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inputbox change value event looks like not firing in asp.net razor bounded with bootstrap datetimepicker with eonasdan-bootstrap-datetimepicker

I have a textbox bound with datetime picker. What I have to do is on change of value in the text box if another input textbox (which also bound with datetimepicker) is empty I have to fill the value from initial textbox.
I am trying following but no alert coming:
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document)
.off("change", "#FirstDate")
.on("change", "#FirstDate", function(e) {
e.preventDefault();
console.log($(this).val());
});
</script>
<div class="form-group">
<label>First Date</label>
<div class="input-group date">
<input id="FirstDate" name="FirstDate" type="text" class="form-control" asp-for="FirstDate" />
<span class="input-group-addon"></span>
</div>
<span asp-validation-for="FirstDate" class="error"></span>
</div>
<div class="form-group">
<label>Second Date</label>
<div class="input-group date">
<input id="SecondDate" name="SecondDate" type="text" class="form-control" asp-for="SecondDate" />
<span class="input-group-addon"></span>
</div>
<span asp-validation-for="SecondDate" class="error"></span>
</div>

You should always run the script only when it knows what to refer to.
The script part, is executed syncronous and has to come after the divs or needs a trigger where the elements are present at the dom. If it is executed straight at this point, jquery won't find the elements and can't add the listener.
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<div class="form-group">
<label>First Date</label>
<div class="input-group date">
<input id="FirstDate" name="FirstDate" type="text" class="form-control" asp-for="FirstDate" />
<span class="input-group-addon"></span>
</div>
<span asp-validation-for="FirstDate" class="error"></span>
</div>
<div class="form-group">
<label>Second Date</label>
<div class="input-group date">
<input id="SecondDate" name="SecondDate" type="text" class="form-control" asp-for="SecondDate" />
<span class="input-group-addon"></span>
</div>
<span asp-validation-for="SecondDate" class="error"></span>
</div>
<script>
$(document)
.off("change", "#FirstDate")
.on("change", "#FirstDate", function(e) {
e.preventDefault();
console.log($(this).val());
});
</script>

How to show total value of two text box in another box - Javascript

I am new to javascript, I want to get two fees in text boxes and show sum of those two fees in another text box (which is disabled, so can't edit it, just for showing purpose) below is my html form.. result should show when entering in fee1 or fee2 not in submit button. How to do it?
<div class="row">
<div class="col-xl-4">
<div class="form-group">
<label class="gr"><b>Consulation Fees:</b><span class="text-danger">*</span></label><input type="number" class="form-control" id="fee1" name="fee1" required min="0">
</div>
</div>
<div class="col-xl-4">
<div class="form-group">
<label class="gr"><b>Other Charges:</b></label><input type="number" class="form-control" id="fee2" name="fee2" min="0">
</div>
</div>
<div class="col-xl-4">
<div class="form-group">
<label class="gr"><b>Total Fee:</b></label><input type="number" disabled class="form-control" id ="total_fee" name="total_fee" >
</div>
</div>

use input event on fee1 and fee2 and then sum their values and put as value of total_fee.
e.g.
const fee1 = document.getElementById("fee1");
const fee2 = document.getElementById("fee2");
const total_fee = document.getElementById("total_fee");
fee1.addEventListener("input", sum);
fee2.addEventListener("input", sum);
function sum() {
total_fee.value = Number(fee1.value)+Number(fee2.value);
}
see in action
https://jsbin.com/lizunojadi/edit?html,js,output

Basically you listen to input event on both of the controls, summing the values into the other input.
document.querySelectorAll("#fee1, #fee2").forEach(function(elem) {
elem.addEventListener("input", do_sum)
})
function do_sum() {
var total = 0
document.querySelectorAll("#fee1, #fee2").forEach(function(elem) {
total += +elem.value;
})
document.querySelector("#total_fee").value = total
}
<link href="https://cdn.jsdelivr.net/npm/bootstrap#4.6.0/dist/css/bootstrap.min.css" rel="stylesheet">
<div class="container">
<div class="row">
<div class="col-sm-4">
<div class="form-group">
<label class="gr"><b>Consulation Fees:</b><span class="text-danger">*</span></label><input type="number" class="form-control" id="fee1" name="fee1" required min="0">
</div>
</div>
<div class="col-sm-4">
<div class="form-group">
<label class="gr"><b>Other Charges:</b></label><input type="number" class="form-control" id="fee2" name="fee2" min="0">
</div>
</div>
<div class="col-sm-4">
<div class="form-group">
<label class="gr"><b>Total Fee:</b></label><input type="number" disabled class="form-control" id="total_fee" name="total_fee">
</div>
</div>
</div>
</div>

Here is the simple solution for your code,
<div class="row">
<div class="col-xl-4">
<div class="form-group">
<label class="gr"><b>Consulation Fees:</b><span class="text-danger">*</span></label><input type="number" class="form-control" id="fee1" name="fee1" required min="0" value="0">
</div>
</div>
<div class="col-xl-4">
<div class="form-group">
<label class="gr"><b>Other Charges:</b></label><input type="number" class="form-control" id="fee2" name="fee2" min="0" value="0">
</div>
</div>
<div class="col-xl-4">
<div class="form-group">
<label class="gr"><b>Total Fee:</b></label><input type="number" disabled class="form-control" id ="total_fee" name="total_fee" >
</div>
</div>
Here in the HTML code default value="0",
Now in Javascript,
const fee1 = document.getElementById('fee1');
const fee2 = document.getElementById('fee2');
const totalFee = document.getElementById('total_fee');
function doSum() {
const fee1Value = parseInt(fee1.value);
const fee2Value = parseInt(fee2.value);
const totalFeeValue = fee1Value + fee2Value;
totalFee.value = totalFeeValue;
}
fee1.addEventListener('input', doSum);
fee2.addEventListener('input', doSum);
doSum() function is executing oninput

Why am I getting null values when submitting a form after editing some values with JS?

I have a form with some inputs that are filled from the result of an AJAX request. When I submit the form I get only null on the back-end. I tried to submit the values without editing it and it works
this is my java script code
editPayment = function() {
if ($('#entrytransId').val() != '') {
if ($('#entryReceiptTypesselect').val() == "1") {
$.ajax({
type: "GET",
url: "#Url.Action("GetInvoiceNumber", "Payment")",
data: {transId: $('#entrytransId').val()},
success: function(response) {
if (response.invNo == 0) {
window.location.reload();
} else {
$('#reciptNo').val(response.invNo);
$('#enteryAmt').val(response.Amt);
$('#entrytransId').attr("disabled", "true");
$('#enteryhide').show(500);
}
},
error: function(reponse) {
window.location.reload();
}
});
}
}
This is Exactly My HTML Form with inputs I have tried more times and its failures
but when I deleted the javascript function and fill the data manually its works
<form action="/Payment/EditPayment" id="MF" method="post">
<div class="row">
<div class="col-md-2">
<label class="form-control">Receipt Type</label>
</div>
<div class="col-md-8">
<select class="form-control" id="entryReceiptTypesselect"
name="entryReceiptTypes" required="true"><option value="">-Choose</option>
<option value="1">MoF</option>
<option value="2">Zakah</option>
<option value="3">Tax</option>
<option value="4">Other Taxs</option>
<option value="5">M & S</option>
</select>
</div>
</div>
<div class="row">
<div class="col-md-2">
<label class="form-control">Trans Id</label>
</div>
<div class="col-md-3">
<input required="" type="number" class="form-control" id="entrytransId" name="entrytransId">
</div>
<div class="col-md-2" hidden="" id="btnHidden">
<button type="button" class="btn btn-primary legitRipple" onclick="editPayment()">check</button>
</div>
</div>
<div class="row">
<div class="row">
<div class="col-md-2">
<label class="form-control" id="lblinvoice">reciptNo</label>
</div>
<div class="col-md-4">
<input required="" type="number" name="reciptNo" class="form-control" id="reciptNo">
</div>
</div>
<div class="row" hidden="" id="enteryhide">
<div class="col-md-2">
<label class="form-control">enteryAmt</label>
</div>
<div class="col-md-4">
<input required="" type="number" value="0" name="enteryAmt" class="form-control" id="enteryAmt">
</div>
</div>
<div class="row">
<div class="col-md-2">
<label class="form-control">E15 userName</label>
</div>
<div class="col-md-8">
<input required="" type="text" class="form-control" id="userName" name="userName">
</div>
</div>
<div class="row">
<div class="col-md-2">
<label class="form-control">password</label>
</div>
<div class="col-md-8">
<input required="" type="password" class="form-control" id="password" name="password">
</div>
</div>
</div>
<br>
<br>
<br>
<br>
<div class="row">
<div class="col-md-4 col-md-offset-4">
<input type="submit" value="submit" class="btn btn-block btn-success legitRipple" id="enterysubmit">
</div>
</div>
</form>

The issue is not with setting the values via javascript/jquery, but specifically with setting the inputs to disabled.
$('#entrytransId').attr("disabled", "true");
when an input is set to disabled, it is not included (it is excluded) from the form's POST, so will appear as null in the server-side code.
You can:
- not set them to disabled (will affect your UX)
- enable them just before POST (icky)
- use hidden fields
MVC does this for checkboxes, so you can copy that idea here:
<input type='text' name='entryid' />
<input type='hidden' name='entryid' />
POST uses the input's name field, not its id, so it's ok to have multiple inputs with the same name.
POST will then use the first input that is not disabled (so don't put the hidden one first...)
Then just update the jquery to apply the value to both inputs (if you also want it shown in the UI) rather than by id, eg:
$("name[entryid]").each(function() { $(this).val(newvalue); });
(other ways to set this may be better, not checked if .val() will apply to all, likely only applies to the first)

The proplem was on $('#entrytransId').attr("disabled", "true");
i have another function onselectChange() is disabled all inputs , i tried $('#entrytransId').attr("disabled", "true"); and its works well

How to validate radio buttons with a input field inside it?

So I have these radio buttons that a user can select and then I need a text input inside of it. How can I validate these inputs so that they are required to select a radio option, and if it is one of the first two, make sure they fill out the text inputs? I assume I need to use the jquery.validator.addMethod somehow, but i'm really lost on what I need to do. I'd really appreciate some help. Thanks so much!
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.1/additional-methods.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.1/jquery.validate.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<div id="itemPricing" class="clearfix">
<div class="row">
<div class="col-sm-12" form-group>
<label for="itemPricing" class="required">Pricing</label>
<span id="helpBlock" class="help-block">Select how you want pricing to display on your website.</span>
</div>
<!-- Regular Price -->
<div class="col-sm-12 form-group">
<div class="form-inline radio-input-group">
<div class="radio">
<input type="radio" class="height-initial" name="pricingOptions" id="regularPrice" value="">
<label for="regularPrice" class="required">Regular Price</label>
</div>
<div class="input-group">
<span class="input-group-addon">$</span>
<input type="text" class="form-control money" id="productPrice" name="productPrice">
</div>
</div>
<div class="form-inline radio-input-group">
<div class="radio">
<input type="radio" class="height-initial" name="pricingOptions" id="salePrice" value="">
<label for="salePrice" class="required">Sale Price</label>
</div>
<div class="input-group">
<span class="input-group-addon">$</span>
<input type="text" class="form-control money" id="productPrice" name="productPrice">
</div>
</div>
<div class="form-inline radio-input-group">
<div class="radio">
<input type="radio" class="height-initial" name="pricingOptions" id="emailPrice" value="">
<label for="emailPrice" class="required">Email for Price</label>
</div>
</div>
</div>
</div>
</div>
<!-- end itemPricing -->
<button type="submit" class="btn btn-success save ladda-button" data-style="zoom-in">Save</button>

Yes, skipping server side validation is not an option, but you get a better user experience if you also validate on the client side too. Waiting for the round trip to the server before the user becomes aware of the problem is a sure way to piss the user off. The radio buttons can have onChange handlers that check to see if the button is selected and set the required status of the textbox accordingly.

Show/Hide div using bootstrap checkbox - require inputs to be entered only if checkbox is checked

Ok, I've been having a really weird problem using a checkbox which collapses a hidden div using bootstrap.
if I have data-toggle="collapse" in the checkbox input attribute section, the Div Collapses but requires that every single one of the inputs inside it be filled out.
If data-toggle="collapse" is not there, the hidden div doesn't collapse, and if the checkbox is checked it requires the inputs to be entered and if it's left unchecked I can submit the form without the inputs being entered. (desired action, but the div doesn't hide or show when the checkbox is checked)
How do I hide/show the div when the checkbox is unchecked/checked AND only require the inputs if the box is checked?
I'm using this as the HTML:
<div class="col-md-1">
<input type="checkbox" onclick="ChangeShip()" href="#moreabout" data-toggle="collapse" aria-expanded="false" aria-controls="moreabout" class="form-control" id="chShipAdd" name="chShipAdd" value="no">
</div>
<label for="chShipAdd" class="col-md-3 control-label">Shipping Information?</label>
<div id="shipadddiv" style="visibility: hidden;">
<div class="collapse" id="moreabout" >
<div class="form-group">
<div class="col-md-12">
<br>
<input id="sStreet" name="sStreet" type="text" placeholder="Street Name (required)" class="form-control shipClass" required>
</div>
</div>
<div class="form-group">
<div class="col-md-4">
<input id="sCity" name="sCity" type="text" placeholder="City (required)" required class="form-control shipClass">
</div>
<div class="col-md-4">
<input id="sState" name="sState" type="text" placeholder="State (required)" required class="form-control shipClass">
</div>
<div class="hidden-lg hidden-md"> </div>
<div class="col-md-4">
<input id="sZipcode" name="sZipcode" type="text" placeholder="Zip (required)" required class="form-control shipClass">
</div>
</div>
</div>
</div>
and the javascript:
function ChangeShip() {
if (!(document.getElementById('chShipAdd').checked)) {
document.getElementById('shipadddiv').style.visibility="hidden";
$(".shipClass").prop("disabled",true);
}
else {
document.getElementById('shipadddiv').style.visibility="visible";
$(".shipClass").prop("disabled",false);
}
}
Any solution that WORKS will be acceptable. I've bashed my brain all day trying to do this simple action. I've tried .prop .attribute .setAttribute .removeAttribute, and much much more.
Any Advice?

You can use jquery to solve this quickly. You can wrap your inputs for change ship and give it and id. And let jquery do the rest.
var form = $('#myForm'),
checkbox = $('#changeShip'),
chShipBlock = $('#changeShipInputs');
chShipBlock.hide();
checkbox.on('click', function() {
if($(this).is(':checked')) {
chShipBlock.show();
chShipBlock.find('input').attr('required', true);
} else {
chShipBlock.hide();
chShipBlock.find('input').attr('required', false);
}
});
See this jsfiddle for your problem. This should help you.

your click event will toggle the display and the disabled, but when the form is loaded you will have hidden content that is not disabled.
simply call the function on document.ready
function ChangeShip() {
var show = $('#chShipAdd').prop('checked');
$('#shipadddiv').toggle(show);
$("#shipadddiv .shipClass").prop("disabled", !show);
}
$(ChangeShip); // call on document.ready
or simply add the disabled attribute to those elements so that the initial form state is valid
If the [required] attribute is still triggered on a [disabled] element you could juggle the attribute value
function ChangeShip() {
var show = $('#chShipAdd').prop('checked');
$('#shipadddiv').toggle(show);
$("#shipadddiv .shipClass").each(function(){
if (!('_required' in this))
this._required = this.required;
this.disabled = !show;
this.required = (show) ? this._required : false;
});
}

Try to do this :
HTML :
<div class="col-md-1">
<input type="checkbox" onclick="ChangeShip()" href="#moreabout" data-toggle="collapse" aria-expanded="false" aria-controls="moreabout" class="form-control" id="chShipAdd" name="chShipAdd" value="no">
</div>
<label for="chShipAdd" class="col-md-3 control-label">Shipping Information?</label>
<div id="shipadddiv" style="visibility: hidden;">
<div class="collapse" id="moreabout" >
<div class="form-group">
<div class="col-md-12">
<br>
<input id="sStreet" name="sStreet" type="text" placeholder="Street Name (required)" class="form-control shipClass" required>
</div>
</div>
<div class="form-group">
<div class="col-md-4">
<input id="sCity" name="sCity" type="text" placeholder="City (required)" required class="form-control shipClass">
</div>
<div class="col-md-4">
<input id="sState" name="sState" type="text" placeholder="State (required)" required class="form-control shipClass">
</div>
<div class="hidden-lg hidden-md"> </div>
<div class="col-md-4">
<input id="sZipcode" name="sZipcode" type="text" placeholder="Zip (required)" required class="form-control shipClass">
</div>
</div>
</div>
</div>
JQUERY :
$('#chShipAdd').change(function() {
if ($('#chShipAdd').prop('checked')) {
$('#shipadddiv').show();
} else {
$('#shipadddiv').hide();
}
});