getting absolute position of HTML element in webbrowser control with C#
here is the solution I got so far:
// set the size of our web browser to be the same size as the image
int width, height;
width = webBrowser1.Document.Images[0].ClientRectangle.Width;
height = webBrowser1.Document.Images[0].ClientRectangle.Height;
webBrowser1.Width = width;
webBrowser1.Height = height;
//scroll vertically to that element
webBrowser1.Document.Images[0].OffsetParent.ScrollIntoView(true);
//calculate x, y offset of the element
int x = webBrowser1.Document.Images[s].OffsetRectangle.Left +
webBrowser1.Document.Images[s].OffsetParent.OffsetRectangle.Left +
webBrowser1.Document.Images[s].OffsetParent.OffsetParent.OffsetRectangle.Left+
webBrowser1.Document.Images[s].OffsetParent.OffsetParent.OffsetParent.OffsetRectangle.Left+
webBrowser1.Document.Images[s].OffsetParent.OffsetParent.OffsetParent.OffsetParent.OffsetRectangle.Left;
int y = webBrowser1.Document.GetElementsByTagName("HTML")[0].ScrollTop;
//now scroll to that element
webBrowser1.Document.Window.ScrollTo(x, y);
now this code works perfectly.. but there is an issue with calculating the offsets. I need to calculate the offsetparent of the element then calculate the offsetparent of the offsetparent etc.. I need to do that dynamically not adding it one by one.. I don't know how to do that. any ideas?
EDIT: here is my last and final version and it works with any html element it will find the absolute position of any element I want..
public int getXoffset(HtmlElement el)
{
//get element pos
int xPos = el.OffsetRectangle.Left;
//get the parents pos
HtmlElement tempEl = el.OffsetParent;
while (tempEl != null)
{
xPos += tempEl.OffsetRectangle.Left;
tempEl = tempEl.OffsetParent;
}
return xPos;
}
public int getYoffset(HtmlElement el)
{
//get element pos
int yPos = el.OffsetRectangle.Top;
//get the parents pos
HtmlElement tempEl = el.OffsetParent;
while (tempEl != null)
{
yPos += tempEl.OffsetRectangle.Top;
tempEl = tempEl.OffsetParent;
}
return yPos;
}
then use the position with:
//now scroll to that element
webBrowser1.Document.Window.ScrollTo(x, y);
done!
I like previous answers but iterating through parent objects twice is not very effective. Remember - you're working with COM/ActiveX here. This works much faster:
public Point GetOffset(HtmlElement el)
{
//get element pos
Point pos = new Point(el.OffsetRectangle.Left, el.OffsetRectangle.Top);
//get the parents pos
HtmlElement tempEl = el.OffsetParent;
while (tempEl != null)
{
pos.X += tempEl.OffsetRectangle.Left;
pos.Y += tempEl.OffsetRectangle.Top;
tempEl = tempEl.OffsetParent;
}
return pos;
}
and then
var point = GetOffset(element);
var x = point.X;
var y = point.Y;
Thank you, it works like a charm. I had to rewrite it as VB, and just want to share the solution:
Function GetXOffSet(ByVal elem As HtmlElement) As Integer
Dim xPos As Integer = elem.OffsetRectangle.Left
Dim tElm As HtmlElement = elem.OffsetParent
Dim trig As Boolean = False
While Not trig
Try
xPos += tElm.OffsetRectangle.Left
tElm = tElm.OffsetParent
Catch ex As Exception
trig = True
End Try
End While
Return xPos
End Function
Function GetYOffSet(ByVal elem As HtmlElement) As Integer
Dim yPos As Integer = elem.OffsetRectangle.Top
Dim tElm As HtmlElement = elem.OffsetParent
Dim trig As Boolean = False
While Not trig
Try
yPos += tElm.OffsetRectangle.Top
tElm = tElm.OffsetParent
Catch ex As Exception
trig = True
End Try
End While
Return yPos
End Function