使用angular2读取JSON
我对json\object有问题,我试图从中提取数据,但失败了 我有一个API,我从中提取数据: 我已将其放置在变量使用angular2读取JSON,json,angular,Json,Angular,我对json\object有问题,我试图从中提取数据,但失败了 我有一个API,我从中提取数据: 我已将其放置在变量results上, 如果我想获得对象参数date、base、rate,如下所示: calc(details) { let results = [this.networkServices.getCurrency(details)]; // object is here "getCurrency deal with the GET request. alert(res
results
上,
如果我想获得对象参数date、base、rate,如下所示:
calc(details) {
let results = [this.networkServices.getCurrency(details)]; // object is here "getCurrency deal with the GET request.
alert(results.base);
}
我得到了错误代码:
[02:58:36] transpile update started ...
[02:58:38] typescript: D:/ionic/firstApp/src/pages/currency/currency.ts, line: 19
Property 'base' does not exist on type 'Promise<any>[]'.
L18: let results = [this.networkServices.getCurrency(details)];
L19: alert(results.base);
[02:58:38] transpile update failed
服务请求是异步的,因此请求的结果是解析为对象的承诺,而不是对象本身。试着这样做:
this.networkServices.getCurrency(details).then(result => alert(result))
尝试更新您的
getCurrency()
,删除then()
,以返回承诺:
那么@pe8ter的解决方案应该有效:
this.networkServices.getCurrency(详细信息)。然后(结果=>alert(结果))
请使用网络服务中的getCurrency()方法进行更新这与Angular有什么关系?这与JSON有什么关系?
this.networkServices.getCurrency(details).then(result => alert(result))
getCurrency(obj){
console.log("function fired!")
let url = `http://api.fixer.io/latest?base=${obj.selectedCurrency}`;
return this.http.get(url).toPromise();
}