/// <summary>
/// Generate index and add it to input elements.
/// </summary>
/// <param name="helper">HtmlHelper.</param>
/// <param name="collectionName">Name of collection, must be same at posted action method.</param>
/// <param name="generateHiddenIndexer">Generate hidden indexer input and write it to html if set to true.</param>
/// <returns>IDisposable.</returns>
internal static IDisposable BeginCollectionItem <TModel>(
this HtmlHelper <TModel> helper,
string collectionName,
bool generateHiddenIndexer)
{
Queue <string> currentIds = GetCurrentIds(
helper.ViewContext.HttpContext, collectionName);
// If any id exist in the http context use it,
// otherwise create new id.
string itemIndex = currentIds.Count > 0
? currentIds.Dequeue()
: Guid.NewGuid().ToString();
// Generate and write hidden indexer to view if needed
if (generateHiddenIndexer)
{
MvcHtmlString hiddenIndexer = helper.HiddenIndexerForModel(
collectionName,
itemIndex,
null);
TextWriter writer = helper.ViewContext.Writer;
writer.WriteLine(hiddenIndexer.ToHtmlString());
}
// Construct html prefix
string htmlFieldPrefix = string.Format("{0}[{1}]", collectionName, itemIndex);
// Begin field prefix scope
return(helper.BeginHtmlFieldPrefixScope(htmlFieldPrefix));
}
public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName)
{
Queue <string> idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName);
string str = (idsToReuse.Count > 0) ? idsToReuse.Dequeue() : Guid.NewGuid().ToString();
html.ViewContext.Writer.WriteLine(string.Format("<input type=\"hidden\" name=\"{0}.index\" autocomplete=\"off\" value=\"{1}\" />", collectionName, html.Encode(str)));
return(html.BeginHtmlFieldPrefixScope(string.Format("{0}[{1}]", collectionName, str)));
}
public void Returns_IDisposable()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
result.ShouldImplement <IDisposable>();
}
}
public void Returns_IDisposable()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
Assert.That(result,
Is.Not.Null
.And.InstanceOf <IDisposable>());
}
}
public void Wraps_HtmlHelper_ViewData_TemplateInfo()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
Assert.That(result, Is.Not.Null);
Assert.That(result.TemplateInfo,
Is.Not.Null
.And.EqualTo(html.ViewData.TemplateInfo));
}
}
public void Wraps_HtmlHelper_ViewData_TemplateInfo()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
// ReSharper disable PossibleNullReferenceException
result.TemplateInfo.ShouldNotBeNull();
// ReSharper restore PossibleNullReferenceException
result.TemplateInfo.ShouldEqual(html.ViewData.TemplateInfo);
}
}
public void Restores_HtmlHelper_ViewData_TemplateInfo_HtmlFieldPrefix_WhenDisposed()
{
const string nextFieldPrefix = "InnerItems";
const string prevFieldPrefix = "OuterItems";
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
html.ViewData.TemplateInfo.HtmlFieldPrefix = prevFieldPrefix;
using (var result = html.BeginHtmlFieldPrefixScope(nextFieldPrefix)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
}
html.ViewData.TemplateInfo.HtmlFieldPrefix.ShouldEqual(prevFieldPrefix);
}
public void Restores_HtmlHelper_ViewData_TemplateInfo_HtmlFieldPrefix_WhenDisposed()
{
const string nextFieldPrefix = "InnerItems";
const string prevFieldPrefix = "OuterItems";
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
html.ViewData.TemplateInfo.HtmlFieldPrefix = prevFieldPrefix;
using (var result = html.BeginHtmlFieldPrefixScope(nextFieldPrefix)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
Assert.That(result, Is.Not.Null);
}
Assert.That(html.ViewData.TemplateInfo.HtmlFieldPrefix, Is.EqualTo(prevFieldPrefix));
}
public void Changes_HtmlHelper_ViewData_TemplateInfo_HtmlFieldPrefix_WhenUsed()
{
const string nextFieldPrefix = "InnerItems";
const string prevFieldPrefix = "OuterItems";
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
html.ViewData.TemplateInfo.HtmlFieldPrefix = prevFieldPrefix;
using (var result = html.BeginHtmlFieldPrefixScope(nextFieldPrefix)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
// ReSharper disable PossibleNullReferenceException
result.PreviousHtmlFieldPrefix.ShouldNotBeNull();
// ReSharper restore PossibleNullReferenceException
result.PreviousHtmlFieldPrefix.ShouldEqual(prevFieldPrefix);
html.ViewData.TemplateInfo.HtmlFieldPrefix.ShouldEqual(nextFieldPrefix);
}
}
public void Wraps_HtmlHelper_ViewData_TemplateInfo()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
Assert.That(result, Is.Not.Null);
Assert.That(result.TemplateInfo,
Is.Not.Null
.And.EqualTo(html.ViewData.TemplateInfo));
}
}
public void Returns_IDisposable()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
Assert.That(result,
Is.Not.Null
.And.InstanceOf<IDisposable>());
}
}
public void Restores_HtmlHelper_ViewData_TemplateInfo_HtmlFieldPrefix_WhenDisposed()
{
const string nextFieldPrefix = "InnerItems";
const string prevFieldPrefix = "OuterItems";
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
html.ViewData.TemplateInfo.HtmlFieldPrefix = prevFieldPrefix;
using (var result = html.BeginHtmlFieldPrefixScope(nextFieldPrefix)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
Assert.That(result, Is.Not.Null);
}
Assert.That(html.ViewData.TemplateInfo.HtmlFieldPrefix, Is.EqualTo(prevFieldPrefix));
}
public void Wraps_HtmlHelper_ViewData_TemplateInfo()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
// ReSharper disable PossibleNullReferenceException
result.TemplateInfo.ShouldNotBeNull();
// ReSharper restore PossibleNullReferenceException
result.TemplateInfo.ShouldEqual(html.ViewData.TemplateInfo);
}
}
public void Returns_IDisposable()
{
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
using (var result = html.BeginHtmlFieldPrefixScope(string.Empty)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
result.ShouldImplement<IDisposable>();
}
}
public void Restores_HtmlHelper_ViewData_TemplateInfo_HtmlFieldPrefix_WhenDisposed()
{
const string nextFieldPrefix = "InnerItems";
const string prevFieldPrefix = "OuterItems";
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
html.ViewData.TemplateInfo.HtmlFieldPrefix = prevFieldPrefix;
using (var result = html.BeginHtmlFieldPrefixScope(nextFieldPrefix)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
}
html.ViewData.TemplateInfo.HtmlFieldPrefix.ShouldEqual(prevFieldPrefix);
}
public void Changes_HtmlHelper_ViewData_TemplateInfo_HtmlFieldPrefix_WhenUsed()
{
const string nextFieldPrefix = "InnerItems";
const string prevFieldPrefix = "OuterItems";
var viewContext = new ViewContext();
var html = new HtmlHelper(viewContext, new FakeViewDataContainer());
html.ViewData.TemplateInfo.HtmlFieldPrefix = prevFieldPrefix;
using (var result = html.BeginHtmlFieldPrefixScope(nextFieldPrefix)
as HtmlPrefixScopeExtensions.HtmlFieldPrefixScope)
{
result.ShouldNotBeNull();
// ReSharper disable PossibleNullReferenceException
result.PreviousHtmlFieldPrefix.ShouldNotBeNull();
// ReSharper restore PossibleNullReferenceException
result.PreviousHtmlFieldPrefix.ShouldEqual(prevFieldPrefix);
html.ViewData.TemplateInfo.HtmlFieldPrefix.ShouldEqual(nextFieldPrefix);
}
}