从 HTML 输入返回应用程序脚本中的数据

我正在尝试使用 HTMLService 从 google 电子表格启动 html 表单，并将数据从选择输入返回到脚本。我正在用这一行收集数据： -

但我不确定如何将其返回到脚本文件：我尝试了以下各种迭代： - 城市= form.Projects_list.text; - 城市= form.Projects_list[0]; - 城市= form.Projects_list.[0][0];

但这些似乎都不是选择的正确句柄。其他变量根据需要从表单中返回。

我怎样才能获取最后一个变量？

HTML 文件

<b>Add Row To Spreadsheet</b><br />

    <form>

  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>jQuery UI Datepicker - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
  <script>
  $( function() {
    $( "#datepicker" ).datepicker();
  } );

  $( function() {
    $( ".widget input[type=submit]" ).button();
    $( "button, input, a" ).click( function( event ) {
      event.preventDefault();
    } );
  } );
  </script>


 <form id = "dateform">
 <p>Date: <input type="text" id="datepicker" name ="datepicker"></p><p></p>
    Reason for Delay: <input id="reason" name="reason" type="text" />

    Last name: <input id="lastName" name="lastName" type="text" />

   <input onclick="formSubmit()" type="button" value="Add Row" />
   <input onclick="google.script.host.close()" type="button" value="Exit" />

  <hr>
  <div id = 'pList'>

    <table>
      <tr>
        <td>Select A City</td><td><select id="Projects_list"name ="Projects_list"></select></td>
      </tr>

    </table>
   </div>


   </form>
   <script type="text/javascript">
        function formSubmit() {
            google.script.run.getValuesFromForm(document.forms[0]);
            google.script.host.close();
        }

  </script> 
  <script type="text/javascript">

    // Client-side JavaScript that uses the list returned by
    // GAS function "getValuesForRngName()" to populate the dropdown.
    // This is standard client-side JavaScript programming that uses
    // DOM manipulation to get page elements and manipulate them.
    function onSuccess(values) {
      var opt,
          dropDown;
        for(i = 0;i < values.length; i +=1){
          dropDown = document.getElementById("Projects_list");
          opt = document.createElement("option");
          dropDown.options.add(opt);
          // Remember that GAS Range method "GetValues()" returns
          // an array of arrays, hence two array indexes "[i][0]" here.
          opt.text = values[i][0];
          opt.value = values[i][0];

       }
    }
    function populate(){
      google.script.run.withSuccessHandler(onSuccess).getValuesForRngName('Projects20');
    }
  </script>
  <script>
    // Using the "load" event to execute the function "populate"
    window.addEventListener('load', populate);

  </script>

  <script>
    // Client-side JavaScript that uses the list returned by
    // GAS function "getValuesForRngName()" to populate the dropdown.
    // This is standard client-side JavaScript programming that uses
    // DOM manipulation to get page elements and manipulate them.
    function onSuccessx(values) {
      var opt,
          dropDown;
        for(i = 0;i < values.length; i +=1){
          dropDown = document.getElementById("Projects_list");
          opt = document.createElement("option");
          dropDown.options.add(opt);
          // Remember that GAS Range method "GetValues()" returns
          // an array of arrays, hence two array indexes "[i][0]" here.
          opt.text = values[i][0];
          opt.value = values[i][0];
       }
       dropDown = dropDown.options.sort()
    }
    function populatex(){
      google.script.run.withSuccessHandler(onSuccess).getValuesForRngName('Projects20');
    }
  </script>
  <script>
    // Using the "load" event to execute the function "populate"
    window.addEventListener('loadx', populate);
  </script>

应用程序脚本文件

function demoHtmlServices() {
  var ss = SpreadsheetApp.getActiveSpreadsheet(),
      html = HtmlService.createHtmlOutputFromFile('changeDateHTML');
  setRngName();
  ss.show(html);

}

//getValuesFromForm
function getValuesFromForm(form){
  var firstName = form.firstName,
      lastName = form.lastName,
      reason = form.reason,
      newDate = form.datepicker,
      city= form.Projects_list.text;
      sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  SpreadsheetApp.getUi().alert('Test');
  sheet.appendRow([lastName, reason, newDate, city]);
  var ui = SpreadsheetApp.getUi() ;
  alert('Test');
  ui.alert('form.Projects_list(0)')

  google.script.host.close();
  }

// Display the GUI
// Execute this function from the script editor ro run the application.
// Note the call to "setRngName()". This ensures that all newly added
// values are included in the dropdown list when the GUI is displayed
function displayGUI() {
  var ss,
      html;
  setRngName();
  ss = SpreadsheetApp.getActiveSpreadsheet();
  html = HtmlService.createHtmlOutputFromFile('index').setSandboxMode(HtmlService.SandboxMode.IFRAME);
  ss.show(html);
}
// Called by Client-side JavaScript in the index.html.
// Uses the range name argument to extract the values.
// The values are then sorted and returned as an array
// of arrays.
function getValuesForRngName(rngName) {
  var rngValues = SpreadsheetApp.getActiveSpreadsheet().getRangeByName(rngName).getValues();
  return rngValues.sort();
}

//Expand the range defined by the name as rows are added
function setRngName() {
  var ss = SpreadsheetApp.getActiveSpreadsheet(),
      sh = ss.getSheetByName('DropdownValues'),
      firstCellAddr = 'A2',
      dataRngRowCount = sh.getDataRange().getLastRow(),
      listRngAddr = (firstCellAddr + ':A' + dataRngRowCount),
      listRng = sh.getRange(listRngAddr);
  ss.setNamedRange('20Projects', listRng);
  //Logger.log(ss.getRangeByName('Cities').getValues());
}

// For debugging
function test_setRngName() {
  setRngName();
}

您可以使用 value 属性。

document.getElementById("Projects_list").value