javascript - AngularJS - parse JSON -

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i have list of photographs being generated following snippet. render table structure, each photo being cell in table. id of each photo example 1d means photo in first row of table , in 4th/d column.

<ul>    <li class="row">       <ul>             <li class="photo" id="photo-1a">1a</li>             <li class="photo" id="photo-1b">1b</li>             <li class="photo" id="photo-1c">1c</li>             <li class="photo" id="photo-1d">1d</li>             <li class="photo" id="photo-2a">2a</li>             <li class="photo" id="photo-2b">2b</li>             <li class="photo" id="photo-2c">2c</li>             <li class="photo" id="photo-2d">2d</li>             <li class="photo" id="photo-3a">3a</li>             <li class="photo" id="photo-3b">3b</li>             <li class="photo" id="photo-3c">3c</li>             <li class="photo" id="photo-3d">3d</li>       </ul>    </li> </ul>

i have json includes whether photo available or not. json string along these lines:

[{"row":1,"position":"a","available":true},{"row":1,"position":"b","available":false},{"row":1,"position":"c","available":false},{"row":1,"position":"d","available":false},{"row":2,"position":"a","available":true},{"row":2,"position":"b","available":false},{"row":2,"position":"c","available":false},{"row":2,"position":"d","available":false},{"row":3,"position":"a","available":true},{"row":3,"position":"b","available":false},{"row":3,"position":"c","available":false},{"row":3,"position":"d","available":false}]

now need parse json string , when of these photos have "available:true" in json string, add class photo-available in html. new angular , not sure if there easy way assign class available photos. glad if can tell me use or how it.

edit: angular code this:

<ul class="table-rows">     <li class="photo-row" ng:repeat="photo in photos" ng:class="'photo-' + photo.row + photo.position">         <ul class="table-photos">             <li class="photo photo-available" ng:class="selectedornot(photo)" ng:init="photo.selected = false" ng:click="photo.selected = !photo.selected">           <div class="photo-number">{{photo.row + photo.position}}</div>                                   </li>                                         </ul>                                   </li>   <div class="clear"></div>

update3
reason unable restore previous selections overwriting photo's selected property ng-init:

ng:init="photo.selected = false" ng-class="{'selected': photo.selected, 'available': photo.available}"

when combine these two, 'selected' class never added because photo.selected has been hardcoded false. need remove ng-init, , previous selection trigger ng-class add correct class.

here working demo: http://plnkr.co/tvdhrilaffcn55h6mogu

original answer
if list of photos not same array list of available photos, can use directive add class. 

app.directive('availablephoto', function($filter) {   return {     restrict: 'a',     scope: true,     link: function(scope, element, attr) {       var id = attr.id        var regex = /photo-(.)(.)/g;       var match = regex.exec(id);        var row = match[1]       var position = match[2]        var photo = $filter('filter')(scope.photos, {row:row, position:position}, false)        console.log(photo);        if (photo[0].available) {         element.addclass('available');       }     }   } });

then attach each list item this:

<li class="photo" id="photo-1a" available-photo>1a</li>

here demo: http://plnkr.co/wjcmlf2m39fcunvopyna

update1

based on update, see there 1 array populating list, , contains available flag. therefore, don't need custom directive - ngclass work. here integrated code sample:

<ul class="table-rows">   <li class="photo-row" ng:repeat="photo in photos" ng:class="'photo-' + photo.row + photo.position">     <ul class="table-photos">       <li class="photo" ng-class="{'available': photo.available}" ng:init="photo.selected = false" ng:click="photo.selected = !photo.selected">         <div class="photo-number">{{photo.row + photo.position}}         </div>                                 </li>                                        </ul>   </li>   <div class="clear"></div>   </ul>

i have update plunker demonstrate this.
http://plnkr.co/wjcmlf2m39fcunvopyna

update2
since need ngclass add multiple classes, use this: 

ng-class="{'selected': photo.selected, 'available': photo.available}"

demonstration of selected + available: http://plnkr.co/wjcmlf2m39fcunvopyna


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