我在使用Ionic 2和設置全局變量時遇到了一些困難。我的應用程序的結構如下:全局變量Ionic 2
Main app
|
|--- Page1 (Info)
|--- Page2 (Map)
|--- Page3 (List)
|
|--- ItemTabsPage
|
|---tab1
|---tab2
|---tab3
我的目的是在顯示列表頁第三頁,一旦一個項目被選中,以顯示選項卡的附加信息。
我送從第3頁的信息頁面使用的標籤:
itemTapped(event, item) {
this.nav.push(ItemTabsPage, {
item: item
});
}
的問題是,我不能做同樣的送信息到子選項卡。我想根據選擇的項目顯示不同的信息。我試圖限定注射globalVars.js到存儲在變量中的值:
import {Injectable} from 'angular2/core';
@Injectable()
export class GlobalVars {
constructor(myGlobalVar) {
this.myGlobalVar = "";
}
setMyGlobalVar(value) {
this.myGlobalVar = value;
}
getMyGlobalVar() {
return this.myGlobalVar;
}
}
,然後更新itemTapped的代碼列表中,如下所示:
itemTapped(event, item) {
this.nav.push(ItemTabsPage, {
item: item
});
this.globalVars.setMyGlobalVar(item);
}
然而,我總是得到同樣的錯誤:
Uncaught EXCEPTION: Error during evaluation of "click"
ORIGINAL EXCEPTION: TypeError: Cannot read property 'setMyGlobalVar' of undefined
爲第3頁的代碼是:
import {Page, NavController, NavParams} from 'ionic-angular';
import {ItemService} from '../services/ItemService';
import {ItemTabsPage} from '../item/item-tabs/item-tabs';
import {GlobalVars, setMyGlobalVar} from '../../providers/globalVars';
import {Http} from 'angular2/http';
import 'rxjs/add/operator/map';
@Page({
templateUrl: 'build/pages/item-list/item-list.html',
providers: [ItemService]
})
export class ItemListPage {
static get parameters() {
return [[NavController], [NavParams], [Http]];
}
constructor(nav, navParams, http, globalVars) {
this.nav = nav;
// If we navigated to this page, we will have an item available as a nav param
this.selectedItem = navParams.get('item');
this.http = http;
//this.items = null;
this.globalVars = globalVars;
this.http.get('https://website-serving-the-info.com/items.json').map(res => res.json()).subscribe(data => {
this.items = data.items;
},
err => {
console.log("Oops!");
});
}
itemTapped(event, item) {
this.nav.push(ItemTabsPage, {
item: item
});
this.globalVars.setMyGlobalVar(item);
}
}
任何人有任何建議嗎?我離子安裝:
Cordova CLI: 6.1.1
Gulp version: CLI version 3.9.1
Gulp local: Local version 3.9.1
Ionic Framework Version: 2.0.0-beta.4
Ionic CLI Version: 2.0.0-beta.25
Ionic App Lib Version: 2.0.0-beta.15
OS: Distributor ID: LinuxMint Description: Linux Mint 17.3 Rosa
Node Version: v5.11.0
感謝您的回答,但是當我添加[GlobalVars]應用程序變成空白,它不起作用... –
我上傳代碼到https://github.com/realjumy/menuPlusTabs,因爲仍然有一些失敗但我不知道我做錯了什麼。 –