Webapp::autoFill(3) Automatically fill a HTML form


Void autoFill( ElementTree form, DataSource mainvars, Dict<String, [String]> extravars=Dict::new() )


form The form element (or a subset of that if you only wish to automatically fill a part of the form.

mainvars The data source to use (e.g. DataPost )

extravars An optional dictionary mapping keys to lists of values, to allow a form to be automatically filled from a database. You may or may not need to use DataNone as your main data source in this case.


Automatically fill a HTML form based on data from a particular data source. This makes it easy to construct web forms with error handling - see the webapp tutorial for more information.

 ElementTree OnHello(Int dummy) {
     div = anonymousBlock; // we create this temporarily.
     fname = incomingValue("fname",DataPost);
     lname = incomingValue("lname",DataPost);
     if (fname != "" && lname != "") {
         p = addParagraph(div,"Hello "+fname+" "+lname);
         return p;
     } else {
         form = HelloForm();
 // if they entered one of first and last name, make sure it's still in the form
         return form;
 ElementTree helloForm() {
     parent = anonymousBlock;
     form = addLocalForm(parent);
     f1 = addFieldset(form,"Who are you?");
     input = addLabelledInput(f1,"Your First Name",InputText,"fname","",0);
     input = addLabelledInput(f1,"Your Last Name",InputText,"lname","",0);
     submit = addLocalControlInput(f1,"Say hello",OnHello,1);
     return form;


Kaya standard library by Edwin Brady, Chris Morris and others ([email protected]). For further information see http://kayalang.org/


The Kaya standard library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (version 2.1 or any later version) as published by the Free Software Foundation.