Access WEB form

[christensen]

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

[SymbolicFrank]

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.

[Leledumbo]

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.

[Deepaak]

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.

[Remy Lebeau]

How 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][+][-]

1. var
2.   Http: TIdHTTP;
3.   Input: TStringList;
4. begin
5.   Http := TIdHTTP.Create;
6.   try
7.     Input := TStringList.Create;
8.     try
9.       Input.Add('name=value');
10.       ...
11.       Http.Post('http://server/script', Input);
12.     finally
13.       Form.Free;
14.     end;
15.   finally
16.     Http.Free;
17.   end;
18. end;
19.  

If the <form> "enctype" attribute is set to "multipart/form-data":

Code: Pascal  [Select][+][-]

1. var
2.   Http: TIdHTTP;
3.   Input: TIdMultipartFormDataStream;
4. begin
5.   Http := TIdHTTP.Create;
6.   try
7.     Input := TIdMultipartFormDataStream.Create;
8.     try
9.       Input.AddFormField('name', 'value');
10.       ...
11.       Http.Post('http://server/script', Input);
12.     finally
13.       Form.Free;
14.     end;
15.   finally
16.     Http.Free;
17.   end;
18. end;
19.  

[bee]

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!

[BeniBela]

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.