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On change attribut is not initialised in thymeleaf

I have the following problem with javascript integrated into thymeleaf template.
I have the following table with different input fields which are filled up with data from a model.
Furthermore i have for each of this input field a hidden additional input field.
Idea is that when I change not hidden input tag, the hidden ones will receive the new value
<tr th:each=" item : ${products}">
<td>
<input class="form-control" type="text" th:value="${item.product.name}" id="productName" name="productName" />
</td>
<td>
<input class="form-control" type="text" th:value="${{item.product.price}}" id="productPrice" name="productPrice" />
</td>
<td>
<input class="form-control" type="text" th:onchange="substituteOnClick()" th:value="${item.quantity}" id="quantityItem" name="quantityItem" />
</td>
<td>
<input class="form-control" type="text" th:value="${item.MinQuantity}" th:onchange="substituteOnClick()" id="minquantityItem" name="minquantityItem" />
</td>
<td>
<form th:action="#{/deleteWarehouseItem/{id_del}/(id_del=${item.id})}" method="post" role="form" class="ui form">
<button type="submit" class="ui form" name = "itemDel" th:value="${item.id}">Löschen</button>
</form>
</td>
<td>
<form class="ui form" method="post" th:action="#{/updateItem}" >
<input type="hidden" name="productName_mvc" id="productName_mvc" value="0" th:value="${item.product.name}"/>
<input type="hidden" name="productPrice_mvc" id="productPrice_mvc" value="0" th:value="${{item.product.price}}"/>
<input type="hidden" name="quantityItem_mvc" id="quantityItem_mvc" value="0" th:value="${item.quantity}"/>
<input name="minquantityItem_mvc" id="minquantityItem_mvc" value="0" />
<input type="hidden" name="inventoryIdentifier_mvc" id="inventoryIdentifier_mvc" th:value="${item.id}"/>
<button type="submit" class="ui labeled icon button" name = "updateItem" th:text="#{management.updateItem}">
</button>
</form>
</td>
</tr>
Here is my javascript file
function substituteOnClick() {
var pN=document.getElementById("productName").value;
var pP=document.getElementById("productPrice").value;
var qI=document.getElementById("quantityItem").value;
var MqI=document.getElementById("minquantityItem").value;
document.getElementById("productName_mvc").value=pN;
document.getElementById("productPrice_mvc").value=pP;
document.getElementById("quantityItem_mvc").value=qI;
document.getElementById("minquantityItem_mvc").value=MqI;
}
As you see my problem is that for each row I need 2 buttons for different actions, since that I decided that It would be useful just to change values of hidden inputs. It is possible because I use hidden inputs only if I need to update an object and it happens mainly on change event. But my problem is that even if I write anything new in not hidden inputs, it does not influence my hidden ones. I have cheked it by not hidding one of them.
How is it possible to change values in other inputs by changing them firstly in other ones.
Best wishes

first of all, you need to remove these extra brackets from this line
<input class="form-control" type="text" th:value="${{item.product.price}}" id="productPrice" name="productPrice" />
and then in your javascript use console.log() to check whether on onchange event its fetching the change value or not like
console.log("In js function");
console.log(qI);
if you are not getting these values then Instead of onchange event add a button for each input or for all input use a single button inside form and then use the onClick function or onsubmit like this:
<form onsubmit="return substituteOnClick()">
<td>
<input class="form-control" type="text" th:value="${item.product.name}" id="productName" name="productName" />
</td>
<td>
<input class="form-control" type="text" th:value="${item.product.price}" id="productPrice" name="productPrice" />
</td>
<td>
<input class="form-control" type="text" th:value="${item.quantity}" id="quantityItem" name="quantityItem" />
</td>
<td>
<input class="form-control" type="text" th:value="${item.MinQuantity}" id="minquantityItem" name="minquantityItem" />
</td>
<input type="submit" name="Submit" value="Submit"/>
</form>
Let me know if this helps

Trying to react to data on an html form using javascript

I am not quite sure what is going wrong here. I am not seeing values logged to the console upon selecting the "submit" event on the form.
Here is my html:
<div>
<form class="submit-film">
<p class="email">Email</p>
<input class="field" id="email" placeholder="youremail#example.com">
<p class="project_link">Link to your project:</p>
<input class="field" id="link" placeholder="https://vimeo.com/myfilm">
<p class="pw">Password to access film:</p>
<input class="field" id="pw" placeholder="(password to access project)">
<p class="number">How many screeners do you want?</p>
<input class="field" id="screenerAmount" placeholder="8 screeners">
<p class="please">Please attach a questionaire if you have one preparred:</p>
<button class="select">Select file</button>
<p class="length">How many minutes is your project?</p>
<input class="field" id="minutes" placeholder="15 minutes">
<p class="questions">Do you have any additional comments or questions?</p>
<input class="field" id="comments" placeholder="(insert comments/questions here)">
<input type="submit" class="button_type" class="button_type:hover" value="submit">
</form>
</div>
</div>
<script src="wescreen.js"></script>
</body>
</html>
Here is the JavaScript:
const form = document.querySelector('.submit-film');
form.addEventListener('.submit', e=> {
e.preventDefault();
console.log(form.email.value);
console.log(form.link.value);
console.log(form.pw.value);
console.log(form.screenerAmount.value);
console.log(form.minutes.value);
console.log(form.comments.value);
});

just changed the class to the id and used getelementbyid hope this helps
<div>
<form id="submit-film">
<p class="email">Email</p>
<input class="field" id="email" placeholder="youremail#example.com">
<p class="project_link">Link to your project:</p>
<input class="field" id="link" placeholder="https://vimeo.com/myfilm">
<p class="pw">Password to access film:</p>
<input class="field" id="pw" placeholder="(password to access project)">
<p class="number">How many screeners do you want?</p>
<input class="field" id="screenerAmount" placeholder="8 screeners">
<p class="please">Please attach a questionaire if you have one preparred:</p>
<button class="select">Select file</button>
<p class="length">How many minutes is your project?</p>
<input class="field" id="minutes" placeholder="15 minutes">
<p class="questions">Do you have any additional comments or questions?</p>
<input class="field" id="comments" placeholder="(insert comments/questions here)">
<input type="submit" class="button_type" class="button_type:hover" value="submit">
</form>
</div>
</div>
<script>
const form = document.getElementById('submit-film');
console.log(form);
form.addEventListener('click', e => {
e.preventDefault();
console.log(form.email.value);
console.log(form.link.value);
console.log(form.pw.value);
console.log(form.screenerAmount.value);
console.log(form.minutes.value);
console.log(form.comments.value);
}); </script>

All your form elements are missing name attribute.
add them and try, something like this
<input class="field" name="email" id="email" placeholder="youremail#example.com">
console.log(form.email.value);
Refer Here for a sample demo
Edit 1:
Also some issue in this line
form.addEventListener('.submit', e=> {
It should be submit
form.addEventListener('submit', e=> {
Here is working fiddle

Javascript - Object reference returning null even though it shoudn't

I've got this:
var strBox = document.getElementById("txtSTR");
var strModBox = document.getElementById("txtSTRMod");
var refBox = document.getElementById("txtREF");
var refModBox = document.getElementById("txtREFMod");
var fortBox = document.getElementById("txtFOR");
var forModBox = document.getElementById("txtFORMod");
var intBox = document.getElementById("txtINT");
var intModBox = document.getElementById("txtINTMod");
These vars all point to text boxes (read only) in my HTML document.
They rely on populating their .value with the following array:
//0-STR, 1-REF, 2-FOR, 3-INT, 4-JUD, 5-CHA, 6-WIL, 7-TOU
var charAttsAR = ["8","8","8","8","8","8","8","8"];
They are populated with the relevant array entry manually from a function called popDefDat() like this:
strBox.value = charAttsAR[0];
strModBox.value = modSetter(charAttsAR[0]);
refBox.value = charAttsAR[1];
refModBox.value = modSetter(charAttsAR[1]);
fortBox.value = charAttsAR[2];
forModBox.value = modSetter(charAttsAR[2]);
intBox.value = charAttsAR[3];
intModBox.value = modSetter(charAttsAR[3]);
....and so on
My issue is that strBox, strModBox, refBox and refModBox all initialise their data fine. However, at fortBox, it throws "fortBox is null" and I have no idea why. The code is identical, I have my script loaded just before the end of my tag and I also have:
//initialise default data when page loads
window.onload = popDefDat()
Honestly, I'm stuck. Any advice appreciated.
Here's the html too:
<form id="form3" name="form3" method="post" onsubmit="return false" action="">
<p><label></label>
<label for="lblHeadATT"></label>
<input name="lblHeadATT" type="text" disabled="disabled" id="lblHeadATT" value="Points" readonly="readonly" />
<label for="lbHeadMOD"></label>
<input name="lbHeadMOD" type="text" disabled="disabled" id="lbHeadMOD" value="Mod" readonly="readonly" />
<label for="txtPointBuy"></label>
<input name="txtPointBuy" type="text" id="txtPointBuy" readonly="readonly" />
<p>Strength:
<label for="txtSTR"></label>
<input name="txtSTR" type="text" id="txtSTR" readonly="readonly" />
<label for="txtSTRMod"></label>
<input name="txtSTRMod" type="text" id="txtSTRMod" readonly="readonly" />
<input type="button" name="Btn_StrMinus" id="Btn_StrMinus" value="-" onclick="FNCstrSub()" />
<input type="button" name="Btn_StrPlus" id="Btn_StrPlus" value="+" onclick="FNCstrPlus()"/>
<p>Reflex:
<label for="txtREF"></label>
<input name="txtREF" type="text" id="txtREF" readonly="readonly" />
<label for="txtREFMod"></label>
<input name="txtREFMod" type="text" id="txtREFMod" readonly="readonly" />
<input type="button" name="Btn_RefMinus" id="Btn_RefMinus" value="-" onclick="FNCrefSub()" />
<input type="button" name="Btn_RefPlus" id="Btn_RefPlus" value="+" onclick="FNCrefPlus()"/>
<p>Fortitude:
<label for="txtREF"></label>
<input name="txtFOR" type="text" id="txtREF" readonly="readonly" />
<label for="txtFORMod"></label>
<input name="txtFORMod" type="text" id="txtFORMod" readonly="readonly" />
<input type="button" name="Btn_ForMinus" id="Btn_ForMinus" value="-" onclick="FNCforSub()" />
<input type="button" name="Btn_ForPlus" id="Btn_ForPlus" value="+" onclick="FNCforPlus()"/>
</p>
<p>Intellect:
<label for="txtINT"></label>
<input name="txtINT" type="text" id="txtINT" readonly="readonly" />
<label for="txtINTMod"></label>
<input name="txtINTMod" type="text" id="txtINTMod" readonly="readonly" />
<input type="submit" name="Btn_IntMinus" id="Btn_IntMinus" value="-" onclick="FNCintSub()"/>
<input type="submit" name="Btn_IntPlus" id="Btn_IntPlus" value="+"onclick="FNCintPlus()" />
I've yet to write the tags for the other text boxes and buttons as I was hoping to solve this before carrying on.
Thanks

How do I get javascript validation on form input working?

Just trying to do a simple maximum length of fName to not exceed over 10.
I've been looking for online examples. Can't find a common ground in anywhere on any examples I find.
I'm able to submit anything except an empty text (because of required)
<head>
<script type="text/javascript">
var x = document.regoForm.fName.value;
if (x > 1)
{
alert( "too big" );
return false;
}
</script>
</head>
<body>
<form name="regoForm" id="regoForm" method="post">
</p>
<p>
<label for="fName">First Name</label>
<input type="text" required placeholder="John" name="fName"
id="fName"/>
</p>
<p>
<input type="submit" value="submit">
</p>
</form>

I've added an onclick handler to the button, and insert the code into a function.
And if you want to check the length, not the value, then you should use the .length to get the length of the text.
Try this
<head>
<script type="text/javascript">
function checkNameLength() {
if (document.getElementById('fName').value.length > 10) {
alert("too big");
return false;
}
}
</script>
</head>
<body>
<form name="regoForm" id="regoForm" method="post">
<p>
<label for="fName">First Name</label>
<input type="text" required placeholder="John" name="fName" id="fName"/>
</p>
<p>
<input type="submit" value="submit" id="submitBtn" onclick="return checkNameLength()">
</p>
</form>
</body>

You should be able to use built in methods like maxlength
<input type="text" maxlength="10" required placeholder="John" name="fName" id="fName"/>

html/javascript - Trying to validate the form

I did a website and made a form ,and I have done the most of the validation but I am stuck at one. what I am trying to achieve here is when the the submit button of the form is clicked, a alert message show appear on screen saying thanks'customer name' for feed back and you chose 'radiobutton' and your comment was 'textincommentfield'.for one or another reason validation is not working. Any help would be great and thanks in advance , btw I am new to this.
Code: http://jsfiddle.net/92tSw/
HTML:
<title> Contact</title>
<body>
<div class="container">
<div id="wrap">
<div id="logo">
<img class="p" src="images/logo.png" align="left">
</div>
<img class="d" src="images/title.gif" align="middle">
<div id="menu">
<div id="menu2">
<ul>
<li><a href="homepage.html" ><span>Home</span></a></li>
<li><a href="about.html" ><span>About Us</span></a></li>
<li><a href="clubs.html" ><span>Clubs</span></a></li>
<li><a href="shop.html" ><span>Shop</span></a></li>
<li><a href="contact.html" ><span>Contact Us</span></a></li>
</ul>
</div>
</div>
<form>
<fieldset>
<legend style="font-size:20px; padding-top:20px;">Fill in the form Below to contact Us:</legend>
<p><label for="full name">Full Name:</label>
<input id="full name" type="text" size="40" name="customername" placeholder="Type first and last name" autofocus/></p>
<p><label for="Address">Address:</label>
<input type="text" name="address1" placeholder="Address Line 1" size="42%">
<input type="text" name="address2" placeholder="Address Line 2" size="42%">
<p><label for="Address"> </label>
<input type="text" name="city" placeholder="City/Town" size="20%">
<input type="text" name="postcode" placeholder="Post Code" size="20%"></p>
<p><label for="Telephone No.">Telephone Number:</label>
<input type="text" name="Telephone No." maxlenght="12"placeholder=" Enter Telephone No." size="42%"></p>
<p><label for="email">Email:</label>
<input name="email" type="email" size="25" placeholder="youremail#you.com" /></p>
<legend style="font-size:20px;" >Comments</legend>
<p><label for="quantity"> How great is the website?Choose one<em>*</em> :</label>
<input type="radio" name="myRadio" value="VG" >Very Great
<input type="radio" name="myRadio" value="G" >Great
<input type="radio" name="myRadio" value="NVG">Not Very Great
<input type="radio" name="myRadio" value="U" >Useless
<BR>
<BR>
<BR>
<BR>
<p><label for="comment">Your Message:</label>
<textarea cols="35" rows="5" name="comments" Placeholder="eg. please knock on the dooor, ring the bell etc." >
</textarea></p>
</fieldset>
<fieldset>
<input type="checkbox" name="Terms and Condition"value="Terms and Condition" required> Accept Terms and Condition<br>
<input id="bor" type="reset" value="Reset">
<input id="chor" type="submit" name="button" value="Submit" onclick="getMyForm(this.form)" >
</fieldset>
</div>
</div>
CSS:
form{ padding-top:100px; color:White;}
fieldset { background-color:#980000 ; margin: 1%;}
label { float:left; width:20%; text-align:right;}
legend{font-weight:bold;}
.foot {
padding-top:.75pt;
padding-bottom:.75pt;
padding-right:auto;
padding-left:auto;
width:100%;
}
JS:
function getMyForm(frm)
{
var myinfo = getRadioValue(frm.myRadio);
var customername = document.getElementById("customer").value;
var comment = document.getElementById("comment").value;
alert("Dear"+ customername + ",Thank you very much for your feedback.You have rated our site as" + myinfo +"your comment was Very informative website."+ comment +".");
}
function getRadioValue(radioArray){
var i;
for (i = 0; i < radioArray.length; i++){
if (radioArray[i].checked) return radioArray[i].value;}
return "";
}

It may be better to have the event on the form
<form id="form1" onsubmit="return getMyForm(this)">
To prevent the form from actually submitting, you have to return false; from the javascript method.
To submit the form programmatically in JS
frm.submit();
Or
document.getElementById("form1").submit();
Then return true; from the function under the right conditions to allow the submit to complete.
(I noticed you didn't include the action and method attributes on the form. I assumed this was just for the example.)

http://jsfiddle.net/92tSw/2/
Use JQuery if you are new to javascript.. its much more comfortable:
$(document).ready(function() {
$("#yourmockform").submit(function(e) {
var customername = $(this).find('#fullname').val();
var comment = $(this).find('#comment').val();
var myinfo = $(this).find('[name="myRadio"]:checked').attr('value');
alert("Dear"+ customername + ",Thank you very much for your feedback.You have rated our site as" + myinfo +"your comment was Very informative website."+ comment +".");
return false;
});
});