Question

当设备没有摄像头时，我想在Ionic2上发出警报。

当我发布时：离子服务

然后我尝试显示如下消息：

 let alert = Alert.create({
                title: 'Camera not found',
                subTitle: 'It seems your camera is not working on your device',
                buttons: ['Ok']
            });
            this.nav.present(alert);

我有一个javascript错误

Uncaught EXCEPTION: Error during evaluation of "click"
ORIGINAL EXCEPTION: TypeError: rootNav.getActive is not a function
ORIGINAL STACKTRACE:
TypeError: rootNav.getActive is not a function
    at Tab.NavController.present (http://localhost:8100/build/js/app.bundle.js:46996:36)
    at SmartScan.takePicture (http://localhost:8100/build/js/app.bundle.js:60864:23)
    at AbstractChangeDetector.ChangeDetector_SmartScan_0.handleEventInternal (eval at <anonymous> (http://localhost:8100/build/js/app.bundle.js:14578:17), <anonymous>:185:36)
    at AbstractChangeDetector.handleEvent (http://localhost:8100/build/js/app.bundle.js:13892:25)
    at AppView.dispatchEvent (http://localhost:8100/build/js/app.bundle.js:18772:46)
    at AppView.dispatchRenderEvent (http://localhost:8100/build/js/app.bundle.js:18766:22)
    at DefaultRenderView.dispatchRenderEvent (http://localhost:8100/build/js/app.bundle.js:33592:39)
    at eventDispatcher (http://localhost:8100/build/js/app.bundle.js:33258:22)
    at http://localhost:8100/build/js/app.bundle.js:33329:40

Answer 1

在alert.js中：

   Set objFSO = CreateObject("Scripting.FileSystemObject")

If WScript.Arguments.Count < 1 Then
WScript.Quit
End If
  objStartFolder = objFSO.GetAbsolutePathName(WScript.Arguments(0))
  Set objFolder = objFSO.GetFolder(objStartFolder)
  Set colFiles = objFolder.Files

For Each objFile in colFiles
strFileName = objFile.Name
If objFSO.GetExtensionName(strFileName) = "xml" Then
            objFSO.CopyFile objFile.Name, "TMP.xml", True
            Set objExcel = CreateObject("Excel.Application")
            Set xlBook = objExcel.Workbooks.Open("c:/Users/xyz/Desktop/vbs/xyz.xlsm", 0, False)
            objExcel.Run "importxml", objStartFolder & "/TMP.xml",  objStartFolder & "/out.xml"
            xlBook.Close (False)
            objExcel.Quit
            Set xlBook = Nothing
            Set objExcel = Nothing
            objFSO.CopyFile "out.xml", objFile.Name & "_out.xml", True
 End If
  Next
objFSO.DeleteFile "TMP.xml", True   
objFSO.DeleteFile "out.xml", True 
WScript.Quit

在alert.html中：

import {Page, Alert, NavController} from 'ionic-angular';

@Page({
templateUrl: 'build/pages/alert/alert.html'
})

export class AlertPage {
    static get parameters() {
        return [[NavController]];
    }
    constructor(nav) {
        this.nav = nav;
    }

    showAlert() {
        let alert = Alert.create({
            title: 'New Friend!',
            subTitle: 'Your friend, Obi wan Kenobi, just accepted your friend request!',
            buttons: ['Ok']
        });
        this.nav.present(alert);

    }
}

Answer 2

我也在研究ionic2，并且需要实施＆＃34; PopUp＆＃34;我现有应用程序中的窗口。我尝试了很多，因为没有完成我的任务，最后我做了类似的事情 -

弹出up.html
<button block dark (click)="showAlert()">Help Window</button>

弹出up.ts

import { Component } from '@angular/core';
import { Alert, NavController, NavParams} from 'ionic-angular';

@Component({
  templateUrl: 'build/pages/pop-up/pop-up.html',
})

export class PopUpPage {
    static get parameters() {
      return [[NavController]];
    }
    constructor(private nav: NavController) {
      this.nav = nav;
    }

    showAlert() {
      let alert = Alert.create({
        title: 'Help Window!',
        subTitle: 'Mindfulness is here for you and your soul. We are intended to stablish your connection to All Mighty.',
        buttons: ['Cancle']
      });
      this.nav.present(alert);
    }
}

这对我来说很好。

希望它也适合你。

Answer 3

试试这个：

具有文件夹和文件的这种结构

在：

home.html的

<ion-header>
    <ion-navbar>
        <ion-title>Ionic 2 Notifications</ion-title>
    </ion-navbar>
</ion-header>

<ion-content padding>
    <button block dark (click)="showAlert()">Alert</button>
</ion-content>

在：

home.ts

import {Component} from "@angular/core";
import {NavController, AlertController} from 'ionic-angular';

@Component({
    templateUrl: 'home.html'
})
export class HomePage {

  constructor(public alertCtrl: AlertController) {
  }

  showAlert() {
    let alert = this.alertCtrl.create({
      title: 'New Friend!',
      subTitle: 'Your friend, Obi wan Kenobi, just accepted your friend request!',
      buttons: ['OK']
    });
    alert.present();
  }

}

我从文档站点获得了这些信息： https://ionicframework.com/docs/v2/components/#action-sheets

Answer 4

似乎尚未准备好......

调查代码

        this.nav.present(alert);

它正在传递并返回：

if (rootNav['_tabs']) {
                // TODO: must have until this goes in
                // https://github.com/angular/angular/issues/5481
                void 0;
                return;
            }

离子2警告不在网页上工作

4 个答案: