Sorry for not responding sooner...
Binding has some "smarts" that are getting in your way here. Essentially
the first time binding looks at a value it checks to see if the value is
null, undefined, or empty string. If it is any of those it will not copy
the value over. Until the value has turned into something that is not one
of those "non-values" it binding does not execute. The reason we do this is
that many times there is to allow the destination of a binding to have an
initial value that does not disappear until a real replacement is ready.
For example, if we did not do this logic and you used binding from a web
service to populate an image source, rather than the image not loading until
the web service had returned, you'd see the "image not found" icon.
So, this is why you have no values. And it's also why the test where you
try to return '' isn't working, the '' is empty-string which means "don't
copy." So what I'd do as a quick workaround is go ahead and simply write an
initialize handler that sets all of the web service request properties to
null.
<mx:Script>
function initWS()
{
wsCustomer.methCustMatches.request.txtZip = null;
wsCustomer.methCustMatches.request.txtLastLastName = null;
wsCustomer.methCustMatches.request.txtFirstName = null;
...
}
</mx:Script>
Sorry for the confusion,
Matt
-----Original Message-----
From: hecubus_eh
To: flexcoders@yahoogroups.com
Sent: 3/30/2005 9:12 PM
Subject: [flexcoders] Help with binding null data to web service parameters.
I'm building a simple Flex form that has several TextInput fields
that a person can use as search criteria. They are basically
optional fields.
The text from the TextInput fields are bound directly to a set of web
service request parameters that is sending to a CFC-based WSDL.
The problem I'm running into is that if any of the TextInput fields
are not filled in by the user, no value is being passed to the web
service request
parameters that the TextInput.text values are bound to. The result
is that they are
treated as null by the WebService and the parameters are not sent in
the SOAP request.
Since all parameters are required in a WSDL, the web service is
resulting in a SOAP
message that some parameters are not being passed into the request.
Here is a code snippet:
--------------------------------
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml
<http://www.macromedia.com/2003/mxml> "
xmlns:r="view.*" pageTitle="Customer Search" initialize="">
<mx:WebService
wsdl="http://localhost/Customer.cfc?wsdl
<http://localhost/Customer.cfc?wsdl> " id="wsCustomer">
<mx:operation name="methCustMatches">
<mx:request>
<txtZip>{txtZip.text}</txtZip>
<txtLast>{txtLastName.text}</txtLast>
<txtFirst>{txtFirstName.text}</txtFirst>
<txtPhone>{txtPhone.text}</txtPhone>
<txtCompany>{txtCompany.text}</txtCompany>
<CustomerNumber>{CustomerNumber.text}</CustomerNumber>
</mx:request>
</mx:operation>
</mx:WebService>
<mx:Script>
<![CDATA[
function sendReq(event) {
wsCustomer.methCustMatches.send();
}
]]>
</mx:Script>
<mx:TextInput text="" id="numShipTo" width="100" maxChars="9"
restrict="0-9" />
<mx:TextInput text="" id="txtPhone" width="100" enabled="false"
maxChars="12" /
>
<mx:TextInput text="" enabled="false" id="txtCompany" width="100"
/>
<mx:TextInput text="" id="txtZip" width="50" maxChars="11" />
<mx:TextInput text="" id="txtFirstName" width="75" />
<mx:TextInput
id="txtLastName" width="75" />
<mx:Button id="submitForm" label="Go" textAlign="center"
click="sendReq(event);"/
>
</mx:Application>
--------------------------------
That's the first problem...is there a way to explicitly send the
parameters that have no
value, basically as if I did not bind any variables to the request
parameters? If I send the
request with no value inside the parameters (e.g.
<txtPhone></txtPhone>), the
parameters are sent in the SOAP request with no values, which is fine
since the WSDL
doesn't yell at me for not providing all the parameters.
While debugging this problem, instead of binding the TextInput text
value directly to the
WebService request parameters, I bound the values to a data model and
used the model as
a value object. I then bound the properties of the object to the
corresponding parameters
in the WebService request. The same error resulted, BUT...I tried to
use the following code
to determine what the value of the TextInput.text was for each
TextInput:
--------------------------------
<mx:Model id="modelCS">
...
<txtCompany>{txtCompany.text == undefined ? 'foo':
txtCompany.text}</txtCompany>
...
</mx:Model>
--------------------------------
I expected the value of modelCS.txtCompany to be 'foo', but I ended
up with modelCS.txtCompany resulting in '', which incidentally the
WebService
recognized as an empty string. Strangely enough, if I used ''
instead of 'foo' in my simple
logic test inside the data model, it resulted in modelCS.txtCompany
to be undefined.
Does anyone have any idea what's happening here??? I'll be more than
happy to go into any more detail if necessary.
Thanks,
Rick...
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