Customizing NewLineMode Behavior in RadEditor for ASP.NET AJAX

Environment

Product	RadEditor for ASP.NET AJAX
Version	all

Description

When using RadEditor's NewLineMode with the default value of "P", pressing Enter when the selection is in a div element creates a new div instead of a new paragraph. This behavior is undesirable and we want to customize it to create a new paragraph inside the div instead.

Solution

To achieve the desired behavior, you can check programmatically whether the selection is in a div element and override the default EnterNewLine command to insert a paragraph. After that move the selection inside the paragraph using its unique marker:

<script type="text/javascript">
    function OnClientCommandExecuting(sender, args) {
        if (args.get_commandName() === "EnterNewLine") {
            var editor = sender;
            var selection = editor.getSelection();
            var parentElement = selection.getParentElement();

            // Check if the selection's parent element is a DIV
            if (parentElement && parentElement.tagName.toLowerCase() === "div") {
                // Prevent the default Enter key behavior only if inside a DIV
                args.set_cancel(true);

                // Insert a paragraph with a uniquely identifiable span (marker) for cursor placement
                var uniqueMarker = '<p><span id="cursorPlaceholder">&#8203;</span></p>';
                editor.pasteHtml(uniqueMarker);

                setTimeout(function () {
                    var doc = editor.get_document();
                    var placeholder = doc.getElementById("cursorPlaceholder");
                    if (placeholder) {
                        if (editor.selectElement) {
                            editor.selectElement(placeholder);
                        }

                        // Remove or replace the placeholder to leave the cursor in place
                        placeholder.outerHTML = "&#8203;"; // Replaces the placeholder with a zero-width space
                    }
                }, 0); // Short delay to ensure DOM updates
            }
            // If not inside a DIV, the default behavior will occur automatically since args.set_cancel(true) is not called
        }
    }
</script>
<telerik:RadEditor runat="server" ID="RadEditor1" OnClientCommandExecuting="OnClientCommandExecuting"
    NewLineMode="P">
    <Content>
        <p>para</p>
        <div>longtext</div>
        <p>para</p>
    </Content>
</telerik:RadEditor>

This code solution overrides the default behavior of the Enter key when the NewLineMode is set to "P" and the selection's parent element is a div. Instead of creating a new div, it inserts a new paragraph inside the div. The code uses a unique marker span to maintain the cursor position during the insertion.

Please note that this solution requires JavaScript knowledge and may need to be adjusted based on your specific implementation.