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How to obtain text of a <td> element from another <td> element with jquery

I am trying to use a button inside a table division to set a variable as the same value as another division in the same row, but whenever I run my code (below), it returns the value of all the table divisions concatenated together. I am unsure why this was happening, so I replaced '.children()' with 'childnodes[0]' to try and get only the first name, but this just doesn't work and I don't why.
My html looks like this:
<table>
<tr>
<td>John</td>
<td>Doe</td>
<td><button>Get First Name</button></td>
</tr>
</table>
And my Javascript is this:
$(document).ready(function(){
$("button").click(function(){
var first = $(this).closest("tr").childNodes[0].text();
alert(first)
})
});

set a variable as the same value as another division in the same row
there are lots of possibilities for this, here are some (with the most useful first (opinion based))
$("button").click(function() {
var first = $(this).closest("tr").find("td:first").text();
var first = $(this).closest("tr").find("td").first().text();
var first = $(this).closest("tr").find("td").eq(0).text();
var first = $(this).closest("tr").children().first().text();
var first = $(this).closest("tr").children().eq(0).text();
var first = $(this).closest("td").siblings().first().text();
});
it returns the value of all the table cells concatenated together
https://api.jquery.com/text
Get the combined text contents of each element in the set of matched elements, including their descendants, or set the text contents of the matched elements.
because you're passing the "tr" to text() it gets the text of all the cells (tds) and their content etc and combines them as one, so you need to limit to the first as you've attempted.
however .childNodes[0] can only be applied to a DOM element/node, while $(this).closest("tr") gives you a jquery object/collection, which doesn't have .childNodes property.
So the jquery equivalent would be to use .children().eq(0).

You could use class identifiers to get information you need as well.
<table>
<tr>
<td><span class="first-name">John</span></td>
<td><span class="last-name">Doe</span></td>
<td>
<button class="btn-get-data" data-class="first-name">Get First Name</button>
<button class="btn-get-data" data-class="last-name">Get Last Name</button>
</td>
</tr>
</table>
$(document).ready(function() {
$(".btn-get-data").click(function() {
$btn = $(this);
$tr = $btn.closest('tr');
var first = $tr.find('.' + $btn.attr('data-class')).html();
alert(first);
})
});
If you make the button click generic like so, you can add additional buttons on the page and use that to get the class within that row.
Here is a working fiddle example: https://jsfiddle.net/b1r0nucq/

you could find the :first child and get his html(), as below:
$(document).ready(function() {
$("button").click(function() {
var first = $(this).closest("tr").children(":first").html();
alert(first)
})
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr>
<td>John</td>
<td>Doe</td>
<td><button>Get First Name</button></td>
</tr>
</table>

Get text from closest span using jQuery

I'm looking to retrieve the text inside a HTML table that is rendered via a webgrid. The text that I want is located inside a div with the class productID. My starting reference point is in the same row but the last td with the class span2. I'm trying to use jQuery's closest() method however I'm not getting any value returned.
Please see below for a section of the rendered HTML and my jQuery function:
HTML:
<tr>
<td class="span1"><div class="productID">1</div></td>
<td class="span2">Listing</td>
<td class="span2">Full Districtution</td>
<td class="span2">$1,350.00</td>
<td class="span2">2016-01-01</td>
<td class="span2"><div title="This is my brand new title!" data-original-title="" class="priceToolTip">2016-04-30</div></td>
<td>Select</td>
</tr>
jQuery:
$(".priceToolTip").mouseover(function () {
var row = $(this).closest("span1").find(".productID").parent().find(".productID").text();
console.log("Closest row is: " + row);
});

The .closest() method looks for a match in the ancestors. So you can use it to grab the tr then look for .productID like so:
var productID = $(this).closest('tr').find('.productID').text();
Or:
var productID = $(this).parent().find('.productID').text();
Or:
var productID = $(this).siblings('.span1').find('.productID').text();

.span1 is not the closest element of .priceToolTip. Use closest("tr").find(".span1 .productID") like following.
$(".priceToolTip").mouseover(function () {
var row = $(this).closest("tr").find(".span1 .productID").text();
console.log("Closest row is: " + row);
});

Getting the value of TD in a foreach loop

I have this code which show me the list of my item
<tbody class="table-color2">
<c:forEach var="defect" items="${defectList}">
<tr>
<td id="defectId"><a onclick="getDefectId()">${defect.id}</a></td>
<td>${defect.createdDate}</td>
<td>${defect.reportedBy.firstName}</td>
<td>${defect.title}</td>
<td>${defect.bugtype.description}</td>
<td>${defect.status.description}</td>
<td>${defect.priority.description}</td>
</tr>
</c:forEach>
</tbody>
what Im trying to do is to get the value of the td id="defectId" when it is clicked, my jquery script for the onclick is this :
function getDefectId(){
var defectId = $(' #defectId ').val();
alert("Defect ID " + defectId);
}
but currently, I'm getting a value of undefined, how do I get the value?

You have several issues. Firstly you're appending the same id in a loop, which will result in duplicates which is invalid. Also, a elements don't have a value to retrieve so you need to use text(). Finally note that using your current method would mean that you need to pass the this reference of the clicked element to the function.
However you can tidy all that up by using classes and hooking up the event in JS. Try this:
<tbody class="table-color2">
<c:forEach var="defect" items="${defectList}">
<tr>
<td class="defect">${defect.id}</td>
<td>${defect.createdDate}</td>
<td>${defect.reportedBy.firstName}</td>
<td>${defect.title}</td>
<td>${defect.bugtype.description}</td>
<td>${defect.status.description}</td>
<td>${defect.priority.description}</td>
</tr>
</c:forEach>
</tbody>
$(function() {
$('.defect a').click(function(e) {
e.preventDefault();
console.log($(this).text());
});
});
Working example

You can do the following(remember that id needs to be unique):
<td class="defectId"><a onclick="getDefectId(${defect.id})">${defect.id}</a></td>
And in you function:
function getDefectId(value){
alert("Defect ID " + value);
}

Try this : use text() instead of val() because you want to know the text inside td and not the value of input element.
EDIT: - Sorry, missed that there are multiple td's. In this case, you must not use same id for all tds. Just make it class and do following changes in function.
function getDefectId(){
var defectId = $('.defectId').text();
alert("Defect ID" + defectId);
}
I would suggest to use jQuery event handler instead of calling javascript function. See below code
HTML: remove onclick call
<td class="defectId">${defect.id}</td>
jQuery : register a click handler and read text
$(function(){
$('.defectId a').click(function(){
var defectId = $(this).text();
alert(defectId);
});
});

Pulling Data from table

I have a table in HTML:
<tr class="inner2-top">
<td class="name1"> Hello </td>
</tr>
How would I get the name1 in a javascript variable function like this?
function grabData() {
var name = // todo
}

You want the data that's inside of the td?
function grabData(className) {
return document.getElementsByClassName(className)[0].innerText;
}
console.log(grabData("name1"));
I suggest using id attributes instead of class attributes if you're going to use this method, though. ids are unique whereas classes are not, which will explain why you get unexpected results if you have more than one element with the class "name1" etc.

var name = $(".name1").text();
Try the above

you can get that text using class selector
var getName=$('.name1').html();
alert(getName);
DEMO

Check checkboxes using array of string

The user can provide an array of string and I want to look in a table and check the assosiated checkbox with the table row when one of the string is found.
I can see that the $("#activelisttable tr:contains(" + substr[i] + ")") contains a <tr> but it simply dosen't go in the .each function.
Here is the full code :
$("#savelistactive").click(function() {
var substr = $("#listtextactive").val().split("\n");
for (var i = 0; i < substr.length; i++)
{
$("#activelisttable tr:contains(" + substr[i] + ")").each(function(item) {
$(this).children("input").prop('checked', true);
});
}
$("#background").fadeOut("slow");
$("#listactive").fadeOut("slow");
});
Fiddle link : http://jsfiddle.net/5WVwe/

Problem Recap:
The problem is with your selector inside the for loop. #NobleMushtak recommended that you change the .each() in your original fiddle to be:
$("#activelisttable tr:contains(" + substr[i] + ")").children("input").prop('checked', true);
This was a good suggestion. However, having not seen your markup, it was unclear the exact HTML structure you were using. According to your fiddle, your HTML markup contains <tr>'s which then contain <th>'s within them:
<tr>
<th>
<input type="checkbox" class="selectall" />
</th>
<th>name</th>
</tr>
This means that there are no .children() of the <tr>'s with a type of input.
Solution:
Change .children() to be .find():
$("#activelisttable tr:contains(" + substr[i] + ")").find("input").prop('checked', true);
.find() does a deep search of all nested elements versus .children() which will only traverse down one more layer.
Works great with the change.
Updated JSFiddle
Reference Documentation:
.find()
.children()