Javascript counting checkboxes not working – Blancer.com Tutorials and projects

the following Javascript code works in counting how many checkboxes are checked and highlights the row in orange:

function countCheckboxes() {
    var form = document.getElementById('frmAds');
    var count = 0;
    for (var n = 0; n < form.length; n++) {
      if (form[n].name === `chk[${n+1}]` && form[n].checked) {
        count++;
      }
    }

    document.getElementById('checkCount').innerHTML = " <b>" + count + "</b> rows are checked";
  }



    function toggleColour(obj,col)
    {
        col=col||'transparent'
        var row = findParentRow(obj);
        if (!row.col) row.col=row.style.backgroundColor;
        row.style.backgroundColor = obj.checked ? row.col : col; 
        
        countCheckboxes(); // Update the count when checkbox is clicked
    }
    function findParentRow(obj)
    {
        var tmp = obj.parentNode;
        if(tmp.nodeName.toLowerCase() != "tr")
        {
            tmp = findParentRow(tmp);
        }
        return tmp;
        
        
    }

window.onload = countCheckboxes;

<form action="import.php" enctype="multipart/form-data" method="post" id="frmAds">
  <table>
    <tr>
      <td>
        <input type="checkbox" value="1" name="chk[1]" checked="checked" onClick="toggleColour(this,'#FEAB2F');" />
      </td>
      <td>test 1</td>
    </tr>
    <tr>
      <td>
        <input type="checkbox" value="1" name="chk[2]" checked="checked" onClick="toggleColour(this,'#FEAB2F');" />
      </td>
      <td>test 2</td>
    </tr>
    <tr style="background-color:white;">
                 <td class="bigtext"><input type="checkbox" value="1" name="chk[3]" checked="checked" onClick="toggleColour(this,'#FEAB2F');" /></td>
                 <td class="bigtext">1</td>
                 <td class=" bigtext"><input type="hidden" value="03/28/2025" name="date[1]" />03/28/2025</td>
                 <td class="bigtext"><input type="text" size="56" value="Chase - IN *CARTERS TOWING AND RE" name="desc[1]" maxlength="190" style="border: none; padding: 4px; font-size: 12px;" /></td>
                 <td class="bigtext"><select name="cat[1]"><option value="1" selected="selected">(**NO MATCH**)</option><option value="829">(Work) Hotel Stay</option><option value="818">(Work) Uber and Taxi</option><option value="45">Accountant</option><option value="850">Addon Asset</option><option value="2">Bank Dividends</option><option value="3">Bank Interest</option><option value="16">Business Local Taxes</option><option value="821">Cashback Reward</option><option value="864">Commissions &amp; Fees</option><option value="70">DELETE THIS?</option><option value="55">Dental</option><option value="872">Ebay Items</option><option value="50">Estimated Taxes</option><option value="18">Health Insurance</option><option value="53">Medical Services</option><option value="7">Mobile Internet</option><option value="861">Office Rent</option><option value="78">OTR MEALS - Dining</option><option value="81">OTR Meals - Fast Food</option><option value="855">Personal - Air Travel</option><option value="67">Personal - ATM</option><option value="866">Personal - Bank Fees</option><option value="843">Personal - Bug Prevention</option><option value="75">Personal - Car Insurance</option><option value="845">Personal - Car Loan</option><option value="69">Personal - Car Maintenance</option><option value="847">Personal - Car Upgrades</option><option value="72">Personal - Car Wash</option><option value="66">Personal - Clothing</option><option value="61">Personal - Dining</option><option value="89">Personal - Dry Cleaners</option><option value="92">Personal - Electric Bill</option><option value="84">Personal - Entertainment</option><option value="62">Personal - Fast Food</option><option value="867">Personal - Fundrise Investment</option><option value="60">Personal - Gasoline</option><option value="63">Personal - Groceries</option><option value="64">Personal - Haircuts</option><option value="814">Personal - Home Insurance</option><option value="68">Personal - Home Items</option><option value="863">Personal - Home Maintenance</option><option value="94">Personal - Home Security</option><option value="811">Personal - Interest Payments</option><option value="83">Personal - Landscaping</option><option value="71">Personal - Licenses</option><option value="95">Personal - Local Internet</option><option value="97">Personal - Mailbox</option><option value="844">Personal - Miscellaneous</option><option value="76">Personal - Mortgage</option><option value="876">Personal - Mutual Funds</option><option value="862">Personal - Natural Gas</option><option value="857">Personal - Phone Apps</option><option value="819">Personal - Rental Car</option><option value="65">Personal - Shopping</option><option value="873">Personal - Transfers</option><option value="46">Personal - Trash Disposal</option><option value="851">Personal - Truck Upgrades</option><option value="827">Personal - Uber and Taxi</option><option value="885">Personal - Umbrella</option><option value="93">Personal - Water Bill</option><option value="98">Personal - Web Hosting</option><option value="90">Personal - Wine</option><option value="21">PO Box</option><option value="54">Prescriptions</option><option value="813">Property Taxes</option><option value="822">Refunds</option><option value="874">SBA Loan</option><option value="840">State Permits</option><option value="878">Trailer Repair</option><option value="839">Truck 2290</option><option value="849">Truck DACH</option><option value="824">Truck Fuel</option><option value="836">Truck IFTA</option><option value="830">Truck Insurance</option><option value="875">Truck Lumpers</option><option value="832">Truck Maintenance</option><option value="858">Truck Parking</option><option value="834">Truck Payment</option><option value="831">Truck Repairs</option><option value="838">Truck SCAC</option><option value="826">Truck Software</option><option value="58">Truck Supplies</option><option value="833">Truck Tolls</option><option value="837">Truck UCR</option><option value="825">Truck Wash</option><option value="86">W2 Payroll (After Tax)</option></select></td>
                 <td class="bigtext" nowrap><input type="hidden" value="-350.00" name="amount[1]" /><font color="red">$-350.00</font>
                 </td>
                 
                </tr>
    <tr>
      <td>
        <p id="checkCount"> </p>
      </td>
    </tr>
  </table>
</form>

The weird problem is when I add this code to my main site where all of the rows are like the bottom one, it doesn’t work at all. I manually tried removing everything one by one to see what the problem is, and it seems to work once I delete the select and input fields other than the chk checkbox field. Here is the version that doesn’t work:

function countCheckboxes() {
    var form = document.getElementById('frmAds');
    var count = 0;
    for (var n = 0; n < form.length; n++) {
      if (form[n].name === `chk[${n+1}]` && form[n].checked) {
        count++;
      }
    }

    document.getElementById('checkCount').innerHTML = " <b>" + count + "</b> rows are checked";
  }



    function toggleColour(obj,col)
    {
        col=col||'transparent'
        var row = findParentRow(obj);
        if (!row.col) row.col=row.style.backgroundColor;
        row.style.backgroundColor = obj.checked ? row.col : col; 
        
        countCheckboxes(); // Update the count when checkbox is clicked
    }
    function findParentRow(obj)
    {
        var tmp = obj.parentNode;
        if(tmp.nodeName.toLowerCase() != "tr")
        {
            tmp = findParentRow(tmp);
        }
        return tmp;
        
        
    }

window.onload = countCheckboxes;

<form action="import.php" enctype="multipart/form-data" method="post" id="frmAds">
  <table>
   <tr style="background-color:white;">
                 <td class="bigtext"><input type="checkbox" value="1" name="chk[1]" checked="checked" onClick="toggleColour(this,'#FEAB2F');" /></td>
                 <td class="bigtext">1</td>
                 <td class=" bigtext"><input type="hidden" value="03/28/2025" name="date[1]" />03/28/2025</td>
                 <td class="bigtext"><input type="text" size="56" value="CARTERS" name="desc[1]" maxlength="190" style="border: none; padding: 4px; font-size: 12px;" /></td>
                 <td class="bigtext"><select name="cat[1]"><option value="1" selected="selected">(**NO MATCH**)</option><option value="829">(Work) Hotel Stay</option><option value="818">(Work) Uber and Taxi</option><option value="45">Accountant</option><option value="850">Addon Asset</option><option value="2">Bank Dividends</option><option value="3">Bank Interest</option><option value="16">Business Local Taxes</option><option value="821">Cashback Reward</option><option value="864">Commissions &amp; Fees</option><option value="70">DELETE THIS?</option><option value="55">Dental</option><option value="872">Ebay Items</option><option value="50">Estimated Taxes</option><option value="18">Health Insurance</option><option value="53">Medical Services</option><option value="7">Mobile Internet</option><option value="861">Office Rent</option><option value="78">OTR MEALS - Dining</option><option value="81">OTR Meals - Fast Food</option><option value="855">Personal - Air Travel</option><option value="67">Personal - ATM</option><option value="866">Personal - Bank Fees</option><option value="843">Personal - Bug Prevention</option><option value="75">Personal - Car Insurance</option><option value="845">Personal - Car Loan</option><option value="69">Personal - Car Maintenance</option><option value="847">Personal - Car Upgrades</option><option value="72">Personal - Car Wash</option><option value="66">Personal - Clothing</option><option value="61">Personal - Dining</option><option value="89">Personal - Dry Cleaners</option><option value="92">Personal - Electric Bill</option><option value="84">Personal - Entertainment</option><option value="62">Personal - Fast Food</option><option value="867">Personal - Fundrise Investment</option><option value="60">Personal - Gasoline</option><option value="63">Personal - Groceries</option><option value="64">Personal - Haircuts</option><option value="814">Personal - Home Insurance</option><option value="68">Personal - Home Items</option><option value="863">Personal - Home Maintenance</option><option value="94">Personal - Home Security</option><option value="811">Personal - Interest Payments</option><option value="83">Personal - Landscaping</option><option value="71">Personal - Licenses</option><option value="95">Personal - Local Internet</option><option value="97">Personal - Mailbox</option><option value="844">Personal - Miscellaneous</option><option value="76">Personal - Mortgage</option><option value="876">Personal - Mutual Funds</option><option value="862">Personal - Natural Gas</option><option value="857">Personal - Phone Apps</option><option value="819">Personal - Rental Car</option><option value="65">Personal - Shopping</option><option value="873">Personal - Transfers</option><option value="46">Personal - Trash Disposal</option><option value="851">Personal - Truck Upgrades</option><option value="827">Personal - Uber and Taxi</option><option value="885">Personal - Umbrella</option><option value="93">Personal - Water Bill</option><option value="98">Personal - Web Hosting</option><option value="90">Personal - Wine</option><option value="21">PO Box</option><option value="54">Prescriptions</option><option value="813">Property Taxes</option><option value="822">Refunds</option><option value="874">SBA Loan</option><option value="840">State Permits</option><option value="878">Trailer Repair</option><option value="839">Truck 2290</option><option value="849">Truck DACH</option><option value="824">Truck Fuel</option><option value="836">Truck IFTA</option><option value="830">Truck Insurance</option><option value="875">Truck Lumpers</option><option value="832">Truck Maintenance</option><option value="858">Truck Parking</option><option value="834">Truck Payment</option><option value="831">Truck Repairs</option><option value="838">Truck SCAC</option><option value="826">Truck Software</option><option value="58">Truck Supplies</option><option value="833">Truck Tolls</option><option value="837">Truck UCR</option><option value="825">Truck Wash</option><option value="86">W2 Payroll (After Tax)</option></select></td>
                 <td class="bigtext" nowrap><input type="hidden" value="-350.00" name="amount[1]" /><font color="red">$-350.00</font>
                </td>
                
                </tr><tr style="background-color:white;">
                 <td class="bigtext"><input type="checkbox" value="1" name="chk[2]" checked="checked" onClick="toggleColour(this,'#FEAB2F');" /></td>
                 <td class="bigtext">2</td>
                 <td class=" bigtext"><input type="hidden" value="03/28/2025" name="date[2]" />03/28/2025</td>
                 <td class="bigtext"><input type="text" size="56" value="EXXON" name="desc[2]" maxlength="190" style="border: none; padding: 4px; font-size: 12px;" /></td>
                 <td class="bigtext"><select name="cat[2]"><option value="81" selected="selected">OTR Meals - Fast Food</option><option value="829">(Work) Hotel Stay</option><option value="818">(Work) Uber and Taxi</option><option value="45">Accountant</option><option value="850">Addon Asset</option><option value="2">Bank Dividends</option><option value="3">Bank Interest</option><option value="16">Business Local Taxes</option><option value="821">Cashback Reward</option><option value="864">Commissions &amp; Fees</option><option value="70">DELETE THIS?</option><option value="55">Dental</option><option value="872">Ebay Items</option><option value="50">Estimated Taxes</option><option value="18">Health Insurance</option><option value="53">Medical Services</option><option value="7">Mobile Internet</option><option value="861">Office Rent</option><option value="78">OTR MEALS - Dining</option><option value="81">OTR Meals - Fast Food</option><option value="855">Personal - Air Travel</option><option value="67">Personal - ATM</option><option value="866">Personal - Bank Fees</option><option value="843">Personal - Bug Prevention</option><option value="75">Personal - Car Insurance</option><option value="845">Personal - Car Loan</option><option value="69">Personal - Car Maintenance</option><option value="847">Personal - Car Upgrades</option><option value="72">Personal - Car Wash</option><option value="66">Personal - Clothing</option><option value="61">Personal - Dining</option><option value="89">Personal - Dry Cleaners</option><option value="92">Personal - Electric Bill</option><option value="84">Personal - Entertainment</option><option value="62">Personal - Fast Food</option><option value="867">Personal - Fundrise Investment</option><option value="60">Personal - Gasoline</option><option value="63">Personal - Groceries</option><option value="64">Personal - Haircuts</option><option value="814">Personal - Home Insurance</option><option value="68">Personal - Home Items</option><option value="863">Personal - Home Maintenance</option><option value="94">Personal - Home Security</option><option value="811">Personal - Interest Payments</option><option value="83">Personal - Landscaping</option><option value="71">Personal - Licenses</option><option value="95">Personal - Local Internet</option><option value="97">Personal - Mailbox</option><option value="844">Personal - Miscellaneous</option><option value="76">Personal - Mortgage</option><option value="876">Personal - Mutual Funds</option><option value="862">Personal - Natural Gas</option><option value="857">Personal - Phone Apps</option><option value="819">Personal - Rental Car</option><option value="65">Personal - Shopping</option><option value="873">Personal - Transfers</option><option value="46">Personal - Trash Disposal</option><option value="851">Personal - Truck Upgrades</option><option value="827">Personal - Uber and Taxi</option><option value="885">Personal - Umbrella</option><option value="93">Personal - Water Bill</option><option value="98">Personal - Web Hosting</option><option value="90">Personal - Wine</option><option value="21">PO Box</option><option value="54">Prescriptions</option><option value="813">Property Taxes</option><option value="822">Refunds</option><option value="874">SBA Loan</option><option value="840">State Permits</option><option value="878">Trailer Repair</option><option value="839">Truck 2290</option><option value="849">Truck DACH</option><option value="824">Truck Fuel</option><option value="836">Truck IFTA</option><option value="830">Truck Insurance</option><option value="875">Truck Lumpers</option><option value="832">Truck Maintenance</option><option value="858">Truck Parking</option><option value="834">Truck Payment</option><option value="831">Truck Repairs</option><option value="838">Truck SCAC</option><option value="826">Truck Software</option><option value="58">Truck Supplies</option><option value="833">Truck Tolls</option><option value="837">Truck UCR</option><option value="825">Truck Wash</option><option value="86">W2 Payroll (After Tax)</option></select></td>
                 <td class="bigtext" nowrap><input type="hidden" value="-4.63" name="amount[2]" /><font color="red">$-4.63</font>
                </td>
                
                </tr><tr style="background-color:white;">
                 <td class="bigtext"><input type="checkbox" value="1" name="chk[3]" checked="checked" onClick="toggleColour(this,'#FEAB2F');" /></td>
                 <td class="bigtext">3</td>
                 <td class=" bigtext"><input type="hidden" value="03/28/2025" name="date[3]" />03/28/2025</td>
                 <td class="bigtext"><input type="text" size="56" value="VTC SERVICE" name="desc[3]" maxlength="190" style="border: none; padding: 4px; font-size: 12px;" /></td>
                 <td class="bigtext"><select name="cat[3]"><option value="1" selected="selected">(**NO MATCH**)</option><option value="829">(Work) Hotel Stay</option><option value="818">(Work) Uber and Taxi</option><option value="45">Accountant</option><option value="850">Addon Asset</option><option value="2">Bank Dividends</option><option value="3">Bank Interest</option><option value="16">Business Local Taxes</option><option value="821">Cashback Reward</option><option value="864">Commissions &amp; Fees</option><option value="70">DELETE THIS?</option><option value="55">Dental</option><option value="872">Ebay Items</option><option value="50">Estimated Taxes</option><option value="18">Health Insurance</option><option value="53">Medical Services</option><option value="7">Mobile Internet</option><option value="861">Office Rent</option><option value="78">OTR MEALS - Dining</option><option value="81">OTR Meals - Fast Food</option><option value="855">Personal - Air Travel</option><option value="67">Personal - ATM</option><option value="866">Personal - Bank Fees</option><option value="843">Personal - Bug Prevention</option><option value="75">Personal - Car Insurance</option><option value="845">Personal - Car Loan</option><option value="69">Personal - Car Maintenance</option><option value="847">Personal - Car Upgrades</option><option value="72">Personal - Car Wash</option><option value="66">Personal - Clothing</option><option value="61">Personal - Dining</option><option value="89">Personal - Dry Cleaners</option><option value="92">Personal - Electric Bill</option><option value="84">Personal - Entertainment</option><option value="62">Personal - Fast Food</option><option value="867">Personal - Fundrise Investment</option><option value="60">Personal - Gasoline</option><option value="63">Personal - Groceries</option><option value="64">Personal - Haircuts</option><option value="814">Personal - Home Insurance</option><option value="68">Personal - Home Items</option><option value="863">Personal - Home Maintenance</option><option value="94">Personal - Home Security</option><option value="811">Personal - Interest Payments</option><option value="83">Personal - Landscaping</option><option value="71">Personal - Licenses</option><option value="95">Personal - Local Internet</option><option value="97">Personal - Mailbox</option><option value="844">Personal - Miscellaneous</option><option value="76">Personal - Mortgage</option><option value="876">Personal - Mutual Funds</option><option value="862">Personal - Natural Gas</option><option value="857">Personal - Phone Apps</option><option value="819">Personal - Rental Car</option><option value="65">Personal - Shopping</option><option value="873">Personal - Transfers</option><option value="46">Personal - Trash Disposal</option><option value="851">Personal - Truck Upgrades</option><option value="827">Personal - Uber and Taxi</option><option value="885">Personal - Umbrella</option><option value="93">Personal - Water Bill</option><option value="98">Personal - Web Hosting</option><option value="90">Personal - Wine</option><option value="21">PO Box</option><option value="54">Prescriptions</option><option value="813">Property Taxes</option><option value="822">Refunds</option><option value="874">SBA Loan</option><option value="840">State Permits</option><option value="878">Trailer Repair</option><option value="839">Truck 2290</option><option value="849">Truck DACH</option><option value="824">Truck Fuel</option><option value="836">Truck IFTA</option><option value="830">Truck Insurance</option><option value="875">Truck Lumpers</option><option value="832">Truck Maintenance</option><option value="858">Truck Parking</option><option value="834">Truck Payment</option><option value="831">Truck Repairs</option><option value="838">Truck SCAC</option><option value="826">Truck Software</option><option value="58">Truck Supplies</option><option value="833">Truck Tolls</option><option value="837">Truck UCR</option><option value="825">Truck Wash</option><option value="86">W2 Payroll (After Tax)</option></select></td>
                 <td class="bigtext" nowrap><input type="hidden" value="-1970.07" name="amount[3]" /><font color="red">$-1970.07</font>
                </td>
                
                </tr>
    <tr>
      <td>
        <p id="checkCount"> </p>
      </td>
    </tr>
  </table>
</form>

Any idea how to fix this?