message Alert on an empty search

Except you are appending a div to a table. Rather append a <Tr> keep the markup valid

Personally I would have the message after the table

<table ...>
</table>
<div class="alert" id="alert-msg">No rows found</div>

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JavaScript

function mySearch2(inpuArg, tableArg)
{
  var filter = inpuArg.toUpperCase();
  var alert = document.getElementById('alert-msg');
  var found = 0;
  for(var i = 0; i < tableArg.rows.length; i++) {
    var tr = tableArg.rows[i];
    var cell = tr.cells[1];

    if (cell.textContent.substr(0,filter.length).toUpperCase() == filter) {
      tr.style.display = 'table-row';
      found++;
    }
    else {
      tr.style.display = 'none';
    }
    found ? alert.style.display = 'inherit' : alert.style.display = 'none';
  }
} 

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Here is an updated version of the code

<script>
var tbl = document.getElementById('myTable');
var norows = document.getElementById('no-rows-alert');
document.getElementById('myInput').addEventListener('keyup', function() {
  var matchedRow = 0;
  for(var r = 0; r < tbl.rows.length; r++) {
    var row = tbl.rows[r];
    var matchedCell = 0;
    for (var c=0; c < row.cells.length; c++) {
      var cell = row.cells[c];
      var srch = this.value.toUpperCase();
      var cellVal = cell.textContent.substr(0, this.value.length).toUpperCase();
      if (srch == cellVal) {
        matchedCell++;
        break;
      }
    }
    matchedRow += matchedCell;
    row.style.display = matchedCell ? 'inherit' : 'none'
  }
  
  norows.style.display = matchedRow ? 'none' : 'inherit';
});
</script>

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Working sample here

Hi Julian. Leonidas solution answered my problem, but I thank you for adding solution which I impress too. However, on your solution I wish to use button before the search will start. Instead of using KeyUp function as shown on (myInput). I actually tried it but can't achieve since of limited knowledge about this language. Thank you!

I am confused - the code provided by Leonidas is based on your original code and appears to have a bug (From the original code)

This logic is wrong (in my view)

    if (cell.textContent.substr(0,filter.length).toUpperCase() == filter) {
      tr.style.display = 'table-row';
    }
    else {
    }

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The reason being that for rows that don't have the matching text the message is going to be displayed. In other words

Row 1 has matching text - first part if if fires and row is retained
Row 2 does not have matching text - second part of if fires and alert is shown - even though Row 1 was found.

There needs to be some flag to say a valid row has been found to prevent the display of the message when a row has been found.

Here is the revised code for doing it with a button.
Note this code is different from my previous post as it takes into account your code specification that only 1 cell needs to be checked - not the entire row. In your code you check cell 1 - in my sample it is cell 0.

<script>
var tbl = document.getElementById('myTable');
var norows = document.getElementById('no-rows-alert');
document.getElementById('myButton').addEventListener('click', function() {
  var matchedRow = false;
  var srch = $('#myInput').val().toUpperCase();
  for(var r = 0; r < tbl.rows.length; r++) {
    var row = tbl.rows[r];
	var cell = row.cells[0];
    var cellVal = cell.textContent.substr(0, srch.length).toUpperCase();
    if (srch == cellVal) {
        matchedRow = true;
		row.style.display = 'table-row';
    }
	else {
		row.style.display = 'none';
	}
  }
  
  norows.style.display = matchedRow ? 'none' : 'inherit';
  if (!matchedRow) {
    setTimeout(function() {
      norows.style.display = 'none'
    }, 1500)
  }
});
</script>

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Working sample here

Hi Julian, I really appreciated the way you anticipate the problem and I really love your solution as well. As I tried running your codes its work very fine. However, on the other side of my project I've got a problem. A cloneNode table your codes won't work anymore. Here's what my project goes. I have two tables, named, myTable and myTable2. I copy a data from Mytable2 to myTable using cloneNode then do certain search using your codes. In here the codes you provided will no longer work. Its very hard for me to trace the cause. I attached here the codes to make you understand. Thank you!
samt.html

Thank you very much Julian, Your solution is working very well. More power !

Thank you so much both of you, experts, more power and God bless!

You are welcome.