我有一个AngularJS应用。我正在尝试学习在Angular中做事的正确方法,并更好地了解框架。考虑到这一点,我有一个类似于以下内容的应用程序:

index.html

<!DOCTYPE html>
<html ng-app>
<head>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js"></script>
    <script src="myControllers.js"></script>

    <style type="text/css">
        .init { border: solid 1px black; background-color: white; color: black; }

        .red { background-color:red; color:white; border:none; }
        .white { background-color: white; color: black; border:none; }
        .blue { background-color:blue; color:white; border:none; }
    </style>
</head>

<body ng-controller="StripeListCtrl">
    <select ng-options="stripe.id as stripe.name for stripe in stripes" ng-model="selectedStripe">
        <option value="">Select a Stripe Color</option>
    </select>

    <div ng-class="{{getStripeCss()}}">
        You chose {{selectedStripe.name}}
    </div>
</body>
</html>


mycontrollers.js

function StripeListCtrl($scope) {
    $scope.selectedStripe = null;
    $scope.stripes = [
      { name: "Red", id=2, css: 'red' },
      { name: "White", id: 1, css: 'white' },
      { name: "Blue", id: 5, css: 'blue' }
    ];

    $scope.getStripeCss = function() {
        if ($scope.selectedStripe == null) {
            return "init";
        }
        return $scope.selectedStripe.css;
    }
}


我试图弄清楚当用户在下拉菜单中选择一个选项时如何动态更改DIV元素样式。此时,将触发getStripeCss函数。但是,selectedStripe是条纹的ID。来自XAML背景,我习惯使用整个对象。虽然我知道我可以编写一个实用程序方法,该方法遍历条带对象并找到具有相应ID的对象,但这对于这种任务来说似乎相当手动。

是否有比我提到的编写实用程序方法更好的方法?如果是这样,怎么办?

谢谢!

最佳答案

您根本不需要getStripeCss中的功能$scope

如果要变量selectedStripe存储对象,则需要更改ng-options,如下所示:

<select ng-options="stripe.name for stripe in stripes" ng-model="selectedStripe">
    <option value="">Select a Stripe Color</option>
</select>

<div ng-class="{red:selectedStripe.id==2, white:selectedStripe.id==1,
blue:selectedStripe.id==5}">
    You chose {{selectedStripe.name}}
</div>


但是,如果您希望selectedStripe存储键(例如您当前正在执行的操作)并且希望访问stripes数组/对象中的项而不循环它们,则可以执行以下操作:

<select ng-options="key as value.name for (key,value) in stripes"
ng-model="selectedStripe">
    <option value="">Select a Stripe Color</option>
</select>

<div ng-class="{red:selectedStripe==2, white:selectedStripe==1,
blue:selectedStripe==5}">
    You chose {{stripes[selectedStripe].name}}
</div>


更改型号:

$scope.stripes = {
    2:{ name: "Red", id:2, css: 'red' },
    1:{ name: "White", id: 1, css: 'white' },
    5:{ name: "Blue", id: 5, css: 'blue' }
};

10-07 21:58