Il 13/11/2017 14:34, Noam Weissman ha scritto:
Hi,
I am using the following technic for AJAX.
Create an empty file named ajax.shtml or ajax.html and add it to your file list.
Inside the file you only write one tag without anything else. For example
<!--#AjaxCall-->
Do not add CR or LF just the tag !!.
Now when you issue an AJAX call the WEB server opens the file, reads it and
send its data.
Because the file has only the tag it will parse it, call your handler for that
tag and send back
To the browser just your data !!
Ok, so you use SSI to create dynamic data. I tried with custom files,
because *all the content* is dynamic (and not only some parts, defined
by specific tags).
If you use Juery it will look something like this... actually a function used
as an event handler in
my own code:
function resetIO()
{
//Remove the dialog
returnToPage();
$.ajax({
url: "ajax.shtml",
dataType : "text",
type : "GET",
cache : false,
data : ({
ssid: ssid,
a: 'opReset',
type: 2
}),
error : function()
{
showMessage("Network Error: Sorry, there was a problem connecting to
the server.");
},
success : function(result)
{
window.location.href = document.location;
}
});
}
In the above data you have the a: variable, this is your AJAX action !.
If I understood well, data is translated in query string, in your example:
GET ajax.shtml?ssid=<ssid>&a=opReset&type=2
Of course, <ssid> is the value of ssid Javascript variable.
In your own SSI/CGI code you have a table with tags + callbacks... one of the
callback function
Is your AJAX handler. Inside it you create an if <> else layout and handle the
different actions.
The prototype for SSI callbacks is:
typedef u16_t (*tSSIHandler)(
#if LWIP_HTTPD_SSI_RAW
const char* ssi_tag_name,
#else /* LWIP_HTTPD_SSI_RAW */
int iIndex,
#endif /* LWIP_HTTPD_SSI_RAW */
char *pcInsert, int iInsertLen
#if LWIP_HTTPD_SSI_MULTIPART
, u16_t current_tag_part, u16_t
*next_tag_part
#endif /* LWIP_HTTPD_SSI_MULTIPART */
#if defined(LWIP_HTTPD_FILE_STATE) && LWIP_HTTPD_FILE_STATE
, void *connection_state
#endif /* LWIP_HTTPD_FILE_STATE */
);
I don't see any reference to query string parameters. So how to select
the right action?
The HTTP server will read your ajax.shtml file and because it has nothing BUT
your tag it will
only send back the dynamic data you process in your ajax handling function.
As said before, it works if the dynamic content depends only from the
name of the file (ajax.shtml in your example) and not from the action in
the query string (a=opReset).
Where is my error?
Another question. I saw ssid in your javascript example. Is it related
to a "session identifier"? If so, did you implement a session mechanism
over httpd?
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