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How to disable all input when checkbox is checked on load with jquery

I want the input each tr disabled if its checkbox is unchecked - on page load. As I understand, I have to call a function to check if the checkbox was checked. But as my code below, it's not working.
$(function() {
fn_chkBox('.form-check-input'); //see if checked on load
function fn_chkBox() {
if ($(this).is(':checked')) {
$(this).closest("tr").find("input.form-control").prop("disabled", false);
} else {
$(this).closest("tr").find("input.form-control").prop("disabled", true);
}
}
});
$(".form-check-input").change(function() {
if ($(this).is(':checked')) {
$(this).closest("tr").find("input.form-control").prop("disabled", false);
} else { //unchecked
$(this).closest("tr").find("input.form-control").prop("disabled", true);
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<th>Day</th>
<th>Fish</th>
<th>Crab</th>
<th>Shrimp</th>
<th>Squid</th>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="mon" value="1" checked/> Mon</label></td>
<td><input type="text" class="form-control" name="mon[1]" /></td>
<td><input type="text" class="form-control" name="mon[2]" /></td>
<td><input type="text" class="form-control" name="mon[3]" /></td>
<td><input type="text" class="form-control" name="mon[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="tue" value="1" /> Tue</label></td>
<td><input type="text" class="form-control" name="tue[1]" /></td>
<td><input type="text" class="form-control" name="tue[2]" /></td>
<td><input type="text" class="form-control" name="tue[3]" /></td>
<td><input type="text" class="form-control" name="tue[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="wed" value="1" /> Wed</label></td>
<td><input type="text" class="form-control" name="wed[1]" /></td>
<td><input type="text" class="form-control" name="wed[2]" /></td>
<td><input type="text" class="form-control" name="wed[3]" /></td>
<td><input type="text" class="form-control" name="wed[4]" /></td>
</tr>
</table>
I want all the input in each row tr disabled when load if its checkbox is empty.

You can use the .form-check-input:not(:checked) selector to select all checkboxes that are not checked.
$(function() {
$('.form-check-input:not(:checked)').closest("tr").find("input.form-control").prop("disabled", true);
});
$(".form-check-input").change(function() {
if ($(this).is(':checked')) {
$(this).closest("tr").find("input.form-control").prop("disabled", false);
} else { //unchecked
$(this).closest("tr").find("input.form-control").prop("disabled", true);
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<th>Day</th>
<th>Fish</th>
<th>Crab</th>
<th>Shrimp</th>
<th>Squid</th>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="mon" value="1" checked/> Mon</label></td>
<td><input type="text" class="form-control" name="mon[1]" /></td>
<td><input type="text" class="form-control" name="mon[2]" /></td>
<td><input type="text" class="form-control" name="mon[3]" /></td>
<td><input type="text" class="form-control" name="mon[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="tue" value="1" /> Tue</label></td>
<td><input type="text" class="form-control" name="tue[1]" /></td>
<td><input type="text" class="form-control" name="tue[2]" /></td>
<td><input type="text" class="form-control" name="tue[3]" /></td>
<td><input type="text" class="form-control" name="tue[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="wed" value="1" /> Wed</label></td>
<td><input type="text" class="form-control" name="wed[1]" /></td>
<td><input type="text" class="form-control" name="wed[2]" /></td>
<td><input type="text" class="form-control" name="wed[3]" /></td>
<td><input type="text" class="form-control" name="wed[4]" /></td>
</tr>
</table>

To do what you require you can simply trigger() your change event handler on the checkboxes when the page loads.
Two other things to note here. Firstly, the logic there can be simplified by providing the inverse checked property state to the prop('disabled') call. Secondly, be careful when placing your event handlers outside document.ready. If you've put the jQuery code in the head of the page you encounter issues with the event not being bound.
With all that said, try this:
jQuery($ => {
$(".form-check-input").on('change', e => {
$(e.target).closest('tr').find('input.form-control').prop('disabled', !e.target.checked);
}).trigger('change');
});
.form-control { width: 50px; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<th>Day</th>
<th>Fish</th>
<th>Crab</th>
<th>Shrimp</th>
<th>Squid</th>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="mon" value="1" checked/> Mon</label></td>
<td><input type="text" class="form-control" name="mon[1]" /></td>
<td><input type="text" class="form-control" name="mon[2]" /></td>
<td><input type="text" class="form-control" name="mon[3]" /></td>
<td><input type="text" class="form-control" name="mon[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="tue" value="1" /> Tue</label></td>
<td><input type="text" class="form-control" name="tue[1]" /></td>
<td><input type="text" class="form-control" name="tue[2]" /></td>
<td><input type="text" class="form-control" name="tue[3]" /></td>
<td><input type="text" class="form-control" name="tue[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="wed" value="1" /> Wed</label></td>
<td><input type="text" class="form-control" name="wed[1]" /></td>
<td><input type="text" class="form-control" name="wed[2]" /></td>
<td><input type="text" class="form-control" name="wed[3]" /></td>
<td><input type="text" class="form-control" name="wed[4]" /></td>
</tr>
</table>

You can leverage your existing function and just trigger a 'change' event on load. You can also shorten your function by setting disabled to !$(this).is(':checked')
$(function() {
$('input[type=checkbox]').trigger('change')
});
$(".form-check-input").change(function() {
$(this).closest("tr").find("input.form-control").prop("disabled", !$(this).is(':checked'));
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<th>Day</th>
<th>Fish</th>
<th>Crab</th>
<th>Shrimp</th>
<th>Squid</th>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="mon" value="1" checked/> Mon</label></td>
<td><input type="text" class="form-control" name="mon[1]" /></td>
<td><input type="text" class="form-control" name="mon[2]" /></td>
<td><input type="text" class="form-control" name="mon[3]" /></td>
<td><input type="text" class="form-control" name="mon[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="tue" value="1" /> Tue</label></td>
<td><input type="text" class="form-control" name="tue[1]" /></td>
<td><input type="text" class="form-control" name="tue[2]" /></td>
<td><input type="text" class="form-control" name="tue[3]" /></td>
<td><input type="text" class="form-control" name="tue[4]" /></td>
</tr>
<tr>
<td><label><input type="checkbox" class="form-check-input" name="wed" value="1" /> Wed</label></td>
<td><input type="text" class="form-control" name="wed[1]" /></td>
<td><input type="text" class="form-control" name="wed[2]" /></td>
<td><input type="text" class="form-control" name="wed[3]" /></td>
<td><input type="text" class="form-control" name="wed[4]" /></td>
</tr>
</table>

Javascript calculated field disappearing when being submitted to mysql

I have a Client Data Entry Form, it is quite large but works great. Except for one problem I added a script to calculate the total of up to 5 fields Max. The script works, it does the calculation and the total appears. When I submit the form the data isn't being submitted to mysql.
Here is the script:
<script>
var calculateForm = function () {
document.getElementById("total_paid").value = (Number(document.getElementById("amount1").value) + Number(document.getElementById("amount2").value) + Number(document.getElementById("amount3").value) + Number(document.getElementById("amount4").value) + Number(document.getElementById("amount5").value));
};
</script>
Here is part of the form:
<div class="rent_own_info">
<fieldset name="rent_own">
<legend>Rent / Own</legend>
<table><tbody>
<tr>
<td>Address</td>
<td>Postal Code</td>
<td>Months</td>
<td>Amount</td>
<td>Landlord / Township</td>
</tr>
<tr>
<td><input type="text" name="address1" id="address1"></td>
<td><input type="text" name="pcode1" id="pcode1" size="10"></td>
<td><input type="text" name="months1" id="months1" size="10"></td>
<td><input type="text" name="amount1" id="amount1" value="" onblur="calculateForm();" size="10"></td>
<td><input type="text" name="paid1" id="paid1"></td>
</tr>
<tr>
<td><input type="text" name="address2" id="address2"></td>
<td><input type="text" name="pcode2" id="pcode2" size="10"></td>
<td><input type="text" name="months2" id="months2" size="10"></td>
<td><input type="text" name="amount2" id="amount2" value="" onblur="calculateForm();" size="10"></td>
<td><input type="text" name="paid2" id="paid2"></td>
</tr>
<tr>
<td><input type="text" name="address3" id="address3"></td>
<td><input type="text" name="pcode3" id="pcode3" size="10"></td>
<td><input type="text" name="months3" size="10"></td>
<td><input type="text" name="amount3" id="amount3" value="" onblur="calculateForm();" size="10"></td>
<td><input type="text" name="paid3" id="paid3"></td>
</tr>
<tr>
<td><input type="text" name="address4" id="address4"></td>
<td><input type="text" name="pcode4" id="pcode4" size="10"></td>
<td><input type="text" name="months4" size="10"></td>
<td><input type="text" name="amount4" id="amount4" value="" onblur="calculateForm();" size="10"></td>
<td><input type="text" name="paid4" id="paid4"></td>
</tr>
<tr>
<td><input type="text" name="address5" id="address5"></td>
<td><input type="text" name="pcode5" id="pcode5" size="10"></td>
<td><input type="text" name="months5" size="10"></td>
<td><input type="text" name="amount5" id="amount5" value="" onblur="calculateForm();" size="10"></td>
<td><input type="text" name="paid5" id="paid5"></td>
</tr>
<tr>
<td><input type="hidden" name="" id=""></td>
<td><input type="hidden" name="" id="" size="10"></td>
<td><input type="text" name="" size="10" value="Total Paid"></td>
<td><input type="text" name="total_paid" id="total_paid" value="" size="10"></td>
<td><input type="hidden" name="" id=""></td>
</tr>
</tbody></table>
</fieldset>
</div>
I have checked the apache2 and the mysql logs and no errors.
Any help would be greatly appreciated.
Thanx ZZ

Sum of Price is showing wrong value

I have made an invoice form.. everything is working but sum of all product price is showing wrong. I am not very good with the Javascript. Need Your help.
js for total sum:
<script type="text/javascript">
window.sumInputs = function() {
var inputs = document.getElementsByTagName('input'),
result = document.getElementById('total'),
sum = 0;
for(var i=0; i<inputs.length; i++) {
var ip = inputs[i];
if (ip.name && ip.name.indexOf("total") < 0) {
sum += parseInt(ip.value) || 0;
}
}
result.value = sum;
}
</script>
html table:
Here I have declared my id's for my calculations. This
is working well.
<table>
<tr>
<td><input type="text" class="street" class="menu_name" name="user[0][name]" value=""></td>
<td><input type="text" id="q2" name="user[0][age]" value=""></td>
<td><input type="text" id="q1" class="menu_price" name="user[0][address]" value=""><br></td>
<td><input type="text" id="t3" name="user[0][email]" value=""></td>
</tr>
<tr>
<td><input type="text" class="street1" class="menu_name1" name="user[1][name]" value=""></td>
<td><input type="text" id="r2" name="user[1][age]" value=""></td>
<td><input type="text" id="r1" class="menu_price1" name="user[1][address]" value=""><br></td>
<td><input type="text" id="t4" name="user[1][email]" value=""></td>
</tr>
<tr>
<td><input type="text" class="street2" class="menu_name2" name="user[2][name]" value=""></td>
<td><input type="text" id="t2" name="user[2][age]" value=""></td>
<td><input type="text" id="t1" class="menu_price2" name="user[2][address]" value=""><br></td>
<td><input type="text" id="t7" name="user[2][email]" value=""></td>
</tr>
<tr>
<td><input type="text" class="street3" class="menu_name3" name="user[3][name]" value=""></td>
<td><input type="text" id="h2" name="user[3][age]" value=""></td>
<td><input type="text" id="h1" class="menu_price3" name="user[3][address]" value=""><br></td>
<td><input type="text" id="t8" name="user[3][email]" value=""></td>
</tr>
<tr>
<td><input type="text" class="street4" class="menu_name4" name="user[4][name]" value=""></td>
<td><input type="text" id="y2" name="user[4][age]" value=""></td>
<td><input type="text" id="y1" class="menu_price4" name="user[4][address]" value=""><br></td>
<td><input type="text" id="t9" name="user[4][email]" value=""></td>
</tr>
<tr><td>Total : <input type="text" name="total" id="total"/>
Sum //Here is my problem it's not showing correct value
</td>
</tr>
<?php echo form_submit($submit);?>
</table>
Here is a JSFiddle

I have made some changes. Actually the js is adding up all the inputs value. But you require only the value of price input.
http://fiddle.jshell.net/h9753snz/

sum all values for table column based on class and show in textbox

Here is a tutorial i followed for reference: http://viralpatel.net/blogs/2009/07/sum-html-textbox-values-using-jquery-javascript.html
Here is my javascript....
<script type="text/javascript">
$(document).ready(function(){
//iterate through each textboxes and add keyup
//handler to trigger sum event
$(".txt").each(function() {
$("#btn").click(function(){
calculateSum();
$("#sum").show();
});
});
});
function calculateSum() {
var sum = 0;
//iterate through each textboxes and add the values
$(".txt").each(function() {
//add only if the value is number
if(!isNaN(this.value) && this.value.length!=0) {
sum += parseFloat(this.value);
}
});
//.toFixed() method will roundoff the final sum to 2 decimal places
$("#sum").html(sum.toFixed(2));
</script>
This is my html code to show the sum value..
<table width="1177" border="1" cellspacing="5" id="add" class="add">
<tr>
<td width="71" height="42"><button class="add">Add Rows</button></td>
<td width="144"><div align="center"><strong>Product Name</strong></div></td>
<td width="146"><div align="center"><strong>Brand Name</strong></div></td>
<td width="146"><div align="center"><strong>Model No</strong></div></td>
<td width="146"><div align="center"><strong>Dealer Price</strong> (DP)</div></td>
<td width="146"><div align="center"><strong>Quantity (Q)</strong></div></td>
<td width="146"><div align="center"> <strong>Total Price</strong> (TP) </div>
<div align="center">
(TP = DP x Q)
</div>
</td>
<td width="153"><div align="center"><strong>Quality</strong></div></td>
<td><div align="center"><strong>Insert Image</strong></div></td>
</tr>
<tbody>
<tr class="prototype">
<td height="26"><button class="remove">Remove</button></td>
<td><input type="text" name="product[]" id="product" /></td>
<td><input type="text" name="brand[]" id="brand" /></td>
<td><input type="text" name="model[]" id="model" /></td>
<td><input type="text" name="dprice[]" class="price"/></td>
<td><input type="text" name="quantity[]" class="quantity"/></td>
<td><input name="txt[]" type="text" class="txt" /></td>
<td><input type="text" name="quality[]" id="quality"/></td>
<td><input name="images[]" type="file"/></td>
</tr>
<tr>
<td height="26"><button class="remove">Remove</button></td>
<td><input type="text" name="product[]" id="product" /></td>
<td><input type="text" name="brand[]" id="brand" /></td>
<td><input type="text" name="model[]" id="model" /></td>
<td><input type="text" name="dprice[]" class="price"/></td>
<td><input type="text" name="quantity[]" class="quantity"/></td>
<td><input name="txt[]" type="text" class="txt" id="tp" /></td>
<td><input type="text" name="quality[]" id="quality"/></td>
<td><input name="images[]" type="file" id="image"/></td>
</tr>
<tr>
<td height="26"><button class="remove">Remove</button></td>
<td><input type="text" name="product[]" id="product" /></td>
<td><input type="text" name="brand[]" id="brand" /></td>
<td><input type="text" name="model[]" id="model" /></td>
<td><input type="text" name="dprice[]" class="price"/></td>
<td><input type="text" name="quantity[]" class="quantity"/></td>
<td><input name="txt[]" type="text" class="txt" id="tp" /></td>
<td><input type="text" name="quality[]" id="quality"/></td>
<td><input name="images[]" type="file" id="image"/></td>
</tr>
<tr>
<td height="26"><button class="remove">Remove</button></td>
<td><input type="text" name="product[]" id="product" /></td>
<td><input type="text" name="brand[]" id="brand" /></td>
<td><input type="text" name="model[]" id="model" /></td>
<td><input type="text" name="dprice[]" class="price"/></td>
<td><input type="text" name="quantity[]" class="quantity"/></td>
<td><input name="txt[]" type="text" class="txt" id="tp" /></td>
<td><input type="text" name="quality[]" id="quality"/></td>
<td><input name="images[]" type="file" id="image"/></td>
</tr>
</tbody>
</table>
</div>
<table width="1206" border="0">
<tr>
<td width="905"> </td>
<td width="86"><input name="btn" type="submit" id="btn" value="Grand Total" /></td>
<td width="201"><input name="sum" type="text" id="sum"/></td>
</tr>
How to show this sum value in textbox after button click.
Please help...

try this with val() method I have edited the answer..
<script>
$(document).ready(function () {
//iterate through each textboxes and add keyup
//handler to trigger sum event
$(".txt").each(function () {
$("#btn").click(function () {
calculateSum();
$("#sum").show();
});
});
});
function calculateSum() {
var sum = 0;
//iterate through each textboxes and add the values
$(".txt").each(function () {
//add only if the value is number
if (!isNaN(this.value) && this.value.length> 0) {
sum += parseFloat(this.value);
}
});
//.toFixed() method will roundoff the final sum to 2 decimal places
$("#sum").val(sum.toFixed(2));
}
</script>
here is the Fiddle

Okay, so I know this is the kind of answer that annoys people but...
Have you tried debuging javascript? It is possible to debug javascript code. For example using firebug: https://getfirebug.com/javascript . It might help.
Also, where are you assigning value of Sum to anything? Are you sure you did not want sum to be global variable (outside of any function)?

$('#idOfTextBox').val(sum.toFixed(2));

Jquery Sum by Group from Table/Input Data

I'm looking to Group my Table data and Sum by the group (like sum price by product). In a second Table.
I want group or filter by Item column, and sum the result of the Price column.
So Oranges (having two lines) should be one line with Sum price.
See this example below:
<table width="400" border="1">
<tr>
<td>Item</td>
<td>Location</td>
<td>Quantity</td>
<td>Price</td>
</tr>
<tr>
<td><input name="item" type="text" id="item" value="Orange" /></td>
<td><input name="location" type="text" id="location" value="Tree" /></td>
<td><input name="quantity" type="text" id="quantity" value="3" /></td>
<td><input name="price" type="text" id="price" value="3.00" /></td>
</tr>
<tr>
<td><input name="item" type="text" id="item2" value="Apple" /></td>
<td><input name="location" type="text" id="location" value="Tree" /></td>
<td><input name="quantity" type="text" id="quantity" value="1" /></td>
<td><input name="price" type="text" id="price" value="1.00" /></td>
</tr>
<tr>
<td><input name="item" type="text" id="item" value="Orange" /></td>
<td><input name="location" type="text" id="location" value="Tree" /></td>
<td><input name="quantity" type="text" id="quantity" value="4" /></td>
<td><input name="price" type="text" id="price" value="4.00" /></td>
</tr>
<tr>
<td><input name="item" type="text" id="item" value="Grapes" /></td>
<td><input name="location" type="text" id="location" value="Vine" /></td>
<td><input name="quantity" type="text" id="quantity" value="10" /></td>
<td><input name="price" type="text" id="price" value="10.00" /></td>
</tr>
</table>
<p> </p>
<table width="400" border="1">
<tr>
<td>Orange</td>
<td>7</td>
<td>7.00</td>
</tr>
<tr>
<td>Apple</td>
<td>1</td>
<td>1.00</td>
</tr>
<tr>
<td>Grapes</td>
<td>10</td>
<td>10.00</td>
</tr>
</table>

First change id "price" to class, then
$(document).ready(function(){
var sum = 0;
$('.price').each(function(){
sum += $(this).val();
});
alert("The sum is " + sum);
});
You can modify above code to get sum in button click event too.