CODEWITHSUNDEEP
javascriptc#htmlwinformswebbrowser-control
Chathurika Senani
Chathurika Senani

Reputation: 756

Detect scroll to bottom in WebBrowser control

I am creating a Windows Form to accept some terms and conditions for a company. So the terms and conditions are on the web and it is navigated to the WinForm through WebBrowser control. It is required to enable the Accept button only after the full document is scrolled to the bottom. I am searching for an Event similar to ValueChanged Event in VScrollBar control(mentioned below) or any other option.

private void vScrollBar1_ValueChanged(object sender, EventArgs e)
    {
        if (vScrollBar1.Value+9 == vScrollBar1.Maximum)
        {
            acceptBtn.Enabled = true;
        }
    }

Upvotes: 2

Views: 1590

Answers (2)

Reza Aghaei
Reza Aghaei

Reputation: 125197

You should handle onscroll event of window object and check if scrollHeight - scrollTop equals to clientHeight for documentElement. To do so:

private void webBrowser1_DocumentCompleted(object sender, 
    WebBrowserDocumentCompletedEventArgs e)
{
    this.webBrowser1.Document.Window.AttachEventHandler("onscroll", OnScroll);
}

void OnScroll(object sender, EventArgs e)
{
    var script =
    @"(function()
       {
           var e = document.documentElement;
           if (e.scrollHeight - e.scrollTop === e.clientHeight)
               return true;
           else
               return false;
       })();";
    var result = webBrowser1.Document.InvokeScript("eval", new object[] { script });
    if ((bool)result)
        MessageBox.Show("Scrolled to end!");
}

Upvotes: 2

Mats391
Mats391

Reputation: 1209

The scrollbar is not part of the WebBrowser control, but of the Html displayed. You have to subscribe to the Scroll event of the Window of the displayed Document

webBrowser1.Document.Window.Scroll += MyScrollCode;

https://msdn.microsoft.com/en-us/library/system.windows.forms.htmlwindow.scroll(v=vs.110).aspx

Upvotes: 1

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