Pre-populated Form Fields

Pre-populated Form Fields


	The htmlServer base class provides features that allow empty form fields to be pre-populated with values from the server's name/value list. The following example illustrates the technique:

	#include <stdio.h>
	#include <stdlib.h>
	#include <dcmicro/htmlpp/htmlpp.h>

	int main( void )
	{
	htmlCgi server( cin ) ;
	htmlPage page ;

	htmlForm form( "/cgi-bin/prepop" );

	// Set up input areas for last name, first name,
	// and email address. Allow up to 20 characters
	// for the names, and 30 characters for the email.
	// Note that we're specifically assigning the
	// 'email' field to a non-empty value.
	form << "Last Name: "
	<< htmlInputText( "lname", 20 )
	<< htmlBreak() ;

	form << "First Name: "
	<< htmlInputText( "fname", 20 )
	<< htmlBreak() ;

	form << "Email address: "
	<< htmlInputText( "email", "XXX", 30 )
	<< htmlBreak() ;

	// Add a submit button with a custom label
	form << htmlCenter( htmlInputSubmit("Press to continue") );
	page << form ;

	// Create data elements with names matching the form
	// fields of interest. These values will replace empty
	// values with the same name during output. In this
	// example we're assigning the values directly. In
	// practice, one would typically obtain the values from
	// a database or other source such as a CGI list from
	// another form.
	server( "lname" ) = "Smith" ;
	server( "fname" ) = "John" ;

	// Note that since the input field named 'email' already
	// has a value, the following line of code has no effect.
	server( "email" ) = "johnsmith@xyz.com" ;

	// Output the page containing the form, performing
	// the value replacements for empty form fields that
	// have matching names in the server's CGI list.
	server << page ;
	return 0 ;
	}