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You can find here more details about the usage of the client-side set_html() method.

The method can accept 4 parameters:

set_html(content, title, setFocus, raiseSelChanged)

The table below shows more details about their purpose:

Method's Parameters

Parameter Type Description
content String The HTML content, that will be set in Telerik RadEditor.
title String The command's title shown in the Undo stack. This is an optional parameter, the default value is " Set HTML ".
setFocus Boolean Specifies whether setFocus to be fired after the command execution. This is an optional parameter, the default value is true. When true the cursor will appear at the beggining of the content placed.
raiseSelChanged Boolean Indicates whether to raise selectioChange event. This is an optional parameter, the default value is true .

The example below demonstrates how to clean the content in the content area from a standard input button:

<telerik:radeditor runat="server" ID="RadEditor1">
       Here is sample content!
<input type="button" value="reset" onclick="ResetContent();return false;" />
<script type="text/javascript">
    function ResetContent() {
        var editor = $find("<%=RadEditor1.ClientID%>"); //get a reference to RadEditor client object
        editor.set_html(""); //reset the content

Avoid calling set_html() in Preview Mode, because the content is no longer editable in this mode and tampering with it can cause errors. Here's how to make sure you avoid that:

    function setNewContent() {
        var editor = $find("<%=RadEditor1.ClientID%>");
        if (editor.get_mode() < 4) { //1 and 2 are Design and HTML modes respectively
            editor.set_html("new content " + new Date());
<asp:Button Text="set content" OnClientClick="setNewContent(); return false;" runat="server" />
<telerik:RadEditor runat="server" ID="RadEditor1" RenderMode="Lightweight">
    lorem ipsum
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