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我一直在尝试在 Angular 中构建在线购物车/商店，但在让人们能够选择他们想要的每件商品的数量方面遇到了困难。
ng-options 有效，并且使用 ng-model 正确设置了默认值。它是在 ng-repeat 中。但由于某种原因，我第一次选择 <select> 中的任何选项每<select>选项(默认)被删除。为什么会出现这种行为？我做了一个简单的事情，所以你可以明白我的意思。
<强> http://plnkr.co/edit/6CM0frKnhuzvfu52H9GZ?p=preview
代码
HTML:
<body id="page-top" class="is-loading" ng-controller="bCtrl">
<div class="form-group" ng-repeat="(key, value) in breads | groupBy: 'Type'">
<label class="itemTitle">{{key}}</label>
<div ng-repeat="bread in value">
<label for="exampleInputPassword1">{{bread.Name}}</label>
<select name="@{{bread.Name}} quantity" ng-options="quantity as quantityOption.value for quantityOption in quantityOptions track by quantityOption.value" ng-model="selection.selected"></select>
<p class="price">{{bread.Price|currency}} {{bread.details}}</p>
</div>
</div>
</body>
JavaScript:
var app = angular.module('fook', ['angular.filter']);
app.controller('bCtrl', ['$scope',function($scope) {
$scope.breads = [{"id":19,"Name":"Apple Pie","Type":"Pies","Picture":"","Price":"3.95","PriceWholesale":"23.95","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":20,"Name":"Old Fashioned Pumpkin Pie","Type":"Pies","Picture":"","Price":"14.95","PriceWholesale":"14.95","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":21,"Name":"Peasant White Rolls","Type":"Rolls","Picture":"","Price":"4.95","PriceWholesale":"4.95","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"per 1\/2 dozen.","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":22,"Name":"Honey Whole Wheat Rolls","Type":"Rolls","Picture":"","Price":"4.95","PriceWholesale":"4.95","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"per 1\/2 dozen.","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":23,"Name":"Corn Rolls","Type":"Rolls","Picture":"","Price":"4.95","PriceWholesale":"4.95","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"per 1\/2 dozen.","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":24,"Name":"Cranberry Orange Rolls","Type":"Rolls","Picture":"","Price":"4.95","PriceWholesale":"4.95","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"per 1\/2 dozen.","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":25,"Name":"Cranberry Orange Roll Wreath","Type":"Roll Wreaths","Picture":"","Price":"20","PriceWholesale":"20","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":26,"Name":"Peasant White Roll Wreath","Type":"Roll Wreaths","Picture":"","Price":"18","PriceWholesale":"18","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"},{"id":27,"Name":"Honey Whole Wheat Roll Wreath","Type":"Roll Wreaths","Picture":"","Price":"18","PriceWholesale":"18","DaysNotAvailable":"","TwoBuisnessDays":"True","canShip":"False","minAmount":0,"details":"","weight":"","holiday":"Thanksgiving","quantity":0,"created_at":"-0001-11-30 00:00:00","updated_at":"-0001-11-30 00:00:00"}]
$scope.selection={};
$scope.quantityOptions = [
{ value: 0 },
{ value: 1 },
{ value: 2 },
{ value: 3 },
{ value: 4 },
{ value: 5 },
{ value: 6 },
{ value: 7 },
{ value: 8 },
{ value: 9 },
{ value: 10 }
];
$scope.selection.selected=$scope.quantityOptions[0];
}]);
最佳答案
您的代码很好，在您的情况下使用跟踪依据和对象ng-model是正确的，只需将ng-options中的数量更改为quantityOption :
ng-options="quantityOption as quantityOption.value for quantityOption in quantityOptions track by quantityOption.value"
否则，selection.selected将被分配数量变量，这是未定义的
关于javascript - Angular JS - 选择由 Ng-Repeat 内的 Ng-Options 生成的选项，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40323872/
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