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jQuery: Adding html elements dynamically using jquery

I want to add some html elements dynamically using jQuery inside a form tag but it is not working .
$(document).ready(function() {
var requirements = 0;
var container = $(document.createElement('div').addClass('form-group'));
$('#add-req').click(function() {
if (requirements <= 15) {
requirements = requirements + 1;
$(container).append('<input type="text" name="name" class="form-control" placeholder="Requirement" title="Enter next requirement" required="">');
$('#requirement-div').after(container);
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="register-form pt-md-4" id="requirement-div">
<form action="#" method="post">
<div class="styled-input form-group">
<input type="text" class="form-control" placeholder="Your Name" name="Course name" required="">
</div>
<div class="styled-input">
<div class="form-group">
<input type="text" name="name" class="form-control" placeholder="Requirement" title="Please enter requirement" required="">
</div>
<input type="button" value="add Requirements" id="add-req">
<input type="submit" value="Submit">
</div>
</form>
</div>
when I click add requirement button it should create another div tag and input element inside form element.

Just replace the code $(document.createElement('div').addClass('form-group')); to $(document.createElement('div')).addClass('form-group');

Try the following
We can directly Insert a html element to the targer Element as follow
$(document).ready(function(){
var requirements=0;
$('#add-req').click(function(){
if(requirements<=15){
requirements=requirements+1;
$('#requirement-div').after('<div class="form-group"><input type="text" name="name" class="form-control" placeholder="Requirement" title="Enter next requirement" required=""></div>');
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="register-form pt-md-4" id="requirement-div">
<form action="#" method="post" >
<div class="styled-input form-group">
<input type="text" class="form-control" placeholder="Your Name" name="Course name" required="">
</div>
<div class="styled-input">
<div class="form-group">
<input type="text" name="name" class="form-control" placeholder="Requirement" title="Please enter requirement" required="">
</div>
<input type="button" value="add Requirements" id="add-req">
<input type="submit" value="Submit">
</div>
</form>
</div>

you mixing between JS and JQuery, where document.createElemet('div') is a JS function while addClass is a JQuery function.
$(document).ready(function(){
var requirements = 0;
var container=$('<div>').addClass('form-group');
$('#add-req').click(function(){
if(requirements<=15){
requirements=requirements+1;
container.append('<input type="text" name="name" class="form-control" placeholder="Requirement" title="Enter next requirement" required="">');
$(this).before(container);
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="register-form pt-md-4" id="requirement-div">
<form action="#" method="post" >
<div class="styled-input form-group">
<input type="text" class="form-control" placeholder="Your Name" name="Course name" required="">
</div>
<div class="styled-input">
<div class="form-group">
<input type="text" name="name" class="form-control" placeholder="Requirement" title="Please enter requirement" required="">
</div>
<input type="button" value="add Requirements" id="add-req">
<input type="submit" value="Submit">
</div>
</form>
</div>

Replace the Below Code
<script>
$(document).ready(function(){
var requirements=0;
var container=$(document.createElement('div')).addClass('form-group');
$('#add-req').click(function(){
if(requirements<=15){
requirements=requirements+1;
$(container).append('<input type="text" name="name" class="form-control" placeholder="Requirement" title="Enter next requirement" required="">');
$('#requirement-div').after(container);
}
});
});
</script>

I wrote a script here (Adding html elements dynamically using jquery) that you can test
<form action="#" method="post">
<div class="form-group">
<input type="text" class="form-control test" placeholder="Your Name" name="Course name" required="">
</div>
<div class="form-group">
<input type="text" name="name" class="form-control" placeholder="Requirement" title="Please enter requirement" required="">
</div>
<div class="styled-input">
<input type="button" class="btn btn-primary" value="Add Requirements" id="add-req">
<input type="submit" class="btn btn-primary" value="Submit">
</div>
</form>
JQuery Code
$(function() {
var requirements=0;
$('#add-req').click(function(e){
e.preventDefault();
$('.test').val('Okay');
if(requirements <= 15) {
$('.styled-input').prepend('<div class="form-group"><input type="text" name="name" class="form-control" placeholder="Requirement" title="Enter next requirement" required=""></div>');
requirements++;
} else {
alert('Max requirement has been reached');
}
});
});

Generating form fields using jquery

I have a pretty basic form that allow user to post simple classified ads. It looks like this:
<form action="">
<fieldset>
<h3>Personal Informations</h3>
<input type="text" placeholder="Your Name">
<input type="text" placeholder="Your Address">
</fieldset>
<fieldset>
<h3>Car Informations</h3>
<input type="text" placeholder="Manufacturer">
<input type="text" placeholder="Model">
<input type="text" placeholder="Year">
Add More Ads
</fieldset>
</form>
I would like to allow the visitor to post more ads then one via "Add More Ads" button/link which would generate same 3 fields as much times as visitor needs ads.
What would be the simplest solution to do this? Any help/guide would be great!
Thanks!
P.S Also it would be great if the user could also remove the fields if he doesnt need them

Try this.
$('#addMOre').on('click',function(){
var self = $('.apendable').first().clone().insertAfter(".apendable:last");
$('.apendable:last input').val('');
self.append('<button class="close-info">close</button>');
$('.close-info').on('click', function(){
$(this).parent().remove();
})
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="">
<fieldset>
<h3>Personal Informations</h3>
<input type="text" placeholder="Your Name">
<input type="text" placeholder="Your Address">
</fieldset>
<fieldset id="info">
<h3>Car Informations</h3>
<div class="apendable">
<input type="text" placeholder="Manufacturer">
<input type="text" placeholder="Model">
<input type="text" placeholder="Year">
</div>
Add More Ads
</fieldset>
</form>

You can set inputs in <div class="row"> then copy first row class.
$("#addAdsFiels").click(function(){
var clone = $(this).siblings(".row:first").clone();
$(clone).find("input").val("");
$(this).before(clone);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="">
<fieldset>
<h3>Personal Informations</h3>
<input type="text" placeholder="Your Name">
<input type="text" placeholder="Your Address">
</fieldset>
<fieldset>
<h3>Car Informations</h3>
<div class="row">
<input type="text" placeholder="Manufacturer">
<input type="text" placeholder="Model">
<input type="text" placeholder="Year">
</div>
Add More Ads
</fieldset>
</form>

Send value from another form

I have multiple forms that point to the same site where the datas are stored into a sql database. For each form the user has to fill out a textfield which is separated from the form. I don't understand how i could send for each form the same value from the separated textfield.
<form name="user" action="http://hello.xy/login.php" method="GET">
<input type="text" value="User" name="provider" hidden>
Name: <br/>
<input type="text" value="" name="user_name"><br/>
Email: <br/>
<input type="text" value= "" name="user_email"><br/>
<textarea hidden name="comment" value="value from the form comment"></textarea>
<input type="submit" value="submit">
</form>
<form name="google" action="http://hello.xy/login.php" method="GET">
<input type="text" value="Google" name="provider" hidden>
<textarea hidden name="comment" value="value from the form comment"></textarea>
<input type="image" src="images/logos/google.png" value="submit">
</form>
<form name="twitter" action="http://hello.xy/login.php" method="GET">
<input type="text" value="Twitter" name="provider" hidden>
<textarea hidden name="comment" value="value from the form comment"></textarea>
<input type="image" src="images/logos/twitter.png" value="submit">
</form>
<form name="facebook" action="http://hello.xy/login.php" method="GET">
<input type="text" value="Facebook" name="provider" hidden>
<textarea hidden name="comment" value="value from the form comment"></textarea>
<input type="image" src="images/logos/facebook.png" value="submit">
</form>
Separated textfield, but on the same site:
<form name="comment" >
<textarea name="input" ></textarea>
</form>
I hope somebody can help me.
Thanks,
Misch

You can't send data from two forms at the same time without JavaScript.
The solution without JavaScript is to use one form:
<form action="http://hello.xy/login.php" method="GET">
<textarea name="comment"></textarea>
<label for="user_name">Name</label>
<input type="text" name="user_name" id="user_name">
<label for="user_email">Email</label>
<input type="text" name="user_email" id="user_email">
<button type="submit" name="provider" value="User">Submit</button>
<input type="image" src="images/logos/google.png" name="provider" value="Google">
...
</form>
Update
Since you're using jQuery, use:
<textarea name="comment" class="comment-visible"></textarea>
And include this in each form:
<input type="hidden" name="comment" class="comment-hidden">
jQuery:
$(document).on('input', '.comment-visible', function(){
$('.comment-hidden').val( $(this).val() );
});

A <textarea> doesn't have a value= attribute. The value is the text node inside. ex.
<textarea>value</textarea>

Javascript failing to validate form

I am having trouble pinpointing why my javascript code is failing to validate the form on the bottom. Any help is appreciated. I'm new and learning when in comes to javascript.
Here's the javascript:
<script type="text/javascript" language="javascript">
function validate(){
//Initialize array
var field = new Array;
var field = [document.getElementById('first_name'),document.getElementById('last_name'),document.getElementById('address'),document.getElementById('eadress'),document.getElementById('city'),document.getElementById('state'),document.getElementById('telephone'),document.getElementById('comments')];
//Error tracker
var error = 0;
//Validation Loop
for (i=0;i<field.length;i++)
{
if (field[i].value == "")
{
error++;
}
}
//If no errors are present, submit
if (error == 0)
{
document.contact-form.submit();
}
//Else, display alert
else {
alert("One or more fields are empty.");
return false;
}
}
Here's the form:
<div id="registration">
<form action="" method="post" onsubmit="return validate();" id="contact-form">
<h2>Contact Us
</h2>
<div>
<label for="first_name">First Name:</label>
<input id="first_name" name="first_name" type="text" class="required" />
</div>
<div>
<label for="last_name">Last Name:</label>
<input id="last_name" name="last_name" type="text" class="required" />
</div>
<div>
<label for="address">Address:</label>
<input id="address" name="address" type="text" />
</div>
<div>
<label for="city">City:</label>
<input id="city" name="city" type="text" />
</div>
<div >
<label for="state">State:</label>
<input id="state" name="state" type="text" />
</div>
<div >
<label for="zip">Zip:</label>
<input id="zip" name="zip" type="text" />
</div>
<div>
<label for="eaddress">Email address:</label>
<input id="eaddress" name="eaddress" type="text" class="required"/>
</div>
<div>
<label for="telephone">Telephone:</label>
<input id="telephone" name="telephone" type="text" />
</div>
<div>
<label>Comments:</label>
<textarea rows="4" cols="4" name="comments" id="comments" ></textarea>
</div>
<div>
<label></label>
<input id="submit" type="submit" value="Submit" />
<input id="reset" type="reset" value="Reset" />
</div>
</form>

I just corrected your code. it seems that in the array you are asking for eadress and the field is eaddress with 2 d's

In the script, you misspelt eaddress as eadress :)

You misspelled one of the fields ids in your array definition document.getElementById('eadress') is eaddress in HTML id attribute

post http in form not working

POST http method in my form does not work when I use JavaScript:
<form id="user" method="post"action="url" onsubmit="return false;">
<span>First Name:</span>
<input type="text" class="input" id="fname" name="fname" required>
<span>last Name:</span>
<input type="text" class="input" id="lname" name="lname" required>
<input class="button" type="submit" value="submit" onclick = "checkForm()">
</form>
However, it does seem to work when I do not use JavaScript:
<form id="user" method="post"action="url">
<span>First Name:</span>
<input type="text" class="input" id="fname" name="fname" required>
<span>last Name:</span>
<input type="text" class="input" id="lname" name="lname" required>
<input class="button" type="submit" value="submit">
</form>
How can I use JavaScript validations in my form and send the form to a given URL?

<form id="user" method="post"action="url" onsubmit="return checkForm();">
<!-- blah blah-->
<input class="button" type="submit" value="submit">
</form>
Thanks for your help; this is working fine now.

It is not submitting to server because onsubmit="return false;" tells the browser the validation failed and do not send to server. If onsubmit is not specified or returns true the data will be submitted to the specified url. The following code should work if the function checkForm() returns true when passing validation and returns false while failing validation.
<form id="user" method="post" action="url" onsubmit="checkForm()">
<span>First Name:</span>
<input type="text" class="input" id="fname" name="fname" required>
<span>Last Name:</span>
<input type="text" class="input" id="lname" name="lname" required>
<input class="button" type="submit" value="submit">
</form>