have the previous item available in ng-repeat #10362
Description
I'm quite new to Angular, and was looking for a convenient way to create headers in a ng-repeat list (like first letter headers in a list of names, or month headers in a list of dates).
It occurred to me it would really help if the previous item would be available in the loop, so headers could be created by:
<html lang="en" ng-app="prevValueDemo">
<head>
<script src="git/angular.js/build/angular.js"></script>
</head>
<body ng-controller="prevController">
<p ng-repeat="nr in nrs">
<!-- note: below is nr_prev the previous value now !!!! -->
<span ng-if="(nr-nr%10)/10!=(nr_prev-nr_prev%10)/10" >
<br><b>{{(nr-nr%10)/10}}0</b> <br>
</span>
<span>
{{nr}}
</span>
</p>
<script>
var prevValueDemo = angular.module('prevValueDemo', []);
prevValueDemo.controller('prevController', ['$scope', function($scope) {
$scope.nrs = [12,14,15,22,23,45,46,76,78,79,80,83,99];
}]);
</script>
</body>
</html>to get:
10
12
14
15
20
22
23
40
45
46
70
76
78
79
80
80
83
90
99
This proved to be quite simple to add to Angular. And it helps me in a project to create headers like this, and even totally different ones (or no headers at all) depending on the sorting. My change:
https://github.com/digitalica/angular.js/commit/7fce7d159b2d16280cbd844cc89360398a420093
I'm not so sure this fits the Angular way of doing things though. Especially at my simple choice of name (postfixing '_prev' to 'nr' in this case).
If it does, i'll run tests & checks, test it in combination with filtering and create a merge request. If it doesn't I'm open to suggestions for another approach.