绑定所选项目angularjs

Question

我无法在控制器中使用override func didMoveToView(view: SKView) { let bkg = UIImage(named: "Background") let backgroundCGImage = bkg!.CGImage //change the string to your image name let coverageSize = self.size //the size of the entire image you want tiled let textureSize = CGRectMake(0, 0, bkg!.size.width, bkg!.size.height); //the size of the tile. UIGraphicsBeginImageContextWithOptions(coverageSize, false, UIScreen.mainScreen().scale); let context = UIGraphicsGetCurrentContext() CGContextDrawTiledImage(context, textureSize, backgroundCGImage) let tiledBackground = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() let backgroundTexture = SKTexture(image: tiledBackground) let backgroundTiles = SKSpriteNode(texture: backgroundTexture) backgroundTiles.yScale = -1 //upon closer inspection, I noticed my source tile was flipped vertically, so this just flipped it back. backgroundTiles.position = CGPointMake(self.size.width/2, self.size.height/2) self.addChild(backgroundTiles) } 进行以下代码中的某些计算：

selectedItem1

使用以下控制器：

  <div class="col-md-3">
          <label>Vendere:</label> 
          <select ng-model="selectedItem1" ng-options="(rosa.nome+' '+rosa.costo) for rosa in rose"></select>

   </div>

我明白为什么？哪里我错了？

Answer 1

我想你需要给selectedItem1初始值。看看下面的例子会对你有帮助： -

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var app = angular.module('App', []);

app.controller('Ctrl', function($scope, $http) {  
  $scope.rose = [{
    'nome': "abc",
    'costo':110
  }, {
    nome: "xyz",
    costo: 10
  }];

  $scope.selectedItem1 =  $scope.rose[0];// default selected item
  
  $scope.budget0 = 60;
  $scope.budget1 = $scope.budget0 - $scope.selectedItem1.costo;
  
  $scope.change = function(){
    $scope.budget1 = $scope.budget0 - $scope.selectedItem1.costo;
    console.log($scope.selectedItem1);  
    console.log($scope.budget0 +"-"+ $scope.selectedItem1.costo +"="+$scope.budget1);  
  }
  
});

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<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="App" ng-controller="Ctrl">

  <select ng-model="selectedItem1" ng-change="change()"
          ng-options="(rosa.nome+' '+rosa.costo) for rosa in rose"></select>

  <br/>
  {{"budget1 == "+budget1}}
</div>

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