Delphi automatically calls the
TWebActionItem who's PathInfo property
matches the PretendDirectory.
If the PretendDirectory is omitted, then the
PathInfo property
of the associated ActionItem
should be empty; however,
if the ActionItem's Producer property has a value,
then the PathInfo should be a single forward slash (/).
(In that case, a null value is not allowed.)
As long as the Producer property is blank
the PathInfo property can be blank.
However, once the Producer property has a value,
use a single forward slash (/) if you don't want
an explicit pretend directory.
The way an html page links to a Delphi web server depends on where the link is.
In both of these examples, the html is generated by the server.
When a reference is in an anchor link, the name of the server must be included.
When using a barcode reader as a keyboard wedge
(the software pretends that a user is typing the scanned value),
I want the web server called each time the barcode is read.
This is one way to accomplish that.
The web page is designed as a data entry form
When the page is displayed, javascript automatically
places the input focus (the cursor) on the correct field
The barcode reader is configured
to add a tab character to the end of the barcode
(this causes the field's onchange to be called)
The data entry field is configured so that onchange
calls a routine that sends the data back to the server
This code calls a function each time the data changes
When a single web page is called over and over,
each call is placed in the browser's history list.
There are many times that this is acceptable, and others where it is not.
According to -
irt.org | Knowledge Base | JavaScript | History |
Q244 (dated 2-28-05)
You cannot tell the browser to not store the URL in the history.
Several FAQs on this page provide work arounds to keep
data out of the History buffer. Based on the number of related questions,
there is an obvious need for a real solution.
In most applications, you can place a data entry field or button
anywhere you want.
Standard html does not provide this capability.
Traditionally, users have used tables and clear *.gif files to
fake it. Unfortunately,
the W3C Web Accessibility Initiative forbids this method.
(Useful formatting is not fair to disabled users that can
not understand the formatting.)
These examples (produced via an
ASP.NET page) show how to use
style information inside individual elements
to explicitly control position.
This is how to use javascript to select a record with a select list (combobox).
Normally, forms are submitted via a button ... this is another way -
when a new value is selected, the form submits.
<script language="javascript">
<!--
function submitform()
{
var theform;
if (window.navigator.appName.toLowerCase().indexOf("netscape") > -1) {
theform = forms["Edit_Sphere_Assignments"];
}
else {
theform = Edit_Sphere_Assignments;
}
theform.submit();
}
// -->
</script>
<form method="POST"
action="edit" // Name of action path
id="Edit_Sphere_Assignments"
target="Select_Port"
>
<SELECT name="Port_Barcode" onchange="submitform();" >
<OPTION VALUE="NS1-E01">NS1-E01
<OPTION VALUE="NS1-E02">NS1-E02
</SELECT>
</form>
I searched the web to find this code - what I found DID NOT WORK (but it was close).
There are 2 apparent problems
theform = document.Edit_Sphere_Assignments fails
theform = Edit_Sphere_Assignments works
The form name property does not work - you have to use id
Specifically, these combinations fail (nothing happens)