我想检查一个数组,直到它填满并显示一个加载对话框,但它总是告诉我
this.events [0]未定义
ngOnInit() {
this.initMethod();
if(this.events[0].start == this.books[0].date_from_og) {
this.dialog.closeAll();
}
}
但是事件不能不确定,因为它包含显示的日历事件。
initMethod() {
this.service
.getEmployees()
.subscribe(
(listBooks) => {
this.books = listBooks;
this.events = this.books.map((book) => {
return {
start: new Date(book.date_from_og),
end: new Date(book.date_to_og),
type: ""+book.type,
title: "" + book.device + "",
color: colors.blue,
actions: this.actions,
resizable: {
beforeStart: false,
afterEnd: false
},
draggable: false
}
});
},
(err) => console.log(err)
);
}
}
和构造函数:
constructor(private modal: NgbModal, private service: BookingService, private dialog: MatDialog) {
this.initMethod();
this.dialog.open(DialogLaedt, {
width: '650px'
});
答案 0 :(得分:0)
您的问题是您initMethod()
异步检索结果。
因此,当您到达if(this.events[0].start == ...
行时,就不能保证已经从服务中检索到了事件数据。
解决方法是将您的支票移到init方法的subscribe部分中(该方法在observable发出值时立即执行),或者让init方法返回可以订阅的observable,然后在其中执行检查该订阅。
ngOnInit() {
this.initMethod();
}
initMethod() {
this.service
.getEmployees()
.subscribe(
(listBooks) => {
this.books = listBooks;
this.events = this.books.map((book) => {
return {
start: new Date(book.date_from_og),
end: new Date(book.date_to_og),
type: ""+book.type,
title: "" + book.device + "",
color: colors.blue,
actions: this.actions,
resizable: {
beforeStart: false,
afterEnd: false
},
draggable: false
}
if(this.events[0].start == this.books[0].date_from_og) {
this.dialog.closeAll();
}
});
},
(err) => console.log(err)
);
}
ngOnInit() {
this.initMethod().subscribe(() => {
if(this.events[0].start == this.books[0].date_from_og) {
this.dialog.closeAll();
}
});
}
initMethod() {
return this.service
.getEmployees()
.pipe(tap(
(listBooks) => {
this.books = listBooks;
this.events = this.books.map((book) => {
return {
start: new Date(book.date_from_og),
end: new Date(book.date_to_og),
type: ""+book.type,
title: "" + book.device + "",
color: colors.blue,
actions: this.actions,
resizable: {
beforeStart: false,
afterEnd: false
},
draggable: false
}
});
}))
}
答案 1 :(得分:0)
我注意到您两次调用 initMethod()。一次在构造函数中,一次在 ngOninit 方法中。