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Using response. Flush and IFRAME to implement "server push" Technology (continued)

Source: Internet
Author: User
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In the previous article, I used IFRAME to implement "server push". This method has the disadvantage that IE and Firefox will see the progress bar loading status. In the previous article, I also introduced the solution to IE, we recommend that you first read the previous article. The progress bar is always loaded in Firefox.

ClientCode:

 
1:<DivID= "Content"Style="Width: 400px;Height: 200px;Border: 1px solid # ff0 "> </Div>
 
2:<ScriptType= "Text/JavaScript">
 
 
3:VaRComet = {
 
 
4:Connection:False,
 
 
5:Iframediv:False,
 
 
6: 
 
 
7:Initialize:Function(){
 
 
8:If(Navigator. appversion. indexof ("MSIE")! =-1 ){
 
9: 
 
 
10:// For IE browsers
 
 
11:Comet. Connection =NewActivexobject ("Htmlfile");
 
 
12:Comet. Connection. open ();
 
 
13:Comet. Connection. Write ("<HTML>");
 
 
14:Comet. Connection. Write ("<SCRIPT> document. Domain = '"+ Document. Domain +"'");
 
15:Comet. Connection. Write ("</Html>");
 
 
16:Comet. Connection. Close ();
 
 
17:Comet. iframediv = Comet. Connection. createelement ("Div");
 
 
18:Comet. Connection. appendchild (comet. iframediv );
 
 
19:Comet. Connection. parentwindow. Comet = comet;
 
 
20:Comet. iframediv. innerhtml ="<IFRAME id = 'comet _ IFRAME 'src = 'flush. aspx '> </iframe>";
 
 
21: 
 
22:}Else if(Navigator. appversion. indexof ("Khtml")! =-1 ){
 
 
23: 
 
 
24:// For khtml browsers
 
 
25:Comet. Connection = Document. createelement ('Iframe');
 
 
26:Comet. Connection. setattribute ('Id','Comet _ iframe');
 
27:Comet. Connection. setattribute ('Src','Flush. aspx');
 
 
28:With(Comet. Connection. Style ){
 
 
29:Position ="Absolute";
 
 
30:Left = Top ="-100px";
 
 
31:Height = width ="1px";
 
 
32:Visibility ="Hidden";
 
 
33:}
 
34:Document. Body. appendchild (comet. connection );
 
 
35: 
 
 
36:}Else{
 
 
37:// For other browser (Firefox ...)
 
 
38:Comet. Connection = Document. createelement ('Iframe');
 
 
39:Comet. Connection. setattribute ('Id','Comet _ iframe');
 
 
40:With(Comet. Connection. Style ){
 
41:Left = Top ="-200px";
 
 
42:Height = width ="1px";
 
 
43:Visibility ="Hidden";
 
 
44:Display ='None';
 
 
45:}
 
 
46:Comet. iframediv = Document. createelement ('Iframe');
 
47:Comet. iframediv. setattribute ('Src','Flush. aspx');
 
 
48:Comet. Connection. appendchild (comet. iframediv );
 
 
49:Document. Body. appendchild (comet. connection );
 
 
50: 
 
 
51:}
 
 
52:},
 
 
53: 
 
 
54:// This function will be called from backend. php
 
55:Getdata:Function(D ){
 
 
56:$ ('# Content'). Append (d );
 
 
57:},
 
 
58: 
 
 
59:OnUnload:Function(){
 
 
60:If(Comet. Connection ){
 
 
61:Comet. Connection =False;
 
62:// Release the IFRAME to prevent problems with IE when reloading the page
 
 
63:}
 
 
64:}
 
 
65:}
 
 
66: 
 
 
67:Comet. initialize ();
 
 
68: 
 
 
69:</Script>
 
 
70:

Server code:

1:Protected voidPage_load (ObjectSender,EventargsE)
 
 
2:{
 
 
3:StringStarthtml ="<! Doctype HTML public \ "-// W3C // dtd xhtml 1.0 transitional // en \" \ "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd\">"+Environment. Newline
 
 
4:+"<HTML xmlns = \" http://www.w3.org/5o/xhtml\ ">"+Environment. Newline
 
5:+"<Head>"+Environment. Newline
 
 
6:+"</Head>"+Environment. Newline
 
 
7:+"<Body>"+Environment. Newline;
 
 
8: 
 
 
9:Starthtml + =NewString('', 1024) +Environment. Newline;
 
 
10: 
 
11:Response. Write (starthtml );
 
 
12:Response. Flush ();
 
 
13: 
 
 
14:StringData ="<SCRIPT type = \" text/JavaScript \ "> window. Parent. Comet. getdata (\" {0} \ "); </SCRIPT>";
 
 
17:Response. Write (String. Format (data,"Start to send data: <br/>"));
 
 
18:Response. Flush ();
 
 
19: 
 
 
20:IntIndex = 0;
 
21:While(True)
 
 
22:{
 
 
23:System. threading.Thread. Sleep (2000 );
 
 
24:If(Index % 2 = 0)
 
 
25:{
 
 
26:Response. Write (String. Format (data,Datetime. Now. tostring ("Yyyy-mm-dd hh: mm: SS") +"Data sent by the server <br/>"));
 
 
27:}
 
28:Else
 
 
29:{
 
 
30:Response. Write (String. Format (data,Datetime. Now. tostring ("Yyyy-mm-dd hh: mm: SS") +"No data transmission <br/>"));
 
 
31:}
 
 
32:Response. Flush ();
 
 
33: 
 
 
34:Index ++;
 
 
35:}
 
 
36:}
 
  37:

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