Check All checkbox function inside a modal

If user clicks 'add data' a modal opens, I have individual checkboxes for data1,data2,data3,data4. I also have a check all checkbox. If user clicks this, it should be able to select all above 4, if clicks again, it should deselect all. Also, once selected, the value of 'Select All' should change to 'Deselect All'

Code:

<div ng-controller="ModalDemoCtrl">
    <script type="text/ng-template" id="myModalContent.html">

        <div class="modal-body">
            <label><input type="checkbox" ng-model="checkboxModel.value1"> Data1</label><br/>
            <label><input type="checkbox" ng-model="checkboxModel.value2"> Data2</label><br/>
            <label><input type="checkbox" ng-model="checkboxModel.value3"> Data3</label><br/>
            <label><input type="checkbox" ng-model="checkboxModel.value4"> Data4</label><br/>
            <label><input type="checkbox" ng-model="checkboxModel.value5">Select All</label><br/>
        </div>
        <div class="modal-footer">
            <button class="btn btn-primary" type="button" ng-click="ok()">OK</button>
            <button class="btn btn-warning" type="button" ng-click="cancel()">Cancel</button>
        </div>
    </script>

    <button type="button" class="btn btn-default" ng-click="open()">Add data</button>
</div>

Can someone let me know how to achieve this. I saw a lot of posts online but each had ng-repeat for the first 4 checkboxes. Mine is without using ng-repeat. Can someone please advise.

I have the following plunker: http://ift.tt/29XZH1E