Question

我在控制器中有这样的功能

this.getStates = function () {
                LoadingService.enableLoading();
                CartService.getStates(self.customerDetails.Country).then(function (response) {
                    response = response.data;
                    self.states = response.State;
                    LoadingService.disableLoading();
                }).catch(function (response) {
                    console.log(response);
                    LoadingService.disableLoading();
                });
            };

在我看来它以这种方式呈现

这是模板代码

<select required id='country' class="form-control" ng-model="checkoutCntrl.customerDetails.Country" ng-init="checkoutCntrl.customerDetails.Country = checkoutCntrl.countries[107]"
                ng-options="item.CountryCode as item.CountryName for item in checkoutCntrl.countries track by item.CountryCode"
                ng-select="checkoutCntrl.getStates()" ng-change="checkoutCntrl.getStates()">
        </select>

我想选择默认国家/地区，如何选择它。我在使用ng-init中的函数时，在从服务器获取数据之前调用它

此处是设置国家/地区值以尝试获取状态后的下一个代码

this.getStates = function () {
                console.log('obj=====>');
                console.log(self.customerDetails.Country.CountryCode);
                LoadingService.enableLoading();
                CartService.getStates(self.customerDetails.Country).then(function (response) {
                    response = response.data;
                    self.states = response.State;
                    LoadingService.disableLoading();
                }).catch(function (response) {
                    console.log(response);
                    LoadingService.disableLoading();
                });
            };

其中self.customerDetails.Country将作为对象出现

Answer 1

ng-init仅对表达式求值一次。在您的情况下，由于您的请求是异步的，因此在您的请求成功时，已经评估了ng-init。初始化变量的更好方法是在成功回调

中写入此内容

checkoutCntrl.customerDetails.Country = checkoutCntrl.countries[107];

如果您不希望在请求之前显示您的选择，请考虑使用ng-if仅在满足条件时呈现指令。例如

<div ng-if="showMeOnSuccessfulRequest" >Content...</div>

CartService.getStates(self.customerDetails.Country).then(function (response) {
                response = response.data;
                self.states = response.State;
                $scope.showMeOnSuccessfulRequest = true;
                LoadingService.disableLoading();
            }).catch(function (response) {
                console.log(response);
                LoadingService.disableLoading();
            });

在API响应之前调用ng-init

1 个答案: