add copy previous button in sublist of deposit record

Scenario: requesting the addition of a “Copy Previous” button in the Deposit record, which would allow for duplicating lines and simplifying the process of replicating previous entries without the need to manually re-enter the information.

basic script logic in pageInit:

• Wait for UI load: The script waits a short time after the page opens so the sublist buttons (Add, Cancel, etc.) are fully rendered.
• Find the right spot: It locates the HTML element for the “Remove” button and finds the row (<tr>) that holds all line-level buttons.
• Create the new button: It builds a new button (Copy Previous) using the same structure and style NetSuite uses for its buttons.
• Insert the button inline: The new button is inserted right after “Remove”, keeping it on the same line as Add/Cancel/Insert/Remove.
• Add click functionality: When clicked, the script reads data from the previous line, copies those values, and adds them to a new line.
• Show confirmation: A message pops up confirming that the line was copied successfully.

Script:

/**
 * @NApiVersion 2.1
 * @NScriptType ClientScript
 */
define([‘N/currentRecord’, ‘N/ui/dialog’], (currentRecord, dialog) => {
 const sublistId = ‘other’;
 const pageInit = () => {
  try {
   // Wait for NetSuite to render toolbar fully
   setTimeout(() => injectCopyButton(), 1200);
  } catch (err) {
   console.error(‘Error injecting Copy Previous button:’, err);
  }
 };
 const injectCopyButton = () => {
  const removeTable = document.getElementById(`tbl_${sublistId}_remove`);
  if (!removeTable) {
   console.warn(‘Remove button table not found for sublist:’, sublistId);
   return;
  }
  // Avoid duplicate injection
  if (document.getElementById(`tbl_${sublistId}_copy`)) return;
  // Go one level up — to the <td> containing “Remove” and then its parent <tr>
  const removeTd = removeTable.closest(‘td’);
  const buttonsRow = removeTd?.parentNode; // <tr> element that holds all <td> buttons
  if (!buttonsRow) {
   console.warn(‘Could not locate button row container.’);
   return;
  }
  // Create a new <td> with full NetSuite button structure
  const td = document.createElement(‘td’);
  td.innerHTML = `
   <table class=”machBnt” id=”tbl_${sublistId}_copy” cellpadding=”0? cellspacing=”0? border=”0? role=”presentation”>
    <tbody>
     <tr><td class=”bntTop”><img src=”/images/nav/ns_x.gif” width=”1? height=”3? alt=””></td></tr>
     <tr>
      <td class=”uir-copy bntBg” valign=”top”>
       <input type=”button”
           class=”nlinlineeditbutton bntBgT”
           id=”custpage_copy_prev_linebtn”
           value=”Copy Previous”
           style=”font-weight: 500;”>
      </td>
     </tr>
     <tr><td class=”bntBot”><img src=”/images/nav/ns_x.gif” width=”1? height=”3? alt=””></td></tr>
    </tbody>
   </table>
  `;
  // Insert our new button <td> right after the <td> that holds Remove
  buttonsRow.insertBefore(td, removeTd.nextSibling);
  // Attach click logic
  const copyBtn = td.querySelector(‘#custpage_copy_prev_linebtn’);
  copyBtn.onclick = () => copyPreviousLine();
  console.log(‘Copy Previous button injected after Remove’);
 };
 const copyPreviousLine = () => {
  const rec = currentRecord.get();
  const lineCount = rec.getLineCount({ sublistId });
  if (lineCount < 1) {
   dialog.alert({ title: ‘Notice’, message: ‘No previous line found to copy.’ });
   return;
  }
  const lastLine = lineCount – 1;
  const fieldsToCopy = [
   ‘entity’, ‘account’, ‘paymentmethod’, ‘amount’,
   ‘department’, ‘class’, ‘location’, ‘memo’
  ];
  rec.selectNewLine({ sublistId });
  fieldsToCopy.forEach((fieldId) => {
   try {
    const value = rec.getSublistValue({ sublistId, fieldId, line: lastLine });
    if (value !== null && value !== undefined && value !== ”) {
     rec.setCurrentSublistValue({ sublistId, fieldId, value });
    }
   } catch (e) {
    console.warn(`Skipping field ${fieldId}: ${e.message}`);
   }
  });
  rec.commitLine({ sublistId });
  dialog.alert({
   title: ‘Success’,
   message: ‘Previous line copied successfully.’
  });
 };
 return { pageInit };
});