角度js下拉默认值答案

【问题标题】：angular js dropdown default value角度js下拉默认值
【发布时间】：2020-07-30 03:44:06
【问题描述】：

那么在以下脚本中，我们如何将“CAR1”设置为下拉列表的默认值？非常感谢提前

</script>
<body>

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

<p>Select a car:</p>

<select ng-model="selectedCar" ng-options="x for (x, y) in cars">
</select>

<h1>You selected: {{selectedCar.brand}}</h1>
<h2>Model: {{selectedCar.model}}</h2>
<h3>Color: {{selectedCar.color}}</h3>

<p>Note that the selected value represents an object.</p>
</div>

<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.cars = {
        car01 : {brand : "Ford", model : "Mustang", color : "red"},
        car02 : {brand : "Fiat", model : "500", color : "white"},
        car03 : {brand : "Volvo", model : "XC90", color : "black"}
    }
});
</script>

&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.9/angular.min.js"&gt;&lt;/script&gt;

【问题讨论】：

标签： javascript android html angularjs

【解决方案1】：

<select ng-init="selectedCar = cars.car01" ng-model="selectedCar" ng-options="x for (x, y) in cars">
</select>

使用ng-init并将默认值赋给ng-model变量selectedCar

【讨论】：

【解决方案2】：

在分配选项后设置您的默认值。像这样设置默认值$scope.selectedCar = $scope.cars.car01;。我也更新了代码。

</script>
<body>

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

<p>Select a car:</p>

<select ng-model="selectedCar" ng-options="x for (x, y) in cars">
</select> 
 

<h1>You selected: {{selectedCar.brand}}</h1>
<h2>Model: {{selectedCar.model}}</h2>
<h3>Color: {{selectedCar.color}}</h3>

<p>Note that the selected value represents an object.</p>
</div>

<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.cars = {
        car01 : {brand : "Ford", model : "Mustang", color : "red"},
        car02 : {brand : "Fiat", model : "500", color : "white"},
        car03 : {brand : "Volvo", model : "XC90", color : "black"}
    }
    
    $scope.selectedCar = $scope.cars.car01; // set here
});
</script>

&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.9/angular.min.js"&gt;&lt;/script&gt;

【讨论】：