Unbinding a model does not completely make the template's contents disappear #11983
Comments
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it sure sounds like a bug. will need to double check against the JS version, as well as our bleeding_edge version (which contains many fixes since last pkg release) |
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Apologies, I should have included this info: Dart Editor version 0.6.5_r25017 mdv: polymer: |
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FWIW I still see the bug. I updated to Dart Editor version 0.6.9_r25388 polymer: mdv: |
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yeah, I don't think any significant changes were picked up yet... that build is from Friday, all my catch-up CL's including the one that changes setting model, landed this week. let me try against bleeding edge. |
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I was able to reproduce it in JavaScript. Moving issue over to MDV tracker: Added MovedToGithub label. |
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Thanks for taking a look! |
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This behavior now works in polymer.js. I opened https://code.google.com/p/dart/issues/detail?id=12687 to track the port to polymer.dart |
sethladd
added
Type-Defect
closed-duplicate
Consider this code:
<!DOCTYPE html>
<html>
<head>
<title>index</title>
</head>
<body>
<p>
The below will appear and disappear as a model object is
bound and unbound from the template. Conditionals are implemented
simply as "this template appears if something is bound" and
"this template disappears if nothing is bound".
</p>
<template id="tmpl" bind>
<p>Hello {{msg}}</p>
</template>
<script type="application/dart" src="index.dart"></script>
<script src="packages/browser/dart.js"></script>
</body>
</html>
import 'dart:html';
import 'package:mdv/mdv.dart' as mdv;
import 'dart:async';
class Message {
String msg;
}
main() {
mdv.initialize();
var message = new Message()..msg = 'world';
var template = query('#tmpl');
new Timer.periodic(const Duration(seconds: 1), (_) {
if (template.model != null) {
template.model = null;
} else {
template.model = message;
}
});
}
My understanding is that, if no model is bound to the template, the contents of the template disappear from the DOM.
However, I only see 'world' appear and disappear. For the first second, I don't see 'Hello'. After one second, I see 'Hello, World', then 'Hello' then 'Hello World' etc
Bug?
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