Registering custom element in Dart lang -

Registering custom element in Dart lang -

i've below custom element, , want register in same file

custombtn.dart:

class="lang-dart prettyprint-override">class submitfonix extends htmlelement { string name; mill submitfonix([string name]) => (new element.tag(tag) submitfonix) ..name=name ; submitfonix.created() : super.created() { ... }

currently, i'm registering element in main function, this:

class="lang-dart prettyprint-override">void main() { document.registerelement(submitfonix.tag, submitfonix); }

i wanted add together registration line custombtn.dart file, instead of having in main() function, if not!

in polymer.dart, noticed using below statement:

class="lang-dart prettyprint-override">@initmethod upgradepaperfocusable() => registerdarttype('paper-focusable', paperfocusable);

and in other file have:

class="lang-dart prettyprint-override">const initmethod = const initmethodannotation(); class initmethodannotation { const initmethodannotation(); }

so, tried using same concept, , updated custom element file as:

class="lang-dart prettyprint-override"> class submitfonix extends htmlelement { string name; mill submitfonix([string name]) => (new element.tag(tag) submitfonix) ..name=name ; submitfonix.created() : super.created() { ... } @initmethod upgradecustombtn() => document.registerelement(submitfonix.tag, submitfonix);

at execution, got this error in console:

class="lang-dart prettyprint-override">exception: type 'htmlelement' not subtype of type 'submitfonix' in type cast. submit_btn.dart:10 submitfonix.submitfonix.

submit_btn.dart:10 is: mill submitfonix([string name]) => (new element.tag(tag) submitfonix)

any thought?

@initmethod polymer annotation , can utilize if utilize polymer , assume not. if move registerelement away main have set function or method called straight or indirectly main.

dart