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Html/JS: Link cell values of one column of one table from cells of another column of another table

I am new to coding and am trying to make a table using values from another table.
For example, the following table has a column for "Contact" (names)
<table>
<tr>
<th>Role</th>
<th>Contact</th>
<th>Email</th>
</tr>
<tr>
<td>Role1</td>
<td>Person1 </td>
<td>Person1#xyz.com</td>
</tr>
<tr>
<td>Role2</td>
<td>Person2</td>
<td>Person2#xyz.com</td>
</tr>
</table>
My second table (ttask) has a list of tasks and has a column for the "Contact" assigned to a task. I would like to link the value for the Contact cells in the following table with its corresponding Contact in the 1st table so that if I change the Contact's name in the 1st table, it will update in all the Table ttask cells involving that Contact's name. How can I make this happen?
<table id="ttask">
<tr>
<th>Weeks Prior</th>
<th>Role</th>
<th>Contact</th>
<th>Task</th>
</tr>
<tr>
<td>16</td>
<td>AH</td>
<td>Person1</td>
<td>
What currently needs to be done. The task and what's involved blah blah
</td>
</tr>
</table>
Thank you so much!

first take different id for both table td and try this
$(document).ready(function(){
VAR abc = $(document.getElementById("tdidoffirsttable").innerHTML);
document.getElementById("td id of second table").innerHTML = abc;
});

The question is somewhat unclear because you didn't mention if you are willing to use html only or not. If you are willing to consider javascript, then this can work:
<p id="demo1">person1</p>
<p id="demo2">person2</p>
<script>
function myFunction() {
var str = document.getElementById("demo2").innerHTML;
document.getElementById("demo1").innerHTML = str;
}
myFunction();
</script>
Of course this is per row, if you data contains multiple lines then should be adapted by doing a loop in order to simplify.

Select and sort a column in a table using Javascript

I want to select a particular column of a table and sort it accordingly using Javascript (No frameworks or plugins). Could anyone help me regarding this?
<table>
<thead>
<tr>
<td>Col1</td>
<td>Col2</td>
<td>Col3</td>
<td>Col4</td>
</tr>
</thead>
<tbody>
<tr>
<td>Data11</td>
<td>Data23</td>
<td>Data53</td>
<td>Data45</td>
</tr>
<tr>
<td>Data81</td>
<td>Data42</td>
<td>Data33</td>
<td>Data4854</td>
</tr>
<tr>
<td>Data84681</td>
<td>Data452</td>
<td>Data354</td>
<td>Data448</td>
</tr>
<tr>
<td>Data1846</td>
<td>Data25635</td>
<td>Data3232</td>
<td>Data44378</td>
</tr>
</tbody>
</table>

function sortTableByColumn(tableId,columnNumber) { // (string,integer)
var tableElement=document.getElementById(tableId);
[].slice.call(tableElement.tBodies[0].rows).sort(function(a, b) {
return (
a.cells[columnNumber-1].textContent<b.cells[columnNumber-1].textContent?-1:
a.cells[columnNumber-1].textContent>b.cells[columnNumber-1].textContent?1:
0);
}).forEach(function(val, index) {
tableElement.tBodies[0].appendChild(val);
});
}
In your page, add id to the table tag:
<table id="myTable">
From javascript, use:
sortTableByColumn("myTable",3);
tBodies[0] is used because there can be many. In your example there is only one.
If we have var arr=[123,456,789], [].slice.call(arr) returns a copy of arr.
We're feeding it the html-rows-collection, found in tBodies[0] of tableElement.
Then, we sort that array with an inline function that compares two array elements, here: rows (<tr>).
Using cells[columnNumber] we access the <td>s, and textContent to access the text content. I've used columnNumber-1 so you can enter 3 for third column instead of 2, because the index of first element of an array (column 1) is 0...
The forEach goes through the elements of the array, which is by now in order, and appendChild row to the tBody. Because it already exist, it just moves it to the end: moving the lowest value to the end, then moving the second lowest to the (new) end, until it ends with the highest value, at the end.
I hope this is what you want. If so, enjoy!

Try using datatables you can get it from http://datatables.net its reallt easy to use. depends on jQuery
$("table").dataTable();
boom! and its done.

.each() function on affect current object

having some issues with my code below, first here is the HTML:
<table class="finance-table">
<tbody><tr>
<th></th>
<th>Deposit</th>
<th>Balance</th>
<th>Fees</th>
<th>Total Payable</th>
<th>Term</th>
<th>Fixed Rate</th>
<th>Representative APR</th>
<th>Monthly Pmt</th>
</tr>
<tr class="hp">
<td><strong>HP</strong></td>
<td id="td_finance_deposit">£11700.00</td>
<td id="td_finance_balance">£105300.00</td>
<td id="td_finance_fees">£298.00</td>
<td id="td_finance_total_inc_deposit">£146255.50</td>
<td id="td_finance_term">60 mths</td>
<td id="td_finance_rate">5.50%</td>
<td id="td_finance_apr">10.1%</td>
<td id="td_finance_monthly_payments">£2242.59 p/m* x 60 mths</td>
</tr>
</tbody></table>
There is about 10 of these tables [within the same document], all with the same id's and class's. I'm using an each loop to execute some code against each table found, however it only seems to be working on the first table and disregards the others.
Below is the jQuery, like I said works find on the first table, but ignores the rest!
<!-- Remove First and Final Payment from Showroom Finance Examples -->
<script>
$(".finance-table").each(function(key, value) {
// Display loading
var html = $(this);
// Remove the First Payment and Final Payment Column
$(this).find("#td_finance_first_payment, #td_finance_final_payment").remove();
$(this).find("th:contains('1st Pmt')").remove(); $(this).find("th:contains('Final Pmt')").remove();
// Get the Term and update the monthly payment
var term = $(this).find("#td_finance_term").html(); // .replace(/\D/g,'')
var payments = ($(this).find("#td_finance_monthly_payments").html()).split('x')[0];
($(this).find("#td_finance_monthly_payments")).html(payments + " x " + term);
})
</script>
Edit:
Please note, I can't change the HTML at all

You should first give a unique ID to each <td>, perhaps with your DB identifier for that record. You don't need it now but this will allow you to do other thing later if you need it.
Then change all the <td> ids to classes:
<td class="td_finance_fees">£298.00</td>
Finally change all your javascript accordingly to use class instead of IDs:
$(this).find(".td_finance_first_payment, .td_finance_final_payment").remove();

Using Attribute Equals Selector
Change your code from:
$(this).find("#td_finance_first_payment, #td_finance_final_payment").remove();
to:
$(this).find('td[id="td_finance_first_payment"], td[id="td_finance_final_payment"]').remove();
Do this type of change for all areas of #xxx to id="xxx"
What this does is find all tds with attribute id="xxx", rather than using #id identifier, this is forces jQuery to do a tree search.
Also your HTML does not match your code, (theres no td_finance_first_payment in your html, I assume you removed it?)
Edit: This solution is useful if you 100% cannot edit the html (comes from a source you have no control over, such as an API or internal software). Best solution would be to fix the ids!

Loop through multiple TD, grab multiple values, fill array

I have two tables on the page.
Inside of my second table I am dynamically adding html from JS.
I am checking to see if the <tr> inside of the tbody are empty using:
var rowCount = $('#dynatable >tbody >tr').length;
If the row count is 0 I continue on with my javascript, if 1 or more <tr> exists I need to go through each <tr> and grab the two input values inside the <td>; for every <tr> available. Then need to collect the data into an array for server-side processing.
<table id="dynatable">
<thead>
<tr>
<th>Time</th>
<th>Description</th>
</tr>
</thead>
<tbody id="p_scents">
<tr><td class="ts_td"><input type="text" name="ts_value[]" class="timestamp_input"/></td><td><TEXTAREA NAME="ts_description[]" class="ts_desc" rows="3" cols="30" style="resize:none;" ></TEXTAREA></td></tr>
<tr><td class="ts_td"><input type="text" name="ts_value[]" class="timestamp_input"/></td><td><TEXTAREA NAME="ts_description[]" class="ts_desc" rows="3" cols="30" style="resize:none;" ></TEXTAREA></td></tr>
</tbody>
I have browsed similar questions but I cannot figure out a solution for my situation. I had a previous solution using simpleHTMLDOM + PHP but it's way too slow performance wise.
I was told to use JS or jquery and I am quite unfamiliar with both, any help is greatly appreciated.
How do I grab the values of multiple inputs from multiple <tr>'s inside a specific table and store the values in an array?

If your classes will be the same, you could do something like this with jQuery.
It put the values into arrays.
var values = $("input[class='timestamp_input']").map(function(){return $(this).val();}).get();
var textAreaValues = $("textarea[class='ts_desc']").map(function(){return $(this).val();}).get();
console.log(values);
console.log(textAreaValues);
JSFiddle demo here.

Complex jQuery filter() not working

I am trying to dynamically insert links to return to the top of the document at the end of every section of a web page (sad to say, but it's table-based layout). I'm using the jQuery filter() selector, and while I get no error, it's not making any changes in the browser output. When I use alert() with the variable, it says Object object. I understand that the problem is in the line where I define the filter itself, but I was unable to find a similar example, and I don't know how to fix it.
Here's the code:
HTML
<table>
<tr class="head"><td colspan="2">section title 1 </td></tr>
<tr><td>text</td>
<td><img /></td>
</tr>
<tr><td>text</td>
<td>< img /></td>
</tr>
<tr class="head"><td colspan="2">section title 2 </td></tr>
<tr><td>text</td>
<td><img /></td>
</tr>
<tr><td>text</td>
<td>< img /></td>
</tr>
<!-- you get the point -->
JavaScript
$(document).ready(function(){
var lastRow = $('tr').filter(function(){
return $(this).next()==$(".head"); // Here's the problem, IMO
});
var a = '<tr class="toTop"><td class="top" style="text-align:right" colspan="2">go to top ↑</td></tr>';
lastRow.after(a);
});
The script attempts to select each row that precedes a row with class="head" and insert a row with a top link.

That's because you are comparing 2 different objects that is always false, you should use is method or length property:
var lastRow = $('tr').filter(function(){
return $(this).next(".head").length;
// return $(this).next().is(".head");
});
However, I'd suggest using .prev() method:
$('tr.head').prev(); // selects the previous sibling tr element