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"htmlfile: Unspecified Error" when clicking on Tree Node

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This is a migrated thread and some comments may be shown as answers.

Jason Gajewski asked on 05 May 2011, 07:36 PM

I have added JavaScript to my pages that will detect if the user has made a change to a field and prompts the user to save those changes when they perform an action that will take them away from the page.

To do this, I'm performing 2 basic steps:

On the input keyup event, I'm setting a "dirty" variable to "true"
On the document.ready event, I'm prompting the user to "save changes" (if dirty = true) on the window.onbeforeunload event.

This has been working for all pages in my project, until I began using the RadTreeView. When I make a change on a page that has a RadTreeView, and then click on a Node that takes the user to a new page, they are prompted. If the user clicks "Cancel", the following error is thrown:

"htmlfile: Unspecified Error"

I have created a basic example that utilizes the following:

Visual Studio 2010
Telerik.Web.UI version 2010.1.519.40

Any help would be greatly appreciated!

5 Answers, 1 is accepted

answered on 09 May 2011, 02:18 PM

<%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title></title>

<telerik:RadStyleSheetManager ID="RadStyleSheetManager1" runat="server" />

</head>

<body>

<form id="form1" runat="server">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">

<Scripts>

<%--Needed for JavaScript IntelliSense in VS2010--%>

<%--For VS2008 replace RadScriptManager with ScriptManager--%>

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" />

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />

</Scripts>

</telerik:RadScriptManager>

<script type="text/javascript">

// Default to False

isDirty = false;

ignoreChanges = false;

inputType = null;

inputId = null;

postBackOverride = false;

enableDebugging = false;

skipOne = false;

wasDirty = false;

function bindInputEvents() {

$(':input').keyup(function (event) {

oninputType = $(this).attr('type');

inputId = $(this).attr('id')

if (inputType != "hidden") {

debugAlert(inputType + " input changed. Id=" + inputId + " IsDirty=" + isDirty + " ignoreChanges=" + ignoreChanges);

makeDirty();

}

debugAlert(inputType + " Input Updated. Id=" + inputId);

});

}

// Bind change

$(document).ready(function () {

bindInputEvents()

// Show prompt when trying to nvaigate away if there are changes

window.onbeforeunload = function () {

if (!skipOne) {

if (isDirty) {

return 'You have unsaved changes. You will lose your changes if you leave the page.';

}

else {

isDirty = wasDirty;

skipOne = false;

}

};

});

function makeDirty() {

isDirty = true;

debugAlert("MakeDirty called. isDirty=" + isDirty);

}

function debugAlert(msg) {

if (enableDebugging == false) {

return true

} else {

alert(msg);

}

</script>

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" />

<telerik:RadSkinManager ID="RadSkinManager1" runat="server" Skin="Windows7" />

<h3>

First, enter some text below to cause the page to get "Dirty"</h3>

<div>

Enter Text to cause Dirty:

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></div>

<br />

<h3>

Now that the page is dirty, click on the button below to be prompted to "Save"</h3>

<div>

<asp:Button runat="server" Text="Click Me when Dirty"

onclick="Unnamed1_Click" />

</div>

<br />

<h3>

Notice how you were prompted and when you click either "Cancel" or the "X", no error

is generated.</h3>

<h3>

Now, click anywhere in the tree. The tree has an OnClick event that will attempt

to navigate to Yahoo.com</h3>

<div>

<telerik:RadTreeView ID="RadTreeView2" runat="server" Width="300px" Height="250px"

OnNodeClick="RadTreeView2_NodeClick">

<DataBindings>

<telerik:RadTreeNodeBinding Expanded="True" />

</DataBindings>

</telerik:RadTreeView>

</div>

<h3>Notice how you were prompted and when you click either "Cancel" or the "X", an error

is generated.</h3>

</form>

</body>

</html>

answered on 09 May 2011, 02:20 PM

using System;

using System.Collections.Generic;

using System.Web.UI;

using Telerik.Web.UI;

public partial class Default : System.Web.UI.Page

{

internal class SiteDataItem

{

private string _text;

private int _id;

private int _parentId;

public string Text

{

get { return _text; }

set { _text = value; }

}

public int ID

{

get { return _id; }

set { _id = value; }

}

public int ParentID

{

get { return _parentId; }

set { _parentId = value; }

}

public SiteDataItem(int id, int parentId, string text)

{

_id = id;

_parentId = parentId;

_text = text;

}

protected void Page_Load(object sender, EventArgs e)

{

if (!Page.IsPostBack)

{

BindToIEnumerable(RadTreeView2);

}

private static void BindToIEnumerable(RadTreeView treeView)

{

List<SiteDataItem> siteData = new List<SiteDataItem>();

siteData.Add(new SiteDataItem(1, 0, "Products"));

siteData.Add(new SiteDataItem(2, 1, "RadControls for ASP.NET Ajax"));

siteData.Add(new SiteDataItem(3, 1, "RadControls for Silverlight"));

siteData.Add(new SiteDataItem(4, 2, "RadGrid"));

siteData.Add(new SiteDataItem(5, 2, "RadScheduler"));

siteData.Add(new SiteDataItem(6, 2, "RadEditor"));

siteData.Add(new SiteDataItem(7, 3, "RadGrid"));

siteData.Add(new SiteDataItem(8, 3, "RadMenu"));

siteData.Add(new SiteDataItem(9, 3, "RadEditor"));

treeView.DataTextField = "Text";

treeView.DataFieldID = "ID";

treeView.DataFieldParentID = "ParentID";

treeView.DataSource = siteData;

treeView.DataBind();

}

protected void RadTreeView2_NodeClick(object sender, RadTreeNodeEventArgs e)

{

Response.Redirect("http://www.yahoo.com");

}

protected void Unnamed1_Click(object sender, EventArgs e)

{

Response.Redirect("http://www.yahoo.com");

}