如何在Google App Scripts中的sendEmail函数范围内的唯一非空白列中返回一个值

Question

问题是：我找不到返回“课程”值的方法，因为每次提交表单都会生成一个新行，其中课程名称分布在 E 到 M 列（第 4 到 12 列）。

在每一行中，从 E 到 M 的一列中只有一个“课程”名称（例如仅在 F 中），所有其他列都是空白的。 （用户只能选择一门课程，所有其他列都将为空白。由于分页符，我必须将课程分类为 9 列，以便拆分用户从中选择课程的选项的绝对数量。） 怎么做我将 E 到 M 中唯一非空白单元格的值返回到电子邮件中？

我被建议在任何其他代码之前将整个 findCourse 函数插入到 sendEmail 函数中。我这样做了，但我仍然收到 Google App Scripts 的失败通知：TypeError: Cannot read property "values" from undefined. (line 14, file "Code")（指 var value = e.values[i]）

完整代码如下：

function sendEmail(e) {
function findCourse (e){
      var courseToTake;
      //loop through values 
      for ( var i = 4; i <=12; i ++){
           //pull value into variable 
           var value = e.values[i]; 
         if (value != undefined){
               //if we find an actual string value, set the course to take variable 
               courseToTake = value; 
            }
     }
    return courseToTake; 
}

var Name = e.namedValues["Full name as appear in NRIC"];
var Course = findCourse();
var Start = e.values[14];
var End = e.values[15];
var StartTime = e.values[24];
var EndTime = e.values[25];
var Details = e.values[13];
var Cost = e.values[17];
var Email = e.values[18];
var ROname = e.values[19];
var ROemail = e.values[20];
var Location = e.values[23];
var subject = "Training Approval Request for " + Course;
var message = "<p >" + "Dear " + ROname + "<p />"
+ Name + " seeks your approval to attend the " + Course + ". The details are as follow:"
+ "<p >" + "<b>Date:</b> " + Start + " - " + End + " <br />"
+ "<b>Time:</b> " + StartTime + " - " + EndTime + " <br />"
+ "<b>Location:</b> " + Location + " <br />"
+ "<b>Course objectives and benefits:</b> " + Details + " <br />"
+ "<b>Course fees:</b> " + "$" + Cost + " <br />" + "<p />" 
+ "Please reply directly to this email for your approval or if you have any questions/comments. Thank you. "


MailApp.sendEmail(ROemail, Email, subject, message);
}

在将 findCourse 重新安排为自己的功能后：如果我在这里犯了任何错误，我很抱歉，但我会尽力遵循所有建议。如果我在 Logger.log(e) 中添加正确，这两个函数似乎都未定义

function sendEmail(e) {

 Logger.log(e);



var Name = e.values[2];
var Course = findCourse();
var Start = e.values[14];
var End = e.values[15];
var StartTime = e.values[24];
var EndTime = e.values[25];
var Details = e.values[13];
var Cost = e.values[17];
var Email = e.values[18];
var ROname = e.values[19];
var ROemail = e.values[20];
var Location = e.values[23];
var subject = "Training Approval Request for " + Course;
var message = "<p >" + "Dear " + ROname + "<p />"
+ Name + " seeks your approval to attend the " + Course + ". The details are as follow:"
+ "<p >" + "<b>Date:</b> " + Start + " - " + End + " <br />"
+ "<b>Time:</b> " + StartTime + " - " + EndTime + " <br />"
+ "<b>Location:</b> " + Location + " <br />"
+ "<b>Course objectives and benefits:</b> " + Details + " <br />"
+ "<b>Course fees:</b> " + "$" + Cost + " <br />" + "<p />" 
+ "Please reply directly to this email for your approval or if you have any questions/comments. Thank you. "


MailApp.sendEmail(ROemail, Email, subject, message);
}

 function findCourse (e){

  var courseToTake; 

  //loop through values 

  for ( var i = 4; i <=12; i ++){

       //pull value into variable 

       var value = e.values[i]; 



     if (value != undefined){

           //if we find an actual string value, set the course to take variable 

           courseToTake = value; 

        }

 }




  return courseToTake; 

 var courseToTake = findCourse(e);

Logger.log(e);

}

我将非常感谢这里的任何帮助或替代解决方案。

谢谢！

Answer 1

我在您的代码中进行了哪些更改以解决您的问题：

• 我将onFormSubmit 触发器分配给您的sendEmail 函数，因此事件对象将不再是未定义的
• 我添加了对findCourse() 的调用，因此您的course 变量将不再是未定义的
• 我通过将if(value != undefined) 更改为if(typeof value !== 'undefined') 来修复未定义检查
• 我添加了一个空值检查（这是错误未定义检查后逻辑中的重要位）if(value != '')

解释：

要触发该事件，需要为指向您的sendEmail 函数的On Form Submit 事件设置一个可安装的触发器。这可以在Resources -> Current Project Triggers中找到

要检索课程，您需要调用函数findCourse() 并传入e 事件对象。示例：var course = findCourse(e);。这会将findCourse(e); 的返回值分配给course 变量。然后，您可以在其余语句中正常使用此变量。

在检查undefined时，需要先使用typeof，然后再检查'undefined'这个字符串，否则你的检查会讽刺地抛出一个未定义的异常。

表单提交的值不应该是undefined，空值应该只是空字符串。因此需要检查非空字符串以从值数组中获取课程名称。

固定代码：

function sendEmail(e) {

 Logger.log(e) 


  var course = findCourse(e);

  var Name = e.values[19];
  var Start = e.values[12];
  var End = e.values[14];
  var StartTime = e.values[13];
  var EndTime = e.values[15];
  var Details = e.values[11];
  var Cost = e.values[17];
  var Email = e.values[20];
  var ROname = e.values[21];
  var ROemail = e.values[22];
  var Location = e.values[16];
  var subject = "Training Approval Request for " + course;
  var message = "<p >" + "Dear " + ROname + "<p />"
  + Name + " seeks your approval to attend the " + course + ". The details are as follow:"
  + "<p >" + "<b>Date:</b> " + Start + " - " + End + " <br />"
  + "<b>Time:</b> " + StartTime + " - " + EndTime + " <br />"
  + "<b>Location:</b> " + Location + " <br />"
  + "<b>Course objectives and benefits:</b> " + Details + " <br />"
  + "<b>Course fees:</b> " + "$" + Cost + " <br />" + "<p />" 
  + "Please reply directly to this email for your approval or if you have any questions/comments. Thank you. "

  MailApp.sendEmail(ROemail, Email+";" + "redactedEmail", subject, message);
}

function findCourse (e){
  var courseToTake; 

  //loop through values 
  for ( var i = 2; i <=10; i ++){   
    //pull value into variable 
    var value = e.values[i];             
    if (typeof value !== 'undefined'){ //If value is defined
      if(value != ''){ //If value is not blank
        //if we find an actual non-blank string value, set the course to take variable       
        courseToTake = value;           
      }   
    }   
  }  
  return courseToTake; 
}