Re: [Laszlo-dev] where does the flex compiler think "parent" is being bound in this event handler?

[Donald Anderson]

Once upon a time, I experimented with adding 'with  
(lzApplicationInstance)'
if I saw a 'withThis' pragma.  (lzApplication is a variable that  
points to
the application instance).  Not sure that is what is needed here...?
- Don

On Jan 9, 2008, at 11:23 PM, P T Withington wrote:

Well I thought our handlers were supposed to be compiled with  
'implicit this'.

Perhaps Don left this out, because this _is_ implicit in AS3 method  
bodies?  If so, we should make the tag compiler output anonymous  
handlers like this as methods not functions.  This would mean we  
would have to start emitting those anonymous singleton classes for  
views that add methods...

On 2008-01-09, at 23:06 EST, Henry Minsky wrote:

I've got a little test LZX code that has a click handler like this:

<view id="bar" x="200" y="200" >
  <view id="foo" bgcolor="0xcccccc" x="-100" y="-100"  height="200"
width="200"
        onclick="parent.animate('rotation', 360, 1500, true)"


When I compile it I get this error from the  flex compiler

/cygdrive/c/flex2/bin/mxmlc -debug=true
-library-path+=../../../lps/includes/lfc/LFC9.lzl  -default-size  
800 600
-default-frame-rate 60 DemoApp.as
Loading configuration file C:\flex2\frameworks\flex-config.xml
C:\users\hqm\openlaszlo\devildog\WEB-INF\lps\lfc\DemoApp.as(49):  
col: 20
Error: Call to a possibly undefined method animate through a  
reference with
static type flash.display:DisplayObjectContainer.

          parent.animate('rotation', 360, 1500, true)
                 ^

The handler is compiled to a function inside of the usual stuff  
passed to a
call to LzInstiateView:


LzInstantiateView({attrs: {id: "bar",
                         x: 200,
                         y: 200},
                 children: [{attrs:
                             {$delegates: ["onclick", "$m1", null,
"oninit", "$m2_foo_reference", null],
                              $m1: function foo_$m1() {
                      parent.animate('rotation', 360, 1500, true)
                  }, ...


So I am not sure in what context the compiler thinks that "parent"  
is being
looked up.


If I change the code to refer to "this.parent", it compiles  
happily, and
appears to work

 <view id="bar" x="200" y="200" >
  <view id="foo" bgcolor="0xcccccc" x="-100" y="-100"  height="200"
width="200"
        onclick="this.parent.animate('rotation', 360, 1500, true)"




--
Henry Minsky
Software Architect
[EMAIL PROTECTED]



--

Don Anderson
Java/C/C++, Berkeley DB, systems consultant

voice: 617-547-7881
email: [EMAIL PROTECTED]
www: http://www.ddanderson.com