等同于来自 http 调用的变量

Question

我有一个 select 标签，其选项由 AngularJS 填充。我正在尝试 select 一个选项，如果它等于范围内的另一个 属性。我试图比较的选项值和范围 属性 都来自异步 http 调用。所以总是有延迟，然后它不能正常工作。确保两个范围 属性 都已解析并准备好进行比较的最佳做法是什么。

ng-selected="MusteriId == option.Value"是比较部分。

<select id="MusteriId" name="MusteriId" ng-model="MusteriId">
    <option ng-selected="MusteriId == option.Value"
            ng-repeat="option in MusteriList" value="{{option.Value}}">
      {{option.Text}}
    </option>
</select>

这是我的控制器，执行两个 http 调用。

(function() {
var biletController = function ($scope, $http, commonFunctions) {

    $scope.Id = null;
    $scope.BiletNo = null;
    $scope.BiletTarihi = null;
    $scope.CurrencyId = null;
    $scope.MusteriId = null;
    $scope.PAID_EUR = null;
    $scope.PAID_TL = null;
    $scope.PAID_USD = null;
    $scope.ServisIstiyorMu = null;
    $scope.TOTAL = null;
    $scope.TourId = null;

    $scope.MusteriList = null;

    $scope.openEditFormJS = function(e) {
        $http.get('/Bilet/Get/' + e)
            .then(function (response) {

                console.log(response.data);

                $scope.Id = response.data.Id;
                $scope.BiletNo = response.data.BiletNo;

                if (response.data.BiletTarihi) {
                    $scope.BiletTarihi = commonFunctions.formatDate(new Date(parseInt(response.data.BiletTarihi.substr(6))));
                }

                $scope.CurrencyId = response.data.CurrencyId;
                $scope.MusteriId = response.data.MusteriId;
                $scope.PAID_EUR = response.data.PAID_EUR;
                $scope.PAID_TL = response.data.PAID_TL;
                $scope.PAID_USD = response.data.PAID_USD;
                $scope.ServisIstiyorMu = response.data.ServisIstiyorMu;
                $scope.TOTAL = response.data.TOTAL;
                $scope.TourId = response.data.TourId;

                $('#modal').modal('show');

            });

        $http.get('/Bilet/GetMusteriSelectList')
            .then(function (response) {

                console.log(response.data);
                $scope.MusteriList = response.data;
            });
    };

};

app.controller('BiletController', ['$scope', '$http', 'commonFunctions', biletController]);
}());

Answer 1

对非字符串值使用 ng-value 指令¹

<select id="MusteriId" name="MusteriId" ng-model="MusteriId">
    <option ̶n̶g̶-̶s̶e̶l̶e̶c̶t̶e̶d̶=̶"̶M̶u̶s̶t̶e̶r̶i̶I̶d̶ ̶=̶=̶ ̶o̶p̶t̶i̶o̶n̶.̶V̶a̶l̶u̶e̶"̶
            ng-repeat="option in MusteriList" ng-value="option.Value">
      {{option.Text}}
    </option>
</select>

有关详细信息，请参阅 Using ngValue to bind the model to an array of objects

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不要将 ngSelected 与 ngModel

一起使用

<select id="MusteriId" name="MusteriId" ng-model="MusteriId">
    <option ̶n̶g̶-̶s̶e̶l̶e̶c̶t̶e̶d̶=̶"̶M̶u̶s̶t̶e̶r̶i̶I̶d̶ ̶=̶=̶ ̶o̶p̶t̶i̶o̶n̶.̶V̶a̶l̶u̶e̶"̶
            ng-repeat="option in MusteriList" value="{{option.Value}}">
      {{option.Text}}
    </option>
</select>

来自文档：

Note: ngSelected does not interact with the <select> and ngModel directives, it only sets the selected attribute on the element. If you are using ngModel on the select, you should not use ngSelected on the options, as ngModel will set the select value and selected options.

— AngularJS ng-selected API Reference

查看其他文档：

• Using ng-repeat to generate select options
• Using select with ng-options and setting a default value

参见 Whosebug：

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