javascript - 为什么这种从 `e.parameter.variableName` 方法恢复数组的尝试不起作用？

Question

这段代码出了什么问题？当我在 sumbit 函数之前记录数组列表时，它没问题(具有预期的内容和元素在数组中的位置)。但是，当我通过 e.parameter.arrayList 获取它时，它没有相同的值，也不是元素。如何解决？

function showList(folderID) {
  var folder = DocsList.getFolderById(folderID);
  var files = folder.getFiles();
  var arrayList = [];
  for (var file in files) {
    file = files[file];
    var thesesName = file.getName();
    var thesesId = file.getId();
    var thesesDoc = DocumentApp.openById(thesesId);
    for (var child = 0; child < thesesDoc.getNumChildren(); child++){
    var thesesFirstParagraph = thesesDoc.getChild(child);
    var thesesType = thesesFirstParagraph.getText();
      if (thesesType != ''){
         var newArray = [thesesName, thesesType, thesesId];
         arrayList.push(newArray);
         break;
         }
      }
   }
    arrayList.sort();
    var mydoc = SpreadsheetApp.getActiveSpreadsheet();
    var app = UiApp.createApplication().setWidth(550).setHeight(450);
    var panel = app.createVerticalPanel()
                   .setId('panel');

    var label = app.createLabel("Choose your theses").setStyleAttribute("fontSize", 18);
    app.add(label);
    panel.add(app.createHidden('checkbox_total', arrayList.length));
    panel.add(app.createHidden('arrayList', arrayList)); 
    Logger.log(" arrayList before submit = " + arrayList);


    for(var i = 0; i < arrayList.length; i++){      
      var checkbox = app.createCheckBox().setName('checkbox_isChecked_'+i).setText(arrayList[i][0]);
      Logger.log("arrayList[i][0] = " + arrayList[i][0]);
      Logger.log("arrayList[i] ====> " + arrayList[i]);
      panel.add(checkbox);
   }
   var handler = app.createServerHandler('submit').addCallbackElement(panel);
   panel.add(app.createButton('Submit', handler));
   var scroll = app.createScrollPanel().setPixelSize(500, 400);  
  scroll.add(panel);
  app.add(scroll);
  mydoc.show(app);


}

function include(arr, obj) {
    for(var i=0; i<arr.length; i++) {
        if (arr[i] == obj) // if we find a match, return true
            return true;    }
    return false; // if we got here, there was no match, so return false
 }

function submit(e){
   Logger.log(" arrayList = " + arrayList);
  var arrayList = e.parameter.arrayList;
  var numberOfItems = Number(e.parameter.checkbox_total);
  var thesesArrays = [];
  var usedThesesType = [];
  var usedThesesName = [];
  for(var i = 0; i < numberOfItems; i++){
    if(e.parameter['checkbox_isChecked_'+i] == 'true'){
     Logger.log(" arrayList inside for loop = " + arrayList);
      Logger.log(" arrayList[i] = " + arrayList[i]);
      thesesArrays.push(arrayList[i]);
      usedThesesType.push(arrayList[i][1]);
            Logger.log(" arrayList[i][1] = " + arrayList[i][1]);

      usedThesesName.push(arrayList[i][0]); 
       Logger.log(" arrayList[i][0] = " + arrayList[i][0]);
     }
   }
  var allThesesTypeArray = []; // To control Theses type apparence in the final doc
  for (var i = 0; i < arrayList.length; i++) {
     var thesesType = arrayList[i][1];
     if ( !(include(allThesesTypeArray, thesesType)) ){
        allThesesTypeArray.push(thesesType);     }
   }
  var targetDocId = userProperties.getProperty('targetDocId');
  for (var i = 0; i < thesesArrays.length; i++) {
     var thesesType = thesesArrays[i][1];
    Logger.log(" thesesArrays = " + thesesArrays);
     var thesesId = thesesArrays[i][2];
     importTheses(targetDocId, thesesId, thesesType);       
    }   
  cleanNotUsedThesesTitles(targetDocId, allThesesTypeArray, usedThesesType);
  if(userProperties.getProperty('atLeastOneTheseType') == 0){
      Browser.msgBox('There was no theses inside your model. Check it!');
  }  
  var joinAndInsert = userProperties.getProperty('joinAndInsert');  
  showURL(usedThesesName, joinAndInsert);
  return UiApp.getActiveApplication().close();
}

Answer 1

您不能简单地将一个数组传递到表单字段并取回该数组的值。这与您在 Get String Value of Blob Passed to e.parameter in Apps Script 上询问的问题完全相同.唯一的区别是现在您尝试传递一个数组而不是一个 Blob。

您只能将字符串作为字段的值传递，因此您需要将您的数据(arrayList)转换为字符串。然后您需要将该字符串转换回数组。使用 JSON.stringify() 和 JSON.parse() 执行此操作。

改变

panel.add(app.createHidden('arrayList', arrayList));

到

panel.add(app.createHidden('arrayList', JSON.stringify(arrayList)));

和改变

var arrayList = e.parameter.arrayList;

到

 var arrayList = JSON.parse(e.parameter.arrayList);