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Re: [lwip-users] Dynamic page updation using Ajax-Issue

From: Noam Weissman
Subject: Re: [lwip-users] Dynamic page updation using Ajax-Issue
Date: Thu, 22 Sep 2016 14:49:17 +0000


The WEB server in the contribution is a good starting point.

You can also take a look at the conticki project. They also have a nice WEB 

What I can suggest is building something similar to the SSI handling. SSI is 
implemented by adding a TAG in your HTML code.
For example <!--#edid_set--> ... were the TAG is edid_set

In your SSI (C code) you probably have a table that has pairs of TAG's and call 
back functions. When the WEB server handles a GET
Request it sends back the file to the browser. While sending data it parses the 
HTML and when it finds the tag it call's the related 
call back to insert some dynamic data.

In order to use the same mechanism use the following: 

Create an empty HTML page that only has one TAG in it (not data just the tag) 
... say  ajax_reply ... When the web server gets 
this it does not need to send back any HTML (remember the file is empty, apart 
to the tag !!) ... So the WEB server calls a call back 
function related to this tag.

The call back function is handling ALL the AJAX requests

Portions of what I mean:

const SSI_t SSI_Table[] = 
  // tag,  function call
   {"login", login},
   {"sys_info", sys_info},
   {"net_setup", net_setup},
   {"ajax_reply", AjaxReply},
   {NULL, NULL} // last tag must always be NULL to close the list

The AjaxReply is handling all AJAX call's... in one function

u16_t AjaxReply(HttpParams_t *HttpParams, char *pcInsert, int iInsertLen, u16_t 
current_tag_part, u16_t *next_tag_part)
  char *paramActionValue = NULL;
  char *Password, *User;
  int  RespLen = 0;

  paramActionValue = GetParamValue(HttpParams, "a");  // get action parameter 
from AJAX

  if(strcmp(paramActionValue, HTTPD_LOGIN_TAG_NAME) == 0)
     User = GetParamValue(HttpParams, "user");
     Password = GetParamValue(HttpParams, "pass");

     RespLen = sprint(pcInsert, "true")
  else  if(strcmp(paramActionValue, HTTPD_FREQUENCY) == 0)
   // some code here...

  return RespLen;       

The above is showing a simplified way how to handle an AJAX request from WEB 
browser that sends a user
Name and password and returns true as data.

The internal buffering allocation, data sending etc... is the same/similar to 
how you use to send the device HTML.

Hope that helped. 


-----Original Message-----
From: lwip-users [mailto:address@hidden On Behalf Of ece.kishor
Sent: Thursday, September 22, 2016 6:28 AM
To: address@hidden
Subject: Re: [lwip-users] Dynamic page updation using Ajax-Issue

Firstly thank you for your help and thank you for your approach. Are u have any 
successful example recommendations of ajax GET method inside internet.
Thanking again
Kishor Ravi

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