Question

我的控制器中有下拉数据。

 $scope.groups={{"gpId": 3, "name" :"Tom"}, {"gpId": 32, "name" :"Helen"},{"gpId": 9, "name" :"Amy"}

 $scope.user=
 {
   tkId: 32;
   place: NW
  }

在我的html中，我有以下选择

   <select ng-model="user.tkId" ng-options="a.gpId as a.name for a in groups track by a.gpId></select>

当我跑步时，我会选择Helen，但是当我想从下拉菜单中更改选择时，它不会让我失望。请让我知道如何更改它以选择其他选项，以便我可以在需要时保存。谢谢

Answer 1

以下代码段有效。

首先，像$('.btn').each(initDraggable); function initDraggable() { var param = {} param.drag = drag param.stop = stopper param.start = startOsc $(this).draggable(param) } var Variables = {} Variables.Frequency = 0 function drag(myEvent, myUI) { var Frequency = myUI.position.left + 100 var Duration = 5000 if (Math.abs(Variables.Frequency - Frequency) > 25) { //You could put some validation on creation, but since you're not creating it, it's not necessary here /*if (typeof(Variables.osc) === 'undefined') { } else { Variables.osc.stop(0) }*/ Variables.Frequency = Frequency; //Oscillator(Frequency,Duration) Variables.osc.frequency.value = Frequency; } } function startOsc(myEvent, myUI) { var Frequency = myUI.position.left + 100 Oscillator(Frequency) //Since it plays in continue you don't need duration } function stopper() { Variables.osc.stop(0) } Variables.ctx = new(window.AudioContext || window.webkitAudioContext) function Oscillator(argFrequency /*,argDuration*/ ) { Variables.osc = Variables.ctx.createOscillator() Variables.osc.type = 0 Variables.osc.connect(Variables.ctx.destination) Variables.osc.frequency.value = argFrequency Variables.osc.start(0) /*setTimeout(myTimeout,argDuration) function myTimeout() { Variables.osc.stop(0) }*/ }

这样编写一个对象数组

It's written in the angular docs <link rel="stylesheet" href="//cdn.jsdelivr.net/bootstrap/latest/css/bootstrap.css"> <link rel="stylesheet" href="//cdn.jsdelivr.net/jquery.ui/latest/jquery-ui.min.css"> <span class="btn btn-primary">Drag me</span> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="//cdn.jsdelivr.net/bootstrap/latest/js/bootstrap.js"></script> <script src="//cdn.jsdelivr.net/jquery.ui/latest/jquery-ui.min.js"></script> <script src="//cdn.jsdelivr.net/jquery.ui.touch-punch/latest/jquery.ui.touch-punch.js"></script>和[{}, {}]不应该一起使用。

请勿在同一表达式中使用track by和as。它们并非旨在协同工作。

select as

通过Id Angularjs下拉选择轨道

1 个答案: