问题描述

1. datatables 框架和 Angularjs 的 ng-repeat 指令一起使用的时候会出现数据无法在表格中展现的错误，点击下表格的 head ，数据就会消失。在 datatables 的官网也有人问过这个问题 is-there-a-way-to-use-ng-repeat-and-datatables。

   错误如图：

   

2. ng-repeat 需要的数据需要从 ajax 请求异步获取，导致表格比数据先渲染出来，然后无法把表格中的数据导出到 excel

3. $scope.$on 调用多次的问题

解决办法：

1. 使用 angular-datatables 框架解决

2. 使用 angular 的 directive 和 $timeout 方式解决。

3. $scope.$on 调用多次需要使用 destroy 的方式解决

总体代码如下：

表格部分的代码

<table id="main" class="table table-bordered" datatable="ng">
                    <thead>
                    <tr>
                        <th>a</th>
                        <th>b</th>
                        <th>c</th>
                        <th>d</th>
                        <th>e</th>
                    </tr>
                    </thead>
                    <tbody>
                    <tr ng-repeat="item in items track by $index" ng-model="items" on-finish-render="ngRepeatFinished">
                        <td>{{item.a}}</td>
                        <td>{{item.b}}</td>
                        <td>{{item.c}}</td>
                        <td>{{item.d}}</td>
                        <td>{{item.e}}</td>
                    </tr>
                    </tbody>
                </table>

JS 代码：

<script type="text/javascript">
    var myapp = angular.module("main", ['datatables']);


    myapp.directive('onFinishRender', function ($timeout) {
        return {
            restrict: 'A',
            link: function (scope, element, attr) {
                if (scope.$last) {
                    $timeout(function () {
                        scope.$emit(attr.onFinishRender);
                    });
                }
            }
        }
    });


    myapp.controller("mainCtrl", ['$scope', '$http', function ($scope, $http) {
        $scope.trv = {orders: ""};
        $scope.errMsg = "";
        $scope.isDisabled = false;
        $scope.items = {};

        //调用之后销毁,避免调用两次
        var destroyFoo = $scope.$on('ngRepeatFinished', function() {
            $("table").tableExport();
        });


        $scope.$on('ngRepeatFinished', function() {
            destroyFoo();
            console.log("test");
        });

        $scope.test= function () {
            if ($scope.trv.orders== '')
            {
                alert("数据不能为空!");
                return;
            }
            $scope.isDisabled = true;


            var bArray = $('#orders').val().replace(/\s+/g, ",");
            var cArray = bArray.split(",");
            var dUnique = $.unique(cArray);
            console.log(dUnique);

            var estr = $.map(dUnique, function (val, index) {
                var str = val;
                return str;
            }).join(",");
            console.log(estr);
            var data = {items: estr};
            var url = "/a/b.json";
            console.log(data);
            $http({
                method: "POST",
                dataType: "json",
                contentType: 'application/json',
                url: url,
                data: data,
            }).success(function (data) {
                if (data.success) {
                    $scope.errMsg = "";
                    $scope.items = $.parseJSON('[' + formatData(data.data) + ']');
                    alert("查询完成");
                } else {
                    $scope.errMsg = data.message;
                    console.log("有问题的数据:" + data.data);
                    $scope.items = data.data;
                    $scope.isDisabled = false;
                }
            }).error(function (data) {
                alert(data);
                $scope.isDisabled = false;
            });
        };

        function formatData(data) {
            var lastData = [];
            var pObj = {'a': "", 'b': "", 'c': "", 'd': "", 'e': ""};
            Object.keys(data).forEach(function (k) {
                data[k].forEach(function (element) {
                    var vm = JSON.stringify(element);
                    pObj.a = k;
                    pObj.b = element.b;
                    pObj.c = element.c;
                    pObj.d = element.d;
                    pObj.e = element.e;
                    lastData.push(JSON.stringify(pObj));
                });
            });
            return lastData;

        }




    }]);
</script>