Cra*_*g M 99 javascript razor asp.net-mvc-3
我尝试这样做的主要动机是获取Javascript,只需要页面底部的部分Javascript和其他Javascript,而不是在部分呈现的页面中间.
这是我正在尝试做的简化示例:
这是在正文之前的Scripts部分的布局.
<!DOCTYPE html>
<html>
<head>
<title>@ViewBag.Title</title>
<link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
</head>
<body>
@RenderBody()
<script src="@Url.Content("~/Scripts/jquery-1.4.4.min.js")" type="text/javascript"></script>
@RenderSection("Scripts", false)
</body>
</html>
这是使用此布局的示例视图.
<h2>This is the view</h2>
@{Html.RenderPartial("_Partial");}
@section Scripts {
<script type="text/javascript">
alert("I'm a view.");
</script>
}
这是从视图中呈现的部分内容.
<p>This is the partial.</p>
@* this never makes it into the rendered page *@
@section Scripts {
<script type="text/javascript">
alert("I'm a partial.");
</script>
}
在此示例中,视图中指定的标记放在节中,但不包含部分标记.是否可以使用Razor从局部视图填充部分？如果没有,还有哪些其他方法可以获取Javascript,只需要页面底部的部分内容,而不是全局包含它？
Mr *_*ell 77
我处理这个问题的方法是在HtmlHelper类中编写几个扩展方法.这允许局部视图说他们需要一个脚本,然后在布局视图中写入我调用我的帮助器方法的标签来发出所需的脚本
以下是帮助方法:
public static string RequireScript(this HtmlHelper html, string path, int priority = 1)
{
var requiredScripts = HttpContext.Current.Items["RequiredScripts"] as List<ResourceInclude>;
if (requiredScripts == null) HttpContext.Current.Items["RequiredScripts"] = requiredScripts = new List<ResourceInclude>();
if (!requiredScripts.Any(i => i.Path == path)) requiredScripts.Add(new ResourceInclude() { Path = path, Priority = priority });
return null;
}
public static HtmlString EmitRequiredScripts(this HtmlHelper html)
{
var requiredScripts = HttpContext.Current.Items["RequiredScripts"] as List<ResourceInclude>;
if (requiredScripts == null) return null;
StringBuilder sb = new StringBuilder();
foreach (var item in requiredScripts.OrderByDescending(i => i.Priority))
{
sb.AppendFormat("<script src=\"{0}\" type=\"text/javascript\"></script>\n", item.Path);
}
return new HtmlString(sb.ToString());
}
public class ResourceInclude
{
public string Path { get; set; }
public int Priority { get; set; }
}
一旦你有了它,部分视图只需要调用@Html.RequireScript("/Path/To/Script").
在布局视图的头部中,您可以调用@Html.EmitRequiredScripts().
另外一个好处是,它允许您清除重复的脚本请求.如果您有多个需要给定脚本的视图/部分视图,您可以放心地假设您只输出一次
Ser*_*eit 12
你可能有第二部分只负责注入必要的javascript.@if如果您愿意,可以在块周围放置几个脚本:
@model string
@if(Model == "bla") {
<script type="text/javascript">...</script>
}
@else if(Model == "bli") {
<script type="text/javascript">...</script>
}
这显然可以清理一下,但是,在Scripts您的视图部分:
@section Scripts
{
@Html.Partial("_Scripts", "ScriptName_For_Partial1")
}
再次,它可能不会赢得美容奖,但它会起作用.
更优雅的方法是将部分视图脚本移动到单独的文件中,然后在视图的脚本部分中呈现它:
<h2>This is the view</h2>
@Html.RenderPartial("_Partial")
@section Scripts
{
@Html.RenderPartial("_PartialScripts")
<script type="text/javascript">
alert("I'm a view script.");
</script>
}
局部视图_ Partial.cshtml:
<p>This is the partial.</p>
部分视图_ PartialScripts.cshtml仅包含脚本:
<script type="text/javascript">
alert("I'm a partial script!");
</script>
安装Forloop.HtmlHelpers nuget包 - 它添加了一些帮助程序来管理部分视图和编辑器模板中的脚本.
在布局的某个地方,您需要打电话
@Html.RenderScripts()
这将是在页面中输出任何脚本文件和脚本块的位置,因此我建议将其放在布局中的主脚本之后以及脚本部分之后(如果有的话).
如果您正在使用捆绑的Web优化框架,则可以使用重载
@Html.RenderScripts(Scripts.Render)
这样该方法用于写出脚本文件.
现在,只要您想在视图,局部视图或模板中添加脚本文件或块,只需使用即可
@using (Html.BeginScriptContext())
{
Html.AddScriptFile("~/Scripts/jquery.validate.js");
Html.AddScriptBlock(
@<script type="text/javascript">
$(function() { $('#someField').datepicker(); });
</script>
);
}
如果多次添加,帮助程序确保只呈现一个脚本文件引用,并且还确保脚本文件以预期顺序呈现,即
[更新版本] 在@Necrocubus 问题之后更新版本以包含内联脚本。
public static class ScriptsExtensions
{
const string REQ_SCRIPT = "RequiredScript";
const string REQ_INLINESCRIPT = "RequiredInlineScript";
const string REQ_STYLE = "RequiredStyle";
#region Scripts
/// <summary>
/// Adds a script
/// </summary>
/// <param name="html"></param>
/// <param name="path"></param>
/// <param name="priority">Ordered by decreasing priority </param>
/// <param name="bottom"></param>
/// <param name="options"></param>
/// <returns></returns>
public static string RequireScript(this IHtmlHelper html, string path, int priority = 1, bool bottom=false, params string[] options)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_SCRIPT] as List<ResourceToInclude>;
if (requiredScripts == null) ctxt.Items[REQ_SCRIPT] = requiredScripts = new List<ResourceToInclude>();
if (!requiredScripts.Any(i => i.Path == path)) requiredScripts.Add(new ResourceToInclude() { Path = path, Priority = priority, Options = options, Type=ResourceType.Script, Bottom=bottom});
return null;
}
/// <summary>
///
/// </summary>
/// <param name="html"></param>
/// <param name="script"></param>
/// <param name="priority">Ordered by decreasing priority </param>
/// <param name="bottom"></param>
/// <returns></returns>
public static string RequireInlineScript(this IHtmlHelper html, string script, int priority = 1, bool bottom = false)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_INLINESCRIPT] as List<InlineResource>;
if (requiredScripts == null) ctxt.Items[REQ_INLINESCRIPT] = requiredScripts = new List<InlineResource>();
requiredScripts.Add(new InlineResource() { Content=script, Priority = priority, Bottom=bottom, Type=ResourceType.Script});
return null;
}
/// <summary>
/// Just call @Html.EmitRequiredScripts(false)
/// at the end of your head tag and
/// @Html.EmitRequiredScripts(true) at the end of the body if some scripts are set to be at the bottom.
/// </summary>
public static HtmlString EmitRequiredScripts(this IHtmlHelper html, bool bottom)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_SCRIPT] as List<ResourceToInclude>;
var requiredInlineScripts = ctxt.Items[REQ_INLINESCRIPT] as List<InlineResource>;
var scripts = new List<Resource>();
scripts.AddRange(requiredScripts ?? new List<ResourceToInclude>());
scripts.AddRange(requiredInlineScripts ?? new List<InlineResource>());
if (scripts.Count==0) return null;
StringBuilder sb = new StringBuilder();
foreach (var item in scripts.Where(s=>s.Bottom==bottom).OrderByDescending(i => i.Priority))
{
sb.Append(item.ToString());
}
return new HtmlString(sb.ToString());
}
#endregion Scripts
#region Styles
/// <summary>
///
/// </summary>
/// <param name="html"></param>
/// <param name="path"></param>
/// <param name="priority">Ordered by decreasing priority </param>
/// <param name="options"></param>
/// <returns></returns>
public static string RequireStyle(this IHtmlHelper html, string path, int priority = 1, params string[] options)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_STYLE] as List<ResourceToInclude>;
if (requiredScripts == null) ctxt.Items[REQ_STYLE] = requiredScripts = new List<ResourceToInclude>();
if (!requiredScripts.Any(i => i.Path == path)) requiredScripts.Add(new ResourceToInclude() { Path = path, Priority = priority, Options = options });
return null;
}
/// <summary>
/// Just call @Html.EmitRequiredStyles()
/// at the end of your head tag
/// </summary>
public static HtmlString EmitRequiredStyles(this IHtmlHelper html)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_STYLE] as List<ResourceToInclude>;
if (requiredScripts == null) return null;
StringBuilder sb = new StringBuilder();
foreach (var item in requiredScripts.OrderByDescending(i => i.Priority))
{
sb.Append(item.ToString());
}
return new HtmlString(sb.ToString());
}
#endregion Styles
#region Models
public class InlineResource : Resource
{
public string Content { get; set; }
public override string ToString()
{
return "<script>"+Content+"</script>";
}
}
public class ResourceToInclude : Resource
{
public string Path { get; set; }
public string[] Options { get; set; }
public override string ToString()
{
switch(Type)
{
case ResourceType.CSS:
if (Options == null || Options.Length == 0)
return String.Format("<link rel=\"stylesheet\" href=\"{0}\" type=\"text/css\" />\n", Path);
else
return String.Format("<link rel=\"stylesheet\" href=\"{0}\" type=\"text/css\" {1} />\n", Path, String.Join(" ", Options));
default:
case ResourceType.Script:
if (Options == null || Options.Length == 0)
return String.Format("<script src=\"{0}\" type=\"text/javascript\"></script>\n", Path);
else
return String.Format("<script src=\"{0}\" type=\"text/javascript\" {1}></script>\n", Path, String.Join(" ", Options));
}
}
}
public class Resource
{
public ResourceType Type { get; set; }
public int Priority { get; set; }
public bool Bottom { get; set; }
}
public enum ResourceType
{
Script,
CSS
}
#endregion Models
}
我的 2 美分，这是一个旧帖子，但仍然相关，所以这里是贝尔先生解决方案的升级更新，该解决方案适用于 ASP.Net Core。
它允许从导入的部分视图和子视图向主布局添加脚本和样式，并可以向脚本/样式导入添加选项（如异步延迟等）：
public static class ScriptsExtensions
{
const string REQ_SCRIPT = "RequiredScript";
const string REQ_STYLE = "RequiredStyle";
public static string RequireScript(this IHtmlHelper html, string path, int priority = 1, params string[] options)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_SCRIPT] as List<ResourceInclude>;
if (requiredScripts == null) ctxt.Items[REQ_SCRIPT] = requiredScripts = new List<ResourceInclude>();
if (!requiredScripts.Any(i => i.Path == path)) requiredScripts.Add(new ResourceInclude() { Path = path, Priority = priority, Options = options });
return null;
}
public static HtmlString EmitRequiredScripts(this IHtmlHelper html)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_SCRIPT] as List<ResourceInclude>;
if (requiredScripts == null) return null;
StringBuilder sb = new StringBuilder();
foreach (var item in requiredScripts.OrderByDescending(i => i.Priority))
{
if (item.Options == null || item.Options.Length == 0)
sb.AppendFormat("<script src=\"{0}\" type=\"text/javascript\"></script>\n", item.Path);
else
sb.AppendFormat("<script src=\"{0}\" type=\"text/javascript\" {1}></script>\n", item.Path, String.Join(" ", item.Options));
}
return new HtmlString(sb.ToString());
}
public static string RequireStyle(this IHtmlHelper html, string path, int priority = 1, params string[] options)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_STYLE] as List<ResourceInclude>;
if (requiredScripts == null) ctxt.Items[REQ_STYLE] = requiredScripts = new List<ResourceInclude>();
if (!requiredScripts.Any(i => i.Path == path)) requiredScripts.Add(new ResourceInclude() { Path = path, Priority = priority, Options = options });
return null;
}
public static HtmlString EmitRequiredStyles(this IHtmlHelper html)
{
var ctxt = html.ViewContext.HttpContext;
var requiredScripts = ctxt.Items[REQ_STYLE] as List<ResourceInclude>;
if (requiredScripts == null) return null;
StringBuilder sb = new StringBuilder();
foreach (var item in requiredScripts.OrderByDescending(i => i.Priority))
{
if (item.Options == null || item.Options.Length == 0)
sb.AppendFormat("<link rel=\"stylesheet\" href=\"{0}\" type=\"text/css\" />\n", item.Path);
else
sb.AppendFormat("<link rel=\"stylesheet\" href=\"{0}\" type=\"text/css\" {1} />\n", item.Path, String.Join(" ", item.Options));
}
return new HtmlString(sb.ToString());
}
public class ResourceInclude
{
public string Path { get; set; }
public int Priority { get; set; }
public string[] Options { get; set; }
}
}