How to filter (key, value) with ng-repeat in Angul

问题:

I am trying to do something like :

<div ng-controller=\"TestCtrl\">
    <div ng-repeat=\"(k,v) in items | filter:hasSecurityId\">
        {{k}} {{v.pos}}
    </div>
</div>

AngularJs Part:

function TestCtrl($scope) 
{
    $scope.items = {
                     \'A2F0C7\':{\'secId\':\'12345\', \'pos\':\'a20\'},
                     \'C8B3D1\':{\'pos\':\'b10\'}
                   };

    $scope.hasSecurityId = function(k,v)
    {
       return v.hasOwnProperty(\'secId\');
    }
}

But somehow, it is showing me all items. How can I filter on (key,value) ?

回答1:

Angular filters can only be applied to arrays and not objects, from angular\'s API -

\"Selects a subset of items from array and returns it as a new array.\"

You have two options here:
1) move $scope.items to an array or -
2) pre-filter the ng-repeat items, like this:

<div ng-repeat=\"(k,v) in filterSecId(items)\">
    {{k}} {{v.pos}}
</div>

And on the Controller:

$scope.filterSecId = function(items) {
    var result = {};
    angular.forEach(items, function(value, key) {
        if (!value.hasOwnProperty(\'secId\')) {
            result[key] = value;
        }
    });
    return result;
}

jsfiddle: http://jsfiddle.net/bmleite/WA2BE/

回答2:

My solution would be create custom filter and use it:

app.filter(\'with\', function() {
  return function(items, field) {
        var result = {};
        angular.forEach(items, function(value, key) {
            if (!value.hasOwnProperty(field)) {
                result[key] = value;
            }
        });
        return result;
    };
});

And in html:

 <div ng-repeat=\"(k,v) in items | with:\'secId\'\">
        {{k}} {{v.pos}}
 </div>

回答3:

Also you can use ng-repeat with ng-if:

<div ng-repeat=\"(key, value) in order\" ng-if=\"value > 0\">

回答4:

Or simply use

ng-show=\"v.hasOwnProperty(\'secId\')\"

See updated solution here:

http://jsfiddle.net/RFontana/WA2BE/93/

回答5:

You can simply use angular.filter module, and then you can filter even by nested properties.
see: jsbin
2 Examples:

JS:

angular.module(\'app\', [\'angular.filter\'])
  .controller(\'MainCtrl\', function($scope) {
  //your example data
  $scope.items = { 
    \'A2F0C7\':{ secId:\'12345\', pos:\'a20\' },
    \'C8B3D1\':{ pos:\'b10\' }
  };
  //more advantage example
  $scope.nestedItems = { 
    \'A2F0C7\':{
      details: { secId:\'12345\', pos:\'a20\' }
    },
    \'C8B3D1\':{
      details: { pos:\'a20\' }
    },
    \'F5B3R1\': { secId:\'12345\', pos:\'a20\' }
  };
});

HTML:

  <b>Example1:</b>
  <p ng-repeat=\"item in items | toArray: true | pick: \'secId\'\">
    {{ item.$key }}, {{ item }}
  </p>

  <b>Example2:</b>
  <p ng-repeat=\"item in nestedItems | toArray: true | pick: \'secId || details.secId\' \">
    {{ item.$key }}, {{ item }}
  </p> 

回答6:

It is kind of late, but I looked for e similar filter and ended using something like this:

<div ng-controller=\"TestCtrl\">
 <div ng-repeat=\"(k,v) in items | filter:{secId: \'!!\'}\">
   {{k}} {{v.pos}}
 </div>
</div>

回答7:

I made a bit more of a generic filter that I\'ve used in multiple projects already:

• object = the object that needs to be filtered
• field = the field within that object that we\'ll filter on
• filter = the value of the filter that needs to match the field

HTML:

<input ng-model=\"customerNameFilter\" />
<div ng-repeat=\"(key, value) in filter(customers, \'customerName\', customerNameFilter\" >
   <p>Number: {{value.customerNo}}</p>
   <p>Name: {{value.customerName}}</p>
</div>

JS:

  $scope.filter = function(object, field, filter) {
    if (!object) return {};
    if (!filter) return object;

    var filteredObject = {};
    Object.keys(object).forEach(function(key) {
      if (object[key][field] === filter) {
        filteredObject[key] = object[key];
      }
    });

    return filteredObject;
  };

回答8:

Although this question is rather old, I\'d like to share my solution for angular 1 developers. The point is to just reuse the original angular filter, but transparently passing any objects as an array.

app.filter(\'objectFilter\', function ($filter) {
    return function (items, searchToken) {
        // use the original input
        var subject = items;

        if (typeof(items) == \'object\' && !Array.isArray(items)) {
            // or use a wrapper array, if we have an object
            subject = [];

            for (var i in items) {
                subject.push(items[i]);
            }
        }

        // finally, apply the original angular filter
        return $filter(\'filter\')(subject, searchToken);
    }
});

use it like this:

<div>
    <input ng-model=\"search\" />
</div>
<div ng-repeat=\"item in test | objectFilter : search\">
    {{item | json}}
</div>

here is a plunker