[英]Resolve Http Request on Angular2 before executing code
我在執行其他代碼之前嘗試解析http.post請求時遇到問題。
這是地方:
getRefresh(token){
debugger;
console.log("sono dentro get refresh");
console.log(token);
let params = new URLSearchParams();
params.append('grant_type','refresh_token');
params.append('refresh_token',token);
params.append('client_id','web_app');
let headers = new Headers({'Content-type': 'application/x-www-form-urlencoded; charset=utf-8','Authorization': 'Basic '+btoa("web_app:")});
let options = new RequestOptions({headers: headers});
this._http.post('http://localhost:9997/oauth/token',params.toString(),options)
.map(res => res.json())
.subscribe(
data => this.saveToken(data),
err => alert('Invalid Credentials')
);
}
通過瀏覽器控制台進行控制流之后,我注意到saveToken方法沒有盡快執行。
事實是,我需要該方法來注冊一些cookie,在此重復使用:
if (!Cookie.get("access_token")) {
this.getRefresh(Cookie.get("refresh_token"));
cookie = Cookie.get("access_token");
} else {
cookie = Cookie.get("access_token");
}
var headers = new Headers({
'Content-type': 'application/x-www-form-urlencoded; charset=utf-8',
'Authorization': 'Bearer ' + cookie
});
var options = new RequestOptions({headers: headers});
return this._http.get(resourceUrl, options)
.map((res: Response) => res.text())
.catch((error: any) => Observable.throw(error().json().error || 'Server error'));
如何解決可觀察的異步問題?
更改您的getRefresh(token)
方法以返回可觀察到的值,並在調用代碼中使用它:
function getRefresh(token) {
debugger;
console.log("sono dentro get refresh");
console.log(token);
let params = new URLSearchParams();
params.append('grant_type', 'refresh_token');
params.append('refresh_token', token);
params.append('client_id', 'web_app');
let headers = new Headers({ 'Content-type': 'application/x-www-form-urlencoded; charset=utf-8', 'Authorization': 'Basic ' + btoa("web_app:") });
let options = new RequestOptions({ headers: headers });
return this._http.post('http://localhost:9997/oauth/token', params.toString(), options)
.map(res => res.json())
.flatMap(
data => this.saveToken(data),
err => alert('Invalid Credentials')
);
}
function getResource() {
var cookie = Cookie.get("access_token");
var headers = new Headers({
'Content-type': 'application/x-www-form-urlencoded; charset=utf-8',
'Authorization': 'Bearer ' + cookie
});
var options = new RequestOptions({ headers: headers });
return this._http.get(resourceUrl, options)
.map((res: Response) => res.text())
.catch((error: any) => Observable.throw(error().json().error || 'Server error'));
}
function callingCodeFunction() {
if (!Cookie.get("access_token")) {
this.getRefresh(Cookie.get("refresh_token"))
.flatMap((result) => {
getResource();
});
} else {
getResource()
}
}
*我尚未運行此代碼-可能會出現錯誤,但它應該有助於證明原理。
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