Hi,
I have a few questions regarding previous sample in Add row to HTML Table with dependent DropDownList using AngularJS in ASP.Net MVC
1. Why every time i choose the quantity = 1 in the table it keep show the quantity is 0? 
2. I want to remove the table as in the image above using JavaScript but it didn't work 
            <div class="table" id="table_id">
                <table id="tblMaterials" class="table table-striped table-bordered" style="width:50%">
                    <thead>
                        <tr>
                            <th class="text-center">Material</th>
                            <th class="text-center">Quantity</th>
                            <th class="text-center"></th>
                        </tr>
                     </thead>
                     <tbody ng-repeat="m in Materials">
                        <tr>
                            <td class="text-center">{{m.Material}}</td>
                            <td class="text-center">{{m.Quantity}}</td>
                            <td class="text-center">Remove</td>
                        </tr>
                    </tbody>
                </table>
 
    <script>    
        var index, table = document.getElementById('table_id');
        for(var i = 1; i < table.rows.length; i++)
        {
            table.rows[i].cells[2].onclick = function () {
                var c = confirm("do you want to delete this row");
                if (c === true) {
                    index = this.parentElement.rowIndex;
                    table.deleteRow(index);
                }               
            };
        }
        </script>
3. In the dropdown, if i choose the material that have no quantity it should display alert message instead of adding the material in the table. How to do that? i made some changes in the code 
<script type="text/javascript">
    $(function () {
        $('#btnSave').on('click', function () {
            var material = {};
            material.req_name = $('#req_name').val();
            material.badge_num = $('#badge_num').val();
            material.line = $('#line').val();
            material.remark = $('#remark').val();
            var materials = new Array();
            $("#tblMaterials TBODY TR:has(td)").each(function () {
                var row = $(this);
                var material = {};
                material.MaterialName = row.find("TD").eq(0).html().trim();
                material.Quantity = row.find("TD").eq(1).html().trim();
                materials.push(material);
            });
            material.MaterialDetails = materials;
            //Send the JSON array to Controller using AJAX.
            $.ajax({
                type: "POST",
                url: '@Url.Action("AddDetail", "Home")',
                data: JSON.stringify(material),
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {
                   
                  }
            });
        });
    });
    var app = angular.module('MyApp', [])
    app.controller('MyController', function ($scope, $filter, $document) {
        $scope.Materials = [];
        $scope.materialValue = "0";
        $scope.quantity = "0";
        $scope.Add = function () {
            var material = {};
            if ($scope.material != "Select" && $scope.material != "") {
                material.Material = $scope.material;
                material.Quantity = $scope.quantity != undefined ? $scope.quantity : (alert("Material is not available!"));  /// I made this changes but nothing happen and it update the table
                var materialExist = $filter('filter')($scope.Materials, { Material: $scope.material }, true);
                if (materialExist.length > 0) {
                    for (var i = 0; i < $scope.Materials.length; i++) {
                        if ($scope.Materials[i].Material == $scope.material) {
                            if ($scope.quantity != undefined) {
                                $scope.Materials[i].Quantity = parseInt($scope.Materials[i].Quantity) + parseInt($scope.quantity);
                            }
                            break;
                        }
                    }
                } else {
                    $scope.Materials.push(material);
                }
            }
        };
        $scope.material = '';
        $scope.setMaterialName = function () {
            var ddl = angular.element(document.getElementById('ddlMaterial'));
            $scope.material = ddl[0].options[ddl[0].options.selectedIndex].text;
            var qty = ddl[0].value;
            var ddlddlQuantities = angular.element(document.getElementById('ddlQuantity'));
            ddlddlQuantities.empty();
            for (var i = 1; i <= qty; i++) {
                var option = document.createElement("OPTION");
                option.innerHTML = i;
                option.value = i;
                ddlddlQuantities[0].options.add(option);
            }
        };
    });
</script>