如何用Martin Hawksey的Google Script实现读取表格主题列的无对话框邮件合并

要实现从Google Sheet的Subjectline列读取邮件主题并跳过弹窗，你需要对代码做以下几处关键修改：

1. 添加主题列与草稿模板常量 #

在现有常量定义区域，新增两个常量：一个对应表格中的主题列名，另一个对应作为内容模板的Gmail草稿主题：

const RECIPIENT_COL  = "Recipient";
const EMAIL_SENT_COL = "Email Sent";
const SUBJECT_COL = "Subjectline"; // 表格中主题列的名称
const DRAFT_TEMPLATE_SUBJECT = "邮件合并内容模板"; // 作为内容模板的Gmail草稿主题

2. 调整sendEmails函数参数与模板获取逻辑 #

移除原函数的subjectLine参数，改为使用固定的草稿主题获取邮件内容模板：

function sendEmails(sheet=SpreadsheetApp.getActiveSheet()) {
  // 保留你已经注释的Browser.inputBox代码
  
  // 使用固定草稿主题获取内容模板
  const emailTemplate = getGmailTemplateFromDrafts_(DRAFT_TEMPLATE_SUBJECT);
  
  // 后续原有数据读取逻辑保持不变

3. 修改邮件发送逻辑，使用表格中的主题 #

在循环发送邮件时，将邮件主题替换为当前行Subjectline列的值：

// 替换原GmailApp.sendEmail中的主题参数
GmailApp.sendEmail(row[RECIPIENT_COL], row[SUBJECT_COL], msgObj.text, {
  htmlBody: msgObj.html,
  attachments: emailTemplate.attachments,
  inlineImages: emailTemplate.inlineImages
});

完整修改后的代码 #

// To learn how to use this script, refer to the documentation:
// https://developers.google.com/apps-script/samples/automations/mail-merge

/*
Copyright 2022 Martin Hawksey

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
 
/**
 * @OnlyCurrentDoc
*/
 
/**
 * Change these to match the column names you are using for email 
 * recipient addresses and email sent column.
*/
const RECIPIENT_COL  = "Recipient";
const EMAIL_SENT_COL = "Email Sent";
const SUBJECT_COL = "Subjectline"; // 表格中主题列的名称
const DRAFT_TEMPLATE_SUBJECT = "邮件合并内容模板"; // 作为内容模板的Gmail草稿主题
 
/** 
 * Creates the menu item "Mail Merge" for user to run scripts on drop-down.
 */
function onOpen() {
  const ui = SpreadsheetApp.getUi();
  ui.createMenu('Mail Merge')
      .addItem('Send Emails', 'sendEmails')
      .addToUi();
}
 
/**
 * Sends emails from sheet data.
 * @param {Sheet} sheet to read data from
*/
function sendEmails(sheet=SpreadsheetApp.getActiveSheet()) {
  // option to skip browser prompt if you want to use this code in other projects
  /*
  if (!subjectLine){
    subjectLine = Browser.inputBox("Mail Merge", 
                                      "Type or copy/paste the subject line of the Gmail " +
                                      "draft message you would like to mail merge with:",
                                      Browser.Buttons.OK_CANCEL);
                                       
    if (subjectLine === "cancel" || subjectLine == ""){ 
    // If no subject line, finishes up
    return;
    }
  } */
  
  // Gets the draft Gmail message to use as a content template
  const emailTemplate = getGmailTemplateFromDrafts_(DRAFT_TEMPLATE_SUBJECT);
  
  // Gets the data from the passed sheet
  const dataRange = sheet.getDataRange();
  const data = dataRange.getDisplayValues();

  // Assumes row 1 contains our column headings
  const heads = data.shift(); 
  
  // Gets the index of the column named 'Email Status'
  const emailSentColIdx = heads.indexOf(EMAIL_SENT_COL);
  
  // Converts 2d array into an object array
  const obj = data.map(r => (heads.reduce((o, k, i) => (o[k] = r[i] || '', o), {})));

  // Creates an array to record sent emails
  const out = [];

  // Loops through all the rows of data
  obj.forEach(function(row, rowIdx){
    // Only sends emails if email_sent cell is blank and not hidden by a filter
    if (row[EMAIL_SENT_COL] == ''){
      try {
        const msgObj = fillInTemplateFromObject_(emailTemplate.message, row);

        // Send email with subject from sheet's Subjectline column
        GmailApp.sendEmail(row[RECIPIENT_COL], row[SUBJECT_COL], msgObj.text, {
          htmlBody: msgObj.html,
          // bcc: 'a.bbc@email.com',
          // cc: 'a.cc@email.com',
          // from: 'an.alias@email.com',
          // name: 'name of the sender',
          // replyTo: 'a.reply@email.com',
          // noReply: true, // if the email should be sent from a generic no-reply email address (not available to gmail.com users)
          attachments: emailTemplate.attachments,
          inlineImages: emailTemplate.inlineImages
        });
        // Edits cell to record email sent date
        out.push([new Date()]);
      } catch(e) {
        // modify cell to record error
        out.push([e.message]);
      }
    } else {
      out.push([row[EMAIL_SENT_COL]]);
    }
  });
  
  // Updates the sheet with new data
  sheet.getRange(2, emailSentColIdx+1, out.length).setValues(out);
  
  /**
   * Get a Gmail draft message by matching the subject line.
   * @param {string} subject_line to search for draft message
   * @return {object} containing the subject, plain and html message body and attachments
  */
  function getGmailTemplateFromDrafts_(subject_line){
    try {
      // get drafts
      const drafts = GmailApp.getDrafts();
      // filter the drafts that match subject line
      const draft = drafts.filter(subjectFilter_(subject_line))[0];
      // get the message object
      const msg = draft.getMessage();

      // Handles inline images and attachments so they can be included in the merge
      const allInlineImages = draft.getMessage().getAttachments({includeInlineImages: true,includeAttachments:false});
      const attachments = draft.getMessage().getAttachments({includeInlineImages: false});
      const htmlBody = msg.getBody(); 

      // Creates an inline image object with the image name as key 
      const img_obj = allInlineImages.reduce((obj, i) => (obj[i.getName()] = i, obj) ,{});

      //Regexp searches for all img string positions with cid
      const imgexp = RegExp('<img.*?src="cid:(.*?)" .*?alt="(.*?)"[^\>]+>', 'g');
      const matches = [...htmlBody.matchAll(imgexp)];

      //Initiates the allInlineImages object
      const inlineImagesObj = {};
      // built an inlineImagesObj from inline image matches
      matches.forEach(match => inlineImagesObj[match[1]] = img_obj[match[2]]);

      return {message: {subject: subject_line, text: msg.getPlainBody(), html:htmlBody}, 
              attachments: attachments, inlineImages: inlineImagesObj };
    } catch(e) {
      throw new Error("Oops - can't find Gmail draft");
    }

    /**
     * Filter draft objects with the matching subject line.
     * @param {string} subject_line to search for draft message
     * @return {object} GmailDraft object
    */
    function subjectFilter_(subject_line){
      return function(element) {
        if (element.getMessage().getSubject() === subject_line) {
          return element;
        }
      }
    }
  }
  
  /**
   * Fill template string with data object
   * @param {string} template string containing {{}} markers which are replaced with data
   * @param {object} data object used to replace {{}} markers
   * @return {object} message replaced with data
  */
  function fillInTemplateFromObject_(template, data) {
    let template_string = JSON.stringify(template);

    // Token replacement
    template_string = template_string.replace(/{{[^{}]+}}/g, key => {
      return escapeData_(data[key.replace(/[{}]+/g, "")] || "");
    });
    return  JSON.parse(template_string);
  }

  /**
   * Escape cell data to make JSON safe
   * @param {string} str to escape JSON special characters from
   * @return {string} escaped string
  */
  function escapeData_(str) {
    return str
      .replace(/[\\]/g, '\\\\')
      .replace(/["]/g, '\\"')
      .replace(/[\/]/g, '\\/')
      .replace(/[\b]/g, '\\b')
      .replace(/[\f]/g, '\\f')
      .replace(/[\n]/g, '\\n')
      .replace(/[\r]/g, '\\r')
      .replace(/[\t]/g, '\\t');
  };
}

使用说明 #

1. 在Gmail中创建一个草稿，主题设为邮件合并内容模板（与代码中DRAFT_TEMPLATE_SUBJECT的值一致），草稿正文可使用{{列名}}占位符引用表格数据（比如{{Name}}对应表格的Name列）。
2. 确保Google Sheet中存在Subjectline列，每行填写对应邮件的主题。
3. 运行脚本中的Send Emails功能即可批量发送主题取自表格的邮件。

内容的提问来源于stack exchange，提问作者Seb