AngularJS ng-options 最初从一个选择值

Question

我有一个带有属性的对象：值结构应该用于 ng-options 以创建 select 下拉列表。我还有一个 ng-model 变量，其中包含属性当前应该 selected。问题是我不知道如何修复初始 selection。你可以在这里找到代码

<select ng-model="selectedCar" ng-options="id as value for (id, value) in cars track by id">

http://jsbin.com/wukanenozu/1/edit?html,js,output

Answer 1

不使用"track by"

Do not use as and track by in the same expression. They are not designed to work together.

<select ng-model="selectedCar" ng-options="id as value for (id, value) in cars ">
</select>

演示版

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.cars = {
        frd : "Ford",
        ft1 : "Fiat",
        vlv : "Volvo"
    }
    $scope.selectedCar = 'ft1';
});

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>

<div ng-app="myApp" ng-controller="myCtrl">

<p>Select a car:</p>

<select ng-model="selectedCar" ng-options="id as value for (id, value) in cars ">
</select>
<h1>You selected model: {{selectedCar}}</h1>

</div>

<p>This example demonstrates the use of an object as the data source when creating a dropdown list.</p>



</body>
</html>

AngularJS ng-options 最初从一个选择值

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