Question

我正在创建一个Google Web App（HTML表单），它会将文件上传到My Drive上的文件夹。不需要上传文件，因此有时候这个输入基本上是“空白”。除非您没有选择要上传的文件，否则该应用程序可以正常运行。它吐出了这个错误：“例外：我们很抱歉，发生了服务器错误。请稍等一下再试一次。”我有两个文件，html文件和.gs文件。这是他们：

/* The script is deployed as a web app and renders the form */
function doGet(e) {
  return HtmlService.createHtmlOutputFromFile('FormFrontend.html');
}

/* This function will process the submitted form */
function uploadFiles(form) {
  try {
    /* Name of the Drive folder where the files should be saved */
    var dropfolder = "Uploaded Files";
    var folder, folders = DriveApp.getFoldersByName(dropfolder);

    /* Find the folder, create the folder if it does not exist */
    if (folders.hasNext()) {
      folder = folders.next();
    } else {
      folder = DriveApp.createFolder(dropfolder);
    }

    /* Get the file uploaded though the form as a blob */
    var blob = form.myFile;
    var file = folder.createFile(blob);
    var urlstr = file.getUrl()

    /* Set the file description as the name of the uploader */
    file.setDescription("Uploaded by " + form.ContactName);

    /* Write response to spreadsheet */
    var ss = SpreadsheetApp.openById("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")
    var responses = ss.getSheetByName("Responses");
    responses.appendRow([form.CompanyName, form.ContactName, form.PhoneNumber, form.Email, form.Date, form.Severity, form.Details, urlstr])

    /* As long as there's no errors you should se the below text */
    return "Form Submitted Successfully "

  } catch (error) {

    /* If there's an error, show the error message */
    return error.toString();
  }

}

<html>

<body>
  <!-- This is the actual HTML form -->
  <div id="theform">
    <form id="myForm">

      <p style="font-size:30px">Customer Form</p>

      Company Name:
      <input type="text" name="CompanyName">
      <br>Contact Name:
      <input type="text" name="ContactName">
      <br>Phone Number:
      <input type="text" name="PhoneNumber">
      <br>Contact Email:
      <input type="email" name="Email">
      <br>Date:
      <input type="date" name="Date">
      <br>Overall Severity: (1 Lowest, 5 Highest)
      <br>
      <input type="number" name="Severity" min="1" max="5" value="1">
      <br>Details:

      <br>
      <textarea name="Details" rows=10 cols=65></textarea>
      <br>
      <br>Additional File (Optional):
      <input type="file" name="myFile">
      <br>

      <!-- The submit button. It calls the server side function uploadFiles() on click -->
      <input type="submit" value="Submit" onclick="this.value='Submitting..';
                    google.script.run.withSuccessHandler(fileUploaded)
                    .uploadFiles(this.parentNode);
                    return false;">
    </form>
  </div>

  <!-- Here the results of the form submission will be displayed -->
  <div id="output"></div>
</body>

</html>

<!-- The function will be called after the Google Script has executed -->
<script>
  function fileUploaded(status) {
    document.getElementById('myForm').style.display = 'none';
    document.getElementById('output').innerHTML = status;
  }
</script>

如果尝试在“/ *获取通过表单上传的文件作为blob * /”部分放置一个IF语句，告诉它只要将form.myFile空白时将urlstr设置为空，但它仍然失败（但如果你选择一个实际的文件，它仍然成功完成）。我无法在记录器中显示任何有用的信息。

我是Google App脚本的新手，所以任何帮助都会受到赞赏！

Answer 1

我会检查实际返回到变量blob的内容。

var blob = form.myFile;

也许使用JavaScript typeOf检查类型。

var whatsTheType = typeOf blob;

在此测试功能中：

function testIt() { 
  var newTestFile = DriveApp.createFile('New Text File', 'Hello, world!');
  var myBlob = newTestFile.getBlob();

  var whatsTheType = typeof myBlob;
  Logger.log('whatsTheType: ' + whatsTheType);
}

JavaScript typeof将blob的类型作为“对象”返回。如果您检查typeof，并且它不是对象，则表示该文件未上传。

进行if条件检查，而不是“尝试/捕获”。 “尝试/捕获”显然不会阻止代码死亡。

if (whatsTheType === "object") {
  //Create the file
  var file = folder.createFile(blob);
};

或者，如果文件已上传，您应该能够检查文件选择器的value属性以返回名称。如果上传的文件没有名称，则用户不使用文件选择器。

Answer 2

这就是最终的工作。 .getContentType似乎总是返回“application / octet-stream”，当它留空并检查返回的内容类型是否是特定的。

/* Get the file uploaded though the form as a blob */
var blob = form.myFile;
var contentType = blob.getContentType();

if (contentType != "application/octet-stream") {
    var file = folder.createFile(blob);
    var urlstr = file.getUrl();
    /* Set the file description as the name of the uploader */
    file.setDescription("Uploaded by " + form.ContactName);
 } else {
    var urlStr = "None given";
 }

提交的表单上的<input type =“file”/>为空时出错（Google App Script）

2 个答案: