/// <summary>
/// This allows us to ensure that the lazy load script is placed higher in the rendered html than either the css or the js rendered to the page.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <remarks>
/// TO accomplish this we detect if the http context has a special key (PlaceholderReplacementProcessing), if so we'll replace the first encountered
/// token with the lazy load script and replace any other ones with empty text (so it is only loaded once). We need to do this because we have no
/// idea if the developer has rendered the lazy css or lazy js first.
/// </remarks>
static void PlaceholdersReplaced(object sender, PlaceholdersReplacedEventArgs e)
{
if (e.HttpContext.Items[PlaceholderReplacementProcessing] is bool &&
(bool)e.HttpContext.Items[PlaceholderReplacementProcessing])
{
var url = GetWebResourceUrl(typeof(LazyLoadProvider), DependencyLoaderResourceName);
var lazyScriptTag = string.Format(HtmlEmbedContants.ScriptEmbedWithSource, url, "");
//replace the first occurance
e.ReplacedText = e.ReplacedText.ReplaceFirst(LazyLoadScriptPlaceholder, lazyScriptTag);
//replace the rest with nothing
e.ReplacedText = e.ReplacedText.Replace(LazyLoadScriptPlaceholder, "");
//set the flag to null so we don't process again
e.HttpContext.Items[PlaceholderReplacementProcessing] = null;
}
}
/// <summary>
/// This allows us to ensure that the lazy load script is placed higher in the rendered html than either the css or the js rendered to the page.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <remarks>
/// TO accomplish this we detect if the http context has a special key (PlaceholderReplacementProcessing), if so we'll replace the first encountered
/// token with the lazy load script and replace any other ones with empty text (so it is only loaded once). We need to do this because we have no
/// idea if the developer has rendered the lazy css or lazy js first.
/// </remarks>
static void PlaceholdersReplaced(object sender, PlaceholdersReplacedEventArgs e)
{
if (e.HttpContext.Items[PlaceholderReplacementProcessing] is bool
&& (bool)e.HttpContext.Items[PlaceholderReplacementProcessing])
{
var url = GetWebResourceUrl(typeof(LazyLoadProvider), DependencyLoaderResourceName);
var lazyScriptTag = string.Format(HtmlEmbedContants.ScriptEmbedWithSource, url, "");
//replace the first occurance
e.ReplacedText = e.ReplacedText.ReplaceFirst(LazyLoadScriptPlaceholder, lazyScriptTag);
//replace the rest with nothing
e.ReplacedText = e.ReplacedText.Replace(LazyLoadScriptPlaceholder, "");
//set the flag to null so we don't process again
e.HttpContext.Items[PlaceholderReplacementProcessing] = null;
}
}
