/// <summary>
/// Resolve all script dependencies in the bound CQ document. Scripts that cotain a "data-
/// location='head'" attribute will be moved to the head.
/// </summary>
///
/// <param name="doc">
/// The document to resolve.
/// </param>
public void ResolveScriptDependencies(CQ doc)
{
string scriptSelector = "script[src][type='text/javascript'], script[src]:not([type]), link[type='text/css']";
CQ scripts = doc[scriptSelector];
if (scripts.Length == 0)
{
return;
}
// move scripts first
// TODO: Optimize using a query caching mechanism so
foreach (var item in scripts.Filter("[data-moveto]"))
{
var target = doc.Select(item["data-moveto"]);
if (target.Length > 0)
{
target.First().Append(item);
item.RemoveAttribute("data-moveto");
}
}
// resolve dependencies
ScriptCollection coll = new ScriptCollection(ScriptEnvironment);
coll.Options = Options;
// identify the insertion point for the script bundle. AddFromCq returns the first script with dependencies,
// so scripts should be added right before that one. Otherwise they should be added
// at the end of head.
var firstScriptEl = coll.AddFromCq(scripts);
CQ firstScript = null;
if (firstScriptEl != null)
{
firstScript = firstScriptEl.Cq();
}
string bundleUrl;
List <ScriptRef> dependencies = coll.GetDependencies()
.Where(item => !coll.Contains(item))
.ToList();
// Now add scripts directly for dependencies marked as NoCombine.
var inlineScripts = Options.HasFlag(ViewEngineOptions.NoBundle) ?
dependencies :
dependencies.Where(item => item.NoCombine);
foreach (var item in inlineScripts)
{
var script = GetScriptHtml(item.Path, item.ScriptHash);
if (firstScript != null)
{
firstScript.Before(script);
}
else
{
firstScript = script;
doc["body"].Append(script);
}
}
// Before creating the bundle, remove any duplicates of the same script on the page
if (!Options.HasFlag(ViewEngineOptions.NoBundle))
{
bool hasBundle = Bundles.TryGetValue(coll, out bundleUrl);
if (hasBundle)
{
// when nocache is set, we will regenerate the bundle, but not change the script ID. The v=
// flag will be changed by BundleTable.
if (Options.HasFlag(ViewEngineOptions.NoCache))
{
string removeUrl = "~" + bundleUrl.Before("?");
BundleTable.Bundles.Remove(BundleTable.Bundles.GetBundleFor(removeUrl));
hasBundle = false;
ScriptID++;
// this code attempts to un-cache the bundle, it doesn't work.
// leaving it here until some permanent solution is found as a reminder
//
// http://stackoverflow.com/questions/12317391/how-to-force-bundlecollection-to-flush-cached-script-bundles-in-mvc4
//
//var bundleList = BundleTable.Bundles.ToList();
//BundleTable.Bundles.Clear();
//BundleTable.Bundles.ResetAll();
//BundleTable.EnableOptimizations = false;
//foreach (var oldBundle in bundleList)
//{
// BundleTable.Bundles.Add(oldBundle);
//}
}
}
else
{
ScriptID++;
}
if (!hasBundle)
{
var activeDependencies = dependencies.Where(item => !item.NoCombine).ToList();
if (activeDependencies.Count > 0)
{
string bundleAlias = "~/cqbundle" + ScriptID;
var bundle = GetScriptBundle(bundleAlias);
foreach (var item in activeDependencies)
{
bundle.Include(item.Path);
}
BundleTable.Bundles.Add(bundle);
if (HttpContext.Current != null)
{
bundleUrl = BundleTable.Bundles.ResolveBundleUrl(bundleAlias, true);
}
else
{
bundleUrl = bundleAlias + "_no_http_context";
}
Bundles[coll] = bundleUrl;
}
}
var scriptPlaceholder = scripts.First();
// add bundle after all noncombined scripts
if (!String.IsNullOrEmpty(bundleUrl))
{
firstScript.Before(GetScriptHtml(bundleUrl));
}
}
}