Access WEB form
lazarus / 38-Networking and Web Programming

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christensen · 2015-11-26 18:14

Hi,

Until this moment i haven't deal with web interfaces, now i want to
access a webpage (link) and field some fields (two fields) and submit.

How can i write in those fields and execut the submit?
What component i sould use.

Any help will be appreciate as i never work with network components.

Thanks

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SymbolicFrank · 2015-12-04 23:15

Probably Synapse, and especially one called synalist that includes
ssl_openssl.pas.

But if you want more advice, I would want more details.

Like: your platform (Windows x, Linux y, Apple z), what exactly you
want to do with that website, and if you are also the person managing
that website.

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Leledumbo · 2015-12-06 17:41

You don't really need a component, you need to read and understand how
http protocol works. Once you get it, any networking library with http
support (including but not limited to the pre-installed fcl-web units)
will do.

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Deepaak · 2015-12-06 17:49

If it is your website then it is really very easy to execute this
task. Its upto your preference that which library you will like to
choose, whether fcl-web, inet, indy or synapse.

Add required controls on your form and. Use any of these library to
send the forms data to your webpage using the get/post methods. And
when you receive that data on your webpage, do what-ever you like, its
that simple.

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Remy Lebeau · 2015-12-09 22:37

Quote from: christensen on November 26, 2015, 07:14:47 pmHow can i
write in those fields and execut the submit?
What component i sould use.

If you use Indy, its TIdHTTP component can be used to submit an HTML
webform (a <form> element and <input> fields) to an HTTP server.

If the <form> "enctype" attribute is omitted, or set to
"application/x-www-form-urlencoded":

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i var  Http:
TIdHTTP;  Input: TStringList;begin  Http := TIdHTTP.Create;  try   
Input := TStringList.Create;    try      Input.Add('name=value');    
...      Http.Post('http://server/script', Input);    finally     
Form.Free;    end;  finally    Http.Free;  end;end; 
If the <form> "enctype" attribute is set to "multipart/form-data":

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i var  Http:
TIdHTTP;  Input: TIdMultipartFormDataStream;begin  Http :=
TIdHTTP.Create;  try    Input := TIdMultipartFormDataStream.Create;  
try      Input.AddFormField('name', 'value');      ...     
Http.Post('http://server/script', Input);    finally      Form.Free; 
 end;  finally    Http.Free;  end;end;

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bee · 2015-12-10 03:32

For simple tasks, using a library is overkill. Web app is very simple,
some readln and writeln are enough. I have some examples here:
http://beeography.koding.io/viewcode.cgi. No external libraries
required, just basic Pascal and some RTL. You could take a look at the
source code and you could also run the app. Good luck!

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BeniBela · 2015-12-10 12:48

Or full overkill with my Internet Tools:
Code: [Select]query('form((doc("http://server/link")//form)[1],
{"name": $_1})', ['value']).retrieve();
and you do not need to care about the enctype, since it checks for
that.