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add a no results message to table filteration

I have this following code which does filter a table but when there is no result it is blank.
Could someone help me out here to add a "No results found" message show when nothing found?
$(document).ready(function() {
$("#table_search").on("keyup", function() {
var value = $(this).val().toLowerCase();
$("#filter tr").filter(function() {
$(this).toggle($(this).text().toLowerCase().indexOf(value) > -1)
});
});
});
<table>
<tbody id="filter"></tbody>
</table>

Firstly note that your use of filter() isn't quite correct. It's intended to be used to reduce a set of elements based on a predicate condition supplied within the function argument which returns a boolean. Instead your current logic is using it as a basic looping mechanism.
With regard to the issue, you can use filter() to find matching rows by their text, then based on the number of filtered rows, hide or display the 'No matches' message. Something like this:
jQuery($ => {
let $rows = $('#filter tr');
let $tfoot = $('tfoot');
$("#table_search").on("input", function() {
var value = this.value.toLowerCase();
if (!value) {
$rows.show();
$tfoot.hide()
return;
}
let $filteredRows = $rows.filter((i, el) => el.innerText.toLowerCase().indexOf(value) != -1);
if ($filteredRows.length) {
$tfoot.hide();
$rows.hide();
$filteredRows.show()
} else {
$rows.hide();
$tfoot.show();
}
});
});
tfoot { display: none; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input id="table_search" />
<table>
<tbody id="filter">
<tr><td>Lorem</td></tr>
<tr><td>Ipsum</td></tr>
<tr><td>Dolor</td></tr>
<tr><td>Sit</td></tr>
<tr><td>Amet</td></tr>
<tr><td>Consectetur</td></tr>
<tr><td>Adipiscing</td></tr>
<tr><td>Elit</td></tr>
</tbody>
<tfoot>
<tr><td>No matches</td></tr>
</tfoot>
</table>
Finally, note the use of input instead of keyup. The latter works better in this instance as it also works for users who copy/paste text in to the search box.

Applying multiple filtering on dynamic HTML table

I am trying to apply multiple filtering using two input tags.
The first one asks for the employee id and the second one asks for the employee name. The table is reading data from a .xlsx file.
Here is my code for filtering.
$rows = $("#tblData tr");
$("#empId", "#empName").on("input", function () {
var val1 = $.trim($('#empId').val()).replace(/ +/g, ' ').toLowerCase();
var val2 = $.trim($('#empName').val()).replace(/ +/g, ' ').toLowerCase();
$rows.show().filter(function () {
var text1 = $(this).find("td:nth-child(1)").text().replace(/\s+/g, ' ').toLowerCase();
var text2 = $(this).find("td:nth-child(2)").text().replace(/\s+/g, ' ').toLowerCase();
return !~text1.indexOf(val1) || !~text2.indexOf(val2);
}).hide();
});
I heard that I should change the statements td:nth-child(1) and td:nth-child(2) to the index of the row rather than hardcoding it.

You filtering function is working...
But the input event handler is assigned to a selector having a syntax error.
$("#empId","#empName") should be $("#empId,#empName").
Notice the quotes.
Then I suggest something more concise... Using .trim(). But your way, using .replace() was working.
$(document).ready(function(){
$rows=$("#tblData tr");
$("#empId,#empName").on("input",function(){
var val1 = $('#empId').val().trim().toLowerCase();
var val2 = $('#empName').val().trim().toLowerCase();
console.log(val1 +" | "+ val2);
$rows.show().filter(function(){
var text1=$(this).find("td:nth-child(1)").text().trim().toLowerCase();
var text2=$(this).find("td:nth-child(2)").text().trim().toLowerCase();
return !~text1.indexOf(val1)||!~text2.indexOf(val2);
}).hide();
});
});
#tblData tr td{
border:1px solid black;
height:1em;
width:14em;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
ID: <input type="txt" id="empId"><br>
Name: <input type="txt" id="empName"><br>
<br>
<table id="tblData">
<tr>
<td>0001</td><td>John Doe</td><td>President</td>
</tr>
<tr>
<td>0002</td><td>Jane Doe</td><td>Secretary</td>
</tr>
<tr>
<td>0157</td><td>Ali Gator</td><td>Accountant</td>
<tr>
</table>
Now about the nth-child() selector, because you did not post your HTML, I assumed that the intend was to target some specific td, like a specific column in the table. I this case, those selector are well used.

Javascript find select element in a table cell

I got a table column with selects and text value cells like this:
<tr>
<td data-key="data1">some text data</td>
</tr>
<tr>
<td data-key="data2">
<select>
<option>1_option</option>
<option>2_option</option>
</select>
</td>
</tr>
I need to grab the data depending on the type of data in the cell. I do it like this:
var obj = $('#myTable tbody tr').map(function() {
var $row = $(this);
var localobj = {};
var cell = $row.find(':nth-child(1)');
dataattr = cell[0].getAttribute('data-key');
var selectObject = cell.find("select");
console.log(selectObject);
if(selectObject){ // always true here, but I need false if there is no select in the cell
localobj[dataattr] = selectObject.val();
}else{
localobj[dataattr] = cell.text();
}
return localobj;
}).get();
It grabs selected values correctly but cannot get the text ones because it always returns true in my if evaluation. Any ideas how to fix it?
Thank you

jQuery wraps everything in it's own object container and therefore selectObject will always evaluate to true as it is an object that is not undefined or null.
You can simply check to make sure the object has at least 1 element via
if (selectObject.length > 0) { ... }

try like this
var tbl = $('#tblHours');
tbl.find('tr').each(function(){
$(this).find('td').each(function(){
alert($(this).find('select :selected').val());
});
});

As
As explained by #Arvind Audacious, jQuery always returns a container. You cannot assume the result of the query is NULL. Instead, you need to check its length in order to verify if it has actually retrieved any elements. See code below for example:
$('#myTable tbody tr td').each(function(){
var selectObject = $(this).find('select');
if(selectObject.length == 0) {
console.log($(this).text())
} else {
console.log(selectObject);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Checking jQuery selector object won't work, as it will be always true. Checking the length of the selector return is the best approach for this. Please check the fiddle - https://jsfiddle.net/nsjithin/r43dqqdy/1/
var obj = $('#myTable tbody tr').map(function() {
var $row = $(this);
var localobj = {};
var td = $row.find('td').first();
var dataattr = td.attr('data-key');
var select = td.find('select');
if(select.length > 0){
console.log(select);
if(select.find('option:selected').length > 0){
localobj[dataattr] = select.val();
}
else{
// If not selected. What to do here??
}
}
else{
localobj[dataattr] = td.text();
}
return localobj;
}).get();
console.log(obj);

How to get value of text box embeded in cell

I have the following code
<tr val='question'>
<td>
<input style='width: 500px' type='text' placeholder='Q.Enter your question here for radio button? '>
</tr>
How can i find the value of input box embedded in cell .
function saveUserDefQues(){
var table=document.getElementById("QuestionList");
var surveyquestionform=document.forms[0];
var count=$('#QuestionList tr').length
for (var i = 0; i<count; i++) {
var row = table.rows[i];
if(row.getAttribute('val')==='question')
{
var Cells = row.getElementsByTagName("td");;
}
}
}

document.querySelector('tr[val] > td > input').value;
Array.from(document.querySelectorAll('tr[val] > td > input')).forEach(function(entry, index, entries)
{
entry.value; // you may store the value OR process with it AS you see fit
});

Since you are using Jquery this can be done this way.
replace this line of code
var Cells = row.getElementsByTagName("td");
with
var Cells = $(row).find('td');
var inputValue = Cell.find('input').val(); // gives you value of input
Code Refactoring recommended
I would like to refactor your code as below
HTML
<tr data-val='question'> // use data-* attribute to add custom attributes into tags
<td>
<input style='width: 500px' type='text' placeholder='Q.Enter your question here for radio button? '>
</td> // close your td
</tr>
Script
function saveUserDefQues(){
var surveyquestionform = document.forms[0]; // not sure what this is for, so ill leave it as is.
$('#QuestionList tr[data-val="question"]').each(function(){ //loop all tr's which has the data-val set to question
var inputValue = $(this).find('td input').val(); //get the value of input
console.log(inputValue);
});
}

$("tr[val='question'] > td > input").val()
But first you need to write a valid HTML. </td> closing tag is missing. Also you need to put this tr in a <table>.

See this Plunker
function getResult(){
$( "tr" ).each(function( index ) {
console.log($(this).find('input').attr('placeholder') );
});
}

How to hide any row in a table whose third cell value does not match a given string in JQuery

If i have a table:
<table id="myTable">
<tr>
<td>1</td><td>2</td><td>NoMatch</td><td>4</td>
</tr>
<tr>
<td>1</td><td>2</td><td>Match</td><td>4</td>
</tr>
</table>
I have been trying:
$(document).ready(function () {
$('input#myInput').keyup(function (val) {
// for each third td of each row, if this value does not contain: this.val() then hide it
});
});

Something like this:
var $cells = $('#myTable tr td:nth-child(3)'),
$hidden = $();
$('#myInput').keyup(function () {
var search = this.value;
var $to_hide = $cells.filter(function() {
return $(this).text() !== search;
}).parent();
$hidden.not($to_hide.get()).show();
$hidden = $to_hide.hide();
});
I assumed that when you say contains, you mean that the text has to be equal to the provided input (otherwise NoMatch and Match would not make sense). But if the content of cell just has to contain the search string as substring, you can use .indexOf() [docs].
DEMO
There are other things you have to consider, like what should happen when the search string is empty, but this is for you to play around ;)

Use "this" in your key up event handler to get the value of the input.
$(document).ready(function () {
$('input#myInput').keyup(function () {
//add if statement
alert($(this).val());
});
});
Not quite sure what you are trying to do with the table. There is not enough information.

Try this:
jsfiddle
HTML
<table id="myTable">
<tr>
<td>1</td><td>2</td><td>NoMatch</td><td>4</td>
</tr>
<tr>
<td>1</td><td>2</td><td>Match</td><td>4</td>
</tr>
</table>
<input id="myInput"/>
Javascript/Jquery
$('#myInput').keyup(function () {
var me = $(this);
var val = me.val();
$("#myTable tr").each(function() {
var tr = $(this);
var td = tr.find("td:eq(2)");
if(td.text().substring(0, val.length) === val) {
tr.show();
} else {
tr.hide();
}
});
});