How to access all the child elements of an HTML element in the HTMLUI control?
3 Sep 20203 minutes to read
The IHTMLElement.Children property of any IHTMLElement, collects all the child elements of a specified HTML element inside an IHTMLElementsCollection. You can access the elements needed for your conditions from this collection.
The following code snippet illustrates how the child elements of the Body element in the given HTML document are searched to access elements containing the OnClick attribute and how a Click event is attached to those elements.
<html>
<head>
<style>.nav{"background-color:#dae5f5"}</style>
</head>
<body>
<p/>
<img src="sync.jpg" id="img1" class="nav"/>
<p/>
<div>This is a sample</div>
</body>
</html>private void htmluiControl1_LoadFinished(object sender, System.EventArgs e)
{
//Getting the body element in the HTML document
IHTMLElement[] body = this.htmluiControl1.Document.GetElementsByName("body");
//Collecting the children of the body element in a collection
IHTMLElementsCollection elem = body[0].Children;
foreach (IHTMLElement child in elem)
{
//searching for the children containing the OnClick attribute
if (child.Attributes.Contains("ONCLICK") == true)
{
//Click event declaration for current children
child.Click += new EventHandler(child_Click);
}
}
}
private void child_Click(object sender, EventArgs e)
{
BubblingEventArgs argument = HTMLUIControl.GetBublingEventArgs(e);
//Accessing the element that is sending the event
BaseElement elem = argument.RootSender as BaseElement;
//Validating the element for execution
if (elem.ID == "img1" && elem is IMGElementImpl)
{
if (elem.Attributes["src"].Value == "sync.jpg")
elem.Attributes["src"].Value = "syncfusion.gif";
else
elem.Attributes["src"].Value = "sync.jpg";
this.htmluiControl1.ScrollToElement(elem);
}
}Private Sub htmluiControl1_LoadFinished(ByVal sender As Object, ByVal e As System.EventArgs)
'Getting the body element in the HTML document
Dim body As IHTMLElement() = Me.htmluiControl1.Document.GetElementsByName("body")
'Collecting the children of the body element in a collection
Dim elem As IHTMLElementsCollection = body(0).Children
For Each child As IHTMLElement In elem
'searching for the children containing the OnClick attribute
If child.Attributes.Contains("ONCLICK") = True Then
'Click event declaration for current children
AddHandler child.Click, AddressOf child_Click
End If
Next child
End Sub
Private Sub child_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim argument As BubblingEventArgs = HTMLUIControl.GetBublingEventArgs(e)
'Accessing the element that is sending the event
Dim elem As BaseElement = CType(IIf(TypeOf argument.RootSender Is BaseElement, argument.RootSender, Nothing), BaseElement)
'Validating the element for execution
If elem.ID = "img1" AndAlso TypeOf elem Is IMGElementImpl Then
If elem.Attributes("src").Value = "sync.jpg" Then
elem.Attributes("src").Value = "syncfusion.gif"
Else
elem.Attributes("src").Value = "sync.jpg"
End If
Me.htmluiControl1.ScrollToElement(elem)
End If
End Sub