.net 动态加载css与js

我在项目的根目下建了一个名为和JScript.js和StyleSheet.css文件。前端页面放了一个Div和input。div用于使用样式，input用于测试js.

JScript.js的内容为：

function  funMessageShow() {
    alert( " 测试加载Js " );
}

StyleSheet.css的内容为：

.testCss
{
    background-color : Gray ;
}

前端页面的html源码为：

     < form  id ="form1"  runat ="server" >
     < div  class ="testCss" >
        测试加载Css
     </ div >
     < input  id ="btnShow"  type ="button"  value ="测试加载js"  onclick ="return funMessageShow();"   />
     </ form >

 

现在要从后台动态加载它们。

加载Css的主要代码为：

代码

     ///   <summary>
     ///  正常加载CSS
     ///   </summary>
     ///   <param name="pPage"> 要加载的页面 </param>
     ///   <param name="sStyleLink"> 样式url </param>
     public   void  LinkStyle(Page pPage,  string  sStyleLink)
    {
        System.Web.UI.HtmlControls.HtmlLink hlLink  =   new  System.Web.UI.HtmlControls.HtmlLink(); 
        hlLink.Attributes.Add( " rel " ,  " stylesheet " );
        hlLink.Attributes.Add( " type " ,  " text/css " );
        hlLink.Attributes.Add( " href " , sStyleLink);
        Page.Header.Controls.Add(hlLink);
               
    }

加载Js的代码为 ：

代码

     ///   <summary>
     ///  正常加载Js
     ///   </summary>
     ///   <param name="pPage"> 要加载的页面 </param>
     ///   <param name="sJsUrl"> js的url </param>
     public   void  LinkJs(Page pPage,  string  sJsUrl)
    {
        System.Web.UI.HtmlControls.HtmlGenericControl hgcLoadJs  =   new  System.Web.UI.HtmlControls.HtmlGenericControl();
        hgcLoadJs.TagName  =   " script " ;
        hgcLoadJs.Attributes.Add( " type " ,  " text/javascript " );
        hgcLoadJs.Attributes.Add( " src " , Page.ResolveClientUrl(sJsUrl));  // ResolveClientUrl:获取浏览器可以使用的 URL
        Page.Header.Controls.Add(hgcLoadJs);

    }

 

后台完整的代码如下，包含对是否已加载的判断代码。

代码

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Web;
using  System.Web.UI;
using  System.Web.UI.WebControls;

public   partial   class  _Default : System.Web.UI.Page
{
     protected   void  Page_Load( object  sender, EventArgs e)
    {
         if  ( ! IsPostBack)
        {
             string  sThisJsUrl  =   " JScript.js " ;
             string  sThisStyleUrl  =   " StyleSheet.css " ;          
            LinkStyle( this .Page, sThisStyleUrl);
            LinkJs( this .Page, sThisJsUrl);
             // ReferenceAjaxScript(this.Page, sThisJs);
             // ReferenceJs(this.Page, sThisJs, sThisJs);
            judgeCssExist(sThisStyleUrl);
            judgeJsExist(sThisJsUrl);
        }
    }

    

     #region  加载Css
     ///   <summary>
     ///  正常加载CSS
     ///   </summary>
     ///   <param name="pPage"> 要加载的页面 </param>
     ///   <param name="sStyleLink"> 样式url </param>
     public   void  LinkStyle(Page pPage,  string  sStyleLink)
    {
        System.Web.UI.HtmlControls.HtmlLink hlLink  =   new  System.Web.UI.HtmlControls.HtmlLink(); 
        hlLink.Attributes.Add( " rel " ,  " stylesheet " );
        hlLink.Attributes.Add( " type " ,  " text/css " );
        hlLink.Attributes.Add( " href " , sStyleLink);
        Page.Header.Controls.Add(hlLink);
               
    }
     // 加css不同法，功能与上边方法相同
     public   void  LinkStyle2(Page pPage,  string  sStyleLink)
    {
        System.Web.UI.HtmlControls.HtmlGenericControl objLink  =   new  System.Web.UI.HtmlControls.HtmlGenericControl();
        objLink.TagName  =   " link " ;
        objLink.Attributes[ " rel " ]  =   " stylesheet " ;
        objLink.Attributes[ " type " ]  =   " text/css " ;
        objLink.Attributes[ " href " ]  =  sStyleLink;
        Page.Header.Controls.Add(objLink);
    }
     #endregion

     #region   加载Js
     ///   <summary>
     ///  正常加载Js
     ///   </summary>
     ///   <param name="pPage"> 要加载的页面 </param>
     ///   <param name="sJsUrl"> js的url </param>
     public   void  LinkJs(Page pPage,  string  sJsUrl)
    {
        System.Web.UI.HtmlControls.HtmlGenericControl hgcLoadJs  =   new  System.Web.UI.HtmlControls.HtmlGenericControl();
        hgcLoadJs.TagName  =   " script " ;
        hgcLoadJs.Attributes.Add( " type " ,  " text/javascript " );
        hgcLoadJs.Attributes.Add( " src " , Page.ResolveClientUrl(sJsUrl));  // ResolveClientUrl:获取浏览器可以使用的 URL
        Page.Header.Controls.Add(hgcLoadJs);

    }
     ///   <summary>
     ///  加载js
     ///   </summary>
     ///   <param name="pPage"> 要加载的页面 </param>
     ///   <param name="sJsName"> js名称 </param>
     ///   <param name="sJsUrl"> js的Url </param>
     public   void  ReferenceJs(Page pPage, string  sJsName, string  sJsUrl)
    {
        Type tPage  =  Page.GetType();
        ClientScriptManager csmManager  =  Page.ClientScript;
         if  ( ! csmManager.IsClientScriptIncludeRegistered(tPage, sJsName))
        {
            csmManager.RegisterClientScriptInclude(tPage, sJsName, Page.ResolveClientUrl(sJsUrl));
        }
    }
     #endregion


     ///   <summary>
     ///  在Ajax方式下加载Js
     ///   </summary>
     ///   <param name="pPage"> 要加载的页面 </param>
     ///   <param name="sJsUrl"> js的url </param>
     public   void  ReferenceAjaxScript(Page pPage,  string  sJsUrl)
    {
        ScriptReference srReference  =   new  ScriptReference(sJsUrl);
        ScriptManager smManager  =  ScriptManager.GetCurrent(pPage);
         if  (smManager  !=   null )
        {
            smManager.Scripts.Add(srReference);
        }
    }

     ///   <summary>
     ///  判断Css是否已加载
     ///   </summary>
     ///   <param name="sCssUrl"> css url </param>
     private   void  judgeCssExist( string  sCssUrl)
    {
        ControlCollection ccCollection  =  Page.Header.Controls;
         if  (ccCollection.Count  >   0 )
        {
             foreach  (Control cItem  in  ccCollection)
            {
                 if  (cItem.GetType()  ==   typeof (System.Web.UI.HtmlControls.HtmlLink))
                {
                    System.Web.UI.HtmlControls.HtmlLink hlLink  =  cItem  as  System.Web.UI.HtmlControls.HtmlLink;
                     if  (hlLink.Attributes[ " href " ].ToString()  ==  sCssUrl)
                    {
                        Response.Write( " 此CSS已存在，无须加载!<br/> " );
                    }
                }
            }
        }
    }
     ///   <summary>
     ///  判断js是否已加载
     ///   </summary>
     ///   <param name="sJsUrl"> js url </param>
     private   void  judgeJsExist( string  sJsUrl)
    {
        ControlCollection ccCollection  =  Page.Header.Controls;
         if  (ccCollection.Count  >   0 )
        {
             foreach  (Control cItem  in  ccCollection)
            {
                 if  (cItem.GetType()  ==   typeof (System.Web.UI.HtmlControls.HtmlGenericControl))
                {
                    System.Web.UI.HtmlControls.HtmlGenericControl hgcControl  =  cItem  as  System.Web.UI.HtmlControls.HtmlGenericControl;
                     if  (hgcControl.Attributes[ " src " ].ToString()  ==  sJsUrl)
                    {
                        Response.Write( " 此Js已存在，无须加载!<br/> " );
                    }
                }
            }
        }
    }

}