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The following example script provides two request procedures. The first procedure returns an HTML page for collecting a few fields of data from the user. The second procedure utilizes the data to generate a short story.
This example can be found in the examples/tcl/genstory.tcl file.
# Example 3a: Form generation and handling
#
# Two functions are registered. One generates and
# returns an HTML form, and the other processes
# the data in the form.
#
# Things to notice:
#
# * Different functions are registered to the same
# URL with different methods. Note that some browsers
# do not cache results properly when you do this.
#
# * The genstory function returns an error status
# (500) if the client doesn't pass in any form data.
#
# * Form data is stored in an ns_set, and accessed
# like any other set (e.g., header data).
#
# * A counter is used to loop through all the key
# value pairs in the form.
ns_register_proc GET /example/genstory genstoryform
ns_register_proc POST /example/genstory genstory
proc genstoryform {conn context} {
ns_return $conn 200 text/html \
"<HTML>
<HEAD>
<TITLE>Automatic Story Generator</TITLE>
</HEAD>
<BODY>
<H1>
Automatic Story Generator
</H1>
<FORM ACTION=http:/example/genstory
METHOD=POST>
Noun: <INPUT TYPE=text NAME=noun1><BR>
Noun: <INPUT TYPE=text NAME=noun2><BR>
Name: <INPUT TYPE=text NAME=name1><BR>
Name: <INPUT TYPE=text NAME=name2><BR>
Adjective: <INPUT TYPE=text NAME=adjective1><BR>
Adjective: <INPUT TYPE=text NAME=adjective2><BR>
Verb: <INPUT TYPE=text NAME=verb1><BR>
Verb: <INPUT TYPE=text NAME=verb2><BR>
<P><INPUT TYPE=submit VALUE=\"Generate\">
</FORM>
<P>
</BODY></HTML>
"}
proc genstory {conn ignore} {
set formdata [ns_conn form $conn]
if {$formdata == ""} {
ns_return $conn 200 text/plain "Need form data!"
return
}
# Build up a human-readable representation of the form data.
set hrformdata "<dl>"
set size [ns_set size $formdata]
for {set i 0} {$i < $size} {incr i} {
append hrformdata "<dt>[ns_set key $formdata $i]</dt>\
<dd>[ns_set value $formdata $i]</dd>"
}
append hrformdata "</dl>"
ns_return $conn 200 text/html \
"<HTML>
<HEAD>
<TITLE>The story of [ns_set get $formdata name1] and
[ns_set get $formdata name2]</TITLE>
</HEAD>
<BODY>
<H1>
The story of [ns_set get $formdata name1] and
[ns_set get $formdata name2]
</H1>
<P>Once upon a time [ns_set get $formdata name1] and
[ns_set get $formdata name2] went for a
walk in the woods looking for a [ns_set get $formdata noun1].
[ns_set get $formdata name1] was
feeling [ns_set get $formdata adjective1] because
[ns_set get $formdata name2] was so
[ns_set get $formdata adjective2]. So
[ns_set get $formdata name1] decided to
[ns_set get $formdata verb1] [ns_set get $formdata name2]
with a [ns_set get $formdata noun2]. This made
[ns_set get $formdata name2] [ns_set get $formdata verb2]
[ns_set get $formdata name1].
<P><CENTER>The End</CENTER>
The form data that made this possible:<BR>
$hrformdata
</BODY></HTML>"
}