如何为htmlhelper 扩展 checkboxlist checkboxlistfor
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发布时间:2022-04-26 19:06
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时间:2023-10-22 18:14
public static class CheckBoxListHelper
{
public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string name, bool isHorizon = true)
{
return CheckBoxList(helper, name, helper.ViewData[name] as IEnumerable<SelectListItem>, new { }, isHorizon);
}
public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string name, IEnumerable<SelectListItem> selectList, bool isHorizon = true)
{
return CheckBoxList(helper, name, selectList, new { }, isHorizon);
}
public static MvcHtmlString CheckBoxListFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList, bool isHorizon = true)
{
string[] propertys = expression.ToString().Split(".".ToCharArray());
string id = string.Join("_", propertys, 1, propertys.Length - 1);
string name = string.Join(".", propertys, 1, propertys.Length - 1);
return CheckBoxList(helper, id, name, selectList, new { }, isHorizon);
}
public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string name, IEnumerable<SelectListItem> selectList, object htmlAttributes, bool isHorizon = true)
{
return CheckBoxList(helper, name, name, selectList, htmlAttributes, isHorizon);
}
public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string id, string name, IEnumerable<SelectListItem> selectList, object htmlAttributes, bool isHorizon = true)
{
IDictionary<string, object> HtmlAttributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
HashSet<string> set = new HashSet<string>();
List<SelectListItem> list = new List<SelectListItem>();
string selectedValues = (selectList as SelectList).SelectedValue == null ? string.Empty : Convert.ToString((selectList as SelectList).SelectedValue);
if (!string.IsNullOrEmpty(selectedValues))
{
if (selectedValues.Contains(","))
{
string[] tempStr = selectedValues.Split(',');
for (int i = 0; i < tempStr.Length; i++)
{
set.Add(tempStr[i].Trim());
}
}
else
{
set.Add(selectedValues);
}
}
foreach (SelectListItem item in selectList)
{
item.Selected = (item.Value != null) ? set.Contains(item.Value) : set.Contains(item.Text);
list.Add(item);
}
selectList = list;
HtmlAttributes.Add("type", "checkbox");
HtmlAttributes.Add("id", id);
HtmlAttributes.Add("name", name);
HtmlAttributes.Add("style", "border:none;");
StringBuilder stringBuilder = new StringBuilder();
foreach (SelectListItem selectItem in selectList)
{
IDictionary<string, object> newHtmlAttributes = HtmlAttributes.IDictionaryCopy();
newHtmlAttributes.Add("value", selectItem.Value);
if (selectItem.Selected)
{
newHtmlAttributes.Add("checked", "checked");
}
TagBuilder tagBuilder = new TagBuilder("input");
tagBuilder.MergeAttributes<string, object>(newHtmlAttributes);
string inputAllHtml = tagBuilder.ToString(TagRenderMode.SelfClosing);
string containerFormat = isHorizon ? @"<label> {0} {1}</label>" : @"<p><label> {0} {1}</label></p>";
stringBuilder.AppendFormat(containerFormat,
inputAllHtml, selectItem.Text);
}
return MvcHtmlString.Create(stringBuilder.ToString());
}
private static IDictionary<string, object> IDictionaryCopy(this IDictionary<string, object> ht)
{
Dictionary<string, object> _ht = new Dictionary<string, object>();
foreach (var p in ht)
{
_ht.Add(p.Key, p.Value);
}
return _ht;
}
}