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Optimizing Html.UnorderedList

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This commit is contained in:
Sebastien Ros
2014-08-05 15:33:57 -07:00
parent 80be0de019
commit aa0abe7e86
1 changed files with 46 additions and 18 deletions
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64
src/Orchard/Mvc/Html/HtmlHelperExtensions.cs
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@@ -105,34 +105,62 @@ namespace Orchard.Mvc.Html {
}
private static IHtmlString UnorderedList<T>(IEnumerable<T> items, Func<T, int, IHtmlString> generateContent, string cssClass, Func<T, string> generateItemCssClass, Func<T, string> generateAlternatingItemCssClass) {
if (items == null || !items.Any()) return new HtmlString(string.Empty);
if(items == null) {
return new HtmlString(string.Empty);
}
// prevent multiple evaluations of the enumeration
items = items.ToArray();
if (!items.Any()) {
return new HtmlString(string.Empty);
}
var sb = new StringBuilder(250);
int counter = 0, count = items.Count() - 1;
sb.AppendFormat(
!string.IsNullOrEmpty(cssClass) ? "<ul class=\"{0}\">" : "<ul>",
cssClass
);
if(string.IsNullOrEmpty(cssClass)) {
sb.Append("<ul>");
}
else {
sb.Append("<ul class=\"")
.Append(cssClass)
.Append("\">");
}
foreach (var item in items) {
var sbClass = new StringBuilder(50);
if (counter == 0)
if (counter == 0) {
sbClass.Append("first ");
if (counter == count)
sbClass.Append("last ");
if (generateItemCssClass != null)
sbClass.AppendFormat("{0} ", generateItemCssClass(item));
if (counter % 2 != 0 && generateAlternatingItemCssClass != null)
sbClass.AppendFormat("{0} ", generateAlternatingItemCssClass(item));
}
sb.AppendFormat(
sbClass.Length > 0
? string.Format("<li class=\"{0}\">{{0}}</li>", sbClass.ToString().TrimEnd())
: "<li>{0}</li>",
generateContent(item, counter)
);
if (counter == count) {
sbClass.Append("last ");
}
if (generateItemCssClass != null) {
sbClass.Append(generateItemCssClass(item)).Append(" ");
}
if (counter % 2 != 0 && generateAlternatingItemCssClass != null) {
sbClass.AppendFormat(generateAlternatingItemCssClass(item)).Append(" ");
}
var clss = sbClass.ToString().TrimEnd();
if(String.IsNullOrWhiteSpace(clss)) {
sb.Append("<li>")
.Append(generateContent(item, counter))
.Append("</li>");
}
else {
sb.Append("<li class=\"")
.Append(clss)
.Append("\">")
.Append(generateContent(item, counter))
.Append("</li>");
}
counter++;
}