Angular ng-repeat conditional wrap items in element (group items in ng-repeat)

问题

I\'m trying to group the items in a ng-repeat using a condition.

An example condition is to group all elements with the same hour.

The data:

[
    {name: \'AAA\', time: \'12:05\'},
    {name: \'BBB\', time: \'12:10\'},
    {name: \'CCC\', time: \'13:20\'},
    {name: \'DDD\', time: \'13:30\'},
    {name: \'EEE\', time: \'13:40\'},
    ...
]

The \'time\' field is actually a timestamp (1399372207) but with the exact time the example output is easier to understand.

I am listing these items using ng-repeat:

<div ng-repeat=\"r in data| orderBy:sort:direction\">
   <p>{{r.name}}</p>
</div>

also tried with:

<div ng-repeat-start=\"r in data| orderBy:sort:direction\"></div>
    <p>{{r.name}}</p>
<div ng-repeat-end></div>

A valid output is:

<div class=\"group-class\">
    <div><p>AAA</p></div>
    <div><p>BBB</p></div>
</div>
<div class=\"group-class\">
    <div><p>CCC</p></div>
    <div><p>DDD</p></div>
    <div><p>EEE</p></div>
</div>

My last option if there isn\'t a simple solution for my problem would be to group the data and then assign it to the scope variable used in ng-repeat.

Any thoughts?

回答1:

You can use groupBy filter of angular.filter module.
so you can do something like this:

usage: collection | groupBy:property
use nested property with dot notation: property.nested_property
JS:

$scope.players = [
  {name: 'Gene', team: 'alpha'},
  {name: 'George', team: 'beta'},
  {name: 'Steve', team: 'gamma'},
  {name: 'Paula', team: 'beta'},
  {name: 'Scruath', team: 'gamma'}
];

HTML:

<ul ng-repeat="(key, value) in players | groupBy: 'team'">
  Group name: {{ key }}
  <li ng-repeat="player in value">
    player: {{ player.name }} 
  </li>
</ul>

RESULT:
Group name: alpha
* player: Gene
Group name: beta
* player: George
* player: Paula
Group name: gamma
* player: Steve
* player: Scruath

UPDATE: jsbin

回答2:

First make group in Controller:

 $scope.getGroups = function () {
    var groupArray = [];
    angular.forEach($scope.data, function (item, idx) {
        if (groupArray.indexOf(parseInt(item.time)) == -1) {
            groupArray.push(parseInt(item.time));
        }
    });
    return groupArray.sort();
};

Then Make a Filter for it:

 myApp.filter('groupby', function(){
    return function(items,group){       
       return items.filter(function(element, index, array) {
        return parseInt(element.time)==group;
       });        
    }        
 }) ;

Then Change Template:

 <div ng-repeat='group in getGroups()'>
     <div ng-repeat="r in data | groupby:group" class="group-class">
         <div><p>{{r.name}}</p></div>
     </div>
 </div>

SEE DEMO

回答3:

Just a simple HTML solution for static groups.

<ul>
  Group name: Football
  <li ng-repeat="player in players" ng-if="player.group == 'football'">
    Player Name: {{ player.name }} 
  </li>
  Group name: Basketball
  <li ng-repeat="player in players" ng-if="player.group == 'basketball'">
    Player Name: {{ player.name }} 
  </li>
</ul>

Output:

Group name: Football
- Player Name: Nikodem
- Player Name: Lambert
Group name: Basketball
- Player Name: John
- Player Name: Izaäk
- Player Name: Dionisia

来源：https://stackoverflow.com/questions/23493063/angular-ng-repeat-conditional-wrap-items-in-element-group-items-in-ng-repeat

标签

angularjs

angularjs-ng-repeat

ng-repeat