Reusable form functions

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  • Toby Inkster

    Reusable form functions

    Like me, you are probably confronted with many requests for surveys,
    questionnaires, feedback forms, registration forms and so forth: forms
    where the processing requirements are very simple (store in a database or
    e-mail to a particular address).

    Despite the simple requirements, there is often quite a lot of work
    involved: crafting a database to store results, writing a function to
    store the data to the database, one to verify submitted data (e.g. make
    sure that if you've asked for an e-mail address, it contains an @-sign),
    and marking up the form itself (which can be quite a task if you want to
    make correct use of <label>, <th scope="blah">, etc.

    So I introduce my reusable form functions, with the rather unglamorous
    name of inc_surveytool. php v1.0.




    They are far from finished (expect a 1.1 and a 2.0 version soon -- I have
    big plans for them). Despite being 1.0, I think there is still a lot of
    work to be done, and I'd like some feedback.

    If you needed to sum them up in one pithy line: It's an entire programming
    language for creating and validating HTML forms.

    Here is an example of what you can do with them:

    <?php
    include 'inc_surveytool .php';

    print "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\"\n";
    print " \"http://www.w3.org/TR/html4/strict.dtd\">\n ";
    print "<title>Exa mple Form</title>\n";

    $widgets = "Form
    mailto=me@examp le.com
    multiplesubmiss ions=1
    showsubmissions =0

    Text 1 100 / /
    name=Please enter your name:

    Integer 1 150
    age=Please enter your age:

    Multi 1 3
    statements=Whic h of these statements do you agree with?
    1=Foo is good.
    2=Bar is good.
    3=Quux is good.
    4=Flibble is good.
    5=Blah is good.

    GridSingle
    satisfaction=Pl ease rate the following.
    Cols
    1=Excellent
    2=Good
    3=Average
    4=Poor
    5=Rubbish
    Rows
    foo=Foo
    bar=Bar
    qux=Quux
    flb=Flibble
    blh=Blah

    Units Volume 5
    vol=How much do you like Foo?";

    form_Main($widg ets);
    ?>

    This will display a semantically– marked-up (even nicely indented!) form
    containing:

    * an input for the user's name, which will be checked to be between 1
    and 100 digits, and checked that it matches the perl-compatible
    regular expression / / (i.e. it must contain a space character);

    * an input for the user's age, which will be checked to be an integer
    between 1 and 150 upon submission;

    * five checkboxes asking them what they agree with: they must tick
    between 1 and 3 boxes;

    * a table allowing the user to rate some things on a scale of 1 to 5;

    * an input allowing the user to enter a physical volume in a choice of
    kilolitre, litre, millilitre, brpint, fluidounce, m^2, cm^2, mm^2
    with m^2 being the default.

    When the form is submitted, it will be validated and e-mailed to
    me@example.com. The submission will be stored in a database. You would be
    able to visit the form, adding a query string "?adminscreen=1 " to view the
    results. (Security is handled by editing a function called form_WhoisAdmin
    which can test for IP address, cookies, session data, etc.)

    (Oh, and the physical volume I mentioned is converted to litres and stored
    in both the user's chosen units, and the converted units for easier
    sorting!)

    If the users are logged in, or may be uniquely identified somehow (exactly
    how to identify each user is specified in function form_Whois, which can
    be customised for your own site) then it is possible to allow or disallow
    multiple submissions for one user, and to control what happens when there
    are multiple submissions (the new submission could over-write the old one,
    or the submissions could be stored alongside each other). Users returning
    to the form are able to view previous submissions.

    Anyway, all this is only the tip of the iceberg -- it's a very flexible,
    very capable library of form-building functions.

    The reason I post is that I'd like some other people to try it out and get
    a feel for how it works and what more is needed. I'd also like people to
    point out any obvious security flaws.

    Requirements:

    * PHP 4.3;

    * an SQL database (PostgreSQL supported, MySQL has been catered
    for, but not properly tested);

    * GNU Units ("/usr/bin/units") if you want to be able to use the
    Units widget.

    There is almost zero documentation, so if you'd like to use it, do drop me
    an e-mail (mail at tobyinkster.co. uk) and I'll try to answer any
    questions. If there is demand, I might even set up a mailing list.

    --
    Toby A Inkster BSc (Hons) ARCS
    Contact Me ~ http://tobyinkster.co.uk/contact
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