javascript - how to filter the data by obj's attribute in ng-repeat angularjs -

im beginning student on angularjs

suppose have josn obj

 [ {         "title": "a",         "date": "2015-05-31",         "a": "11",         "b": 22,     },      {         "title": "b",         "date": "2015-05-11",        "a": "33",         "b": 44,     },     {         "title": "c",         "date": "2015-04-11",        "a": "55",         "b": 66,     },     {         "title": "d",         "date": "2015-03-03",        "a": "11",         "b": 22,     } ] 

ngrepeat

<li ng-repeat="obj in objs">{{obj.date  | date:"mm/yyyy"}}</li> 

we have 2 data in may (05-31 ,05-11)in json obj,and want keep 1 data in month, keep second one.

how write fliter i'm confused

you need create filter , use inside ng-repeat. syntax create filters this:

angular   .module('mymodule')   .filter('myfilter', function myfilter(service1, service2) { //to ask deps      return function(input) { //here real filtering         return dosomethingwithinput(input);      }   }) 

to apply logic filtering ask for, can create filter this:

angular   .module('mymodule')   .filter('oncepermonth', oncepermonth);  function oncepermonth() {   return function (data) {     var filtered = [], months = [];     data.foreach(function(item){       var month = item.date.substr(0,7);       if (~~months.indexof(month)){         months.push(month);         filtered.push(item);       }     });     return filtered;   } } 

with filter, html template this:

<li ng-repeat="obj in vm.objs | oncepermonth">    {{obj.date | date:"mm/yyyy"}} {{obj.title}} </li> 

you can find working plnkr here: http://plnkr.co/edit/sg0wwpuue0cjwozj2kus?p=preview