How to display length of filtered ng-repeat data

How to display length of filtered ng-repeat data

I have a data array which contains many objects (JSON format). The following can be assumed as the contents of this array:
var data = [
{
“name”: “Jim”,
“age” : 25
},
{
“name”: “Jerry”,
“age”: 27
}
];

Now, I display these details as:

Solutions/Answers:

Solution 1:

For Angular 1.3+ (credits to @Tom)

Use an alias expression (Docs: Angular 1.3.0: ngRepeat, scroll down to the Arguments section):

<div ng-repeat="person in data | filter:query as filtered">
</div>

For Angular prior to 1.3

Assign the results to a new variable (e.g. filtered) and access it:

<div ng-repeat="person in filtered = (data | filter: query)">
</div>

Display the number of results:

Showing {{filtered.length}} Persons

Fiddle a similar example. Credits go to Pawel Kozlowski

Solution 2:

For completeness, in addition to previous answers (perform calculation of visible people inside controller) you can also perform that calculations in your HTML template as in the example below.

Assuming your list of people is in data variable and you filter people using query model, the following code will work for you:

<p>Number of visible people: {{(data|filter:query).length}}</p>
<p>Total number of people: {{data.length}}</p>
  • {{data.length}} – prints total number of people
  • {{(data|filter:query).length}} – prints filtered number of people

Note that this solution works fine if you want to use filtered data only once in a page. However, if you use filtered data more than once e.g. to present items and to show length of filtered list, I would suggest using alias expression (described below) for AngularJS 1.3+ or the solution proposed by @Wumms for AngularJS version prior to 1.3.

New Feature in Angular 1.3

AngularJS creators also noticed that problem and in version 1.3 (beta 17) they added “alias” expression which will store the intermediate results of the repeater after the filters have been applied e.g.

<div ng-repeat="person in data | filter:query as results">
    <!-- template ... -->
</div>

<p>Number of visible people: {{results.length}}</p>

The alias expression will prevent multiple filter execution issue.

I hope that will help.

Solution 3:

The easiest way if you have

<div ng-repeat="person in data | filter: query"></div>

Filtered data length

<div>{{ (data | filter: query).length }}</div>

Solution 4:

ngRepeat creates a copy of the array when it applies a filter, so you can’t use the source array to reference only the filtered elements.

In your case, in may be better to apply the filter inside of your controller using the $filter service:

function MainCtrl( $scope, filterFilter ) {
  // ...

  $scope.filteredData = myNormalData;

  $scope.$watch( 'myInputModel', function ( val ) {
    $scope.filteredData = filterFilter( myNormalData, val );
  });

  // ...
}

And then you use the filteredData property in your view instead. Here is a working Plunker: http://plnkr.co/edit/7c1l24rPkuKPOS5o2qtx?p=preview

Solution 5:

Since AngularJS 1.3 you can use aliases:

item in items | filter:x as results

and somewhere:

<span>Total {{results.length}} result(s).</span>

From docs:

You can also provide an
optional alias expression which will then store the intermediate
results of the repeater after the filters have been applied. Typically
this is used to render a special message when a filter is active on
the repeater, but the filtered result set is empty.

For example: item in items | filter:x as results will store the
fragment of the repeated items as results, but only after the items
have been processed through the filter.

Solution 6:

It is also useful to note that you can store multiple levels of results by grouping filters

all items: {{items.length}}
filtered items: {{filteredItems.length}}
limited and filtered items: {{limitedAndFilteredItems.length}}
<div ng-repeat="item in limitedAndFilteredItems = (filteredItems = (items | filter:search) | limitTo:25)">...</div>

here’s a demo fiddle