I want to iterate over an enumerable and display a counter
<div template repeat="{{ name in names }}">
###. {{name}}
</div>
What should I put instead of ### so it shows the position of the name:
1. John Doe
2. Jane Doe
3. etc...
11
votes
4 Answers
17
votes
Polymer now has the ability to do this:
<template repeat="{{fruit in fruits | enumerate}}">
<li>You should try the {{fruit.value}}. It is number {{fruit.index}}.</li>
</template>
Example taken from https://github.com/sethladd/dart-polymer-dart-examples/blob/master/web/iterate_loop_index/my_example.html
7
votes
The other solutions do not work for me in Polymer 0.3.4 (anymore?), but there is documentation on templates, including indexing while looping over a collection:
<template repeat="{{ foo, i in foos }}">
<template repeat="{{ value, j in foo }}">
{{ i }}:{{ j }}. {{ value }}
</template>
</template>
2
votes
It was available in web_ui but is not yet available in Polymer.
Web UI is the precursor to polymer.dart. Polymer.dart is almost at feature parity with Web UI. Below is a list of Web UI features that have not yet been implemented in polymer.dart:
Value of index variable available inside of loops
Until then, you can use asMap on the list and iterate over the keys:
<template repeat="{{i in names.asMap().keys)}}">
<div>{{i}}: {{names[i]}}</div>
</template>
