Category / Section
How to prevent importing excel file containing unknown formula in Spreadsheet
1 min read
Description
This knowledge base explains how to prevent importing excel file containing unknown formula in Spreadsheet with alert message.
Solution
It can be achievable by sending PreventUnknownFormulas option with import request in “Spreadsheet.Open()” method.
JAVASCRIPT
HTML
<div id="Spreadsheet"></div>
JS
$("#Spreadsheet").ejSpreadsheet({
importSettings:
{
importMapper: "Spreadsheet/Import",
}
});
Web API
[AcceptVerbs("POST")]
public string Import()
{
// Get imported file here, which is imported from file upload control.
var files = HttpContext.Current.Request.Files;
ImportRequest importRequest = new ImportRequest();
//To prevent importing excel with unknown formula
importRequest.PreventUnknownFormulas = true;
importRequest.FileStream = files[0].InputStream;
// Returns the result.
return Spreadsheet.Open(importRequest);
}
MVC
CSHTML
@(Html.EJ().Spreadsheet<object>("Spreadsheet")
.ImportSettings(import =>
{
import.ImportMapper("Home/Import");
})
)
C#
public string Import(ImportRequest importRequest)
{
//To prevent importing excel with unknown formula
importRequest.PreventUnknownFormulas = true;
// Returns the result.
return Spreadsheet.Open(importRequest);
}
ASP
ASPX
<ej:Spreadsheet ID="Spreadsheet" runat="server"> <ImportSettings ImportMapper="SpreadsheetHandler.ashx" /> </ej:Spreadsheet>
ASHX.CS
public void ProcessRequest(HttpContext context)
{
var files = context.Request.Files;
ImportRequest importRequest = new ImportRequest();
//To prevent importing excel with unknown formula
importRequest.PreventUnknownFormulas = true;
importRequest.FileStream = files[0].InputStream;
string SpreadsheetData = Spreadsheet.Open(importRequest);
context.Response.Write(SpreadsheetData);
}
The following output is displayed as the result of above behavior,
Figure: Notify the user with message when excel file with unsupported formula is imported in Spreadsheet.
