notify-slack-on-google-form-submit.gs

function setUpTrigger(){
  ScriptApp.newTrigger('submit').forForm('Your Google Form ID').onFormSubmit().create();
}

function submit(event) {
  var itemResponses = event.response.getItemResponses();

  var order = '';
  var firstName = '';
  var lastName = '';

  for (var i = 0; i < itemResponses.length; i++) {
    var itemResponse = itemResponses[i];
    var question = itemResponse.getItem().getTitle();
    var type = itemResponse.getItem().getType();
    var answer = itemResponse.getResponse();
    if (question === 'お名前（姓）をご入力ください'){
      lastName = answer;
    }
    else if (question === 'お名前（名）をご入力ください') {
      firstName = answer;
    }

    if(type == 'GRID'){ // typeはEnumのため比較演算子を使う
      var rows = itemResponse.getItem().asGridItem().getRows();
      for(var j = 0; j < rows.length; j++){
        var titleRow = rows[j];
        var answerCol = answer[j];
        order += titleRow + ' : ' + answerCol + '\n';
      }
    }        
  }

  var message = order 
  message += '名前: ' + lastName + firstName + JSON.stringify(getItemSummary(event));
  notifySlack({ message: message })
}

// 回答したフォームに配置されているアイテム全てをオブジェクトに変換する
function getItemSummary(event) {
  var items = event.source.getItems();

  var sourceSummary = [];

  for (var i = 0; i < items.length; i++) {
    var item = items[i]
    var title = item.getTitle();
    var type = item.getType() + '';
    var helpText = item.getHelpText();

    var summary = {
      title: title,
      type: type,
      helpText: helpText,
    }

    sourceSummary.push(summary)
  }
  return sourceSummary
}


function notifySlack(opt) {
  var WEBHOOK_URL = ''; // Slackで取得したweb hook url
  var options = opt || {}
  var jsonData = {
    "username": options.botName || '通知',
    "text": options.message || "送信テスト",
    "icon_emoji": options.botIcon || ':bird:'
  };
  var payload = JSON.stringify(jsonData);
  UrlFetchApp.fetch(WEBHOOK_URL, {"method": "post", "payload": payload});
}

// Useful Links
// https://www.youtube.com/watch?v=vYQE9ltt2Yg
// https://qiita.com/harhogefoo/items/6b20ed9e6779c3d4c48d