[英]Passing value from a service to a page in Ionic 2
I created a service with the following code.我使用以下代码创建了一个服务。 I wrote two functions one for creating the native storage with ip and port and the next one is for getting the values from the native storage.我写了两个函数,一个是用 ip 和 port 创建本机存储,另一个是从本机存储中获取值。
DatabaseService数据库服务
export class DatabaseService {
...
public ip: string;
public port: string;
...
public createConnectionInfo(ip: string, port: string) {
NativeStorage.setItem('connectionStorage', { ip: ip, port: port })
.then(
() => console.log('Stored Connection Information!'), //Working
error => console.error('Error storing connection information', error)
);
}
...
public getConnectionInfo() {
this.platform.ready().then(() => {
NativeStorage.getItem('connectionStorage').then(data => {
this.ip = data.ip; // I'm setting the ip in this public variable
this.port = data.port;
console.log(this.ip); //Works
}, error => {
this.navCtrl.push(SettingPage);
});
});
}
...
}
SettingPage设置页面
export class SettingPage {
connection: any;
service: DatabaseService;
ip: string;
port: string;
constructor(public navCtrl: NavController, platform: Platform, service: DatabaseService) {
this.service = service;
platform.ready().then(() => {
if(true){
console.log(this.service.ip+" IP FROM THE SERVICE"); \\I'm trying to get the ip from the service.
}
});
}
...
}
I was able to create the native storage and also retrieved the values from the native storage but i couldn't pass that from my service to the setting page.我能够创建本机存储并从本机存储中检索值,但我无法将其从我的服务传递到设置页面。 Please advise.请指教。 Thank you.谢谢你。 I'm still trying to get this solved.我仍在努力解决这个问题。 Please help.请帮忙。
My Ionic Info我的离子信息
Cordova CLI: 6.3.1
Gulp version: CLI version 3.9.1
Gulp local:
Ionic Framework Version: 2.0.0-rc.1
Ionic CLI Version: 2.1.0
Ionic App Lib Version: 2.1.0-beta.1
ios-deploy version: Not installed
ios-sim version: Not installed
OS: Mac OS X El Capitan
Node Version: v6.7.0
Xcode version: Xcode 7.3.1 Build version 7D1014
You could use the getConnectionInfo
method, to get your ip address if you tweak that method a bit to return a promise.如果您稍微调整该方法以返回承诺,您可以使用getConnectionInfo
方法来获取您的 IP 地址。 Something like this:像这样的东西:
public getConnectionInfo() {
return this.platform.ready().then(() => NativeStorage.getItem('connectionStorage'))
.then(data => {
this.ip = data.ip;
this.port = data.port;
console.log(this.ip);
return data;
}).catch(error => {
this.navCtrl.push(SettingPage);
return error;
});
});
}
Then on your SettingPage instead of accessing directly the value you would call the getConnectionInfo
, like this:然后在您的SettingPage 上,而不是直接访问您将调用getConnectionInfo
的值,如下所示:
export class SettingPage {
connection: any;
service: DatabaseService;
ip: string;
port: string;
constructor(public navCtrl: NavController, platform: Platform, service: DatabaseService) {
this.service = service;
platform.ready().then(() => this.service.getConnectionInfo())
.then(() =>{
if(true){
console.log(this.service.ip+" IP FROM THE SERVICE");
}
});
}
...
}
You might need to do some tweaking to this code, but it should work as it is.您可能需要对此代码进行一些调整,但它应该可以正常工作。
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