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How Can I Get Values from Dialog in HTML and JavaScript, and Display it in PHP page

I have a HTML form that contains dialog, and the dialog contains inputs
When user complete dialog inputs and click send, the values appear in the same page of form in divusing JavaScript.
Then, when user complete other fields in form and click submit, user goes to another php page than contains entered values of all fields.
I want to get the values of dialog to php page
My form code:
<form id="form" action="message.php" method="POST" >
<div class="container" id="executive-bodies-information">
<!-- details-of-partners Dialog -->
<dialog id="details-of-partners">
<h2>بيانات الشركاء ، الملاك المستفيدون النهائيون ، المالكين المستفيدين</h2>
<label for="details-of-partners-name">الاسم</label>
<input type="text" id="details-of-partners-name"
name="details-of-partners-name" placeholder="الاسم" >
<label for="details-of-partners-date-of-expiry">تاريخ الانتهاء</label>
<input type="date" id="details-of-partners-date-of-expiry"
name="details-of-partners-date-of-expiry" placeholder="تاريخ الانتهاء">
<button button type="button" id="details-of-partners-send" >إرسال</button>
<button button type="button" id="details-of-partners-cancel"
onclick="closeDialog('details-of-partners')">إلغاء</button>
</dialog>
<!-- END details-of-partners Dialog -->
<div>
<button class="btn-add" type="button" onclick="showDialog('details-of-partners')">＋ جديد</button>
<div id="details-of-partners-container"></div>
</div>
</div>
<label for="preferred-language">اللغة المفضلة</label>
<select name="preferred-language" id="preferred-language" required>
<option value="" disabled selected>اختر</option>
<option value="english">الانجليزية</option>
<option value="arabic">العربية</option>
</select>
<div class="center">
<button type="submit" id="submit"><h1>إرسـال</h1></button>
</div>
</form>
This button is clicked to show dialog:
This is the dialog:
Here is the result of dialog, while user enter new dialog with new values, a div is added with these new valaues in form page:
My JavaScript code to enable values to display in form page:
<script>
function showDialog(id) {
var dialog= document.getElementById(id);
dialog.show();
}
function closeDialog(id){
var dialog= document.getElementById(id);
dialog.close()
}
document.getElementById("details-of-partners-send").addEventListener('click', function(){
var name= document.getElementById("details-of-partners-name").value;
var date_of_expiry= document.getElementById("details-of-partners-date-of-expiry").value;
document.getElementById("details-of-partners-container").innerHTML+=
`
<div class="border" >
<div class="details-box">
<span>الاسم:  </span>
<span>${ name}</span>
</div>
<div class="details-box">
<span>تاريخ الانتهاء:  </span>
<span> ${date_of_expiry}</span>
</div>
</div>
`;
closeDialog("details-of-partners");
})
</script>
An example of another code in message.php where I collect all values of form and echo values in it:
<span for="preferred-language">اللغة المفضلة: </span>
<span><?php
if(isset($_POST['preferred-language'])){
$lang= $_POST['preferred-language'];
if($lang=="english"){
echo "الانجليزية";
}else{
echo "العربية";
}
}
?> </span>
It will look like this:
And this is What I need, collect value from dialog using Javascript, then appears these values of div in php page
Sorry for taking long time to explain it in details

i suggest adding a hidden input where you can store the values from the dialogue so they can be submitted with the form, and since there can be multiple dialogues, you need an increment variable.
Before submit button : <input type="hidden" name="increment" id="increment" />
Outside of the onclick event: var incrm = 1
document.getElementById("details-of-partners-container").innerHTML+=
...
<input type="hidden" name="name${incrm}" value="${name}" /> //close .innerHTML
document.getElementById("increment").value = incrm;
incrm++;

Validate a form element without/before submitting the form with JavaScript

I have an HTML form that has its elements displayed in various Bootstrap modals. The first modal has a text box input that and a "Next" button to open the next modal. When the "next" button is pressed. I want to check if the text box is empty, and trigger a validation message. The form does not get submitted until the very end. Everything I've tried has not worked so far.
Javascript/jQuery code
$("#add_assistant_next").click(function () {
var textInput = document.getElementById('add_assistant_user');
var text = textInput.value;
if (text === "") {
textInput.setCustomValidity('Please fill out this field.');
textInput.checkValidity();
var form = $('#form_add_assistant');
form.find(':submit').click();
} else {
textInput.setCustomValidity('');
}
});
HTML
<form name="add_assistant" method="post" id="form_add_assistant">
<div class="modal-body">
<div class="step">
<span class="fas fa-arrow-right choose-arrow mr-1"></span>1. Choose a user to add
</div>
<div class="pl-3 pt-1">
<div>
<input type="text" id="add_assistant_user" name="add_assistant[user]" required="required" placeholder="UCInetID or UCI email address" class="mr-0 form-control" />
<button type="button" id="add_assistant_next" name="add_assistant[next]" data-toggle="modal" data-target="#add-user-modal" class="btn btn-outline-secondary btn">Look up user</button>
</div>
<input type="hidden" name="user_search_route" value="/courseSpace/20900/listAssistantEnrollment">
</div>
</div>
... form continues in other modals

Your JS code is probably fighting with Bootstrap for control of that button. To get around that, and have your validation, you could try modifying your code to have a middle step / temporary button to help with validation first before actually submitting. So something like this:
Javascript/jQuery code
$("#my_temp_button").click(function () {
var textInput = document.getElementById('add_assistant_user');
var text = textInput.value;
// Might also want to handle null and undefined cases?
if (text === "" || text === undefined || text === null) {
// I'm assuming if it's empty, it doesn't pass validation,
// so we just display this warning and wait for the user to fix it:
textInput.setCustomValidity('Please fill out this field.');
} else {
// it's not empty so validate:
if (textInput.checkValidity()) {
// it passed validation, so ok to submit.
// call the real button:
$('#add_assistant_next').click();
// do you need this?
var form = $('#form_add_assistant');
form.find(':submit').click();
} else {
// it failed validation, so display another error?
textInput.setCustomValidity('Try again.');
}
}
});
HTML:
<form name="add_assistant" method="post" id="form_add_assistant">
<div class="modal-body">
<div class="step">
<span class="fas fa-arrow-right choose-arrow mr-1"></span>1. Choose a user to add
</div>
<div class="pl-3 pt-1">
<div>
<input type="text" id="add_assistant_user" name="add_assistant[user]" required="required" placeholder="UCInetID or UCI email address" class="mr-0 form-control" />
<!-- Feel free to change the id name. This is the button the user sees. It's only purpose is to give your function above full control to it and prevent Bootstrap from touching it and jumping to the next modal without having the user fix the validation failure first: -->
<button type="button" id="my_temp_button" class="btn btn-outline-secondary btn">Look up user</button>
<!-- Hide the real button from the user: -->
<div style="display:none">
<button type="button" id="add_assistant_next" name="add_assistant[next]" data-toggle="modal" data-target="#add-user-modal" class="btn btn-outline-secondary btn">Look up user</button>
</div>
</div>
<input type="hidden" name="user_search_route" value="/courseSpace/20900/listAssistantEnrollment">
</div>
</div>
...

Have you tried adding a trap for the submit event itself?
$('#form_add_assistant').submit(function(evt){
//do your validation here
if (validation fails){
return false; // OR, alternatively, `evt.preventDefault()`
}
//form submission will continue if not returned false
});
References:
https://api.jquery.com/submit/
How to conduct manual form validation via jQuery .submit()

React form with multiple buttons - how to choose one to handle onSubmit event?

Let's say I have this HTML:
<div id="container"></div>
<p>Output: <span id="output"></span></p>
and this JS:
function otherAction(e) {
document.getElementById('output').innerHTML = 'otherAction';
e.preventDefault();
}
function submit(e) {
document.getElementById('output').innerHTML = 'submit';
e.preventDefault();
}
ReactDOM.render(
<form onSubmit={submit}>
<input type="text" defaultValue="foo" />
<button onClick={otherAction}>Other Action</button>
<button type="submit">Submit</button>
</form>,
document.getElementById('container')
);
Actually, let's not just say it, let's put it in a JSFiddle example. What I want to happen is that:
Clicking the "Other Action" button triggers the otherAction function (it does!)
Clicking the "Submit" button triggers the submit function (it does!)
Putting your cursor in the text box and pressing enter triggers the submit function (this does not work currently!)
In #3, what happens instead is that otherAction gets triggered. How can I change that?

If you set the first button to type="button" (i.e. provide a type for each button) it should work.
<button type="button" onClick={otherAction}>Other Action</button>
https://jsfiddle.net/L0urqamz/3/

You should provide types for all buttons, otherwise it won't work:
<form onSubmit={handleSubmit}>
// form content
<button type="button" onClick={someButtonEvent}>DO STH</button>
<button type="submit">SUBMIT</button>
</form>

pass values from separate divs into a javascript function

I have a form that has three separate divs within it.
<form method="post">
<div id = "f1">
<div class="label">Value 1:</div>
<input type="text" name="name"/>
<button id = "next1" type="button" onclick="checkValue()">Next</button>
</div>
<div id ="f2">
<div class="label">Value 2:</div><br>
<input type="text" name="name"/>
<button type="button" onclick="checkValue()">Next</button><br>
</div>
<div id ="f3">
<div class="label">Value 3:</div><br>
<input type="text" name="name"/>
<button type="button" onclick="checkValue()">Next</button><br>
</div>
</div>
</form>
In my javascript function. I have a fadein and fadeout attached to each div when the next button is pressed. When the "next1" button is pressed the first div will be faded out and the second div will fade in. I want to check the values inputted in the first div when the user presses the first next button. I know how to do this if i just passed in the whole form into my javascript function on the final submit button, but I would like to know how to do this after each next button is pressed.
I also will have more than one value in each of the divs (f1, f2, f3) but for simplicity I only included one value.
EDIT*: further explaintaion
If i did this by passing in the form into checkValue. I could just do an onsubmit = "checkValue()". And then in my JS file, I would just include checkValue(form) as its parameter. If i want to do a check after every single button is pressed, I am not sure how to do this or what to pass in as its parameter.

Simple mock up hopefully to get you one your way.
Fiddle: http://jsfiddle.net/AtheistP3ace/krr3tgLx/1/
HTML:
<form method="post">
<div id="f1" style="display: block;">
<div class="label">Value 1:</div>
<input type="text" name="name" />
<button id="next1" type="button" onclick="checkValue(this)">Next</button>
</div>
<div id="f2">
<div class="label">Value 2:</div>
<br>
<input type="text" name="name" />
<button type="button" onclick="checkValue(this)">Next</button>
<br>
</div>
<div id="f3">
<div class="label">Value 3:</div>
<br>
<input type="text" name="name" />
<button type="button" onclick="checkValue(this)">Next</button>
<br>
</div>
</div>
</form>
JS:
function checkValue (button) {
// Finds the sibling input of the button
var input = $(button).siblings('input');
// Gets input value
var value = input.val();
// Stops showing next div if no value
if (value == '') {
return false;
}
else {
// Finds the parent div holding button and input
var div = $(button).closest('div');
// Fades out current div
div.fadeOut();
// Gets next div and fades it in
div.next().fadeIn();
}
}
CSS:
form > div {
display: none;
}

From my assumptions this is what you are looking for :
Multipart form handler
Basically I wired up each button with a class
<button id = "next1" type="button" class="check-btn">Next</button>
Then I used Jquery to get all those buttons and find the parent div (based on your structure) and then get all the child inputs (can include selects etc). From here you can continue to tweak to perform a check on each type of input etc.
$(document).ready(function(){
$('.check-btn').on('click',function(){
var parent = $(this).parent('div');
var elems = parent.find('input');
alert(elems.length);
//DO checks here for each element
});
});

change input text value and add new link

on this page, I'm want to change "sold out" on the button to "coming soon", and then have this link to a new page.
how would i do this?
HTML
<input type="submit" value="Sold Out" id="add" class="btn add-to-cart disabled" disabled="disabled" style="opacity: 0.5;">
Some Jquery
$(e.target).find(selectors.SUBMIT_ADD_TO_CART).attr('disabled', true).addClass('disabled');

Well, change the value to coming soon.
<input type="submit" value="Coming Soon!" id="add" class="btn add-to-cart disabled" disabled="disabled" style="opacity: 0.5;">
Next in your form change the action.
<form action="NEW PAGE HERE">
Did you mean you want to do this with Jquery..?

$('.add-to-cart').on('click', function(e){
var $this = $(this);
if ($this.is(':disabled')) {
$this.prop('disabled', false);
$this.val('Coming Soon!');
e.preventDefault();
} else {
/* do logic to go to other page if needed */
}
});

to change value for submit input
$('#add').val('Coming soon!');
or
$('#add').attr('value','Coming Soon!');