Javascript ng repeat指令中的角度选择:如何访问子作用域?
我有一个Javascript ng repeat指令中的角度选择:如何访问子作用域?,javascript,angularjs,angularjs-scope,angularjs-ng-repeat,angularjs-select2,Javascript,Angularjs,Angularjs Scope,Angularjs Ng Repeat,Angularjs Select2,我有一个ng repeat-ed表格行,里面有一对角度selects: <div ng-controller="midiCtrl" id="midi-ctrl"> [...] <tr ng-repeat="plugin in plugins"> <td><strong>{{plugin.name}}</strong></td>
ng repeat
-ed表格行,里面有一对角度select
s:
<div ng-controller="midiCtrl" id="midi-ctrl">
[...]
<tr ng-repeat="plugin in plugins">
<td><strong>{{plugin.name}}</strong></td>
<td>
<select class="span1" ng-model="selectedChannel" ng-options="item.ID as item.Title for item in channels">
</td>
<td>
<select class="span2" ng-model="selectedDevice" ng-options="item.ID as item.Title for item in devices">
</td>
</tr>
[...]
</div>
现在,我知道当选择其中一个选项时,相应的对象在ng模型范围变量($scope.selectedChannel
或$scope.selectedDevice
)上设置,但显然它在相应的ng重复子范围中设置
如何访问控制器中的子作用域?我想在用户按下按钮时保存所有选择,但如果我尝试在
midctrl
控制器中保存,我无法访问由ng repeat
创建的子作用域。您可以先在父控制器中定义所选对象。数据绑定的对象中应该始终“有点”,以避免原型继承的问题,因此应该绑定到“selected.channel”之类的对象,而不是“selectedChannel”
并相应地更新HTML
<div ng-controller="midiCtrl" id="midi-ctrl">
[...]
<tr ng-repeat="plugin in plugins">
<td><strong>{{plugin.name}}</strong></td>
<td>
<select class="span1" ng-model="selected.channel" ng-options="item.ID as item.Title for item in channels">
</td>
<td>
<select class="span2" ng-model="selected.device" ng-options="item.ID as item.Title for item in devices">
</td>
</tr>
[...]
</div>
[...]
{{plugin.name}}
[...]
最简单的技巧是将选定的值添加到当前的插件
对象中,这样您就可以轻松获得选定的值,并且这些值自然地绑定到正确的插件
对象。不会引入其他对象。很简单
<select class="span1" ng-model="plugin.selectedChannel" ng-options="item.ID as item.Title for item in channels">
<select class="span2" ng-model="plugin.selectedDevice" ng-options="item.ID as item.Title for item in devices">
如果你想分开存放,你可以这样做
<select class="span1" ng-model="selected[$index].selectedChannel" ng-options="item.ID as item.Title for item in channels" />
<select class="span2" ng-model="selected[$index].selectedDevice" ng-options="item.ID as item.Title for item in devices" />
$scope.selected = [];
angular.forEach($scope.plugins, function (a) {
$scope.selected.push({
selectedChannel: undefined,
selectedDevice: undefined
});
})
$scope.selected=[];
angular.forEach($scope.plugins,函数(a){
$scope.selected.push({
selectedChannel:未定义,
所选设备:未定义
});
})
真是太棒了。它之所以有效,是因为子对象继承了父作用域,不是吗?@janesconference以及当前的
插件
对象都是通过引用跟踪的。因此,像从子范围向其添加新属性这样的更改将被保留。出于好奇,如果我想使用另一个对象而不“污染”插件对象呢?哇。我不知道我可以访问模型中的索引。谢谢,非常有启发性。这不起作用。当一个选择被设置时,另一个也被设置。
<select class="span1" ng-model="plugin.selectedChannel" ng-options="item.ID as item.Title for item in channels">
<select class="span2" ng-model="plugin.selectedDevice" ng-options="item.ID as item.Title for item in devices">
<select class="span1" ng-model="selected[$index].selectedChannel" ng-options="item.ID as item.Title for item in channels" />
<select class="span2" ng-model="selected[$index].selectedDevice" ng-options="item.ID as item.Title for item in devices" />
$scope.selected = [];
angular.forEach($scope.plugins, function (a) {
$scope.selected.push({
selectedChannel: undefined,
selectedDevice: undefined
});
})