我刚开始使用Ionic框架。到现在为止,我已经一起走了。我的问题是,一个数组在运行时被忽略,我不知道为什么。 我很难过。我认为,对于这个问题,最好先发布我的代码。Array在运行时莫名其妙地被取消
export interface Days
{
name:string;
}
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage
{
days = [] as Days[];
constructor(public navCtrl: NavController, public alertCtrl: AlertController, public navParams: NavParams)
{
}
presentDayDialog(): void
{
let alert = this.alertCtrl.create({
title: 'Add new day',
message: 'Enter a name for the new day',
inputs: [
{
name: 'day',
placeholder: 'Day'
},
],
buttons: [
{
text: 'Cancel',
handler:() => {
console.log('Cancel clicked');
}
},
{
text: 'Save',
handler: data => {
this.addDays(data.day);
}
}
]
});
alert.present();
}
addDays(rname): void
{
this.days.push({name: rname});
}
itemTapped(Days)
{
this.navCtrl.push(RoutinePage, {
pageName: Days.name
});
console.log("The page name was "+Days.name);
}
}
export interface Routine
{
name:string;
weight: number;
reps: number;
}
@Component({
selector: 'page-routine',
templateUrl: 'routine.html'
})
export class RoutinePage
{
routines = [] as Routine[];
public pageName;
constructor(public navCtrl: NavController, public toastCtrl: ToastController, public alertCtrl: AlertController, public platform: Platform, public storage: Storage, public navParams: NavParams)
{
console.log('PRE CONSTRUCTOR ' + this.routines);
this.pageName = navParams.get("pageName");
this.getRoutines();
console.log('POST CONSTRUCTOR ' + this.routines);
}
//Sets the routines to storage
setRoutines()
{
console.log('ROUTINES ARRAY before setRoutine() '+ this.routines);
this.storage.set(this.pageName, this.routines);
console.log('ROUTINES ARRAY after setRoutine() '+ this.routines);
}
//Gets the routines from storage, this gets executed at the construction of this page so it isn't empty at the start
getRoutines()
{
console.log('ROUTINES ARRAY before getRoutine() '+ this.routines);
this.routines = [{name: 'Nigger', weight: 0, reps: 0}];
this.storage.get(this.pageName).then((data) => {
this.routines = data;
});
console.log('ROUTINES ARRAY after getRoutine() '+ this.routines);
}
//Adds a new routine and saves it to storage
addRoutine(rname): void
{
console.log('ROUTINES ARRAY before addRoutine() '+ this.routines);
this.routines.push({name: rname, weight: 0, reps: 0});
console.log('ROUTINES ARRAY after addRoutine() ' + this.routines);
this.setRoutines();
}
//Presents the dialog for adding a new routine on FAB-button-press, calls addRoutine function
presentRoutineDialog(): void
{
let alert = this.alertCtrl.create({
title: 'Add new routine',
message: 'Enter a name for the new routine',
inputs: [
{
name: 'routine',
placeholder: 'Routine'
},
],
buttons: [
{
text: 'Cancel',
handler:() => {
console.log('Cancel clicked');
}
},
{
text: 'Save',
handler: data => {
console.log('ROUTINES ARRAY AFTER SAVE BUTTON PRESS:' +this.routines);
this.addRoutine(data.routine);
}
}
]
});
console.log('ARRAY BEFORE ALERT: ' + this.routines);
alert.present();
console.log('ARRAY AFTER ALERT: ' + this.routines);
}
}
所以,这就是我想这应该工作。我将项目(天)添加到“第一个”页面上的列表中。当我点击该项目时,我打开第二页并传递“日”的名称,然后成为第二页的名称。我也使用这个名称作为key-name来将这个数组存储在存储中。因此,每个页面都有自己的存储空间,页面中充满了构建信息。
问题: 在运行时,例程数组莫名其妙地被忽略,除非我点击的第一页的日期名称为空。这可以和我的hacky感觉存储系统有点关系,但我无法想象究竟是什么罪魁祸首。 这些都是控制台日志,我发现还挺有意思:
The page name was Upper Body home.ts:63:4
PRE CONSTRUCTOR routine.ts:28:4
ROUTINES ARRAY before getRoutine() routine.ts:46:4
ROUTINES ARRAY after getRoutine() [object Object] routine.ts:51:4
POST CONSTRUCTOR [object Object] routine.ts:32:4
ARRAY BEFORE ALERT: null routine.ts:91:4
ARRAY AFTER ALERT: null routine.ts:93:4
ROUTINES ARRAY AFTER SAVE BUTTON PRESS:null routine.ts:85:12
ROUTINES ARRAY before addRoutine() null
所以,后立即构造器“已完成”,该阵列是突然空。这是为什么?我没有看到什么?我诚实地在这里结束了我的智慧,我希望有人能够帮助。
这里'data'的值是什么:'this.routines = data;'? – robbannn
我怀疑@robbannn是否正确指出了问题的根源。我会添加一行'console.log('POST CONSTRUCTOR'+ this.routines);'当你认为它没有运行时运行。具体来说,它不会在'getRoutines'完成后显示'this.routines'的值,而是显示值之前的值,因为该函数是异步的 –
可能的重复[如何从Observable/http/async调用返回响应在angular2?](https://stackoverflow.com/questions/43055706/how-do-i-return-the-response-from-an-observable-http-async-call-in-angular2) – Alex