Lägg till anpassad servervalideringsfunktion

Möjliga användningsscenario

Ibland kan du behöva implementera datavalidering på server-sidan. Aspose.Cells.GridWeb gör att du kan lägga till anpassad server-sidans datavalidering. Du måste specificera cellområdet eller området. Du kan även ställa in klient-sidans valideringsfunktioner för återuppringningar med anpassad server-sidans validering.

Lägg till anpassad server-sidans valideringsfunktion

Du måste ange den servervalideringsklass som implementerar gränssnittet GridCustomServerValidation via attributet GridValidation.ServerValidation. Du måste också ange klient-sidans valideringsfunktion (den ska skrivas i JavaScript på klient-sidan), denna funktion måste validera datan på klienten vid återuppringning. Du kan ange felmeddelandesträngen via egenskapen GridValidation.ErrorMessage och titel via egenskapen GridValidation.ErrorTitle för dina behov. Vänligen se en serie skärmdumpar som visar hur det fungerar (steg för steg) i ett givet scenario efter att ha utfört det provkod nedan. I exemplet kan du inte uppdatera data i cellerna B2:C3. När du försöker redigera dessa celler i kalkylarket kommer du att uppmanas av felmeddelanden och det tidigare värdet återställs. Du kan öppna konsolfönstret (i din webbläsare) för att skriva ut cellens info/detaljer för vissa händelser.

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Exempelkod

	// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-.NET

	-----------------------------------------------
	AddCustomServerSideFunctionValidation.aspx
	-----------------------------------------------

	<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AddCustomServerSideFunctionValidation.aspx.cs" Inherits="Aspose.Cells.GridWeb.Examples.AddCustomServerSideFunctionValidation" %>

	<%@ Register TagPrefix="acw" Namespace="Aspose.Cells.GridWeb" Assembly="Aspose.Cells.GridWeb" %>

	<!DOCTYPE html>

	<html xmlns="http://www.w3.org/1999/xhtml">
	<head runat="server">
	<link rel="stylesheet" href="/Scripts/jquery-ui.css" />
	<script src="/Scripts/jquery-2.1.1.js"></script>
	<script src="/Scripts/jquery-ui.js"></script>
	<script type="text/javascript">
	var lastselectvalue = null;
	var localvalue = {};
	function myCellSelect(cell) {
	//Get the selected cell.
	var value = this.getCellValueByCell(cell);
	//Get the value to store.
	lastselectvalue = value;
	var key = this.acttab + "_" + this.getCellRow(cell) + "_" + this.getCellColumn(cell);
	//Store the respective cell's value.
	localvalue[key] = lastselectvalue;
	console.log("OnCellSelect: value:" + value + " row:" + this.getCellRow(cell) + ",col:" + this.getCellColumn(cell));
	console.log("Last selected value:" + lastselectvalue);
	}
	function ValidationErrorClientFunctionCallback(cell, msg) {
	//Get the error message string.
	var errmsg1 = getattr(cell, "errmsg");
	//Show the error message in the client dialog.
	alert(errmsg1);
	//Showing an alert message where "this" refers to GridWeb
	alert(this.id + "----> " + msg + " Previous value will be restored.");
	$("#errmsg").text(msg);
	console.log("Selected cell:" + " row:" + this.getCellRow(cell) + ",col:" + this.getCellColumn(cell));
	//Get the GridWeb.
	var who = this;
	//Restore to valid value/previous value.
	who.setValid(cell);
	var key = this.acttab + "_" + this.getCellRow(cell) + "_" + this.getCellColumn(cell);
	lastselectvalue = localvalue[key];
	setInnerText(cell.children[0], lastselectvalue);
	}
	</script>

	<title>Add Custom Server-side Function Validation</title>
	</head>
	<body>
	<form id="form1" runat="server">
	<div>
	<div>
	<b>GridWeb Version:&nbsp</b>
	<asp:Label ID="lblVersion" runat="server" Text="Label"></asp:Label>
	<br />

	<acw:GridWeb ID="GridWeb1" runat="server" OnCellSelectedClientFunction="myCellSelect" Width="44%" Height="384px" ShowLoading="true" XhtmlMode="true"
	PresetStyle="Standard" EnableAJAX="true" EnableAsync="true" RenderHiddenRow="true" MaxColumn="15" MaxRow="21">
	</acw:GridWeb>

	</div>
	</div>

	<span id="errmsg" style="color: red;"></span>
	</form>
	</body>
	</html>

	-----------------------------------------------
	AddCustomServerSideFunctionValidation.aspx.cs
	-----------------------------------------------

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Web;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	using Aspose.Cells.GridWeb;
	using Aspose.Cells.GridWeb.Data;


	namespace Aspose.Cells.GridWeb.Examples
	{
	class MyServerValidation : GridCustomServerValidation
	{
	public string Validate(GridWorksheet sheet, int row, int col, string value)
	{
	if ((row == 1) \|\| (row == 2))
	{
	return "Value Not Passed!";
	}
	else
	{
	return string.Empty;
	}
	}
	}

	public partial class AddCustomServerSideFunctionValidation : System.Web.UI.Page
	{
	protected void Page_Load(object sender, EventArgs e)
	{
	if (!IsPostBack && !this.GridWeb1.IsPostBack)
	{
	lblVersion.Text = GridWeb.GetVersion();

	//Input values to B2:C3 cells in the active worksheet.
	GridWeb1.ActiveSheet.Cells["B2"].PutValue("This");
	GridWeb1.ActiveSheet.Cells["C2"].PutValue("cannot");
	GridWeb1.ActiveSheet.Cells["B3"].PutValue("be");
	GridWeb1.ActiveSheet.Cells["C3"].PutValue("changed");

	//Get the validations of the active sheet.
	var gridValidationCollection = GridWeb1.ActiveSheet.Validations;

	//Add data validation to range/area: B2:C3
	GridValidation gv = gridValidationCollection.Add(new GridCellArea(1, 1, 2, 2));

	//Set the validation type to custom server function.
	gv.ValidationType = GridValidationType.CustomServerFunction;

	//Set the server validation class which implements the GridCustomServerValidation interface.
	gv.ServerValidation = new MyServerValidation();

	//Set the client validation function (written in JavaScript on client-side).
	//This function is compulsory to validate the data on client end on callback.
	gv.ClientValidationFunction = "ValidationErrorClientFunctionCallback";

	//Set the error message string.
	gv.ErrorMessage = "Error found! You cannot change this value.";

	//Set the error title.
	gv.ErrorTitle = "Error";
	}
	}
	}
	}

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