Aestiva H2O Web Site

Installation:
  Free Downloads
  The H2O Family
  Install Notes

Programming:
  Prerequisites
  H2O Whitepaper
  Online Manual
  Code Examples
  H2O Free Support

What's H2O?
H2O is programming made for the web.

What's it like?
H2O is English-like. If you know some Perl, VB, ASP, or PhP you'll be immediately productive in H2O. It runs on Linux, Mac, Unix, and Windows.

How do I try it?
Download H2O for free. Get it from hosting providers. Or buy on-line.

Where does H2O come from?
The language was invented by Aestiva. H2O stands for:
   HTML with
   HTML/OS
   Overlays.

Integration with HTML

H2O is integrated with HTML forms. H2O variables automatically set values of HTML form components. For example, writing:

<<mystate="AK">>
<select name=mystate>
<option value="AL">Alabama
<option value="AK">Alaska
<option value="AR">Arkansas
</select name=mystate>

brings up a pull-down menu with Alaska pre-selected. There is no need
to use the HTML form tag "SELECTED" to set the default. Likewise, writing:

displays an input box containing the value of the variable myname. There is no need to set the VALUE in the form component.
In H2O HTML form elements reflect the H2O variable environment. This features spans across all kinds of HTML form components.

Multi-page
When variables are set in H2O their
values are retained for the entire user-session. Let's say, for example, you write:

myheader="Page Header Here"

Then placing <<DISPLAY myheader /DISPLAY>> at the top of
any page will display the value stored in myheader.

Name-Value Pairs
Hypertext links can contain name-value pair that set values when clicked.
For example, writing:

<A HREF=products.html NAME=SKU value=100>Quark Screwdriver</A>

sets the value of the variable SKU to 100 when Quark Screwdriver is clicked.

Submit Button Control
The name of submit buttons, when clicked, are written to the variable HTMLOS.CLICKED. Consider the simple text editor:

<<myfile="/backend/file1.txt"
COPY FILE=myfile TO mytext /COPY
>>
<HTML>
File: <<myfile>>

<FORM METHOD=POST ACTION=EditFile>
<INPUT TYPE=SUBMIT NAME=mySave VALUE="Save">
<INPUT TYPE=SUBMIT NAME=myReload VALUE="Reload">
<INPUT TYPE=SUBMIT NAME=myExit VALUE="Cancel/Exit"><BR>
<TEXTAREA NAME=mytext COLS=65 ROWS=10></TEXTAREA>
</FORM>
</HTML>
<<OVERLAY EditFile

  IF HTMLOS.CLICKED="mySave" THEN
    COPY mytext TO FILE=myfile /COPY
    GOTO PAGE
  ELIF HTMLOS.CLICKED="myExit" THEN
    GOTO "login.html"
  ELIF HTMLOS.CLICKED="myReload" THEN
    GOTO PAGE
  /IF
GOTO PAGE
>>