Bookmarking article in ionic app - angularjs

Question

How to bookmark article in ionic app
<div class="container" on-tap="toggleHeader()" >
<!-- on-tap="toggleHeader()" -->
<div id="test" class="slideItem" ng-class="{'list list-inset-hide': Aindex > $index + 1, 'back-items': Aindex < $index+1}" ng-repeat="Listnews in AllnewsList" ng-style="{'height':'{{hgt}}','z-index': (AllnewsList.length - $index)}" on-swipe-up="swipeUp($event)" on-swipe-down="swipeDown($event)">
<div ng-class="{'satin': Aindex < $index+1, 'not-satin': Aindex != $index}" >
</div>
<ul class="list-unstyled cs-tag-item-grp newsDiv">
<li class="clearfix">
<div class="newsCnt">
<div ng-show="Listnews.ImageUrl !=' ' " class="newsImageContainer">
<img class="newsImage" ng-src="{{Listnews.ImageUrl}}"/>
</div>
<div class="newTitle pLR5">{{Listnews.Heading}}</div>
<div class="newsDisc pLR5">{{Listnews.Para | limitTo: 300}} {{Listnews.Para.length > 300 ? '…':''}}</div>
<div class="newsEdit pLR5"><strong>Starticle</strong> by - {{Listnews.Editor}} / {{Listnews.PublishedDate | date:'dd MMM'}} </div>
<div class="newSrc pLR5" ng-show="Listnews.SourceLink" >more at - <a ng-href="{{Listnews.SourceLink}}" onclick="window.cordova.InAppBrowser.open(this.href, '_blank', 'location=yes'); return false;">{{Listnews.SourceName}}</a>
</div>
<div class="tabs tabs-icon-only" >
<a class="tab-item" >
<a class="button icon ion-share" ng-click="shareAnywhere(Listnews.ImageUrl,Listnews.Heading,Listnews.Para,Listnews.SourceLink)"></a>
</a>
<a class="tab-item">
<a ng-show="!bookmarkstate" class="button icon ion-ios-bookmarks-outline" ng-click="bookmark(true)"></a>
<a ng-show="bookmarkstate" class="button icon ion-ios-bookmarks" ng-click="bookmark(false)"></a>
</a>
<a class="tab-item">
<a class="button icon ion-chatbox-working" ng-click="commentModalopen()"></a>
</a>
</div>
</div>
</li>
</ul>
</div>
</div>
</div>
bookmark function
$scope.bookmark = function(state)
{
$scope.info = null;
if(!localStorage.getItem("localnews")){
var book_data = {data: []};
var notID = 0 ;
window.localStorage.setItem("book_data", JSON.stringify(book_data));
window.localStorage.setItem("id", JSON.stringify(notID));
}
$scope.info = JSON.parse(window.localStorage.getItem("book_data"));
$scope.bookmarkstate = state
var page = document.getElementById("localnews").value;
if(page == null)
{
alert("Bookmark Not added");
return;
}
var id = JSON.parse(window.localStorage.getItem("book_data"));
var array = {id:id};
$scope.info.data[$scope.info.data.length] = array;
window.localStorage.setItem("rp_data", JSON.stringify($scope.info));
window.localStorage.setItem("id", JSON.stringify(id + 1));
alert("Bookmark Added")
document.getElementById("Aindex").value =" ";
$scope.getBookmarked();
}