Asp.Net - 检测页面上没有JavaScript的？ （改名为标题） [英] Asp.Net - Detect no javascript on page? (renamed title)
问题描述
我有一个显示其在TabContainer的所有内容的页面，但如果JavaScript在浏览器中禁用它只是显示一个空白页。
I have a page that displays all its content in a TabContainer, but if javascript is disabled on the browser it just displays a blank page.
我可以添加＆LT; NOSCRIPT方式＆gt; 来显示所有的重要内容，但空白TabContainer的仍呈现
I can add a <noscript> to display all the important content, but the blank TabContainer still renders.
我想在标题中增加一个重定向到同一页面加？无脚本=真实的，但它不应该是无限的。我想用一个占位符的控制，将出台相应的＆LT; META HTTP-EQUIV =刷新CONTENT =0; URL =网址无脚本=真正的＆GT; 时当前URL没有无脚本查询值。
I'd like to add a in the header to redirect to the same page plus ?noscript=true, but it shouldn't be infinite. I figure using a PlaceHolder control that will put the appropriate <META HTTP-EQUIV="Refresh" CONTENT="0; URL=url?noscript=true"> when the current url doesn't have the noscript query value.
然后，我可以将Visible属性设置为false时无脚本查询值是present的TabContainer的。
Then I can set the Visible property to false for the TabContainer when the noscript query value is present.
这是去了解它的正确方法？
Is this the right way to go about it?
推荐答案
好了，因为我是彻底的，不希望重复code，我创造了这个组件，做我的其他答案加检查会议，并视图状态为previous检测。
Well, because I'm thorough, and don't want to duplicate code, I created this component that does my other answer plus checks session and viewstate for previous detection.
组件的价值在于，它可以在其他网页被使用，并且将可被上与成分的其他网页所使用的相同的会话/ cookie值
The value of the component is that it can be used on other pages and it will have access to the same session/cookie value that was used on other pages with the component.
在改进建议？
using System;
using System.ComponentModel;
using System.Linq;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace AspNetLib.Controls
{
/*
* This component should be placed in the <head> html tag and not in the body or form.
*/
[DefaultProperty("Noscript")]
[ToolboxData("<{0}:NoJavascript runat=server />")]
public class NoJavascript : WebControl
{
HttpRequest Request = HttpContext.Current.Request;
HttpSessionState Session = HttpContext.Current.Session;
HttpResponse Response = HttpContext.Current.Response;
[Bindable(true)]
[Category("Appearance")]
[DefaultValue(false)]
[Localizable(true)]
public bool Noscript
{
get
{
bool noscript;
// check if we've detected no script before
try
{
noscript = Convert.ToBoolean(Session["js:noscript"] ?? false);
if (noscript) return true;
}
catch { } // if session disabled, catch its error
HttpCookie Cookie = Request.Cookies["JavascriptDetectionComponent"];
if (null != Cookie)
{
noscript = !string.IsNullOrEmpty(Cookie["js:noscript"]);
if (noscript) return true;
}
noscript = Convert.ToBoolean(ViewState["js:noscript"] ?? false);
if (noscript) return true;
// if we've returned from meta evaluate noscript query setting
noscript = !string.IsNullOrEmpty(Request["noscript"]);
if (noscript)
{
SetNoScript();
return true;
}
return false;
}
}
[Bindable(true)]
[Category("Misc")]
[DefaultValue("")]
[Localizable(true)]
public string CookieDomain
{
get { return Convert.ToString(ViewState["CookieDomain"] ?? string.Empty); }
set { ViewState["CookieDomain"] = value; }
}
private void SetNoScript()
{
try { Session["js:noscript"] = true; }
catch { }// if session disabled, catch its error
ViewState["js:noscript"] = true;
HttpCookie Cookie = new HttpCookie("JavascriptDetectionComponent");
if (!string.IsNullOrEmpty(CookieDomain))
Cookie.Domain = CookieDomain;
Cookie["js:noscript"] = "true";
Response.Cookies.Add(Cookie);
}
protected override void RenderContents(HtmlTextWriter output)
{
if (!Noscript)
{
string url = Request.Url.ToString();
string adv = "?";
if (url.Contains('?'))
adv = "&";
string meta = string.Format("<META HTTP-EQUIV=\"Refresh\" CONTENT=\"0; URL={0}{1}noscript=true\">",
url, adv);
output.WriteLine("<noscript>");
output.WriteLine(" " + meta);
output.WriteLine("</noscript>");
}
}
}
}
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