/// <summary>
/// Helper method for building paging links.
/// </summary>
/// <param name="htmlHelper">The HTML helper.</param>
/// <param name="pagingInfo">The paging info.</param>
/// <param name="pageUrl">The page URL.</param>
/// <returns></returns>
public static MvcHtmlString PageLinks( this HtmlHelper htmlHelper, PagingInfo pagingInfo, Func<int, string> pageUrl )
{
StringBuilder stringBuilder = new StringBuilder();
for( int i = 1; i <= pagingInfo.TotalPages; i++ )
{
// Build a page index's link
TagBuilder anchorTagBuilder = new TagBuilder( "a" );
anchorTagBuilder.MergeAttribute( "href", pageUrl( i ) );
anchorTagBuilder.InnerHtml = string.Format( "{0}", i.ToString(CultureInfo.InvariantCulture) );
// Define current page index's style
if( i == pagingInfo.CurrentPageIndex )
{
anchorTagBuilder.AddCssClass( "selected" );
}
stringBuilder.Append( anchorTagBuilder );
}
return MvcHtmlString.Create( stringBuilder.ToString() );
}
public void Can_Generate_Page_Links()
{
// Arrange - Define HtmlHelper, at the moment we'd just instantiate it from current default type which takes null params on its contructor args
HtmlHelper htmlHelper = null;
// Arrange - Expected result
StringBuilder expectedBuilder = new StringBuilder();
expectedBuilder.Append(string.Format("<a class=\"{0}\" href=\"{1}\">{2}</a>", "selected", buildPageUrl(1), 1));
expectedBuilder.Append(string.Format("<a href=\"{0}\">{1}</a>", buildPageUrl(2), 2));
// Arrange - Create paging info
PagingInfo pagingInfo = new PagingInfo { CurrentPageIndex = 1, ItemsPerPage = 2, TotalItems = 4 };
// Arrange - Setup the pageUrl delegate
Func<int, string> pageUrlDelegate = buildPageUrl;
// Act:
MvcHtmlString result = htmlHelper.PageLinks(pagingInfo, pageUrlDelegate);
// Assert:
String expected = expectedBuilder.ToString();
String actual = result.ToString();
Assert.AreEqual(expected, actual);
}
