Check out example codes for "html table filter by all columns". It will help you in understanding the concepts better.

Code Example 1

<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search for names.." title="Type in a name">

<table id="myTable" border="1">
  <tr class="header">
    <th style="width:60%;">Name</th>
    <th style="width:40%;">Country</th>
  </tr>
  <tr>
    <td>Alfreds Futterkiste</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Berglunds snabbkop</td>
    <td>Sweden</td>
  </tr>
  <tr>
    <td>Island Trading</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Koniglich Essen</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Laughing Bacchus Winecellars</td>
    <td>Canada</td>
  </tr>
  <tr>
    <td>Magazzini Alimentari Riuniti</td>
    <td>Italy</td>
  </tr>
  <tr>
    <td>North/South</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Paris specialites</td>
    <td>France</td>
  </tr>
</table>

Code Example 2

function myFunction() {
  var input, filter, table, tr, td, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  table = document.getElementById("myTable");
  var rows = table.getElementsByTagName("tr");
  for (i = 0; i < rows.length; i++) {
    var cells = rows[i].getElementsByTagName("td");
    var j;
    var rowContainsFilter = false;
    for (j = 0; j < cells.length; j++) {
      if (cells[j]) {
        if (cells[j].innerHTML.toUpperCase().indexOf(filter) > -1) {
          rowContainsFilter = true;
          continue;
        }
      }
    }

    if (! rowContainsFilter) {
      rows[i].style.display = "none";
    } else {
      rows[i].style.display = "";
    }
  }
}

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