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google.script.run problem on Google Apps Script

I am working on a Google Apps Script project, and I have made a html form that will automatically paste the user answers in a sheet.

My problem is the following: I need to add elements in a drop down list with a separated form. To do this, I have made a function that will read some cells and add their value in a “list”. I joined that list to return a string named listVlans.

This is my GS:

function returnList() {
  let ss = SpreadsheetApp.getActive();
  let VLANS = ss.getSheetByName("VLANS");
  let list = VLANS.getRange(3, 9, VLANS.getLastRow() - 2, 1).getValues();
  let listVlans = list.join();
  return listVlans;
}

There is no problem here, it returns a big string (listVlans) with all the elements of my list separated by ,.

My problem is that I would like to import this listVlans from the .gs to my html script to actualize my drop down list elements in function of my sheet’s values.

<script>
    function getList()
    {
      let newList = google.script.run.returnList();
      console.log(newList);
    }
</script>

The problem is that the console.log(newList) is just printing undefined, but it should print my big joined string…

Have you had this problem? Thank you.

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Answer

Welcome Thibaud, the problem is not here, you have to evaluate your form by a script included in gs like this one (change names as necessary, inside this script)

function lister() {
  const html = HtmlService
    .createTemplateFromFile('formList')
    .evaluate();
  SpreadsheetApp.getUi().showModelessDialog(html, 'Lister ...');
}
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