How to concat varible in vxml

问题

How to concat varible in VXML. consider following example VXML,

<?xml version="1.0" encoding="UTF-8"?>
<vxml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.w3.org/2001/vxml" version="2.0" xsi:schemaLocation="http://www.w3.org/2001/vxml  http://www.w3.org/TR/voicexml20/vxml.xsd">
    <form>
        <block>
            <audio src="{url1}"/>
            <audio src="{url2}"/>
        </block>
        <field name="dtmf">
            <option dtmf="1" value="1"/>
            <option dtmf="2" value="2"/>
            <option dtmf="2" value="3"/>
            <filled>
                <submit next="{url3}" namelist="action toneId dtmf" method="get"/>
            </filled>
        </field>
        <noinput>
            <reprompt/>
        </noinput>
        <nomatch>
            <reprompt/>
        </nomatch>
    </form>
</vxml>

{url3} = {some string} + {some variable=value}, I want to get like this, There are url3 get concating two value.

回答1:

Change:

<submit next="{url3}" namelist="action toneId dtmf" method="get"/>

<submit expr="{some string} + {some variable=value}" namelist="action toneId dtmf" method="get"/>

or for a more concrete example:

<submit expr="'http://yourserver.com/api/' + servletName" namelist="action toneId dtmf" method="get"/>

回答2:

The previous answer is correct, but let me add an additional line or two that shows how to use namelist and field.

<field name="dtmf">

That name is a bit confusing.You're defining a variable name, and "dtmf" is used elsewhere in the document; let's call it "response" instead to avoid problems.

<field name="response">

You allow for options, which is fine:

<option dtmf="1" value="1"/>
<option dtmf="2" value="2"/>
<option dtmf="2" value="3"/>

Of course the values can be anything, such as

<option dtmf="1" value="meat"/>
<option dtmf="2" value="fish"/>
<option dtmf="2" value="dairy"/>

and I want to point out here that the value above does not accept an ECMAScript value; it's just plain text, one of the oddities of VoiceXML.

Set up the values of the other variables you want to send:

<var name="toneId" expr="12"/>
<var name="action" expr="'scream'"/>

And expr does require an ECMAScript expression. "toneID" is set to a Number and "action" has been set to a String. You can also do this instead, if you need to:

<var name="foo" expr="'scream'"/>
<var name="action" expr="foo"/>

The field "response" will be filled in automatically with the value the user selected. You can also use the so-called "shadow variables" if you like and send them instead; see the VoiceXML spec http://www.w3.org/TR/2004/REC-voicexml20-20040316/#dml2.3.1.

Finally, as Jim says,

<submit expr="'http://example.com/api/' + servletName" namelist="action toneId response" method="get"/>

Hope this helps.

来源：https://stackoverflow.com/questions/32351207/how-to-concat-varible-in-vxml

标签

vxml