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continued from page one...
Here's
the sample code. Observe that I took a number of shortcuts.
What? No sign in dialog?
I've also left it as an exercise to the reader to populate
the 'messages' array and increment the 'msg_index' to
iterate through the user's mailbox.
<vxml version="2.0"
xmlns="http://www.w3.org/2001/vxml">
<script>
<![CDATA[
//
forward/reverse increments
var
FORWARD = 5000;
var
REVERSE = -5000;
var
FUDGE = 3000; // fudge factor to compensate for
reco lag
var
messages = []; // TODO: populate this an ordered
list of the user's v-mail messages
var
msg_index = 0; // TODO: Increment this after each
message is played
/*
Given:
start
- the approximate time when the audio was queued
increment
- the increment to move forward or backward in
the audio
oldOffset
- the previous offset into the audio
Calculate
and return the new offset.
*/
function
CalcOffset(start, increment, oldOffset)
{
var
elapsed = (new Date() - start);
var
newOffset = oldOffset + elapsed + increment -
FUDGE;
return
((newOffset < 0) ? 0 : newOffset);
}
]]>
</script>
<link
event="vmail.onquit">
<grammar
mode="voice" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>quit</item>
</one-of>
</rule>
</grammar>
</link>
<catch
event="vmail.onquit">
goodbye.
<disconnect/>
</catch>
<catch
event="connection.disconnect.hangup">
<log>caught
hangup</log>
</catch>
<catch>
<log>caught
unexpected event <value expr="_event"/></log>
I'm
sorry, but an error has occurred.
Please
try again later.
<disconnect/>
</catch>
<form
id="welcome">
<block>
Welcome
to the voice mail system.
<break
time="500ms"/>
<goto
next="#menu"/>
</block>
</form>
<form
id="menu">
<field
name="cmd">
<prompt
cond="messages.length == 1">
You
have 1 new message.
<break
time="500ms"/>
To
hear your message, say 'play message' or press
1.
</prompt>
<prompt
cond="messages.length > 1">
You
have <value expr="messages.length"/>
new messages.
To
hear your messages, say 'play messages' or press
1.
</prompt>
<prompt>
<break
time="300ms"/>
To
hear your mailbox options, say 'options' or press
2.
</prompt>
<grammar
mode="voice" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>play
messages<tag>1</tag></item>
<item>options<tag>2</tag></item>
</one-of>
</rule>
</grammar>
<grammar
mode="dtmf" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>1</item>
<item>2</item>
</one-of>
</rule>
</grammar>
<catch
event="noinput nomatch">
Sorry.
I didn't get that.
<reprompt/>
</catch>
<catch
event="noinput nomatch" count="3">
Sorry
we're having trouble.
Please
try again later.
<disconnect/>
</catch>
<filled>
<if
cond="1 == cmd">
<goto
next="#play"/>
<elseif
cond="2 == cmd"/>
Sorry.
This feature is currently unavailable.
<clear
namelist="cmd"/>
</if>
</filled>
</field>
</form>
<form
id="play">
<!--
track approx. time when prompt is queued -->
<var
name="start"/>
<var
name="curOffset" expr="0"/>
<!-- track offset into clip -->
<block
name="init">
<assign
name="start" expr="new Date()"/>
<!--
BUGBUG: In a real application, you would parameterize
this -->
First
message.
<break
time="300ms"/>
</block>
<field
name="msg">
<property
name="timeout" value="0s"/>
<property
name="termchar" value=" "/>
<property
name="inputmodes" value="dtmf"/>
<link
event="vmail.forward">
<grammar
mode="dtmf" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>3</item>
</one-of>
</rule>
</grammar>
</link>
<link
event="vmail.reverse">
<grammar
mode="dtmf" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>1</item>
</one-of>
</rule>
</grammar>
</link>
<link
event="vmail.stop">
<grammar
mode="dtmf" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>7</item>
</one-of>
</rule>
</grammar>
</link>
<link
event="help">
<grammar
mode="dtmf" version="1.0"
root="r" type="application/srgs+xml">
<rule
id="r" scope="public">
<one-of>
<item>0</item>
</one-of>
</rule>
</grammar>
</link>
<catch
event="vmail.forward">
<log>old
offset: <value expr="curOffset"/></log>
<assign
name="curOffset" expr="CalcOffset(start,
FORWARD, curOffset)"/>
<log>new
offset: <value expr="curOffset"/></log>
<assign
name="start" expr="new Date()"/>
<reprompt/>
</catch>
<catch
event="vmail.reverse">
<log>old
offset: <value expr="curOffset"/></log>
<assign
name="curOffset" expr="CalcOffset(start,
REVERSE, curOffset)"/>
<log>new
offset: <value expr="curOffset"/></log>
<assign
name="start" expr="new Date()"/>
<reprompt/>
</catch>
<catch
event="vmail.stop">
stop
<goto
next="#again"/>
</catch>
<catch
event="noinput">
<goto
next="#again"/>
</catch>
<catch
event="nomatch">
<!--
may want to provide your user with help on valid
DTMF here -->
Sorry
I didn't get that.
<throw
event="help"/>
</catch>
<help>
Press
1 to rewind. Press 3 to fast forward. Press 7
to stop.
Resuming
message.
<break
time="300ms"/>
<log>old
offset: <value expr="curOffset"/></log>
<assign
name="curOffset" expr="CalcOffset(start,
0, curOffset)"/>
<log>new
offset: <value expr="curOffset"/></log>
<assign
name="start" expr="new Date()"/>
<reprompt/>
</help>
<catch>
<log>unexpected
event <value expr="_event"/></log>
Sorry.
We are experiencing technical difficulties. Please
try again later.
<disconnect/>
</catch>
<prompt>
<!--
ask the server to return the .wav of the current
message -->
<audio
expr="'/cgi-bin/playmessage.cgi?msg_id='
+ messages[msg_index] + '&offset='
+
curOffset"/>
</prompt>
<!--
empty grammar; all reco is performed via links
-->
<grammar
mode="dtmf" version="1.0"
root="r" type="application/srgs+xml"/>
</field>
</form>
<form
id="again">
<field
type="boolean" name="yn">
<prompt>Do
you want to hear this message again?</prompt>
<catch
event="noinput nomatch">
Sorry.
I didn't get that.
<reprompt/>
</catch>
<catch
event="noinput nomatch" count="3">
Sorry
we're having trouble.
Please
try again later.
<disconnect/>
</catch>
<filled>
<if
cond="yn">
<goto
next="#play"/>
<else/>
Returning
to the main menu.
<break
time="300ms"/>
<goto
next="#menu"/>
</if>
</filled>
</field>
</form>
</vxml>
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