RadUpload has been replaced by RadAsyncUpload, Telerik’s next-generation ASP.NET upload component. If you are considering Telerik’s Upload control for new development, check out the documentation of RadAsyncUpload or the control’s product page. If you are already using RadUpload in your projects, you may be interested in reading how easy the transition to RadAsyncUpload is and how you can benefit from it in this blog post. The official support for RadUpload has been discontinued in June 2013 (Q2’13), although it is still be available in the suite. We deeply believe that RadAsyncUpload can better serve your upload needs and we kindly ask you to transition to it to make sure you take advantage of its support and the new features we constantly add to it.
The visibility of the RadUpload UI elements is controlled by the ControlObjectsVisibility property. You can optionally show or hide any of the elements(other than the file input area):
The check box for selecting rows appears if ControlObjectsVisibility includes "CheckBoxes".
The Clear button appears on each row if ControlObjectsVisibility includes ""ClearButtons"
The Remove button appears on each row if ControlObjectsVisiblity includes "RemoveButtons".
The Add button for adding rows appears if ControlObjectsVisibility includes "AddButton"
The Delete Selected button appears if ControlObjectsVisibility includes "DeleteSelectedButton".
Most of the RadUpload UI elements are for letting the user add and remove rows to change the number of files that are uploaded. Two properties let you control the number of rows:
The InitialFileInputsCount property determines the number of rows that appear when the RadUpload control is first loaded.
The MaxFileInputsCount property specifies the maximum number of rows that can appear in the RadUpload control. Once the RadUpload control contains this number of rows, the Add button is disabled until a row is deleted. Here you can find out how to implement minimum file inputs count.
By default, the user can enter select a file either by typing in the file input area or by clicking the Select button and picking a file using a file browser. You can prevent users from typing directly in the file input area, requiring them to select files using the browser, by setting the ReadOnlyFileInputs property to true.
The following example shows a RadUpload control with three input areas. The MaxFileInputsCount property sets this as a maximum. The ControlObjectsVisibility property is set to include all controls except the check boxes for selecting rows and the delete button that deletes buttons selected this way:
<telerik:radupload runat="server" id="RadUpload1" initialfileinputscount="3" maxfileinputscount="3" controlobjectsvisibility="RemoveButtons,ClearButtons,AddButton" />
When assigning the ControlObjectsVisibility property at runtime, use the "or" operator to combine values:
RadUpload1.ControlObjectsVisibility = ControlObjectsVisibility.RemoveButtons | ControlObjectsVisibility.ClearButtons | ControlObjectsVisibility.AddButton;
RadUpload1.ControlObjectsVisibility = _ ControlObjectsVisibility.RemoveButtons Or _ ControlObjectsVisibility.ClearButtons Or _ ControlObjectsVisibility.AddButton