custom event handler matching is case sensitive

[jmesserly]

(reported by @ErikGrimes here: dart issue 14719 ... I'm not endorsing this one way or another, just passing it on :) )

What steps will reproduce the problem?

1. Create a custom element
2. Attach a custom event handler to the element 'on-polymerSelect'.
3. Call this.fire('polymerSelect').

What is the expected output? What do you see instead?

The handler bound to on-polymerSelect should fire.

The handler doesn't fire.

What version of the product are you using? On what operating system?

0.8.9 build 19720

Please provide any additional information below.

If the name of the handler is case insensitive, then firing the event should be case insensitive as well. Otherwise, event names have to be all lowercase which make them difficult to read and write. You
can improve legibility with underscores, but then you get funky event handlers line on-polymer_select.

[dannymk]

I can confirm this issue, the error returned is:

Exception: The null object does not have a getter '_observe@0x29474386'.

NoSuchMethodError : method not found: '_observe@0x29474386'
Receiver: null
Arguments: []
HtmlElement&Polymer.observeProperties (package:polymer/src/instance.dart:514:34)
HtmlElement&Polymer.prepareElement (package:polymer/src/instance.dart:153:22)
HtmlElement&Polymer.polymerCreated (package:polymer/src/instance.dart:139:21)
PolymerElement.PolymerElement.created (package:polymer/src/instance.dart:1088:19)

[jmesserly]

@dannymk your error looks different, can you file a bug at http://dartbug.com/new with instructions to reproduce?

it looks like you got a PolymerElement subtype with no associated polymer-element. You can try putting a breakpoint in prepareElement() in package:polymer/src/instance.dart and see what's going on. My guess is your @CustomTag("x-foo") doesn't match the <polymer-element name="x-foo"> ... anyway, we should have a better error message when that happens.

[dannymk]

Done:  http://code.google.com/p/dart/issues/detail?id=16469

On Friday, January 31, 2014 4:42 PM, John Messerly notifications@github.com wrote:

@dannymk your error looks different, can you file a bug at http://dartbug.com/new with instructions to reproduce?
it looks like you got a PolymerElement subtype with no associated polymer-element. You can try putting a breakpoint in prepareElement() in package:polymer/src/instance.dart and see what's going on. My guess is your @CustomTag("x-foo") doesn't match the ... anyway, we should have a better error message when that happens.
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[sorvell]

Dupe of #634