Last Updated: 08 Oct 2013 17:07 by Chris Jibb
Uploading a file when ExplorerMode is set to FileTree causes a JavaScript error in FileExplorer.

The same error is thrown in case the there is a value, set to the FileExplorer's InitialPath property.
Last Updated: 06 Jun 2013 08:07 by Martin Roussel
Created by: Vessy
Comments: 1
Category: FileExplorer
Type: Bug Report
Upload dialog layout is broken in iPad

Steps to reproduce:
1. Navigate to ;
2. Open the upload dialog.
Last Updated: 20 Jun 2017 14:49 by Imported User
If the AsyncUpload control is enabled in the FileExplorer when  and the user uploads more that 1 file, the FileExplorer throws a JavaScript error with the following message:

TypeError: this.control.get_allowMultiRowSelection is not a function
Last Updated: 12 May 2016 08:36 by CCG
When users quickly select different folders in the TreeView and content is still loading, the caching mechanism of FileExplorer fails and loads incorrect data to the last selected folder. 
Last Updated: 27 Jul 2016 10:10 by DavidS
For the time being the following workaround can be used:
		<telerik:RadFileExplorer ID="RadFileExplorer1" runat="server" Width="230px" Height="430px" DisplayUpFolderItem="true"
			Telerik.Web.UI.RadFileExplorer.prototype._onTreeContextMenuItemClicked = function (sender, args) {
				var treeNode = args.get_node();
				var menuItem = args.get_menuItem().get_value();
				switch (menuItem) {
					case "Rename":
						var nodeInput = treeNode.get_inputElement();
						if (!this._allowFileExtensionRename) {
							var item = this._createItemFromTreeViewNode(treeNode);
							if (!item.isDirectory())
								nodeInput.value = $T.FileExplorerHelper.stripExtension(item);
						var treeUL = sender.get_childListElement();
						this._treeKeyDownDelegate = Function.createDelegate(this, this._treeKeyDown);
						if (treeUL) $telerik.addHandler(treeUL, "keydown", this._treeKeyDownDelegate, true);
					case "NewFolder":
						if (!this._isNodeADirectory(treeNode)) {
							treeNode = treeNode.get_parent();
						var nodeValue = treeNode.get_value();
					case "Delete":
						var selItems = sender.get_selectedNodes();
						var delItem = new Array();
						for (var i = 0; i < selItems.length; i++) {
							var currItem = this._createItemFromTreeViewNode(selItems[i]);
					case "Upload":
					case "Copy":
						var selectedItem = null;
						if (!treeNode.get_selected()) {
							selectedItem = this._createItemFromTreeViewNode(treeNode);
						this._copy("tree", selectedItem);
					case "Paste":
						var pasteItem = this._createItemFromTreeViewNode(treeNode);
Last Updated: 03 Aug 2018 16:39 by Kevin Neumann
A workaround is to disable the embedded jQuery and use an older version (for example, 1.11.1 which is the previous version the suite used):

Repro steps:

1. put a file explorer on the page
2. right click a file in it and select Rename
3. enter a new name, click OK

Expected: file is renamed

Actual: Firefox throws TypeError: access to strict mode caller function is censored

Sample markup

        <telerik:RadFileExplorer RenderMode="Lightweight" runat="server" ID="FileExplorer1" Width="520px" Height="310px">
            <Configuration ViewPaths="~/images" UploadPaths="~/images"
Last Updated: 04 Mar 2019 16:11 by ADMIN
A workaround is to disable the embedded jQuery and use an older version (for example, 1.11.1 which is the previous version the suite used):
Last Updated: 10 May 2013 14:15 by ADMIN
When two FileExplorers, used in ThumbnailsView mode, are added to a page from a user control, the navigation through the trees of both FileExplorers updates the ListView of the first explorer.

Last Updated: 05 Feb 2016 11:55 by ADMIN
The issue is reproducible with RadEditor. When using Lightweight rendering in RadEditor, the FileExplorer's address bar has an inline style with height: 16px rule. This rule should be added only in Classic rendering.

As a side effect, the text in the address box is cut off. 

Possible workaround is to add setting in the web.config to force Lightweight rendering for RadFileExplorer:

<add key="Telerik.Web.UI.FileExplorer.RenderMode" value="lightweight" />
Last Updated: 03 Aug 2015 13:10 by ADMIN
Clicking on the FileExplorer's Refresh button does not refresh the pager of the control properly when the currently selected page in the grid/listview is bigger than 1.

Steps to reproduce:
1. Open
2. Navigate to some page (e.g. 3) in the FileExplorer's grid/listview
3. Refresh the control (click the "Refresh" button on the toolbar)

Result: FileExplorer shows the content if the first page, while the pager keeps the state from before the refresh (e.g. 3).
Last Updated: 29 Jul 2016 13:51 by ADMIN
The current page FileList items are not properly updated when the paging is enabled. Returning to a previously paged folder is properly restored to page 1, but it keeps showing the content of lastly listed page. The issue is reproducible in all explorer modes of the control.

Video -
Last Updated: 22 Jul 2016 07:12 by ADMIN
When trying to drag files with not-so-common extensions to upload, they are not uploaded.

For the time being, you can workaround the issue by using this patch:

<telerik:RadFileExplorer runat="server" ID="RFE1">
    <Configuration ViewPaths="~/" UploadPaths="~/" DeletePaths="~/" SearchPatterns="*.*"/>

    Telerik.Web.UI.RadFileExplorer.prototype._onAsyncUploadFilesUploading = function (sender, args) {
        var currentDroppedFileType = this._pullNextDroppedFileType();
        if (this._isDropUploadCancelled === true) {
            if (this._isThisLastUploadingFile()) this._finalizeFileDrop();
        this._currentUploadRow = args.get_row();

        if (this._btnUpload != null) {
Last Updated: 11 Nov 2014 12:35 by ADMIN
This problem is reproducible with the FileExplorer control only when is set with a thumbnails view-mode. 
Last Updated: 20 Oct 2014 16:16 by ADMIN
When a RadConfirm dialog appears on deleting or another user action is performed a dialog is opened with OK and Cancel button. The localization properties of these buttons can be altered via the RadEditor.Dialogs.resx, although modifying the valu eof the Common_OK property does not change the button's text. 

The following workaround changes the localization used by the RadWindowManager used by the FileExplorer and modifies the value as per to the desired one.

<script type="text/javascript">
	function OnClientLoad(sender, args) {
		var currentLocalization = sender.get_windowManager().get_localization();
		// Change the OK button localization value with "MyCustomOK"
		var myLocalization = currentLocalization.replace("\"OK\":\"OK\"", "\"OK\":\"MyCustomOK\"");


<telerik:RadFileExplorer runat="server" ID="RadFileExplorer1" OnClientLoad="OnClientLoad">
	<Configuration ViewPaths="~/" DeletePaths="~/" />
Last Updated: 16 Feb 2016 06:48 by ADMIN
Created by: Danail Vasilev
Comments: 0
Category: FileExplorer
Type: Bug Report

Last Updated: 19 Jan 2017 09:35 by ADMIN
The following setup will cause an Invalid Argument error in IE8:

			<div style="display: none;">
					<telerik:RadFileExplorer runat="server" ID="RadFileExplorer1"
											 Width="700px" Height="520px" RenderMode="Lightweight">
											 <Configuration ViewPaths="~/images" />

It can extend to a FileExplorer in a MultiPage, for example.

Solution for the time being is to avoid using RenderMode=Lightweight for IE8
Last Updated: 18 Dec 2015 13:20 by ADMIN
When the height of FileExplrorer is bigger that the current view port and an item from its right pane is selected, the content of the page jumps (the active element is brought to the top corner of the page).

Last Updated: 05 Aug 2016 08:33 by ADMIN
When an image in the list view of FileExplorer is dropped outside the dialog, a duplicate of this image is stuck to the cursor. After selecting another image, the ghost image remains and overlays the upload window.  Follow the attached clip.

Steps to reproduce:
1. Open FileExplorer in Thumbnails mode (or open Editor's Image Manager);
2. Select an image and start dragging it;
3. Drop it outside the dialog;
4. Observe the ghost image on the cursor;
5. Select another image;

Result: The ghost image is not removed and overlays another dialogs.
Last Updated: 17 Mar 2015 07:19 by Imported User
A JavaScriptError is thrown when FileExplorer with enabled AsyncUplaod is used for multiple files uploading in IE. The message of the error is:
JavaScript runtime error: Object doesn't support property or method 'get_allowMultiRowSelection'

Steps to reproduce:
1. Open in IE10
2. Open the FileExplorer's Upload dialog
3. Select 2 or more files for upload
4. Click the Upload button

Result: A JavaScript error is thrown.
Last Updated: 05 Sep 2013 10:01 by Anatoliy
have found similar issue :
which look like has been fixed, but unfortunately for following case it doesn't:
We still have performance issue, in following situations:
   - when content root folder contains few (1-5) subfolders
   - one of subfolder contains lot of (200-500) sub-subfolders 

then first time RadFileExplorer  loading to long (aproximatelly 3-5min). after some researching has been found that problem in the method:  

     private bool HasSubFolders(string virtualPath);

which instead of simply check that folder isn't empty (exist any one file or directory)  always construct complete version of the subtree (in the example above - subtree contains 200-500 subfolders, each of them checking for content, permission etc - that is why it takes time). Probable to check that node  HasSubFolders, RadFileExplorer  could execute new virtual method of the FileSystemContentProvider bool HasSubFolders. In that case: FileSystemContentProvider (or inherited classes) will decide that Folder contains SubFolders.
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