Async Custom Validator RSS

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  Bader

  Member

  10 Points

  86 Posts

  Async Custom Validator

  May 06, 2012 06:51 AM|LINK

  Hi,

  I found on the internet a custom validator server control (http://www.codeproject.com/Articles/27352/Client-Side-Validation-Running-Server-Side-Code):

  using System;
  using System.Web.UI.WebControls;
  using System.Web.UI;
  
  namespace System.Web.UI
  {
  	/// <author>
  	/// Artiom Chilaru
  	/// </author>
  	/// <summary>
  	/// Client side validation running server side code
  	/// </summary>
  	[ToolboxData("<{0}:AsyncCustomValidator runat=server></{0}:AsyncCustomValidator>")]
  	public class AsyncCustomValidator : CustomValidator
  	{
  		private ScriptManager ScriptManager
  		{
  			get
  			{
  				ScriptManager manager = ScriptManager.GetCurrent(this.Page);
  				if (manager == null)
  				{
  					throw new InvalidOperationException(string.Format("The control with ID '{0}' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.", new object[] { this.ID }));
  				}
  
  				return manager;
  			}
  		}
  
  		protected override void OnLoad(EventArgs e)
  		{
  			base.OnLoad(e);
  			if (ScriptManager.EnablePageMethods == false)
  				throw new InvalidOperationException("The ScriptManager has to have EnablePageMethods set to true to allow the AsyncCustomValidator to work");
  
  			if (!String.IsNullOrEmpty(AsyncWebMethod))
  			{
  				base.ClientValidationFunction = ClientID + "_Validate";
  
  				String funcs = "\n" +
  					"function " + ClientID + "_Validate(source, args)\n" +
  					"{\n" +
  					(String.IsNullOrEmpty(AsyncWebMethodRunCondition) ? String.Empty :
  					" if(" + AsyncWebMethodRunCondition + ")\n\t") +
  					" PageMethods." + AsyncWebMethod + "(args.Value, " + ClientID + "_Succedeed);\n" +
  					"}\n" +
  					"function " + ClientID + "_Succedeed(res)\n" +
  					"{\n" +
  					" document.getElementById('" + ClientID + "').isvalid=res;\n" +
  					" ValidatorUpdateDisplay(document.getElementById('" + ClientID + "'));\n" +
  					"}";
  				Page.ClientScript.RegisterClientScriptBlock(GetType(), ClientID + "_Scripts", funcs, true);
  			}
  		}
  
  		public string AsyncWebMethod
  		{
  			get
  			{
  				return (string)this.ViewState["AsyncWebMethod"] ?? String.Empty;
  			}
  			set
  			{
  				this.ViewState["AsyncWebMethod"] = value;
  			}
  		}
  
  		public String AsyncWebMethodRunCondition
  		{
  			get
  			{
  				return (string)this.ViewState["AsyncWebMethodRunCondition"] ?? String.Empty;
  			}
  			set
  			{
  				this.ViewState["AsyncWebMethodRunCondition"] = value;
  			}
  		}
  
  		public new String ClientValidationFunction
  		{
  			get
  			{
  				return base.ClientValidationFunction;
  			}
  			set
  			{
  				throw new InvalidOperationException("Cannot override the ClientValidationFunction.");
  			}
  		}
  	}
  }

  
  I tried it, it works fine in all cases except to using it in a dynamiclly loaded usercontrol, I mean, If I load the usercontrol dynamiclly, then I get the following web error message:

  Line: 1 Error: The value of the property 'ctl00_ctl00_ContentPlaceHolder1_ContentPlaceHolder1_AddCategory_userControl831_acvValidateMe_Validate' is null or undefined, not a Function object

  Please, I need your help,

  Regards,

  Bader