Data filtering based on multiple checkboxes in AngularJs. [HowTo]
Ok, this is just a quick post with some small pieces of code which shows how to filter data, to be precise a json object and present them in view. As you already know AngularJs is powerfull stuff, and this lines of code prooves that one more time. Have a look:
First the html:
<html ng-app="myApp">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script type='text/javascript' src="car.js"></script>
<body style="font-family:Verdana; font-size:14px;">
<div ng-controller="MyCtrl">
<h4>Pick a brand to see the models</h4>
<div ng-init="group = (cars | groupBy:'make')" style="width:100%">
<div ng-repeat="m in group" style="width:100px; float:left;">
<b><input type="checkbox" ng-model="useMakes[$index]"/>{{m}}</b>
</div>
</div>
<div style="clear:both;"></div>
<div>
<ul>
<li ng-repeat="car in cars | filter:filterMakes()"><p><b>{{car.make}} - {{car.model}}</b></p></li>
</ul>
</div>
</div>
</body>
</html>
And the javascript below:
var myApp = angular.module('myApp',[]);
function MyCtrl($scope, filterFilter) {
$scope.useMakes = [];
$scope.filterMakes = function () {
return function (p) {
for (var i in $scope.useMakes) {
if (p.make == $scope.group[i] && $scope.useMakes[i]) {
return true;
}
}
};
};
$scope.cars = [
{model: '316', make: 'Bmw'},
{model: '520', make: 'Bmw'},
{model: 'Fiesta', make: 'Ford'},
{model: 'Focus', make: 'Ford'},
{model: 'Clio', make: 'Renault'},
{model: 'Toledo', make: 'Seat'},
{model: 'Leon', make: 'Seat'},
{model: 'Insignia', make: 'Opel'},
{model: 'Astra', make: 'Opel'},
{model: 'Corsa', make: 'Opel'}
];
}
var uniqueItems = function (data, key) {
var result = new Array();
for (var i = 0; i < data.length; i++) {
var value = data[i][key];
if (result.indexOf(value) == -1) {
result.push(value);
}
}
return result;
};
myApp.filter('groupBy',
function () {
return function (collection, key) {
if (collection === null) return;
return uniqueItems(collection, key);
};
});
So as you can see the most important part is the creation of the filter groupBy. By creating this filter we can add it in the ng-repeat like this ng-repeat=”car in cars | filter:filterMakes()” and it checks each car in the json object.
Result
See it live here: http://jsfiddle.net/rzgWr/123/
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