Build a row within an HTML table that is devoid of both an ID and a class

Creating an additional row in an HTML table is a common task, but it can become tricky when dealing with multiple forms and tables on one page. In my case, I have a form that contains only a table element, and I want to move some columns from the first row to a newly created row.

<h:form id="myForm">
    <table>
        <tr>
            <td id="col1">Item Info</td>
            <td id="col2">Description</td>
            <td id="col3">Product</td>
            <td id="col4">Keywords</td>      
            <td id="col5">Documents</td>
            <td id="col6">Image</td>
            <td id="col7">Video</td>                
       </tr>
    </table>    
</h:form>

The current output looks like: Item Info Description Product Keywords Documents Image Video

But I am aiming for something like this:

Item Info Description Product Keywords
NEW CELL1 Documents Image Video

This involves removing certain columns from the existing row and adding them to a new row. To achieve this, I've written a JavaScript function:

<script type="text/javascript">

window.onload = function() {
    split();
};

function split() {          

    var form = document.getElementById("myForm");       
    var table = form.getElementsByTagName("table")[0];
    var tr = document.createElement("tr");
    tr.id="row2";
    table.appendChild(tr);
  
    // Moving desired columns to the new row
    var cell = tr.insertCell(0);
    cell.innerHTML = "NEW CELL1";
    var col5 = document.getElementById("col5");
    tr.appendChild(col5);
    var col6 = document.getElementById("col6");
    tr.appendChild(col6);
    var col7 = document.getElementById("col7");
    tr.appendChild(col7);           
}   

</script>

My issue lies in dynamically generating the form since I can't assign IDs to elements. The script fails to find the table when using form.elements[0], as I need a more robust method to locate the table element for row creation.

I'm seeking a way to reliably target the table element to add a row within it.

Answer ā„–1

If you're looking for the table, try this method:

  • Start with an element in a table row and work your way up the parent nodes until you reach the table. For example, use
    document.getElementById('col1').parentNode.parentNode

For added convenience,

  • To add a new row after a table cell, simply insert the string '</tr><tr>'.

This approach is preferable to using

document.getElementsByTagName('table')
because searching through a large array of tables can be time-consuming if they are spread far apart.

Answer ā„–2

To retrieve the table within your form that has an ID, utilize the getElementsByTagName method.

window.onload = function() {
  split();
};

function split() {

  var form = document.getElementById("myForm");
  var table = form.getElementsByTagName("table")[0];


  var tr = document.createElement("tr");
  tr.id = "row2";
  table.appendChild(tr);
  var cell = tr.insertCell(0);
  cell.innerHTML = "NEW CELL1";
  
  /*Avoid creating duplicate IDs by updating them with new identifiers*/
  var col5 = document.getElementById("col5");
  /*Update new Id*/
  col5.id += "_new";
  tr.appendChild(col5);
  var col6 = document.getElementById("col6");
  /*Update new Id*/
  col6.id += "_new";
  tr.appendChild(col6);
  var col7 = document.getElementById("col7");
  /*Update new Id*/
  col7.id += "_new";
  tr.appendChild(col7);
}
<form id="myForm">
  <table>
    <tr>
      <td id="col1">Item Info</td>
      <td id="col2">Description</td>
      <td id="col3">Product</td>
      <td id="col4">Keywords</td>
      <td id="col5">Documents</td>
      <td id="col6">Image</td>
      <td id="col7">Video</td>
    </tr>
  </table>
</form>

The provided code only inserts data into 4 out of the original 7 columns, causing a mismatch in column numbers. To ensure consistency, use the colspan attribute when necessary.

Answer ā„–3

To effectively remove specific table data from your document using JavaScript, utilize the querySelector method.

For example, you can use a code snippet like

var rowToDeleteOrAddTo = document.querySelector("#myForm > table > tr > td");
to achieve this task. Familiarize yourself with CSS Selectors in order to identify the right selectors for your needs. Additionally, make use of the textContent property once you've selected a node to ensure accuracy when removing elements.

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