Hi Ionel,
I think https://github.com/Polymer/polymer-expressions/issues/28 and [this
post](
https://groups.google.com/forum/#!msg/polymer-dev/fTOKXcOT_3U/qqlV1l5Be3IJ)
on polymer-dev are related.
>From Steve:
*....Polymer does not currently observe object or array mutations directly
as dependencies. However, if a property that is an object or array itself
changes, this will be noticed. *
*There is one exception to this which is an array that is repeated. That
array is observed for array mutations (additions/removals)....*
So even if you just have <p>items(buggy): {{ data }}</p>, the value won't
update when you remove an item. The data array itself is not
changing. <p>items: {{ data.length && data|json }}</p> works because the
data's .length property is a dependency in the expression. When the array
is mutated, data.length changes, thus evaluating the expression. See the
explanation in the last paragraph here
<http://www.polymer-project.org/docs/polymer/expressions.html#filters>.
One workaround is to re-evaluate the expression using this approach:
<template repeat="{{ item in data | addone }}" if="{{data.length}}">
or do a full re-assignment of the array at the right time:
this.data = this.data.splice(0);
Example: http://jsbin.com/dadelituniya/1/edit. Removing an item will update
the the view. The second example updates when the "reassign" button is
pressed.
On Tue, Sep 9, 2014 at 4:17 PM, Ionel Maries Cristian <[email protected]>
wrote:
> Hello,
>
> It appears that if I add a filter in a repeating template (like <template
> repeat="{{ item in data|myfilter }}">) it will break the databindings (dom
> doesn't get updated on data changes).
>
> It also appears there's a similar issue when filters are used inside the
> template (like {{ myvar|myfilter }}).
>
> I have example code reproducing the issue here:
> http://jsbin.com/qivaje/1/edit
>
> Is this a bug or I'm doing something wrong?
>
>
> Thanks,
> -- Ionel M.
>
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