任何人都可以解释ngoptions [英] can anyone explain ngoptions

问题描述

任何人都可以解释这段代码：

鉴于$ scope上的这一系列项目：



$ scope.items = [{

id：1，

label：'aLabel'，

subItem：{name：' aSubItem'}

}，{

id：2，

label：'bLabel'，

subItem： {name：'bSubItem'}

}];



< select ng-options =item as item.label for item in项目按项目跟踪.idng-model =selected>< / select>



在ng-options中我们指定了

item as item.label for item in item by item.id任何人都可以解释这句话

Hi,
can anyone explain this code:
Given this array of items on the $scope:

$scope.items = [{
id: 1,
label: 'aLabel',
subItem: { name: 'aSubItem' }
}, {
id: 2,
label: 'bLabel',
subItem: { name: 'bSubItem' }
}];

<select ng-options="item as item.label for item in items track by item.id" ng-model="selected"></select>

In ng-options we have specified
"item as item.label for item in items track by item.id" can anyone explain this statement

推荐答案

范围：

scope:

scope.items = [{

id：1，

label：'aLabel'，

subItem：{name：'aSubItem'}

}，{

id：2，

label：'bLabel' ，

subItem：{name：'b SubItem'}

}];



< select ng-options =item as item.label for item in item by item .idng-model =selected>< / select>



在ng-options中我们指定了

item as item.label for item in item by item.id任何人都可以解释这个陈述

scope.items = [{
id: 1,
label: 'aLabel',
subItem: { name: 'aSubItem' }
}, {
id: 2,
label: 'bLabel',
subItem: { name: 'bSubItem' }
}];

<select ng-options="item as item.label for item in items track by item.id" ng-model="selected"></select>

In ng-options we have specified
"item as item.label for item in items track by item.id" can anyone explain this statement

我不知道Angular但是我猜它会解析为类似的东西：

I don't know Angular but I would guess it parses out to something like:

Select the item.label from the items array where the selected value matches the item.id

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