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I am creating a HTML form in which I need to create a 'add more' button so another field appears. Any help would be appreciated

This isn't possible in pure HTML, but it can easily be achieved using javascript!
Basic example
In the basic example, you have one input field. When you click the add field button an extra input gets added after the last inserted input.
$(document).on('click', '.add_field', function() {
$('<input type="text" class="input" name="field[]" value="">').insertAfter('.input:last');
})
form {
padding: 20px;
}
input {
width: 100%;
margin-bottom: 5px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<input type="text" class="input" name="field[]" value="">
</form>
<button type="button" class="add_field">Add field</button>
Copy value
This example is almost the same as the example above with one difference. It copies the value of the previous input. This is done with help of the JQuery .val() method
$(document).on('click', '.add_field', function() {
let value = $('.input:last').val(); // gets the value of the previous input
$('<input type="text" class="input" name="field[]" value="' + value + '">').insertAfter('.input:last');
})
form {
padding: 20px;
}
input {
width: 100%;
margin-bottom: 5px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<input type="text" class="input" name="field[]" value="">
</form>
<button type="button" class="add_field">Add field</button>
Input groups
You could also copy an entire input group with multiple input fields.
$(document).on('click', '.add_field', function() {
$('<div class="input-group"><input type="email" class="input" name="email[]" value="" placeholder="Your email"><input type="password" class="input" name="password[]" value="" placeholder="Your password"></div>').insertAfter('.input-group:last');
})
form {
padding: 20px;
}
input {
width: 100%;
margin-bottom: 5px;
}
.input-group {
border-bottom: 1px solid gray;
padding: 5px 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<div class="input-group">
<input type="email" class="input" name="email[]" value="" placeholder="Your email">
<input type="password" class="input" name="password[]" value="" placeholder="Your password">
</div>
</form>
<button type="button" class="add_field">Add field</button>
If you need any more examples please leave a comment!

Please try instead,
$(".Addmore").click(function(e) {
e.preventDefault();
// make a separation line
$("#FormItems").append('<hr width="300px">');
// append the input field as your needs
$("#FormItems").append('<input name="user" type="text" placeholder="Username"><br>');
$("#FormItems").append('<input name="email" type="email" placeholder="Email Address">');
});
.formwrapper{
text-align:center;
}
input{
padding:3px;
margin-bottom:5px;
display:inline-block;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="formwrapper">
<form>
<div id="FormItems">
<input name="user" type="text" placeholder="Username"><br>
<input name="email" type="email" placeholder="Email Address">
</div>
<input type="button" value="Add More" class="Addmore">
<input type="submit" value="Submit">
</form>
</div>

In a few lines of js and html you can get that :
<button class="add-input">Add one more input</button>
<form action="." method="GET">
<div class="inputs">
<input type="text" name="text[]">
</div>
<input type="submit" value="submit">
</form>
<script>
const addButton = document.querySelector('button.add-input')
const inputDiv = document.querySelector('form .inputs')
addButton.addEventListener('click', ()=>{ // button to add the inputs
let newInput = document.createElement('input')
newInput.name = 'text[]' // add the name of the input
newInput.type = 'text' // add the type of the input
// you can add other attributes before appeding the node into the html
inputDiv.appendChild(newInput)
})
</script>
and you will have this as a result (I used php to prompt the result)
you can add as many input you want/need.
Next step is just doing some css

I hope this is, what you mean
<form>
<input type="text">
<input type="submit" value="cta">
</form>
<button>Add More</button>
<script>
document.querySelector('button').addEventListener('click', () => {
let field = document.createElement('input');
// change field however you'd like
document.querySelector('form').insertBefore(field, document.querySelector('form:last-child'));
})
</script>

You cannot create this using HTML only, you will need javascript. You could use a frontend framework like react.js to make life easy.
For example in react, you could bind an onclick listener on the button and maintain an array of values as state. Use this array to map value to your input. Whenever user clicks the button, you can then simply push a defaultValue to the array and react will handle the rest.
Import React, { useState } from 'react';
const Page = ()=>{
const [ arr, setArr ] = useState([""]);
const handleAdd = ()=>{
setArr([...arr, ""]);
};
return <form>
{arr.map((elem, index)=><input
onChange={ //"implement logic to update value stored in array" }
value={elem}
key={index} /> )}
<button onClick={()=>handleAdd()}>Add</button>
</form>
}

Using Bootstrap and jquery
Only in html is not possible, you need some on click event to trigger the functionality that may change the html dom.
You can use vanilla javascript as well, here is example using jquery library.
It will dynamically add and remove the element
index.html
<!DOCTYPE html>
<html>
<head>
<title>YDNJSY</title>
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
</head>
<body>
<!-- <h1>Lets learn javascript</h1> -->
<div class="col-xs-12">
<div class="col-md-12">
<h3> Actions</h3>
<div id="field">
<div id="field0">
<!-- Text input-->
<div class="form-group">
<label class="col-md-4 control-label" for="action_id">Action Id</label>
<div class="col-md-5">
<input id="action_id" name="action_id" type="text" placeholder=""
class="form-control input-md">
</div>
</div>
<br><br>
<!-- Text input-->
<div class="form-group">
<label class="col-md-4 control-label" for="action_name">Action Name</label>
<div class="col-md-5">
<input id="action_name" name="action_name" type="text" placeholder=""
class="form-control input-md">
</div>
</div>
<br><br>
</div>
</div>
<!-- Button -->
<div class="form-group">
<div class="col-md-4">
<button id="add-more" name="add-more" class="btn btn-primary">Add More</button>
</div>
</div>
<br><br>
</div>
</div>
</body>
<script src="./index.js"></script>
</html>
index.js
$(document).ready(function () {
var next = 0;
$("#add-more").click(function (e) {
e.preventDefault();
var addto = "#field" + next;
var addRemove = "#field" + (next);
next = next + 1;
var newIn = ' <div id="field' + next + '" name="field' + next + '"><!-- Text input--><div class="form-group"> <label class="col-md-4 control-label" for="action_id">Action Id</label> <div class="col-md-5"> <input id="action_id" name="action_id" type="text" placeholder="" class="form-control input-md"> </div></div><br><br> <!-- Text input--><div class="form-group"> <label class="col-md-4 control-label" for="action_name">Action Name</label> <div class="col-md-5"> <input id="action_name" name="action_name" type="text" placeholder="" class="form-control input-md"> </div></div><br><br></div>';
var newInput = $(newIn);
var removeBtn = '<button id="remove' + (next - 1) + '" class="btn btn-danger remove-me" >Remove</button></div></div><div id="field">';
var removeButton = $(removeBtn);
$(addto).after(newInput);
$(addRemove).after(removeButton);
$("#field" + next).attr('data-source', $(addto).attr('data-source'));
$("#count").val(next);
$('.remove-me').click(function (e) {
e.preventDefault();
var fieldNum = this.id.charAt(this.id.length - 1);
var fieldID = "#field" + fieldNum;
$(this).remove();
$(fieldID).remove();
});
});
});

Creating a store button to add/remove amount and display amount (Very Basic)

Seeking assistance with creating add and subtract buttons within a form to add and remove amount of a line of stock.
Similar to:
I'm new to html and very new to javascript.
function minus(){
var bCount = parseInt(document.calculateCart.count.value);
var count = bCount--;
document.calculateCart.count.value = count;
}
function minus(){
var bCount = parseInt(document.calculateCart.count.value);
var count = bCount++;
document.calculateCart.bCount.value = count;
}
<div class="productForm">
<form name="calculateCart" action="#">
<div class="+-Buttons">
Quantity <br>
<input type="button" value="-" onClick="minus()">
<input type="int" name="count" value=0>
<input type="button" value="+" onClick="add()">
</div>
</form>
</div>

If you want to chane your number using buttons and using text-input, you can change your code to that:
<div class="productForm">
<form name="calculateCart" action="https://titan.csit.rmit.edu.au/~e54061/wp/processing.php">
<div class="+-Buttons">
Quantity <br>
<input type="button" value="-" onClick="minus()">
<input type="number" name="count" value=0>
<input type="button" value="+" onClick="add()">
</div>
</form>
</div>
<script>
function minus(){
document.calculateCart.count.value = --document.calculateCart.count.value;
}
function add(){
document.calculateCart.count.value = ++document.calculateCart.count.value;
}
</script>
In HTML don't exist type of input - int, you need to use number or text.
If you want change value only using the buttons, you can make it like this:
<div class="productForm">
<form name="calculateCart" action="https://titan.csit.rmit.edu.au/~e54061/wp/processing.php">
<div class="+-Buttons">
Quantity <br>
<input type="button" value="-" onClick="minus()">
<span id="your-number">0</span>
<input type="button" value="+" onClick="add()">
</div>
</form>
</div>
<script>
var a = 0;
function minus(){
a -= 1;
document.getElementById('your-number').innerHTML = a;
}
function add(){
a += 1;
document.getElementById('your-number').innerHTML = a;
}
</script>

Your both functions are named 'minus'. One of them (the second one) should be 'add'.

you have s sort of a typo in your code: your function for adding valus is called minus(). So you have two functions with the same name
I believe you are getting the value of count in a wrong way. You should assign an id to the input and use getElementById
working code:
function minus(){
var bCount = document.getElementById('count').value;
bCount--;
document.getElementById('count').value = bCount;
document.getElementById('count');
}
function add(){
var bCount = document.getElementById('count').value;
bCount++;
document.getElementById('count').value = bCount;
document.getElementById('count');
}
<div class="productForm">
<form name="calculateCart" action="https://titan.csit.rmit.edu.au/~e54061/wp/processing.php">
<div class="+-Buttons">
Quantity <br>
<input type="button" value="-" onClick="minus()">
<input type="int" name="count" id="count" value=0>
<input type="button" value="+" onClick="add()">
</div>
</form>
</div>

You need to use document.getElementById in order to get old textbox value.
Please check below code:
function minus(){
var oldVal = parseInt(document.getElementById("myVal").value);
oldVal--;
document.getElementById("myVal").value = oldVal;
}
function add(){
var oldVal = parseInt(document.getElementById("myVal").value);
oldVal++;
document.getElementById("myVal").value = oldVal;
}
<div class="productForm">
<form name="calculateCart" action="https://titan.csit.rmit.edu.au/~e54061/wp/processing.php">
<div class="+-Buttons">
Quantity <br>
<input type="button" value="-" onClick="minus()">
<input type="text" id="myVal" name="count" value="0">
<input type="button" value="+" onClick="add()">
</div>
</form>
</div>

you have two function minus, one of them must be add
if you want use attributre name to select, you need to use something look like:
document.getElementsByName("count")[0].tagName

Keyup not working for dynamically added input-groups

I have already gone through questions available on this topic and have tried everything, but still my keyup function is not working.
$(document).ready(function() {
$(document).on('keyup', '.pollOption', function() {
var empty = false;
$(".pollOption").each(function() {
if ($(this).val() == '') {
empty = true;
}
});
if (empty) {
$("#cpsubmit").attr('disabled', 'disabled');
$("#moreop").attr('disabled', 'disabled');
} else {
$("#cpsubmit").removeAttr('disabled');
$("#moreop").removeAttr('disabled');
}
});
//Keep Track of no. of options on the page
var noOfOptions = 2;
// Function to add input fields (since I may have to delete them I've use bootstrap's input-groups, I guess this is causing issue)
$("#moreop").on('click', function() {
noOfOptions++;
$("#options").append("<div class='input-group pollOption'><input class='form-control' type='text' placeholder='New Option' name='op" + noOfOptions + "'/><span class='input-group-addon'><a href='#' id='removeOption' class='text-danger'>Remove</a></span></div>");
});
// To delete any option (only the dynamically created options can be deleted)
$("#cpform").on('click', '#removeOption', function() {
$(this).parents('.input-group').remove();
noOfOptions--;
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="cpform" method="POST" action="/polls/add">
<div class="form-group">
<label>Title</label>
<input id="title" type="text" placeholder="Ask your question here..." name="title" class="form-control" />
</div>
<div id="options" class="form-group">
<label>Options</label>
<input type="text" placeholder="Option 1" name="op1" class="form-control pollOption" />
<input type="text" placeholder="Option 2" name="op2" class="form-control pollOption" />
</div>
<button id="moreop" type="button" disabled="disabled" class="btn btn-outline-info btn-primary">More Options</button><br/><br/>
<button id="cpsubmit" type="submit" disabled="disabled" class="btn btn-info btn-primary">Submit</button>
</form>
This code works perfectly for the two inputs already in the HTML part.
When I click on the "More Option" button the new field gets added but the "keyup" does not work on it. In fact, when I enter something on the new added inputs then my "More Option" & "Submit" button gets disabled (really do't know why this is happening).

You've to add the class pollOption to the input and not the div in your append :
$("#options").append("<div class='input-group'><input class='pollOption form-control' ...
_____________________________________________________________^^^^^^^^^^
Instead of :
$("#options").append("<div class='input-group pollOption'><input class='form-control' ...
______________________________________________^^^^^^^^^^
Demo:
$(document).ready(function() {
$(document).on('keyup', '.pollOption', function() {
var empty = false;
$(".pollOption").each(function() {
if ($(this).val() == '') {
empty = true;
}
});
if (empty) {
$("#cpsubmit").attr('disabled', 'disabled');
$("#moreop").attr('disabled', 'disabled');
} else {
$("#cpsubmit").removeAttr('disabled');
$("#moreop").removeAttr('disabled');
}
});
//Keep Track of no. of options on the page
var noOfOptions = 2;
// Function to add input fields (since I may have to delete them I've use bootstrap's input-groups, I guess this is causing issue)
$("#moreop").on('click', function() {
noOfOptions++;
$("#options").append("<div class='input-group'><input class='pollOption form-control' type='text' placeholder='New Option' name='op" + noOfOptions + "'/><span class='input-group-addon'><a href='#' id='removeOption' class='text-danger'>Remove</a></span></div>");
$(this).attr('disabled','disaled');
});
// To delete any option (only the dynamically created options can be deleted)
$("#cpform").on('click', '#removeOption', function() {
$(this).parents('.input-group').remove();
noOfOptions--;
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="cpform" method="POST" action="/polls/add">
<div class="form-group">
<label>Title</label>
<input id="title" type="text" placeholder="Ask your question here..." name="title" class="form-control" />
</div>
<div id="options" class="form-group">
<label>Options</label>
<input type="text" placeholder="Option 1" name="op1" class="form-control pollOption" />
<input type="text" placeholder="Option 2" name="op2" class="form-control pollOption" />
</div>
<button id="moreop" type="button" disabled="disabled" class="btn btn-outline-info btn-primary">More Options</button><br/><br/>
<button id="cpsubmit" type="submit" disabled="disabled" class="btn btn-info btn-primary">Submit</button>
</form>

How to check if at least one input is completed?

I have this sample:
link
CODE HTML:
<form class="add-patient">
<fieldset style="display: block;">
<label for="new_exam">New exam</label>
<input type="text" name="new_exam" id="new_exam" value="">
</fieldset>
<fieldset style="display: block;">
<label for="x_ray">X ray</label>
<input type="text" name="x_ray" id="x_ray" value="">
</fieldset>
<input type="button" class="btn btn-submit" onclick="sendForm();" value="Create report">
</form>
CODE JS:
function sendForm() {
var status_form = false;
$(".add-patient input").each(function(){
if($(this).val() == ""){
status_form = true;
}
});
console.log(status_form);
var createdBy = jQuery('#created_by').val();
if( status_form )
{
alert('Fill at least one field');
}else{
alert("now it's ok");
}
}
I want to do a check ... if an input is complete when displaying the message "it; s ok" ... otherwise displaying another message
probably means the code clearly what they want to do.
You can help me with a solution please?
Thanks in advance!

Use .filter to get the length of the input elements having value as ''
Try this:
function sendForm() {
var elem = $(".add-patient input[type='text']");
var count = elem.filter(function() {
return !$(this).val();
}).length;
if (count == elem.length) {
alert('Fill at least one field');
} else {
alert("now it's ok");
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<form class="add-patient">
<fieldset style="display: block;">
<label for="new_exam">New exam</label>
<input type="text" name="new_exam" id="new_exam" value="">
</fieldset>
<fieldset style="display: block;">
<label for="x_ray">X ray</label>
<input type="text" name="x_ray" id="x_ray" value="">
</fieldset>
<input type="button" class="btn btn-submit" onclick="sendForm();" value="Create report">
</form>

jquery next() reference to specific ul's li

I'm working on a multi stage form with the following enabling the next/previous button to transit the form submission from one stage to the other:
$("input[name='next']").click(function(){
var output = validate();
if(output) {
var current = $("#signup-step.active");
var next = current .next(); //Just use .next() here to get the nextSibling of this li
if(next.length>0) {
$("#"+current.attr("id")+"-field").hide();
$("#"+next.attr("id")+"-field").show();
$("input[name='back']").show();
$("input[name='finish']").hide();
$(".active").removeClass("active");
next.addClass("active");
/* if($(".active").attr("id") == $("#signup-step.li").last().attr("id")) {
$("input[name='next']").hide();
$("input[name='finish']").show();
} */
if ( next.is(':last-child') ) {
$("input[name='next']").hide();
$("input[name='finish']").show();
}
}
}
});
$("input[name='back']").click(function(){
var current = $(".active");
var prev = $(".active").prev("#signup-step.li");
if(prev.length>0) {
$("#"+current.attr("id")+"-field").hide();
$("#"+prev.attr("id")+"-field").show();
$("input[name='next']").show();
$("input[name='finish']").hide();
$(".active").removeClass("active");
prev.addClass("active");
/*if($(".active").attr("id") == $("#signup-step.li").first().attr("id")) {
$("input[name='back']").hide();
}
*/
if ( next.is(':last-child') ) {
$("input[name='back']").hide();
}
}
});
By #signup-step:li I'm trying to refer to the li elements in a specific UL element because there two other UL element on the page: 1) UL of main menu, 2) UL of sidebars. Now since the main menu's UL comes before the form itself, the next/back button activate the menu items of the main menu rather the form stages. So being able to specify the UL referred will resolve this.
Kindly advise on the the correct for mat for selecting #signup-step:li in the code above?
Here is the form:
<ul id="signup-step">
<li id="Initiate" class="active">Initiate</li>
<li id="Strive">Strive</li>
<li id="End">End</li>
</ul>
<form name="frmRegistration" id="signup-form" method="post" enctype="multipart/form-data" action="sendemail.php">
<div id="initiate-field">
<label>Name of Organization</label><span id="coyname-error" class="signup-error"></span>
<div><input type="text" name="coyname" id="coyname" class="demoInputBox"/></div>
<label>Certificate of Incorporation No.</label><span id="cacnum-error" class="signup-error"></span>
<div><input type="text" name="cacnum" id="cacnum" class="demoInputBox"/></div>
<label>Registered Office Address</label><span id="regofficeaddy-error" class="signup-error"></span>
<div>
<textarea cols="30" rows="4" name="regofficeaddy" id="regofficeaddy" class="demoInputBox" class = "max10"></textarea>
</div>
<label>Operations Address</label><span id="opsaddy-error" class="signup-error"></span>
<div>
<textarea cols="30" rows="4" name="opsaddy" id="opsaddy" class="demoInputBox" class = "max10"></textarea>
</div>
</div>
<div id="strive-field" style="display:none;">
<label>Location of workshop/facility if different from office address given in the Structure Section:</label><span id="facilityloc-error" class="signup-error"></span>
<div>
<textarea cols="60" rows="8" name="facilityloc" id="facilityloc" class="demoInputBox" class = "max10"></textarea>
</div>
<label>Size of facility (in sq meters):</label><span id="facilitysize-error" class="signup-error"></span>
<div><input type="text" name="facilitysize" id="facilitysize" class="demoInputBox"/></div>
<label>Does your organization own or hire equipment:</label>
<div>
<input type="radio" name="facilityownhire" id="facilityownhire" value="Own"> Own
<input type="radio" name="facilityownhire" id="facilityownhire" value="Hire"> Hire <span id="facilityownhire-error" class="signup-error"></span>
</div>
</div>
<div id="end-field" style="display:none;">
<label>Does your Organization have an HSE Manual?</label>
<div>
<input type="radio" name="hsemanual" id="hsemanual" value="Yes"> Yes
<input type="radio" name="hsemanual" id="hsemanual" value="No"> No <span id="hsemanual-error" class="signup-error"></span>
</div>
<div id="hseevidenceBOX">
<label>If yes, please attach evidence</label><span id="hseevidence-error" class="signup-error"></span>
<div>
<input type="file" name="vendorfile[]" id="hseevidence" class="demoInputBox" />
</div>
</div>
<label>Does your Organization have a Safety Policy?</label>
<div>
<input type="radio" name="orgsafepolicy" id="orgsafepolicy" value="Yes"> Yes
<input type="radio" name="orgsafepolicy" id="orgsafepolicy" value="No"> No <span id="orgsafepolicy-error" class="signup-error"></span>
</div>
</div>
<div>
<input class="btnAction" type="button" name="back" id="back" value="Back" style="display:none;">
<input class="btnAction" type="button" name="next" id="next" value="Next">
<input class="btnAction" type="submit" name="finish" id="finish" value="Send" style="display:none;">
</div>
</form>

Thanks everyone for responding. I solve the problem of conflict with the main menu of the page I change the .active class to .here in the UL HTML, CSS and jquery script. I also reliazed from this fiddle http://jsfiddle.net/GrahamWalters/sgNH4/2/ i gained from another thread that the next("#signup-step.li"); should be next("#signup-step li");
UL HTML
<ul id="signup-step">
<li id="Initiate" class="active">Initiate</li>
<li id="Strive">Strive</li>
<li id="End">End</li>
</ul>
CSS
#signup-step li.here{background-color:#FF0000;}
.here{color:#FFF;}
JQUERY
$("#next").click(function(){
var output = validate();
if(output) {
var current = $(".here");
var next = $(".here").next("#signup-step li");
if(next.length>0) {
$("#"+current.attr("id")+"-field").hide();
$("#"+next.attr("id")+"-field").show();
$("#back").show();
$("#finish").hide();
$(".here").removeClass("here");
next.addClass("here");
if($(".here").attr("id") == $("#signup-step li").last().attr("id")) {
$("#next").hide();
$("#finish").show();
}
}
}
});
$("#back").click(function(){
var current = $(".here");
var prev = $(".here").prev("#signup-step li");
if(prev.length>0) {
$("#"+current.attr("id")+"-field").hide();
$("#"+prev.attr("id")+"-field").show();
$("#next").show();
$("#finish").hide();
$(".here").removeClass("here");
prev.addClass("active");
if($(".here").attr("id") == $("li").first().attr("id")) {
$("#back").hide();
}
}
});