如何使用显示JSON对象* ngFor [英] How to display json object using *ngFor
问题描述
我想从火力地堡显示以下数据
I want to display the below data from Firebase
{
"-KBN9O_qqz-nZ9tPWFdM":{
"createdAt":1456399292790,
"isActive":true,
"name":"Hero 1"
},
"-KBN9gjJw1ZlMgt9pVsl":{
"createdAt":1456399371220,
"isActive":true,
"name":"Hero 2"
},
"-KBN9hYI4vYAsyh5k1lX":{
"createdAt":1456399374548,
"isActive":true,
"name":"Hero 3"
}
}
angular.io英雄之旅时教程例如:
<li *ngFor="#hero of heroes">
<span class="badge">{{hero.id}}</span> {{hero.name}}
</li>
所以英雄的ID应该显示例如 -KBN9hYI4vYAsyh5k1lX
和主人公的名字应显示例如英雄3
我已经做了一些研究,并通过@Thierry TEMPLIER的访问键和使用对象的值* ngFor
I have done some research and come across this stackoverflow solution by @Thierry Templier access key and value of object using *ngFor
(1)这是正确的解决我的问题?
(1) Is this the right solution to my problem?
(2)是否有一个更简单的解决这个问题,因为我觉得这将是非常普遍的使用Angular2显示这样的JSON数据的开发者。
(2) Is there a simpler solution to this problem because I feel that it would be really common for developers using Angular2 to display such json data.
推荐答案
您需要实现一个自定义的管道做到这一点。 ngFor
只支持数组,没有反对。
You need to implement a custom pipe to do this. ngFor
only supports array and not object.
这将管看起来像:
@Pipe({name: 'keys'})
export class KeysPipe implements PipeTransform {
transform(value, args:string[]) : any {
let keys = [];
for (let key in value) {
keys.push({key: key, value: value[key]);
}
return keys;
}
}
和使用这样的:
<span *ngFor="#entry of content | keys">
Key: {{entry.key}}, value: {{entry.value}}
</span>
有关详细信息,请参阅此问题:
See this question for more details:
- access键并使用* ngFor 对象的值
- access key and value of object using *ngFor
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