JavaScript Events

Invoking JavaScript Events

Telerik Testing Framework allows you to invoke JavaScript events directly with or without event arguments. For example:

C#

// Invoke the OnFocus event
HtmlButton b = Find.ById<HtmlButton>("b");
b.InvokeEvent(ScriptEventType.OnFocus);
// or
Actions.InvokeEvent(b.BaseElement, ScriptEventType.OnFocus);
 
// To invoke an event with an argument do something like this
HtmlTextArea area1 = Find.ById<HtmlTextArea>("area1");
Element body1 = Find.ById("body1");
 
MouseEvent me = new MouseEvent();
me.Type = "mouseover";
me.SetRelatedTarget(body1);
area1.InvokeEvent(me);

VB

' Invoke the OnFocus event
Dim b As HtmlButton = Find.ById(Of HtmlButton)("b")
b.InvokeEvent(ScriptEventType.OnFocus)
' or
Actions.InvokeEvent(b.BaseElement, ScriptEventType.OnFocus)
 
' To invoke an event with an argument do something like this
Dim area1 As HtmlTextArea = Find.ById(Of HtmlTextArea)("area1")
Dim body1 As Element = Find.ById("body1")
 
Dim [me] As New MouseEvent()
[me].Type = "mouseover"
[me].SetRelatedTarget(body1)
area1.InvokeEvent([me])

JavaScript Event Handlers

The framework gives you the ability to attach a .NET event handler to your JavaScript happening in the browser. Start by defining your event handler like this:

C#

private volatile bool _clickHandled;
private System.Threading.AutoResetEvent _clickARE;
 
private void OnClick(object sender, JavascriptEventArgs e)
{
    _clickHandled = true;
    _clickARE.Set();
}

VB

Private _clickHandled As Boolean
_clickHandled
Private _clickARE As System.Threading.AutoResetEvent
 
Private Sub OnClick(ByVal sender As Object, ByVal e As JavascriptEventArgs)
    _clickHandled = True
    _clickARE.[Set]()
End Sub

All that's left is to attach the event handler to an element on the DOM like this:

C#

[TestMethod]
public void ClickHandler()
{
    _clickARE = new System.Threading.AutoResetEvent(false);
    _clickHandled = false;
 
    HtmlButton b = Find.ById<HtmlButton>("b");
 
    // Attach a listener to the click event on the button.
    b.AddEventListener("click", OnClick);
 
    // Invoke the event.
    b.InvokeEvent(ScriptEventType.OnClick);
 
    // Wait until the event is fired.
    _clickARE.WaitOne(500);
 
    Assert.IsTrue(_clickHandled);
}

VB

<TestMethod()> _
Public Sub ClickHandler()
    _clickARE = New System.Threading.AutoResetEvent(False)
    _clickHandled = False
 
    Dim b As HtmlButton = Find.ById(Of HtmlButton)("b")
 
    ' Attach a listener to the click event on the button.
    b.AddEventListener("click", AddressOf OnClick)
 
    ' Invoke the event.
    b.InvokeEvent(ScriptEventType.OnClick)
 
    ' Wait until the event is fired.
    _clickARE.WaitOne(500)
 
    Assert.IsTrue(_clickHandled)
End Sub