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Writing A Multi-Currency Converter Using WMLScript (cont.)
by Wei Meng LEE
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The WML Deck
Let's take a look at the WML deck that loads the application (Currency.wml):
<![CDATA[
<?xml version='1.0'?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<card id="card1" title="Currency">
<p>
Currency to convert from:
<select name="fromCurrency">
<option value="USD">US$$</option>
<option value="SIN">S$$</option>
<option value="RM">RM</option>
</select>
Enter Currency: <input type="text" name="amount" format="*N"/>
Currency to convert to:
<select name="toCurrency">
<option value="USD">US$$</option>
<option value="SIN">S$$</option>
<option value="RM">RM</option>
</select>
<do type="accept" label="Calculate">
<go href="Calculate.asp#Convert($(amount))"/>
</do>
</p>
</card>
<card id="card2" title="Note">
<p>
Please select a different currency.
</p>
</card>
</wml>
]]>
There are two cards within the deck. The first card takes care of user input and once the user is done with it, links to the WMLScript:
<![CDATA[
<go href="Calculate.asp#Convert($(amount))"/>
]]>
Notice that I did not link to a WMLScript file with the .wmls file extension. Instead, I have pointed to an ASP file. What
I am doing here is to use Microsoft Active Server Pages to dynamically generate the WMLScript program. We will take a closer look at the
WMLScript program in the next section.
The amount to be converted is also passed as an input parameter to the function named Convert().
Next: The WMLScript Program
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