Yup, this is https://github.com/Polymer/polymer-expressions/issues/28
On Tue, Sep 9, 2014 at 6:23 PM, Eric Bidelman <[email protected]> wrote: > 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. >> >> Follow Polymer on Google+: plus.google.com/107187849809354688692 >> --- >> You received this message because you are subscribed to the Google Groups >> "Polymer" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/polymer-dev/CANkHFr_vPurzhxEe1o11Qt-cxLrCDy%3DC5wrFQE%2B_us%2BfNLXSBw%40mail.gmail.com >> <https://groups.google.com/d/msgid/polymer-dev/CANkHFr_vPurzhxEe1o11Qt-cxLrCDy%3DC5wrFQE%2B_us%2BfNLXSBw%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > Follow Polymer on Google+: plus.google.com/107187849809354688692 --- You received this message because you are subscribed to the Google Groups "Polymer" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/polymer-dev/CAJup4OWRP3NeX1KKJnJRrncBMF7n4w1cLh9VFaFNtCkkQpWSRQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
