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How do I display the content of closest <td> on javascript?

I have looked everywhere, but my code does not work at all. I simply want to display the content of the td I'm clicking on.
I have this table:
<tr class='rowData' tooltip='{caracteristicas}'>
<td nowrap class='Body'><a href='{caracteristicas}' target="_blank" style="color:black" onClick='return confirm("VOCÊ SERÁ REDIRECIONADO PARA:\r\r {caracteristicas}")'>{inputDescItem}</a></td>
<td nowrap class='Body' align='right'>{quantidade} {hiddenCodigoItem}</td>
<td nowrap class='Body' align='center'>{grupoEstoque}</td>
<td nowrap class='Body' align='center'>{inputCodigoItem}</td>
<td nowrap class='Body' align='center'>{btnAtualizaItem}</td>
<td nowrap class='Body' align='center'><button type="button" class="btnTest">Assign</button></td>
<td nowrap class='Body' align='center' class="testNameClass" name="output" style="display:none;">{caracteristicas}</td>
</tr>
I want it so that when I click on the CLICK ME tag, it will display (in a pop-up, alert, modal or anything) the content of the below tag (that I'm not displaying).
I have the following javascript:
$("btnTest").on("click", function() {
alert($(this).closest('tr').find('testNameClass').val());
});
I'm not very good at JS so please go easy on me.

Look like you missing
$(".btnTest") instead of $("btnTest")
and just try
$(".btnTest").on("click", function() {
alert($(this).parents('tr').find('.testNameClass').val());
});

To target specific elements using a class you need to use a dot in front of the class name. In your case .btnTest and .testNameClass.
$(".btnTest").on("click", function() {
alert($(this).closest('tr').find('.testNameClass').text());
});
As you are looking for the text inside the td element you should use .text() instead of .val()
In the below example column ent_3 is hidden and you will get its values using the script mentioned above.
$(".btnTest").on("click", function() {
alert($(this).closest('tr').find('.testNameClass').text());
});
.testNameClass {
display: none;
}
table {
border-collapse: collapse;
}
th, td { border: 1px solid #000; padding: 10px; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table class="table table-bordered" id="dataTable">
<thead>
<tr>
<th>pk</th>
<th>ent_1</th>
<th>ent_2</th>
<th>ent_3</th>
</tr>
</thead>
<tbody>
<tr>
<td>PK Row 0</td>
<td>Ent_1</td>
<td><button type="button" class="btnTest">Assign</button></td>
<td class="testNameClass">Row 0 Ent_3</td>
</tr>
<tr>
<td>PK Row 1</td>
<td>Ent_1</td>
<td><button type="button" class="btnTest">Assign</button></td>
<td class="testNameClass">Row 1 Ent_3</td>
</tr>
<tr>
<td>PK Row 2</td>
<td>Ent_1</td>
<td><button type="button" class="btnTest">Assign</button></td>
<td class="testNameClass">Row 2 Ent_3</td>
</tr>
</tbody>
</table>

Your method will be handed a reference to the MouseEvent which represents details of the click. Since it is an Event, it has a currentTarget which represents an "element" in the so-called DOM ... an internal data-structure which represents the HTML. This data structure is in the form of a tree, where each node has one parent, two siblings, and some children. You can now write code to "walk up the tree" until you encounter a td node. The first one you come to is the innermost containing td.

I think you are targeting is incorrect use a . before the class name - also I see two classes in one element I set this up for you here have a look
https://jsfiddle.net/hw0ansyj/1/
$(".btnTest").on("click", function() {
alert($('.testNameClass').html());
});

How to highlight table rows by hover over another div?

i have two tables
<table id='standings'>
<tr id='tableTeam1'>
<td>Team1</td>
</tr>
<tr id='tableTeam2'>
<td>Team2</td>
</tr>
<tr id='tableTeam3'>
<td>Team3</td>
</tr>
</table>
<table id='matches'>
<tr id='match1'>
<td id='matchTeam1>Team1</TD>
<td class='score'> 22-31</td>
<td id='matchTeam3>Team3</td>
</tr>
</table>
My goal is to hover over the row with id 'match1' from the second table and have the rows with id 'tableTeam1' and 'tableTeam3' highlighted
1.)
how is this possible by js/css?
2.) How can it be done by using a php database request when
"Select tableTeam1,tableTeam2 from matches where id='match1'"
Thank you so much in advance

Try this:
$('#match1')
.mouseenter(function() {
$('#tableTeam1').addClass('highlighted');
})
.mouseleave(function() {
$('#tableTeam1').removeClass('highlighted');
})
You also need to add some CSS there, like this one:
.highlighted { background-color: red;}
I don't know your data structure but it should be something like that, I think:
...
<tr id="<?php echo $data['column_name']; ?>" <?php echo ($data['column_name'] === 'match1')? 'class="highlighted"' : ''; ?>>
...

Put your team numbers in a data attribute in rows of the matches then it is fairly simple to parse them to match the elements in the other table and toggle a class on them
$('#matches .match-row').hover(function() {
const teams = $(this).data('teams');
teams.forEach(num => $('#tableTeam' + num).toggleClass('active'))
})
tr.active {
color: red
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id='standings' border=1>
<tr id='tableTeam1'>
<td>Team1</td>
</tr>
<tr id='tableTeam2'>
<td>Team2</td>
</tr>
<tr id='tableTeam3'>
<td>Team3</td>
</tr>
</table>
<table id='matches' border=1>
<tr class="match-row" data-teams="[1,3]">
<td>Team1</td>
<td class='score'> 22-31</td>
<td>Team3</td>
</tr>
<tr class="match-row" data-teams="[2,3]">
<td>Team2</td>
<td class='score'> 55-1 Blowout!</td>
<td>Team3</td>
</tr>
</table>

How can I search in a HTML table without using any mysql queries, just a plain javascript or jquery to be specific?

About this problem, I saw a some solution here at Stack Overflow and the solution redirects me here: http://jsfiddle.net/9hGym/
On JS fiddle, the code works but when I implement it on my editor and run it, it's not working. By the way, as a library I used Google CDN, I don't know if it is proper way, so help me. Here's my code by the way..
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script language = "javascript">
// Write on keyup event of keyword input element
$("#search").keyup(function(){
_this = this;
// Show only matching TR, hide rest of them
$.each($("#table tbody").find("tr"), function() {
console.log($(this).text());
if($(this).text().toLowerCase().indexOf($(_this).val().toLowerCase()) == -1)
$(this).hide();
else
$(this).show();
});
});
</script>
</head>
<body>
<div class="row large-centered">
<h1>World of Warcraft characters. <small>Mine and my brothers, we share.</small></h1>
</div>
<div class="row large-centered">
<input type="text" id="search" placeholder="Type to search..." />
<table id="table" width="100%">
<thead>
<tr>
<th>Character name</th>
<th>Class</th>
<th>Realm</th>
</tr>
</thead>
<tbody>
<tr>
<td>Benjamin.</td>
<td>Rogue.</td>
<td>Uldum ES.</td>
</tr>
<tr>
<td>Cachoito.</td>
<td>Hunter.</td>
<td>Agamaggan EN.</td>
</tr>
<tr>
<td>Contemplario.</td>
<td>Paladin.</td>
<td>Uldum ES.</td>
</tr>
<tr>
<td>Elthron.</td>
<td>Death Knight.</td>
<td>Agamaggan ES.</td>
</tr>
<tr>
<td>Giloh.</td>
<td>Priest.</td>
<td>Agamaggan EN.</td>
</tr>
<tr>
<td>Kitialamok.</td>
<td>Warrior.</td>
<td>Agamaggan EN.</td>
</tr>
<tr>
<td>Magustroll.</td>
<td>Mage.</td>
<td>Agamaggan EN.</td>
</tr>
<tr>
<td>Marselus.</td>
<td>Mage.</td>
<td>Uldum ES.</td>
</tr>
<tr>
<td>Mistrala.</td>
<td>Warrior.</td>
<td>Uldum ES.</td>
</tr>
<tr>
<td>Suavemente.</td>
<td>Warrior.</td>
<td>Agamaggan EN.</td>
</tr>
<tr>
<td>Tittus.</td>
<td>Monk.</td>
<td>Agamaggan EN.</td>
</tr>
<tr>
<td>Yarlokk.</td>
<td>Warlock.</td>
<td>Uldum ES.</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>

You should place the javascript code within a $(document).ready, this will ensure the function is run after the DOM is ready.
<script language = "javascript">
$( document ).ready(function(){
// Write on keyup event of keyword input element
$("#search").keyup(function(){
_this = this;
// Show only matching TR, hide rest of them
$.each($("#table tbody").find("tr"), function() {
console.log($(this).text());
if($(this).text().toLowerCase().indexOf($(_this).val().toLowerCase()) == -1)
$(this).hide();
else
$(this).show();
});
});
});
</script>

You can try to use getElementsByTagName, and catch all "TD" elements, like this:
<html>
<body>
<script>
function _Change()
{
var TD = document.getElementsByTagName('td');
i=0;
do {
if ( TD[i].innerHTML.trim().localeCompare("three") == 0 ) TD[i].innerHTML = "3";
i++;
} while(i<TD.length)
}
</script>
<table border=1>
<tr><td> one </td> <td> two </td></tr>
<tr><td> three </td> <td> four </td></tr>
<tr><td> five </td> <td> six </td></tr>
</table>
<button onclick="_Change()"> change </button>
</body>
</html>

jQuery: Position of Images inside a HTML Table

Say I have a table:
<table id="table1" border="1">
<tr>
<td id='id1' style="width:200px"></td>
<td id='id2' style="width:200px">2222</td>
</tr>
</table>
I am using following code to add images to these table cells
$('#id1').append('<img src=images/image1.jpg />');
$('#id1').append('<img src=images/image2.jpg />');
$('#id1').append('<img src=images/image3.jpg />');
$('#id2').append('<img src=images/image4.jpg />');
Now what I want to achieve is this:
1. for cell "id2", i want the image always align to the right so it's not next to the text.
2. for cell "id1", since those 3 images has different sizes (24x24, 32x32, 24x24), i don't want them to be next to each other. what I want is that as if there are 3 small cells in that cell, each with size 32x32, and put those images into those small cells one by one.
I am not good at html or javascript. is it possible to do so?

CSS
#id2 img { float: right; }
HTML
<table id="table1" border="1">
<tr>
<td id='id1' style="width:200px"><table><tr></tr></table></td>
<td id='id2' style="width:200px">2222</td>
</tr>
</table>
Javascript
$('#id1').find('tr').append('<td><img src=images/image1.jpg /></td>');
...

Based off item #2 I'd say you're not done defining your table. You need to add a nested table in #id2 (the merits of this approach can be debated later).
So your table would be
<table>
<tr>
<td id="id1"></td>
</tr>
<tr>
<td>
<table>
<tr>
<td id="id1a"></td>
<td id="id1b"></td>
<td id="id1c"></td>
</tr>
</table>
</td>
</tr>
</table>
From there you'd append your images to the sub-cells.

fetch HTML Element object using javascript, mootools

Please check my HTML below:
<table cellpadding="0" cellpadding="0" border="0">
<tr>
<td>
<div class="toogler">Demo1</div>
</td>
</tr>
<tr>
<td>
<div class="element">Demo1 Content</div>
</td>
</tr>
<tr>
<td>
<div class="toogler">Demo1</div>
</td>
</tr>
<tr>
<td>
<div class="element">Demo1 Content</div>
</td>
</tr>
<tr>
<td>
<div class="toogler">Demo2</div>
</td>
</tr>
<tr>
<td>
<div class="element">Demo2 Content</div>
</td>
</tr>
<tr>
<td>
<div class="toogler">Demo3</div>
</td>
</tr>
<tr>
<td>
<div class="element">Demo3 Content</div>
</td>
</tr>
<tr>
<td>
<div class="toogler">Demo4</div>
</td>
</tr>
<tr>
<td>
<div class="element">Demo4 Content</div>
</td>
</tr>
</table>
Here is my JS Code:
<script type="text/javascript" language="javascript">
$$('.toogler').each(function(e){
alert(e);
// this will alert all the toogler div object
});
</script>
my problem is that how can i fetch the object of the next div with class element
if i have object of the first toogler then how can i get the object of the next first div which class 'element'
I don't want to give the ids to the elements

if you can't alter the html output and refactor as suggested by oskar (best case), this works:
e.getParent().getParent().getNext().getFirst().getFirst() - it will return you the next div but it's slow.
unfortunately, tables break .getNext("div.element") as it's not a sibling.
another way that works is this (if their lengths match) - it will be MUCH faster if the reference is put in element storage as a 1-off:
var tooglers = $$("div.toogler"), elements = $$("div.element");
tooglers.each(function(el, i) {
console.log(elements[i]);
el.store("contentEl", elements[i]);
});
i don't like either solution though, not maintainable / scalable enough.

You shall have to iterate through and check for the class one by one.

The easiest way of assigning a toggler to the toggled element:
$$('.toogler').each(function(e, index){
console.log($$('.element')[index]);
});
Here's a working example: http://jsfiddle.net/oskar/aTaBB
Also, get rid of the table.

Try using Element.getNext([match]).
<script type="text/javascript" language="javascript">
$$('.toogler').each(function(e){
alert(e);
// Get the next sibling with class element.
var nextElement = e.getNext('.element');
alert(nextElement);
});
</script>