var app = angular.module('app', ['dndLists']);
app.controller('homeCtrl', function ($scope) {
    $scope.html_string = "<div class='container'><div class='row'><div class='col-xs-12'><div class='row'><div class='col-xs-4 grid-cell'></div><div class='col-xs-4 grid-cell'></div><div class='col-xs-4 grid-cell'></div></div><div class='row'><div class='col-xs-4 grid-cell'></div><div class='col-xs-4 grid-cell'></div><div class='col-xs-4 grid-cell'></div></div></div></div></div>";

    $scope.page_elements = [{
        "grid_id": 0,
            "position": 0,
            "snippet": "<h4>First Grid 0</h4>",
        "template": "snippet"
    }, {
        "grid_id": 0,
            "position": 1,
            "snippet": "<h2>Second Grid 0</h2>",
        "template": "snippet"
    }, {
        "grid_id": 1,
            "position": 0,
            "snippet": "<h2>First Grid 1</h2>",
        "template": "snippet"
    }, {
        "grid_id": 1,
            "position": 1,
            "snippet": "<h2>Second Grid 1</h2>",
        "template": "snippet"
    }, {
        "grid_id": 2,
            "position": 0,
            "snippet": "<h1>First Grid 2</h1>",
        "template": "snippet"
    }, {
        "grid_id": 2,
            "position": 1,
            "snippet": "<h2>Second Grid 0</h2>",
        "template": "snippet"
    }, {
        "grid_id": 2,
            "position": 2,
            "snippet": "<h2>Third Grid 0</h2>",
        "template": "snippet"
    }, {
        "grid_id": 5,
            "position": 0,
            "snippet": "<h2>Before Last</h2>",
        "template": "snippet"
    }, {
        "grid_id": 5,
            "position": 1,
            "snippet": "<h2>Last</h2>",
        "template": "snippet"
    }];
    $scope.page_elements_pretty = angular.toJson($scope.page_elements, true);
    $scope.rmElement = function (i) {
        debugger
    };
})
    .directive('grid', function ($compile) {
    return {
        restrict: 'E',
        replace: true,
        scope: {
            html_string: '=htmlstring',
            page_elements: '=pageelements'
        },
        link: function (scope, element, attrs) {
            scope.$watch('html_string', function (html) {
                element.html(html);

                var grid_cell = element.find('.grid-cell');
                for (var celli = 0; celli < grid_cell.length; ++celli) {
                    var cell_eli = '';
                    for (var eli = 0; eli < scope.page_elements.length; ++eli) {
                        if (scope.page_elements[eli].grid_id === celli) {
                            cell_eli += scope.page_elements.indexOf(scope.page_elements[eli]);
                        }
                    }
                    var cell_html = '<div class="layout-grid"><div class="drop-area"><div dnd-list="page_elements">';
                    cell_html += '<div ng-repeat="item in page_elements | cell_elements:\'' + cell_eli + '\'" dnd-draggable="item" dnd-moved="page_elements[page_elements.indexOf(item)].pop()" ng-click="page_elements[page_elements.indexOf(item)] = {}" ng-include="item.template + \'.html\'" dnd-effect-allowed="move"></div>';
                    cell_html += '</div></div></div>';

                    $(grid_cell[celli]).empty().append(cell_html);
                }
                $compile(element.contents())(scope);
            });
        }
    };
}).filter('cell_elements', function () {
    return function (page_elements, cell_eli_str) {
        var cell_elms = cell_eli_str.split('').map(Number);
        var matched = [];
        for (var i = 0; i < page_elements.length; ++i) {
            for (var j = 0; j < cell_elms.length; ++j) {
                if (i === cell_elms[j]) {
                    matched.push(page_elements[i]);
                }
            }
        }
        return matched;
    }
});

.item {
  min-height: 50px;
  padding-left: 0px;
}

.drop-layout .layout-grid {
  margin-bottom: 15px;
}

.drop-layout .layout-grid [class^=col-] {
  background-color: #eee;
  background-color: rgba(86, 61, 124, .15);
  border: 1px solid #ddd;
  border: 1px solid rgba(86, 61, 124, .2);
}

.drop-layout div[dnd-list], .drop-layout div[dnd-list] > div {
  position: relative;
}

.drop-layout .drop-area div[dnd-list] {
  min-height: 50px;
  padding-left: 0px;
}

.drop-layout .drop-area div {
  background-color: #eee;
  border: 1px solid #ddd;
  display: block;
  padding: 0px;
}

.drop-layout .drop-area .dndDragging {
  opacity: 0.7;
}

.drop-layout .drop-area .dndDraggingSource {
  display: none;
}

.drop-layout .drop-area .dndPlaceholder {
  background-color: #ddd;
  background-color: rgba(86, 61, 124, .2);
  min-height: 48px;
  display: block;
  position: relative;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://rawgit.com/marceljuenemann/angular-drag-and-drop-lists/master/angular-drag-and-drop-lists.min.js"></script>

<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
<div ng-app="app">
  <div ng-controller="homeCtrl" class="drop-layout">
    <h1>Grid:</h1>
    <grid htmlstring="html_string" pageelements="page_elements"></grid>
    
    <script type="text/ng-template" id="snippet.html">
      <div class="item">{{item.snippet}} {{item.position}}</div>
    </script>
    <h1>Compile dynamic HTML</h1><h5>How to live preview of filled by elements html?</h5>
    <textarea ng-model="html_string" rows="5" cols="100"></textarea>
    <p>Assign elements to .grid-cells: <pre>{{page_elements}}</pre></p>
  </div>
</div>