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[英]Angular 2: How to call a function after get a response from subscribe http.post
[英]How to call function after you get data back from .subscribe() in Angular 5
我似乎找不到有效的答案。 我有一個可觀察的訂閱對象,例如:
this.contentfulService.weekNumber
.subscribe(
(weekNumber) => { this.weekNumber = weekNumber; }
);
我想在接收到數據並將其放入變量this.weekNumber
我嘗試這樣做:
this.contentfulService.weekNumber
.subscribe(
(weekNumber) => { weekNumber = this.weekNumber; },
(error) => { console.log(error); },
() => { console.log(this.weekNumber); }
);
但我沒有得到console.log
嗎? 我僅使用console.log作為測試,實際上我想使用this.weekNumber
的數據來填充某些內容,但是當我將它放在weekNumber = this.weekNumber
之后時,我weekNumber = this.weekNumber
確定了,所以我需要能夠定義this.weekNumber
之后調用一個函數
任何幫助,將不勝感激。
您沒有以正確的方式分配值。 請檢查本教程。
更改代碼,如下所示:
this.contentfulService.weekNumber
.subscribe(
(weekNumber) => {
this.weekNumber = weekNumber;
console.log(this.weekNumber);
},
(error) => { console.log(error); });
我認為您的訂閱必須是這樣的:
this.contentfulService.weekNumber
.subscribe(
weekNumber => {
this.weekNumber = weekNumber;
console.log(this.weekNumber); }, error => { console.log(error); });
現在您將無法獲得this.weekNumber是未定義的,因為您將在函數內部擁有此范圍
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