[Dojo-interest] Extending My custom Widget in 1.7.1 (Error : mixin #2 is not a callable constructor)

[swapnil22589]

Hi all,
I have created on widget which takes care of i18n in my application
(parentLabel.js)

now i m extending this widget to create new templated widget (label.js)

In this i am facing one error "mixin #2 is not a callable constructor" in
dojo.js
i am not able to identify exact coz of this error

My project structure is
http://dojo-toolkit.33424.n3.nabble.com/file/n3722666/custom1.jpg

My base widget is
http://dojo-toolkit.33424.n3.nabble.com/file/n3722666/custom4.jpg

My widget(label) which extends base widget(parentLabel) is

http://dojo-toolkit.33424.n3.nabble.com/file/n3722666/custom3.jpg

My index page is
http://dojo-toolkit.33424.n3.nabble.com/file/n3722666/custom2.jpg

finally error which i am getting is
http://dojo-toolkit.33424.n3.nabble.com/file/n3722666/custom5.jpg

Plz see to it,
and plz reply ASAP.

Waiting for reply ..

-----
Regards,
Swapnil :)
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[Karl Tiedt]

you arent returning your widgets in your files... for AMD you have to
return the object you expect to be usable from that file... ie: return
declare("myNewWidget, [..... ], ......);

-Karl Tiedt

[swapnil22589]

Thanx Karl Tiedt,

i am having one query regarding your reply.
as u said, Is it compulsory to have return in code if we need to extend our
widget?

coz my above error ("mixin #2 is not a callable constructor") solved by ur
suggestion (ie. when i written return in parentLabel )
eg.
return declare("parentLabel",
[_WidgetBase],{
_i18n: i18n,
....

and in label.js

function(declare,_WidgetBase,_TemplatedMixin, parser,ready, parentLabel){

declare("label",
[_WidgetBase,_TemplatedMixin,parentLabel],{
templateString:"<div> ${translatedLabel}</div>"
......

in this case my lifecycle method are executed properly with out error.
but templateString is not rendered on page..

===========================================================

where as in other case i tried with

return declare("parentLabel",
[_WidgetBase],{
_i18n: i18n,
....

and

-----
Regards,
Swapnil :)
--

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[swapnil22589]

Hey , i got my code working,
changes i done are

in parentLabel.js
1)return statment (eg. return define("parentLabel"...... )
+
2) also added _TemplatedMixin in parentLabel.js

http://dojo-toolkit.33424.n3.nabble.com/file/n3725087/parentLabel.jpg

in label.js
no return statment..

==========================

code is working but my understanding is still not clear..
1) why to return from our widget..
and if in child class i m using return code is not running..

2) also one new question i came across.
if i want to specify template in child , is it necessory to have
_TemplatedMixin in base class??
coz when i have not putted it in my base class, template html was not
rendering
and after putting it is renderring..

-----
Regards,
Swapnil :)
--

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[Kitson Kelly]

On 8 February 2012 07:15, swapnil22589 <swapni...@gmail.com> wrote:

Hey , i got my code working,
changes i done are

in parentLabel.js
1)return statment (eg. return define("parentLabel"......  )
+
2) also added _TemplatedMixin in parentLabel.js


http://dojo-toolkit.33424.n3.nabble.com/file/n3725087/parentLabel.jpg

in label.js
no return statment..





==========================

code is working but my understanding is still not clear..
1) why to return from our widget..
and if in child class i m using return code is not running..

You aren't directly using the return code, but the loader and the define are using the return from your function to create the necessary constructor/prototype to be used by the application and registered as a module.

 

2) also one new question i came across.
if i want to specify template in child , is it necessory to have
_TemplatedMixin in base class??
coz when i have not putted it in my base class, template html was not
rendering
and after putting it is renderring..

Simple answer is yes.  That is exactly what the _TemplatedMixin does, adds support for a template to your Widget.