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I have a project that I am working on in VS2005. I have added a WebBrowser control. I add a basic empty page to the control
private const string _basicHtmlForm = "<html> "
+ "<head> "
+ "<meta http-equiv='Content-Type' content='text/html; charset=utf-8'/> "
+ "<title>Test document</title> "
+ "<script type='text/javascript'> "
+ "function ShowAlert(message) { "
+ " alert(message); "
+ "} "
+ "</script> "
+ "</head> "
+ "<body><div id='mainDiv'> "
+ "</div></body> "
+ "</html> ";
private string _defaultFont = "font-family: Arial; font-size:10pt;";
private void LoadWebForm()
{
try
{
_webBrowser.DocumentText = _basicHtmlForm;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
and then add various elements via the dom (using _webBrowser.Document.CreateElement). I am also loading a css file:
private void AddStyles()
{
try
{
mshtml.HTMLDocument currentDocument = (mshtml.HTMLDocument) _webBrowser.Document.DomDocument;
mshtml.IHTMLStyleSheet styleSheet = currentDocument.createStyleSheet("", 0);
TextReader reader = new StreamReader(Path.Combine(Path.GetDirectoryName(Application.ExecutablePath),"basic.css"));
string style = reader.ReadToEnd();
styleSheet.cssText = style;
}
catch(Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Here is the css page contents:
body {
background-color: #DDDDDD;
}
.categoryDiv {
background-color: #999999;
}
.categoryTable {
width:599px; background-color:#BBBBBB;
}
#mainDiv {
overflow:auto; width:600px;
}
The style page is loading successfully, but the only elements on the page that are being affected are the ones that are initially in the page (body and mainDiv). I have also tried including the css in a element in the header section, but it still only affects the elements that are there when the page is created.
So my question is, does anyone have any idea on why the css is not being applied to elements that are created after the page is loaded? I have also tried no applying the css until after all of my elements are added, but the results don't change.
865
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I made a slight modification to your AddStyles() method and it works for me. Where are you calling it from? I called it from "_webBrowser_DocumentCompleted".
I have to point out that I am calling AddStyles after I modify the DOM.
private void AddStyles()
{
try
{
if (_webBrowser.Document != null)
{
IHTMLDocument2 currentDocument = (IHTMLDocument2)_webBrowser.Document.DomDocument;
int length = currentDocument.styleSheets.length;
IHTMLStyleSheet styleSheet = currentDocument.createStyleSheet(@"", length + 1);
//length = currentDocument.styleSheets.length;
//styleSheet.addRule("body", "background-color:blue");
TextReader reader = new StreamReader(Path.Combine(Path.GetDirectoryName(Application.ExecutablePath), "basic.css"));
string style = reader.ReadToEnd();
styleSheet.cssText = style;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Here is my DocumentCompleted handler (I added some styles to basic.css for testing):
private void _webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
HtmlElement element = _webBrowser.Document.CreateElement("p");
element.InnerText = "Hello World1";
_webBrowser.Document.Body.AppendChild(element);
HtmlElement divTag = _webBrowser.Document.CreateElement("div");
divTag.SetAttribute("class", "categoryDiv");
divTag.InnerHtml = "<p>Hello World2</p>";
_webBrowser.Document.Body.AppendChild(divTag);
HtmlElement divTag2 = _webBrowser.Document.CreateElement("div");
divTag2.SetAttribute("id", "mainDiv2");
divTag2.InnerHtml = "<p>Hello World3</p>";
_webBrowser.Document.Body.AppendChild(divTag2);
AddStyles();
}
This is what I get (modified the style to make it as ugly as a single human being can hope to make it :D ):
173
one solution is to inspect the html prior to setting the DocumentText and inject CSS on the client side. I don't set the control url property but rather get the HTML via WebCLient and then set the DocumentText. maybe setting DocumentText (or in your case Document) after you manipulate the DOM could get it to re-render properly
private const string CSS_960 = @"960.css";
private const string SCRIPT_FMT = @"<style TYPE=""text/css"">{0}</style>";
private const string HEADER_END = @"</head>";
public void SetDocumentText(string value)
{
this.Url = null; // can't have both URL and DocText
this.Navigate("About:blank");
string css = null;
string html = value;
// check for known CSS file links and inject the resourced versions
if(html.Contains(CSS_960))
{
css = GetEmbeddedResourceString(CSS_960);
html = html.Insert(html.IndexOf(HEADER_END), string.Format(SCRIPT_FMT,css));
}
if (Document != null) {
Document.Write(string.Empty);
}
DocumentText = html;
}
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