How would I use AngularJS ng-repeat
to display the following HTML (Twitter Bootstrap Scaffolding)? Essentially, every third record I need to close the </div>
, print an <hr>
, then open another <div class="span4">
<div class="row">
<div class="span4">
<h3>
Project A
</h3>
</div>
<div class="span4">
<h3>
Project B
</h3>
</div>
<div class="span4">
<h3>
Project C
</h3>
</div>
</div>
<hr>
<div class="row">
<div class="span4">
<h3>
Project D
</h3>
</div>
<div class="span4">
<h3>
Lab Title
</h3>
</div>
<div class="span4">
<h3>
Project E
</h3>
</div>
</div>
I've created a fiddle for code demos.
http://jsfiddle.net/ADukg/261/
Here's a way:
<div ng-controller="MyCtrl">
<div ng-repeat="project in projects">
<span ng-if="$index % 3 == 0">
<hr />
<div class="row">
<h3 class="span4" ng-if="projects[$index+0]">{{projects[$index+0]}}</h3>
<h3 class="span4" ng-if="projects[$index+1]">{{projects[$index+1]}}</h3>
<h3 class="span4" ng-if="projects[$index+2]">{{projects[$index+2]}}</h3>
</div>
</span>
</div>
</div>
This way will also work if you have for example 7 data items: on the last 3 data, it will only show item 7 and not try to show the nonexistant item 8 and 9.
EDIT: Updated to use ng-if & angular 1.2.12
Moving on from the more easy answer. I dislike the original solution because of the empty dom elements it produces. This is for 3 divs per row.
<div ng-controller="ModulesCtrl">
<div class="row" ng-repeat="i in fields.range()">
<div class="span4" ng-repeat="field in fields.slice(i,i+3)">
<h2>{{field}}</h2>
</div>
</div>
</div>
In function FieldsCtrl($scope):
$scope.fields.range = function() {
var range = [];
for( var i = 0; i < $scope.fields.length; i = i + 3 )
range.push(i);
return range;
}
If you know fields.length you can in place of fields.range() use [0,3,6,9] etc
A more elegant way is to use the view model to provide a chunked collection and then let the view handle it like
<div ng-controller="Controller">
Projects <input ng-model="projects"></input>
<hr/>
<div ng-repeat="row in rows">
<div ng-repeat="project in row">
Projects {{project}}
</div>
<hr/>
</div>
</div>
and the coffeescript is pretty simple
# Break up an array into even sized chunks.
chunk = (a,s)->
if a.length == 0
[]
else
( a[i..i+s-1] for i in [0..a.length - 1 ] by s)
@Controller = ($scope)->
$scope.projects = "ABCDEF"
$scope.$watch "projects", ->
$scope.rows = chunk $scope.projects.split(""), 3
angular.bootstrap(document, []);
To keep view logic out of the controller and have a more re-usable solution, you can create a custom filter that splits the array into row groups:
angular.module('app').filter('group', function() {
/**
* splits an array into groups of the given size
* e.g. ([1, 2, 3, 4, 5], 2) -> [[1, 2], [3, 4], [5]]
*/
return function(array, groupSize) {
return _.groupBy(array, function(val, index) {
return Math.floor(index / groupSize);
});
};
});
And in the view:
<div class="row" ng-repeat="group in projects | group:3">
<div class="span4" ng-repeat="project in group">
{{project}}
</div>
</div>
To include the hr you can use the ng-repeat start and end points:
<div class="row" ng-repeat-start="group in projects | group:3">
<div class="span4" ng-repeat="project in group">
{{project}}
</div>
</div>
<hr ng-repeat-end />
ng-repeat-start and ng-repeat-end end points seems a convenient way to achieve this :
Which leads to simple code
<div ng-controller="MyCtrl">
<div ng-repeat-start="project in projects">
<span>
<div class="row">
<h3 class="span4">{{project}}</h3>
</div
</span>
</div>
<hr ng-repeat-end ng-if="($index + 1) % 3 == 0" />
</div>
See this jsfiddle