JavaScript Actions

Updated on Feb 19, 2026

Minimum Version	Q4 2024

RadPdfProcessing provides support for:

• JavaScript actions associated with documents, pages, form fields, etc.
• Event triggered actions - represent actions that can be executed after a certain event in the respective viewer (e.g. RadPdfViewer, Adobe or a web browser) is triggerred.

JavaScript Actions are represented by the JavaScriptAction class storing in its public Script property the JS content as plain text.

JS actions can be added by using the public Actions property of the following classes:

Class	Collection Type
Link*	ActionCollection
BookmarkItem*	ActionCollection
Widget	WidgetActionCollection
FormField	FormFieldActionCollection
RadFixedDocument	DocumentActionCollection
RadFixedPage	PageActionCollection

* The existing Action property is obsolete.

Adding a JavaScript Action to a TextBoxField

The following example demonstrates how to create a PDF document with three TextBoxFields where the third field calculates the sum of the values entered in the first two widgets:

c#

RadFixedDocument document = new RadFixedDocument();
document.Pages.AddPage();

TextBoxField field1 = new TextBoxField("Field1");
VariableContentWidget widget1 = field1.Widgets.AddWidget();
widget1.Rect = new Rect(0, 0, 150, 30);

TextBoxField field2 = new TextBoxField("Field2");
VariableContentWidget widget2 = field2.Widgets.AddWidget();
widget2.Rect = new Rect(0, 50, 150, 30);

TextBoxField totalField = new TextBoxField("Total");
totalField.IsReadOnly = true;
totalField.Actions.Calculate = new Telerik.Windows.Documents.Fixed.Model.Actions.JavaScriptAction
    ("AFSimple_Calculate(\"SUM\", new Array (\"Field1\", \"Field2\"));");
VariableContentWidget totalWidget = totalField.Widgets.AddWidget();
totalWidget.Rect = new Rect(0, 100, 150, 30);

document.AcroForm.FormFields.Add(field1);
document.AcroForm.FormFields.Add(field2);
document.AcroForm.FormFields.Add(totalField);
document.Pages[0].Annotations.Add(widget1);
document.Pages[0].Annotations.Add(widget2);
document.Pages[0].Annotations.Add(totalWidget);

Using the MergedJavaScriptNameResolving Event

The event is fired when trying to resolve conflicts between the JavaScript names while merging RadFixedDocument instances.

c#

document.MergedJavaScriptNameResolving += (sender, e) =>
{
    if (e.UsedNames.Contains(e.Name))
    {
        e.NewName = e.Name + "1";
    }
};

See Also

• FormField
• FormFieldCollection class
• Widgets
• Multiplying TextBoxField Values with JavaScript Actions and RadPdfProcessing