>
<input type="text" class="form-control" name="linkQR" placeholder="QRCode">
</div>
<span class="text-danger">*) jika menggunakan gambar visible, QRCode Boleh Tidak Diisi | Jika dipakai silakan diisi </span>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Pilih Jenis Image </label>
<select class="form-control select2-show-search" data-placeholder="Pilih Jenis Image" name="image">
<option label="Pilih Jenis Image"></option>
<option value="true"> True </option>
<option value="false"> False </option>
</select>
#error('image')
<div class="invalid-feedback">{{ $message }}</div>
#enderror
<span class="text-danger">*) jika false, linkQR harus di isi </span>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Page/Halaman </label>
<input type="text" class="form-control" placeholder="Halaman" value="" name="page" required>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Kordinat X </label>
<input type="text" class="form-control" placeholder="Jika menggunakan Visible, Kordinat Posisi Gambar automatis" value="" name="xAxis" id="resultsX" readonly>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Kordinat Y </label>
<input type="text" class="form-control" placeholder="Jika menggunakan Visible, Kordinat Posisi Gambar automatis" value="" name="yAxis" id="resultsY" readonly>
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Height Gambar </label>
<input type="text" class="form-control" placeholder="Jika menggunakan Visible, height gambar contoh 500" value="" name="yAxis" maxlength="3">
</div>
</div>
<div class="col-md-6">
<div class="form-group">
<label class="form-label"> Width Gambar </label>
<input type="text" class="form-control" placeholder="Jika menggunakan Visible, height gambar contoh 500" value="" name="yAxis" maxlength="3">
</div>
</div>
<div class="col-lg-6">
<div class="card shadow">
<div class="card-header">
<h3 class="mb-0 card-title">Image</h3>
</div>
<div id="uploader" onclick="$('#filePhoto').click()">
<img src="" id="box"/>
</div>
<input type="file" name="imageTTD" id="filePhoto" />
<span class="text-danger">*) jika menggunakan gambar visible, QRCode Boleh Tidak Diisi | Gambar jpg,jpeg,png </span>
</div>
</div>
<div class="col-md-12">
#if($surat->file == null)
<p> surat anda belum di cetak, silakan cetak di menu verifikasi</p>
#else
<input type="file" class="form-control" name="file" value="{{ $surat->file }}" style="display:none;"/>
<iframe src="{{ asset('storage/surat/'.$surat->file) }}" type="application/pdf" style="width: 100%; height: 900px; padding: 0;"></iframe>
#endif
</div>
</div>
</div>
<div class="card-footer">
<i class="fa fa-arrow-left"></i> Kembali
<button type="submit" class="btn btn-outline-success">Simpan <i class="fa fa-send"></i></button>
</div>
</div>
</div>
</div>
</form>
</div>
</div>
</div>
#endsection
#section('js')
<!-- SELECT2 JS -->
<script src="{{ URL::asset('assets/plugins/select2/select2.full.min.js') }}"></script>
<script src="{{ URL::asset('assets/plugins/fileuploads/js/fileupload.js') }}"></script>
<script src="{{ URL::asset('assets/plugins/fileuploads/js/file-upload.js') }}"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<script>
// Select2
$('.select2').select2({
minimumResultsForSearch: Infinity
});
// Select2 by showing the search
$('.select2-show-search').select2({
minimumResultsForSearch: ''
});
</script>
<!-- X dan Y TTD -->
<script type="text/javascript">
var coordinates = function(element) {
element = $(element);
var top = element.position().top;
var left = element.position().left;
$('#resultsX').val('X: ' + left);
$('#resultsY').val('Y: ' + top);
}
$('#box').draggable({
start: function() {
coordinates('#box');
},
stop: function() {
coordinates('#box');
}
});
</script>
<!-- drag and drop gambar -->
<script type="text/javascript">
var imageLoader = document.getElementById('filePhoto');
imageLoader.addEventListener('change', handleImage, false);
function handleImage(e) {
var reader = new FileReader();
reader.onload = function (event) {
$('#uploader img').attr('src',event.target.result);
}
reader.readAsDataURL(e.target.files[0]);
}
var dropbox;
dropbox = document.getElementById("uploader");
dropbox.addEventListener("dragenter", dragenter, false);
dropbox.addEventListener("dragover", dragover, false);
dropbox.addEventListener("drop", drop, false);
function dragenter(e) {
e.stopPropagation();
e.preventDefault();
}
function dragover(e) {
e.stopPropagation();
e.preventDefault();
}
function drop(e) {
e.stopPropagation();
e.preventDefault();
//you can check e's properties
//console.log(e);
var dt = e.dataTransfer;
var files = dt.files;
//this code line fires your 'handleImage' function (imageLoader change event)
imageLoader.files = files;
}
</script>
#endsection

Validation of input on click submit button in a form

I am trying to validate my form, but the console never shows me errors. I have done what the Bootstrap documentation says and nothing happened. I want, for example, that when clicking on the button, if any field is empty, it shows an alert or error in that field. If someone can help me, I will be very grateful.
<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">
<script src="https://kit.fontawesome.com/e6233a0317.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="./css/product.css">
<link rel="stylesheet" href="./css/styles.css">
<link rel="stylesheet" href="./css/help.css">
<link rel="stylesheet" href="./css/tags.css">
<title>TejidosPulido E-Commerce</title>
</head>
<body>
<header id="header_menu"></header>
<br>
<main role="main">
<div class="container rounded" style="background-color: rgb(228, 225, 225);">
<br>
<form class="needs-validation" novalidate style="padding: 15px 40px;">
<div class="row">
<div class="col-sm-6" style="margin-bottom: 50px;">
<div class="input-group mb-3">
<span class="input-group-text title" for="validationDefault01">Número de producto</span>
<input type="text" class="form-control" id="inputNum" style="text-align: end;" required>
<div class="invalid-feedback">Please choose a username.</div>
</div>
<div class="input-group" style="width: 100%;">
<span class="input-group-text title" for="inputNum">Visible</span>
<div class="input-group-text" style="background: white">
<span class="input-group-addon"><input type="radio" id="visible" name="visibilidad" value="always"> Si</span>
<span class="input-group-addon"><input type="radio" id="invisible" name="visibilidad" value="never"> No</span>
</div>
</div>
<div class="invalid-feedback">Field empty.</div>
</div>
<div class="col-sm-6"></div>
</div>
<div class="row">
<div class="col-sm-7"></div>
<div class="col-sm-4">
<span class="input-group-text title">Imagen de producto</span>
</div>
<div class="col-sm-1"></div>
</div>
<div class="row">
<div class="col-sm-6" style="margin-bottom: 15px;">
<div class="input-group mb-3">
<span class="input-group-text title" for="inputName">Nombre del producto</span>
<input type="text" class="form-control" id="inputName" required>
</div>
<div class="invalid-feedback">Field empty.</div>
</div>
<div class="col-sm-1"></div>
<div class="col-sm-4">
<div class="input-group mb-3">
<input type="file" class="form-control" id="inputImage" accept="image/*">
</div>
</div>
<div class="col-sm-1"></div>
</div>
<br>
<div class="row">
<div class="col-sm-4" style="vertical-align: middle; padding-bottom: 10px;">
<div class="input-group mb-3">
<span class="input-group-text precio title">Precio</span>
<input type="text" class="form-control" id="inputPrecio" placeholder='0.00' required style="float: left; text-align: end; width: 30%;" pattern="([0-9]*)(.)?([0-9]*)" title="Introduce un número.">
<span class="input-group-text short">€/m</span>
</div>
<div class="invalid-feedback">Field empty.</div>
</div>
<div class="col-sm-4" style="vertical-align: middle; padding-bottom: 10px;">
<div class="input-group mb-3">
<span class="input-group-text peso title">Peso</span>
<input type="text" class="form-control" id="inputPeso" placeholder='0' required style="float: left; text-align: end; width: 30%;" pattern="([0-9]*)(.)?([0-9]*)" title="Introduce un número.">
<span class="input-group-text short">gr/m</span>
</div>
<div class="invalid-feedback">Field empty.</div>
</div>
<div class="col-sm-4" style="vertical-align: middle; padding-bottom: 10px;">
<div class="input-group mb-3">
<label class="input-group-text tipo-large" for="product_type" style="background: #0bbe83; color: white; font-weight: bold;">Tipo de producto</label>
<select class="form-select" id="product_type">
<option selected>Selecciona...</option>
<option value="referencia">Referencia</option>
<option value="color">Color</option>
</select>
</div>
</div>
</div>
<br>
<div class="row">
<div class="col-sm-6">
<span class="input-group-text title" for="inputDescripcion">Descripción:</span>
<textarea id="inputDescripcion" name="inputDescripcion" rows="5" style="width: 100%; padding: 10px;"></textarea>
</div>
<div class="col-sm-6">
<span class="input-group-text title" for="inputFunciones">Funciones bàsicas:</span>
<textarea id="inputFunciones" name="inputFunciones" rows="5" style="width: 100%; padding: 10px;"></textarea>
</div>
</div>
<br>
<div class="btn-group" role="group" style="float:right">
<button class="btn btn-dark" id="guardarButton" type="submit" class="btn btn-sm btn-outline-secondary">Guardar </button>
</div>
<br>
<br>
<br>
</form>
</div>
<hr class="featurette-divider">
<footer class="container" id= "footer"></footer>
</main>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.3/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.3/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.3/firebase-analytics.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.3/firebase-database.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.2.3/firebase-storage.js"></script>
<script src='./js/firebaseConfig.js'></script>
<script src="./js/session.js"></script>
<script src="./js/header.js"></script>
<script src="./js/newproducto.js"></script>
<script src="./js/footer.js"></script>
</body>
</html>
This is the javascript function:
(function () {
'use strict'
// Fetch all the forms we want to apply custom Bootstrap validation styles to
var forms = document.querySelectorAll('.needs-validation')
// Loop over them and prevent submission
Array.prototype.slice.call(forms)
.forEach(function (form) {
form.addEventListener('submit', function (event) {
if (!form.checkValidity()) {
event.preventDefault()
event.stopPropagation()
}
form.classList.add('was-validated')
}, false)
})
})()

Span for and input id should be the same.
In your case error is actually detecting but not able to assign to the correct id w.r.t for

"I am trying to validate my form, but the console never shows me
errors"
The console shouldn't show errors because the code is working as expected.
Most likely there's a conflict with one of the many other JS files included in your environment. Also the HTML is poorly is structured (2 class attributes on the button) and the invalid-feedback needs to be in the same parent as the inputs.

Javascript Null Error with LiveValidation

I have been trying to troubleshoot this error with the form submission. I am using the Livevalidation library in order to validate the email address field. Something isn't connecting properly to the library as I get this error in dev tools console. The library isnt getting called in under to validate the form field. Any help would be greatly appreciated.
ERROR:
Uncaught TypeError: Cannot read property 'form' of null
at LiveValidation.initialize (livevalidation_standalone.compressed.js:5)
at new LiveValidation (livevalidation_standalone.compressed.js:5)
at <anonymous>:2:13
at api.min.js:2
at Module.S (api.min.js:2)
at t.inlineScripts (api.min.js:2)
at api.min.js:2
HTML:
<form method="post" name="Camp-2021-05-Aware-ParkNeedsUs-FRM-Lightbox" action="https://s989596683.t.eloqua.com/e/f2" onsubmit="return handleFormSubmit(this)" id="form210" class="elq-form">
<input value="Camp-2021-05-Aware-ParkNeedsUs-FRM-Lightbox" type="hidden" name="elqFormName" />
<input value="989596683" type="hidden" name="elqSiteId" />
<input name="elqCampaignId" type="hidden" />
<div class="layout container-fluid">
<div class="row">
<div class="grid-layout-col">
<div class="layout-col col-sm-12 col-xs-12">
<div id="formElement0" class="elq-field-style form-element-layout row">
<!--div style="text-align:left;" class="col-sm-12 col-xs-12">
<label class="elq-label " for="fe2045">Email Address
</label>
</div-->
<div class="col-sm-12 col-xs-12">
<div class="row">
<div class="col-xs-12">
<div class="field-control-wrapper" style="width: 65%; margin-left: auto; margin-right: auto;">
<input
type="text"
class="elq-item-input"
name="emailAddress"
id="f20"
style="width: 100%; font-size: 14px; color: #828282;"
onfocus="if(this.value==this.defaultValue)this.value=''"
onblur="if(this.value=='')this.value=this.defaultValue"
value="Email Address"
maxlength="50"
/>
<script type="text/javascript">
var f20 = window.document.getElementById("f20");
</script>
<script type="text/javascript">
var f20 = new LiveValidation("email");
f20.add(Validate.Email);
</script>
<script type="text/javascript">
var title = new LiveValidation("title", { onlyOnSubmit: true });
title.add(Validate.Email);
</script>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="row">
<div class="grid-layout-col">
<div class="layout-col col-sm-12 col-xs-12">
<div id="formElement1" class="elq-field-style form-element-layout row">
<div class="col-sm-12 col-xs-12">
<div class="row">
<div class="col-xs-12">
<div align="center">
<input type="Submit" class="submit-button-style" value="Submit" id="fe2046" style="margin-top: 8px; background-color: #286140; padding: 12px; border: none; width: 65%; color: white;" />
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</form>
<script type="text/javascript" src="https://img04.en25.com/i/livevalidation_standalone.compressed.js"></script>

How to delete div and all element inside div? Javascript, html, css

I have a function that clears the entire div and it disappears but still appears in the inspect (html). This is a real problem because we have this input type field on the email and I got this empty data in email. I only want when this value is not chosen to completely remove me from html and inspect. Look at my code and try to catch the error. The most important things in the whole code that you need to pay attention are onchange="checkSelected()" in html and first script tag which manipulate with that. It should simply become a display none but it still stands there.
<div class="modal fade" id="montageModal" tabindex="-1" role="dialog">
<div class="modal-dialog" role="document">
<div class="modal-content" style="display: flex;">
<div class="modal-body">
<form id="schedule_form" class="clearfix" action="index.php?route=api/reifenmontage" method="post">
<div class="container-fluid">
<div class="step_1" >
<h3 class="modal-title">Reifenmontage Termin buchen </h3>
<div class="row termin_row">
<div class="col-xs-12 col-sm-4">
<div class="row">
<label>Pneu-Typ</label>
</div>
</div>
<div class="col-xs-12 col-sm-6">
<div class="row">
<select onchange="checkSelected()" class="form-control" name="pneu" id="pneu">
<option value="Motorrad">Motorrad</option>
<option value="Auto">Auto</option>
</select>
</div>
</div>
</div>
<div id="additionalRow" class="row termin_row" >
<div id="reifenmontage-input" class="row termin_row">
<div class="col-xs-12 col-sm-4">
<div class="row">
<label>Mark und model</label>
</div>
</div>
<div class="col-xs-12 col-sm-4">
<div class="row">
<select name="marka" class="form-control" id="button-getdata">
</select>
</div>
</div>
<div class="col-xs-12 col-sm-4">
<div class="row">
<select name="model" class="form-control" id="result" >
</select>
</div>
</div>
</div>
</div>
<div class="row termin_row">
<div class="col-sm-4 col-xs-12">
<div class="row"><label>2. Terminvorschlag</label></div>
</div>
<div class="col-sm-4 col-xs-6">
<div class="row">
<div class="input-group date" id="date-2" data-termin="1">
<input type='text' class="form-control" name="date[1]" />
<span class="input-group-addon">um</span>
</div>
</div>
</div>
<div class="col-sm-4 col-xs-6">
<div class="row">
<div class="input-group time" id="time-2" data-termin="1">
<input type='text' class="form-control" name="time[1]" />
<span class="input-group-addon">Uhr</span>
</div>
</div>
</div>
</div>
<div class="row">
<div class="checkbox">
<label>
<input type="checkbox" name="accept" id="accept"> Ich akzeptiere die Teilnahmebedingungen
</label>
</div>
</div>
<div class="row text-center">
<button type="button" class="btn btn-primary btn-lg btn-submit" id="next_step" disabled="disabled">Anfrage senden</button>
</div>
</div>
<div class="step_2">
<h3 class="modal-title">Your contact info</h3>
<div class="">
<div class="form-group clearfix">
<input type="text" name="name" value="<?= $user['name'] ?>" placeholder="Name and Lastname" class="form-control name text" required />
</div>
<div class="form-group clearfix">
<input type="text" name="phone" value="<?= $user['phone'] ?>" placeholder="Phone" class="form-control phone text" required />
</div>
<div class="form-group clearfix">
<input type="email" name="email" value="<?= $user['email'] ?>" placeholder="Email" class="form-control email text" required />
</div>
<div class="text-center">
<button type="submit" id="submit" class="btn btn-default btn-lg btn-submit" >Suchen</button>
</div>
</div>
</div>
</div>
</form>
</div>
<div class="modal-footer">
<button type="button" class="close" data-dismiss="modal" aria-label="Close">SCHLIESSEN</button>
</div>
</div>
</div>
</div>
and my script tag
<script type="text/javascript">
let selectItem = document.getElementById('pneu');
let additionalRow = document.getElementById('additionalRow');
function checkSelected() {
if (selectItem.selectedIndex == "1") {
additionalRow.style.display = 'none';
} else {
additionalRow.style.display = 'block';
}
}
</script>
<script type="text/javascript">
$('#button-getdata').on('change', function() {
$.ajax({
url: 'index.php?route=api/reifenmontage/get_marka_data',
type: 'post',
data: $('#reifenmontage-input select'),
dataType: 'json',
beforeSend: function() {
},
success: function(json) {
if (json['success']) {
$("#result").empty();
for (i in json['success']) {
var element = json['success'][i];
var o = new Option(element['model'], element['model']);
$("#result").append(o);
html = "\t<option value=\""+ element['model'] + "\">" + element['model'] + "</option>\n";
$("#result").append(o);
}
// document.getElementById("schedule_form").reset();
}
}
});
});
</script>
<script type="text/javascript">
$.ajax({
url: 'index.php?route=api/reifenmontage/mark',
context: document.body,
success: function(data) {
const selectControl = $('#button-getdata');
selectControl.html(data.map(ExtractData).join(''));
}
});
function ExtractData(item) {
return ` <option value="${item.value}">${item.label}</option>`;
}
</script>

Try variant with detaching/attaching DOM elements
<script type="text/javascript">
let selectItem = document.getElementById('pneu');
//let additionalRow = document.getElementById('additionalRow');
let detached = '';
function checkSelected() {
if (selectItem.selectedIndex == "1") {
detached = $('#reifenmontage-input').detach();
} else {
detached.appendTo('#additionalRow');
}
}
</script>

Want to use Angularjs validation instead of Browser validation

I have a form which holds two ng-forms where i am validating the input. I have two questions regarding my forms.
1) In the input Company I want to validate for the minlength, but my approach seems not to work. How can i solve this problem?
2) I want to use Angularjs validation with my error messages but the browser automatically shows "This input is invalid" AND Internet Explorer does not validate at all. Where is my fault? I already tried nonvalidate and ng-required but then my form does submit without validation.
Here is the plunkr link : Plunkr
Thanks in advance,
YB
var app = angular.module('plunker', []);
app.controller('MainCtrl', function($scope) {
$scope.billingAdrEqualsShippingAdr = false;
$scope.confirmBillingEqualsShipping = true;
$scope.changeBillingAddress = false;
$scope.shippingAddress = {};
$scope.billingAddress = {};
$scope.setBillingAddress = function (){
$scope.changeBillingAddress = true;
$scope.billingAddress = $scope.shippingAddress;
};
$scope.cancelBillingAddress = function (){
$scope.changeBillingAddress = false;
$scope.billingAddress = $scope.shippingAddress;
};
$scope.openCompanyModal = function (company){
$scope.billingAddress = company;
$scope.shippingAddress = company;
};
$scope.submit = function (){
console.log("Form submitted");
}
});
<!DOCTYPE html>
<html ng-app="plunker">
<head>
<meta charset="utf-8" />
<title>AngularJS Plunker</title>
<link data-require="bootstrap-css#*" data-semver="3.3.6" rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.css" />
<script>
document.write('<base href="' + document.location + '" />');
</script>
<link rel="stylesheet" href="style.css" />
<script data-require="angular.js#1.4.x" src="https://code.angularjs.org/1.4.9/angular.js" data-semver="1.4.9"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
<form name="addressForm" ng-submit="submit()">
<div ng-form="shippingForm">
<div class="row">
<div class="col-md-12">
<h3 class="form-group">
<label>Lieferadresse</label>
</h3>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Salutation</label>
</div>
<div class="col-md-8">
<select name="salutation" ng-model="shippingAddress.salutation" class="form-control" ng-change="refreshBillingAddress()" ng-required="true">
<option></option>
<option value="Herr">Herr</option>
<option value="Frau">Frau</option>
</select>
<span ng-show="submitted && shippingForm.salutation.$error.required"></span>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Firsname</label>
</div>
<div class="col-md-8">
<input type="text" name="prename" ng-model="shippingAddress.prename" ng-required="true" class="form-control" ng-change="refreshBillingAddress()"/>
<span ng-show="submitted && shippingForm.prename.$error.required">Required</span>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Lastname</label>
</div>
<div class="col-md-8">
<input type="text" name="surname" ng-model="shippingAddress.surname" required="" class="form-control" ng-change="refreshBillingAddress()"/>
<span ng-show="submitted && shippingForm.surname.$error.required">Required</span>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Company</label>
</div>
<div class="col-md-8">
<input type="text" name="company" ng-model="shippingAddress.company" required="" ng-minlength="10" class="form-control" ng-change="refreshBillingAddress()"/>
<span ng-show="submitted && shippingForm.company.$error.required">Required</span>
<span ng-show="submitted && shippingForm.company.$error.minlength">Minlength = 10</span>
</div>
</div>
</div >
<div class="row">
<div class="col-md-12">
<h3 class="form-group">
<label>Rechnungsadresse</label>
<div ng-click="setBillingAddress()" ng-show="changeBillingAddress === false" class="btn btn-default pull-right">Ändern</div>
<div ng-click="cancelBillingAddress()" ng-show="changeBillingAddress === true" class="btn btn-danger pull-right">Abbrechen</div>
</h3>
</div>
<div ng-show="changeBillingAddress == false" class="row">
<div class="col-md-offset-1">Identisch mit Lieferadresse</div>
</div>
</div>
<div ng-show="changeBillingAddress == true">
<div style="margin-top: 5px">
<div ng-form="billingForm">
<div class="row form-group">
<div class="col-md-4">
<label>Salutation</label>
</div>
<div class="col-md-8">
<select name="salutation" ng-model="billingAddress.salutation" ng-required="changeBillingAddress == true" class="form-control">
<option></option>
<option value="Herr">Herr</option>
<option value="Frau">Frau</option>
</select>
<span ng-show="submitted" class="help-block">Pflichtfeld</span>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Firstname</label>
</div>
<div class="col-md-8">
<input type="text" name="prename" ng-model="billingAddress.prename" ng-required="changeBillingAddress == true" class="form-control"/>
<span ng-show="submitted && billingForm.prename.required" class="help-block">Pflichtfeld</span>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Lastname</label>
</div>
<div class="col-md-8">
<input type="text" name="surname" ng-model="billingAddress.surname" ng-required="changeBillingAddress == true" class="form-control"/>
<span ng-show="submitted && billingForm.surname.$error.required"></span>
</div>
</div>
<div class="row form-group">
<div class="col-md-4">
<label>Company</label>
</div>
<div class="col-md-8">
<input type="text" name="company" ng-model="billingAddress.company" ng-required="changeBillingAddress == true" class="form-control"/>
<span ng-show="submitted && billingForm.company.$error.required"></span>
</div>
</div>
</div>
</div>
</div>
<div class="row">
<div style="padding-top: 1em" class="col-md-12">
<button ng-click="previousTab(0)" class="btn btn-default pull-left">Back</button>
<button type="submit" class="btn btn-default pull-right">Next</button>
</div>
</div>
</form>
</body>
</html>

Here is your plunker, i corrected some parts (until Rechnungsaddresse):
http://plnkr.co/edit/luVETXTVCf2PkNAKzK1Z?p=preview
I guess you can use <form name="addressForm"... or <div ng-form="addressForm"
but both seems to make problems.
submitted was never set, so i added it in the way i guess you intended