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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>

knockout js, add additional elements to an array

I have an app where I want to add extra elements to an item in an array, I have created a fiddle of what I'm trying to achieve.
So the user starts the app, they click next fill in some details of an item and a description, they then should click next and fill in a price for the item(this is where I'm stuck). This example works up to a point, as in whenever I try and implement the price part I seem to be getting it wrong. You'll see once I click next the item is added to the array, however how do add more elements to the current item in the array. In case I've not made sense the logic should be:
Start
Page one (enter name and description)
Page two (enter price)
I understand I could do this all on one page but I don't want to I want knockout to be able to add a price after the name and description page. I would also like to be able to go back and amend the item. Can you anybody help in seeing what I should be doing next?
When I insert the name and description, do I have to also make an empty element in the array for the price? Then once the price is entered somehow insert this into the price element in the array? Not sure how/if this should be implemented.
This is my first knockout app so I be surprised if what I've actually done is correct, any help or pointers gratefully received :)
My code is below:
$(function() {
var main = new stuff();
ko.applyBindings(main, $('#ko')[0]);
});
function Item(data) {
this.itemname = ko.observable(data.itemname);
this.itemdescription = ko.observable(data.itemdescription);
this.itemenabled = ko.observable(data.itemenabled);
}
function stuff() {
var self = this;
self.items = ko.observableArray([]);
self.newItemName = ko.observable();
self.newItemDescription = ko.observable();
self.newItemEnabled = ko.observable();
// Operations
self.addItem = function() {
self.items.push(new Item({
itemname: this.newItemName(),
itemdescription: this.newItemDescription(),
itemenabled: this.newItemEnabled()
}));
};
};
//jquery stuff
$('#start').on('click', function(e) {
$("#page1").show(500);
$('#panel1').css('visibility', 'visible').hide().fadeIn().removeClass('hidden');
$("#start").hide(500);
})
$('#back').on('click', function(e) {
$("#panel1").hide(500);
$("#page1").hide(500);
$("#start").show(500);
})
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<button type="submit" class="btn btn-primary" id="start">Start</button>
<div id="ko">
<div class="panel panel-default hidden" id="panel1">
<div id="page1">
<form data-bind="submit: addItem">
<div class="panel panel-default" style="padding: 15px 0px 0px 0px;" id="panel2">
<div class="container">
<div class="form-group row">
<label for="inputItemName" class="col-lg-3 col-form-label">Enter Item Name</label>
<div class="col-lg-8">
<input type="text" class="form-control form-control-lg" id="inputItemName" data-bind="value: newItemName" placeholder="">
</div>
</div>
<div class="form-group row">
<label for="textareaItemDescription" class="col-lg-3 col-form-label">Enter Item Description</label>
<div class="col-lg-8">
<textarea class="form-control" id="textareaItemDescription" rows="3" data-bind="value: newItemDescription"></textarea>
</div>
</div>
<div class="form-group row">
<div class="col-sm-offset-3 col-sm-9">
<label class="custom-control custom-checkbox checkbox-inline no_indent" style="font-weight:bold;">
<input type="checkbox" class="custom-control-input" checked="checked" data-bind="checked: newItemEnabled">
<span class="custom-control-indicator"></span>
<span class="custom-control-description" style="padding-bottom: 2px;">Enabled</span>
</label>
</div>
</div>
</div>
</div>
<button type="button" class="btn btn-primary" id="back">Back</button>
<div class="pull-right">
<button type="submit" class="btn btn-primary" id="next1">Next</button>
</div>
</form>
</div>
</div>
<ul data-bind="foreach: items, visible: items().length > 0">
<li>
<input data-bind="value: itemname" style="color: black;" />
</li>
<li>
<input data-bind="value: itemdescription" style="color: black;" />
</li>
<li>
<input type="checkbox" data-bind="checked: itemenabled" />
</li>
</ul>
</div>

Ok, so I have added a new observable to track the page number along with basic functions to increment/decrement the number then I simply add the new item after the price has also been added.
$(function() {
var main = new stuff();
ko.applyBindings(main, $('#ko')[0]);
});
function Item(data) {
this.itemname = ko.observable(data.itemname);
this.itemdescription = ko.observable(data.itemdescription);
this.itemenabled = ko.observable(data.itemenabled);
this.price = ko.observable(data.itemprice);
}
function stuff() {
var self = this;
self.items = ko.observableArray([]);
self.newItemName = ko.observable();
self.newItemDescription = ko.observable();
self.newItemEnabled = ko.observable();
self.newItemPrice = ko.observable();
self.page = ko.observable(1);
// Operations
self.next = function() {
if (self.page() === 2) {
self.addItem();
}
self.page(self.page() + 1)
}
self.back = function() {
if (self.page() == 1) {
$("#panel1").hide(500);
$("#page1").hide(500);
$("#start").show(500);
}
self.page(self.page() - 1);
}
self.addItem = function() {
self.items.push(new Item({
itemname: this.newItemName(),
itemdescription: this.newItemDescription(),
itemenabled: this.newItemEnabled(),
itemprice: this.newItemPrice(),
}));
};
};
//jquery stuff
$('#start').on('click', function(e) {
$("#page1").show(500);
$('#panel1').css('visibility', 'visible').hide().fadeIn().removeClass('hidden');
$("#start").hide(500);
})
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<button type="submit" class="btn btn-primary" id="start">Start</button>
<div id="ko">
<div class="panel panel-default hidden" id="panel1">
<div id="page1">
<form data-bind="submit: next">
<div class="panel panel-default" style="padding: 15px 0px 0px 0px;" id="panel2">
<div class="container" data-bind="if: page() == 1">
<div class="form-group row">
<label for="inputItemName" class="col-lg-3 col-form-label">Enter Item Name</label>
<div class="col-lg-8">
<input type="text" class="form-control form-control-lg" id="inputItemName" data-bind="value: newItemName" placeholder="">
</div>
</div>
<div class="form-group row">
<label for="textareaItemDescription" class="col-lg-3 col-form-label">Enter Item Description</label>
<div class="col-lg-8">
<textarea class="form-control" id="textareaItemDescription" rows="3" data-bind="value: newItemDescription"></textarea>
</div>
</div>
<div class="form-group row">
<div class="col-sm-offset-3 col-sm-9">
<label class="custom-control custom-checkbox checkbox-inline no_indent" style="font-weight:bold;">
<input type="checkbox" class="custom-control-input" checked="checked" data-bind="checked: newItemEnabled">
<span class="custom-control-indicator"></span>
<span class="custom-control-description" style="padding-bottom: 2px;">Enabled</span>
</label>
</div>
</div>
</div>
</div>
<div class="container" data-bind="if: page() == 2">
<div class="form-group row">
<label for="inputPrice" class="col-lg-3 col-form-label">Enter Price</label>
<div class="col-lg-8">
<input type="text" class="form-control form-control-lg" id="inputPrice" data-bind="value: newItemPrice" placeholder="">
</div>
</div>
</div>
<button type="button" data-bind="click: back" class="btn btn-primary" id="back">Back</button>
<div class="pull-right">
<button type="submit" class="btn btn-primary" id="next1">Next</button>
</div>
</form>
</div>
</div>
<ul data-bind="foreach: items, visible: items().length > 0">
<li>
<input data-bind="value: itemname" style="color: black;" />
</li>
<li>
<input data-bind="value: itemdescription" style="color: black;" />
</li>
<li>
<label for="price">Price</label>
<input id="price" data-bind="value: price" style="color: black;" />
</li>
<li>
<input type="checkbox" data-bind="checked: itemenabled" />
</li>
</ul>
</div>

group radio inputs validation

I got little problem with append error state. I got 7 radio inputs and after submit I got 7 error states under group.
Could some one help me figure out how to modify the code.
<form class="register-form">
<div class="col-lg-8 col-lg-offset-2 col-md-8 col-md-offset-2 col-sm-10 col-sm-offset-1 margin-top-20">
<h4 class="text-center"> TEST TEST</h4>
<div class="question-box">
<p class="margin-top-20"><span class="red">*</span>1. QUESTION.</p>
<div class="col-lg-6 col-lg-offset-3 form-group text-center question">
<div class="radio-item" >
<input type="radio" id="case1" name="case" value="0-50" required data-step2="1">
<label for="case1">0 - 50</label>
</div>
<div class="radio-item">
<input type="radio" id="case2" name="case" value="50-100" required data-step2="1">
<label for="case2">50 - 100</label>
</div>
<div class="radio-item">
<input type="radio" id="case3" name="case" value="100+" required data-step2="1">
<label for="case3">Over 100</label>
</div>
</div>
</div>
<div class="question-box">
<p class="margin-top-20"><span class="red">*</span>2. QUESTION</p>
<div class="col-lg-6 col-lg-offset-3 form-group text-center question">
<div class="radio-item">
<input type="radio" id="resell1" name="resell" value="1" required data-step2="1">
<label for="resell1">YES</label>
</div>
<div class="radio-item">
<input type="radio" id="resell2" name="resell" value="0" required data-step2="1">
<label for="resell2">NO</label>
</div>
</div>
</div>
<div class="question-box">
<p class="margin-top-20"><span class="red">*</span>3.QUESTION</p>
<div class="col-lg-6 col-lg-offset-3 form-group text-center question">
<div class="radio-item">
<input type="radio" id="export1" name="export" value="1" required data-step2="1">
<label for="export1">YES</label>
</div>
<div class="radio-item">
<input type="radio" id="export2" name="export" value="0" required data-step2="1">
<label for="export2">NO</label>
</div>
</div>
</div>
</div>
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12 margin-top-20 text-center">
<button id="submit-registration" type="submit" class="btn btn-success radius send" >Continue</button>
</div>
</form>
https://jsfiddle.net/13j34o0g/1
thx

I've changed a few things in your code and i think this might be what you are looking for.
Example here
The first code below will loop through you input's why the name attribute. that means it will only run it 3 times
$(".invalid-info").remove(); // Removes the error messages before we run the validation.
var group = {};
$('input[name^="case"], input[name^="resell"], input[name^="export"]').each(function(index) {
var $this = $(this);
var name = this.name;
if (!group[name]) {
group[name] = true;
if (!testRadio($this, options.showValidOnCheck)) validated = false;
}
});
And i changed.
var value = $form.find('input[name="' + name + '"]').is(":checked");
if (!value) {
$('<p class="invalid-info" style="color: red">Please choose corect answer</p>').appendTo($($input).parent().parent())
return false;
}
Let me know if this is what you were looking for.

How to set radio button checked initially in AngularJs?

I have created two tabs where the tabs gets navigated by checking radio buttons. One of the two tabs will be active initially but I need to have the corresponding radio button too checked initially.
<div ng-app="myApp">
<div class="account-tab-selector" id="tabs" ng-controller="TabsCtrl">
<ul>
<li class="col-sm-6 text-center" ng-repeat="tab in tabs">
<label for="{{tab.url}}">
<input ng-class="{active:isActiveTab(tab.url)}" ng-click="onClickTab(tab)" type="radio" name="radio" id="{{tab.url}}" ng-model="choice.isSelected" value="true">{{tab.title}}</label>
</li>
</ul>
<div class="clearfix"></div>
<div id="mainView">
<div ng-include="currentTab"></div>
</div>
</div>
<script type="text/ng-template" id="one.tpl.html">
<div class="customer-reg-form" id="new_customer_form">
<div class="sign-up-fb">
<a href="#"><i class="fa fa-facebook" aria-hidden="true"></i>
Sign Up With Facebook</a>
</div>
<div class="reg-form">
<div class="or-separator"><span>OR</span></div>
<div class="row">
<div class="col-sm-6 form-group">
<label for="fname">First Name<span>*</span></label>
<div class="input-group">
<input name="firstname" id="fname">
</div>
</div>
<div class="col-sm-6 form-group">
<label for="lname">Last Name<span>*</span></label>
<div class="input-group">
<input name="lastname" id="lname">
</div>
</div>
<div class="col-sm-6 form-group">
<label for="mnumber">Mobile Number<span>*</span></label>
<div class="input-group">
<input name="mobile-number" id="mnumber">
</div>
</div>
<div class="col-sm-6 form-group">
<label for="dlocation">Default Location<span>*</span></label>
<div class="input-group">
<select name="default-location" class="dropstyle">
<option></option>
<option>Kansas</option>
</select>
</div>
</div>
<div class="col-sm-12 form-group">
<label for="email">Email Address<span>*</span></label>
<div class="input-group">
<input name="email" id="email">
</div>
</div>
<div class="col-sm-12 form-group">
<label for="password">Password<span>*</span></label>
<div class="input-group">
<input name="password" id="password">
</div>
</div>
</div>
<div class="agreement">By clicking "Register" below, you are agreeing to our Terms of Service agreement.</div>
</div>
</div>
</script>
<script type="text/ng-template" id="two.tpl.html">
<div class="customer-reg-form" id="existing_customer_form">
<div class="sign-up-fb">
<a href="#"><i class="fa fa-facebook" aria-hidden="true"></i>
Login With Facebook</a>
</div>
<div class="reg-form">
<div class="or-separator"><span>OR</span></div>
<div class="row">
<div class="col-sm-12">
<label for="mnumber">Email Address<span>*</span></label>
<input id="mnumber">
</div>
<div class="col-sm-12">
<label for="mnumber">Password<span>*</span></label>
<input id="mnumber">
</div>
</div>
<div class="forgot-pwd">Forgot Password?</div>
</div>
</div>
</script>
</div>
var app = angular.module("myApp", []);
app.controller('TabsCtrl', ['$scope', function($scope) {
$scope.tabs = [{
title: 'I am a new customer',
url: 'one.tpl.html',
isSelected: true
}, {
title: 'I have an account',
url: 'two.tpl.html'
}];
$scope.currentTab = 'one.tpl.html';
$scope.onClickTab = function(tab) {
$scope.currentTab = tab.url;
};
$scope.isActiveTab = function(tabUrl) {
return tabUrl == $scope.currentTab;
};
}]);
Jsfiddle here

You have bound your radio button with $scope.choice.isSelected, you can set the value for this in controller or in ng-init it self.
Can you please add below two lines in your controller?
$scope.choice={};
$scope.choice.isSelected = "true";
Or in much better way, you can modify your tag like:
<li class="col-sm-6 text-center" ng-repeat="tab in tabs">
<label for="{{tab.url}}">
<input ng-class="{active:isActiveTab(tab.url)}" ng-click="onClickTab(tab)" type="radio" name="radio" id="{{tab.url}}" ng-model="tab.isRadioChecked" value="true">{{tab.title}}</label>
</li>
And in your controller.
$scope.tabs = [{
title: 'I am a new customer',
url: 'one.tpl.html',
isSelected: true,
isRadioChecked: "true"
}, {
title: 'I have an account',
url: 'two.tpl.html'
}];

You can do this simply by setting the checked attribute for the input. For example:
<input type="radio" checked> This is a radio button

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