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Datavalidation dropdown list - How to prohibit empty value?


By : hyoseok
Date : July 29 2020, 11:00 PM
I hope this helps . Using Excel's data validation lists it is not possible to prohibit empty cells. Set of Ignore blank checkbox unchecked only prevents an existing cell to get changed from any value to an empty value. But selecting a cell in Excel and then pressing Del deletes the whole cell and not only empties the cell value. But the data validation does not work on cells which are not already present. So this is an Excel issue and apache poi cannot do anything against this since apache poi cannot do what Excel cannot do.
The best we can do using Excel's data validation and using apache poi is telling the users as much and often as possible what they shall do. To do so we can show a input message when cell is selected additional to the error message.
code :
import java.io.FileOutputStream;

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.util.CellRangeAddressList;

class CreateExcelDataValidationList {

 public static void main(String[] args) throws Exception {

  //Workbook workbook = new HSSFWorkbook();
  Workbook workbook = new XSSFWorkbook();

  Sheet sheet = workbook.createSheet();

  DataValidationHelper dvHelper = sheet.getDataValidationHelper();
  DataValidationConstraint dvConstraint = dvHelper.createExplicitListConstraint(new String[]{"Checked", "Unchecked"}) ;
  int lastRow = workbook.getSpreadsheetVersion().getLastRowIndex();
  CellRangeAddressList addressList = new CellRangeAddressList(0, 10, 0, 0);

  DataValidation validation = dvHelper.createValidation(dvConstraint, addressList);
  validation.setEmptyCellAllowed(false);
  validation.createPromptBox("Prompt", "Please select Cecked or Unchecked from dropdown list.");
  validation.createErrorBox("Error", "Please select Cecked or Unchecked from dropdown list.");
  if (workbook instanceof XSSFWorkbook) validation.setShowErrorBox(true);
  if (workbook instanceof XSSFWorkbook) validation.setShowPromptBox(true);
  sheet.addValidationData(validation);

  FileOutputStream out = null;
  if (workbook instanceof HSSFWorkbook) {
   out = new FileOutputStream("CreateExcelDataValidationList.xls");
  } else if (workbook instanceof XSSFWorkbook) {
   out = new FileOutputStream("CreateExcelDataValidationList.xlsx");
  }
  workbook.write(out);
  workbook.close();
  out.close();

 }
}


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Create dataValidation from named list in different sheet


By : Tate Norman
Date : March 29 2020, 07:55 AM
help you fix your problem Actually managed to solve my problem by creating an additional name to sheetIndex(0) and reference it to the name in sheetIndex(1).... The following is the code which works as desired:
code :
    Name name = dctmWorkSheet.getWorkbook().createName();
    name.setSheetIndex(1);
    name.setNameName(cell.getStringCellValue());    
    name.setRefersToFormula(getRangeRefersToFormula(valueAssSheet, firstRow, rowIndex, insertCol));
    Name name2 = dctmWorkSheet.getWorkbook().createName();
    name2.setSheetIndex(0);
    name2.setNameName(name.getNameName());
    name2.setRefersToFormula(name.getRefersToFormula());


    validationHelper = dctmWorkSheet.getDataValidationHelper();
    constraint = validationHelper.createFormulaListConstraint(name2.getNameName());
    dataValidation = validationHelper.createValidation(constraint, cral);
    dataValidation.setEmptyCellAllowed(true);
    dataValidation.setShowErrorBox(true);
    dataValidation.setErrorStyle(DataValidation.ErrorStyle.STOP);
    dataValidation.createErrorBox("Error", "Please use Pick List Value");
    dctmWorkSheet.addValidationData(dataValidation);

OpenXml DataValidation set predefined List for columns


By : MUNI
Date : March 29 2020, 07:55 AM
I wish this helpful for you Okay I got this solved. Added escaped double quotes to formula and done.
code :
DataValidation dataValidation = new DataValidation
{
    Type = DataValidationValues.List,
    AllowBlank = true,
    SequenceOfReferences = new ListValue<StringValue>() { InnerText = "B1" },
    Formula1 = new Formula1("\"True,False\"") // escape double quotes, this is what I was missing
};

DataValidations dvs = worksheet.GetFirstChild<DataValidations>(); //worksheet type => Worksheet
if (dvs != null)
{
    dvs.Count = dvs.Count + 1;
    dvs.Append(dataValidation);
}
else
{
    DataValidations newDVs = new DataValidations();
    newDVs.Append(dataValidation);
    newDVs.Count = 1;
    worksheet.Append(newDVs);
}

How to Prohibit a Particular Option of a Dropdown to Send Value?


By : Apoorv
Date : March 29 2020, 07:55 AM
it fixes the issue It turned out that all you needed to have a default prompt that sends null to db if no option is selected and sends value to db if an option is selected is to add ignore_date: true to f.time_select attributes. So I just turned
code :
<%= f.time_select :hours, {minute_step: 5, prompt: true, order: [:hour]} %>
<%= f.time_select :hours, {minute_step: 5, prompt: true, ignore_date: true, order: [:hour]} %>

Handle error in list DataValidation formula


By : kyntyn
Date : March 29 2020, 07:55 AM
Hope that helps I have a list DataValidation formula with depends on other column. , Knowing MATCH results in #N/A I wrapped it in IF(IFNA(...
code :
IF(IFNA(failingformula;FALSE);formula;someCellWithEmptyValue)
and whole formula is
IF(IFNA(MATCH(A1;DATA!1:1;0);FALSE);OFFSET(DATA!A2;0;MATCH(A1;DATA!1:1;0)-1;COUNTA(OFFSET(DATA!A:A;0;MATCH(A1;DATA!1:1;0)-1))-1);C3)

Excel DataValidation dropdown value coming back null


By : Kripa Sindhu Singh
Date : March 29 2020, 07:55 AM
like below fixes the issue Your problem is not reproducible for me. This question shows why we always need a Minimal, Reproducible Example.
So let's have a such:
code :
import org.apache.poi.ss.usermodel.*;
import java.io.FileInputStream;

class ExcelParseCellValue {

 static void setSomething(Cell cell) {
  Object var = parseCellValue(cell);
  System.out.println(String.valueOf(var));
 }

 static Object parseCellValue(Cell cell) {
  Object var = null;
  switch (cell.getCellType()) {
   case NUMERIC:
    var = cell.getNumericCellValue();
    break;
   case STRING:
    var = cell.getStringCellValue();
    break;
   case BLANK:
    var = null;
    break;
   default:
    var = null;
  }
  return var;
 }

 public static void main(String[] args) throws Exception {

  Workbook workbook = WorkbookFactory.create(new FileInputStream("ExcelDataValidation.xlsx"));
  Sheet sheet = workbook.getSheetAt(0);

  for (Row row : sheet) {
   for (Cell cell : row) {
    setSomething(cell);
   }
  }  
  workbook.close();
 }
}
C:\java>c:\java\jdk-12.0.2\bin\java -cp .;.\*;poi-4.1.1\*;poi-4.1.1\lib\*;poi-4.1.1\ooxml-lib\* ExcelParseCellValue
Text
Number
Amount
Validation
Text1
1.0
1234.56
Yes
Text2
2.0
789.12
No
Text3
3.0
34567.89
Yes
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