我是 AngularJS 新手。我查了很多资料,还是没有解决我的问题。
我第一次在选择框中得到一个空白选项。
这是我的 HTML 代码
<div ng-app="MyApp1">
<div ng-controller="MyController">
<input type="text" ng-model="feed.name" placeholder="Name" />
<select ng-model="feed.config">
<option ng-repeat="template in configs">{{template.name}}</option>
</select>
</div>
</div>
JS
var MyApp=angular.module('MyApp1',[])
MyApp.controller('MyController', function($scope) {
$scope.feed = {};
//Configuration
$scope.configs = [
{'name': 'Config 1',
'value': 'config1'},
{'name': 'Config 2',
'value': 'config2'},
{'name': 'Config 3',
'value': 'config3'}
];
//Setting first option as selected in configuration select
$scope.feed.config = $scope.configs[0].value;
});
但是好像不行。 我怎样才能解决这个问题?这是JSFiddle Demo
最佳答案
供引用:Why does angularjs include an empty option in select ?
The empty
option
is generated when a value referenced byng-model
doesn't exist in a set of options passed tong-options
. This happens to prevent accidental model selection: AngularJS can see that the initial model is either undefined or not in the set of options and don't want to decide model value on its own.In short: the empty option means that no valid model is selected (by valid I mean: from the set of options). You need to select a valid model value to get rid of this empty option.
像这样更改你的代码
var MyApp=angular.module('MyApp1',[])
MyApp.controller('MyController', function($scope) {
$scope.feed = {};
//Configuration
$scope.feed.configs = [
{'name': 'Config 1',
'value': 'config1'},
{'name': 'Config 2',
'value': 'config2'},
{'name': 'Config 3',
'value': 'config3'}
];
//Setting first option as selected in configuration select
$scope.feed.config = $scope.feed.configs[0].value;
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div ng-app="MyApp1">
<div ng-controller="MyController">
<input type="text" ng-model="feed.name" placeholder="Name" />
<!-- <select ng-model="feed.config">
<option ng-repeat="template in configs">{{template.name}}</option>
</select> -->
<select ng-model="feed.config" ng-options="template.value as template.name for template in feed.configs">
</select>
</div>
</div>
更新(2015 年 12 月 31 日)
如果您不想设置默认值并希望删除空白选项,
<select ng-model="feed.config" ng-options="template.value as template.name for template in feed.configs">
<option value="" selected="selected">Choose</option>
</select>
并且在JS中不需要初始化值。
$scope.feed.config = $scope.feed.configs[0].value;
关于angularjs - 使用 AngularJS 从选择选项中删除空白选项,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20738953/