我有要运行的功能。问题在于它不等待两个调用完成并实例化rule1
和rule2
,所以我得到了rule1.optionhead is undefined
的错误。我试图将代码嵌套到每个subscribe
上,但是创建执行的次数比我想要的多。我该怎么解决?
为了澄清,
我使用此for循环是因为selectedScenario
是ID数组,其输入形式为ngValue
saveFunction() {
for (const pair of this.selectedScenario) {
this.ruleToSave = null;
this.ruleService.find(pair[0]).subscribe((ruleResponse: HttpResponse < Rule > ) => {
this.rule1 = ruleResponse.body;
});
this.ruleService.find(pair[1]).subscribe((ruleResponse: HttpResponse < Rule > ) => {
this.rule2 = ruleResponse.body;
});
const head1 = this.rule1.optionHead;
const head2 = this.rule2.optionHead;
if (
this.selectedOption === head1 &&
this.selectedOption !== head2 &&
(this.selectedWeakerOption === '' || head2 === this.selectedWeakerOption)
) {
..some code
this.subscribeToSaveResponse(this.ruleService.createRule(this.ruleToSave));
}
}
}
答案 0 :(得分:1)
尝试ForkJoin
Observable.forkJoin([
this.ruleService.find(pair[0]),
this.ruleService.find(pair[1])])
.subscribe(
(result: any[]) =>{
this.rule1 = result[0];
this.rule1 = result[1];
..Your code
}
);
答案 1 :(得分:-2)
您应该为此使用该代码
removeAll() {
Promise.all([
this.storage.remove(key1),
this.storage.remove(key2),
this.storage.remove(key3),
]).then(value => doSomething());