protected override void Process2(ref CombinerFilterContext data)
{
// This filter will execute only if the scripts haven't been combined,
// since the combiner filter does the versioning as well.
// This is done for performance reasons to avoid having to traverse the
// document tree again.
if (!data.CombineCss && data.VersionOnly)
{
string versionQueryString = data.CombinerService.GetVersionQueryString(data.JsVersion,
data.SharedVersion);
if (CssNodes == null)
{
return;
}
var cssNodes = CssNodes.ToList();
foreach (HtmlNode css in cssNodes)
{
string src = css.Attributes["href"].Value;
string querySeparator = (src.IndexOf('?') > 0 ? "&" : "?");
css.Attributes["href"].Value += querySeparator + versionQueryString;
}
}
}
/// <summary>
/// Replaces all local css tags on the page with a tag pointing to the combined resources
/// of the tags removed. Appends the combined resources tag to the head of the document.
/// Versions the resulting combined css tag (for performance reasons we're combining this operation in this filter).
/// </summary>
protected override void Process2(ref CombinerFilterContext data)
{
if (!data.CombineCss)
{
return;
}
if (CssNodes == null)
{
return;
}
var cssNodes = CssNodes.ToList();
// Url pointing to the combined css of the tags removed
// We're sending only distinct urls in order to eliminate duplicate loads of the same file...
string[] combinedCssUrls =
data.CombinerService.GetCombinedCssUrls(
data.RequestPath,
cssNodes.Select(n => n.Attributes["href"].Value).Distinct().ToList(),
data.CssVersion,
data.SharedVersion,
data.CombinedResourcesUrl,
data.MinifyCss,
data.PrependCdnHostToImages);
// Remove all css tags
foreach (HtmlNode css in cssNodes)
{
css.ParentNode.RemoveChild(css, false);
}
// Insert the new combined css tag into the head element
var head = Doc.DocumentNode.SelectSingleNode("//head");
if (head == null)
{
throw new ApplicationException("Head element in dom is null(TagsParser)");
}
var sb = new StringBuilder();
foreach (string combinedCssUrl in combinedCssUrls)
{
sb.Append("<link rel='stylesheet' type='text/css' href='" + combinedCssUrl + "' />");
}
// We'll use this method of appending these nodes to the doc in order to avoid
// having to keep track of the index in the collection when creating nodes explicitly;
var temp = new HtmlDocument();
temp.LoadHtml(sb.ToString());
foreach (HtmlNode n in temp.DocumentNode.ChildNodes)
{
head.PrependChild(n);
}
}
