在我们实际使用中往往有这么一种需求：当你进入子页面操作之后，返回要刷新父页面的内容。比如，我做了一个笔记功能，在笔记父页面里（A），内容是我保存的笔记，这个时候我点击添加笔记，跳转到添加笔记页面（B），我写好我的笔记之后点击保存，这个时候跳转回我的笔记父页面，我要父页面的内容显示了我刚刚添加的那一则笔记。
（1）在A页面和B页面中也别引入Events
import { Events } from 'ionic-angular';
并在构造函数中声明
public events: Events
（2）B（子）页面中要跳转的地方添加如下代码
this.navCtrl.pop().then(()=>{
this.events.publish('reloadNotePage');
});
（3）A（父）页面中ionViewDidLoad()添加如下代码
this.events.subscribe('reloadNotePage',() => {
this.items = new Array();
let that = this;
var localpoi:any[]=new Array();
this.storage.get('note').then((data)=>{
if(data==null){
alert("没有数据");
}
else{
localpoi = data;
console.log(localpoi);
for(var i = 0;i<localpoi.length;i++){
var poi = localpoi[i];
that.items.push(poi);
}
}
});
(4)父页面ts完整代码
import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams,ActionSheetController } from 'ionic-angular';
import { NoteAddPage } from '../note-add/note-add';
import { Storage } from '@ionic/storage';
import { Events } from 'ionic-angular';
/**
* Generated class for the NotePage page.
*
* See https://ionicframework.com/docs/components/#navigation for more info on
* Ionic pages and navigation.
*/
@IonicPage()
@Component({
selector: 'page-note',
templateUrl: 'note.html',
})
export class NotePage {
public items:any[] = new Array();
constructor(public navCtrl: NavController, public navParams: NavParams,private storage:Storage,public events:Events) {
}
ionViewDidLoad() {
this.storage.get('note').then((data)=>{
this.items = new Array();
let that = this;
var localpoi:any[]=new Array();
if(data==null){
alert("没有笔记");
}
else{
localpoi = data;
console.log(localpoi);
for(var i = 0;i<localpoi.length;i++){
var poi = localpoi[i];
that.items.push(poi);
}
}
});
this.events.subscribe('reloadNotePage',() => {
this.items = new Array();
let that = this;
var localpoi:any[]=new Array();
this.storage.get('note').then((data)=>{
if(data==null){
alert("没有数据");
}
else{
localpoi = data;
console.log(localpoi);
for(var i = 0;i<localpoi.length;i++){
var poi = localpoi[i];
that.items.push(poi);
}
}
});
});
}
add_note(){
this.navCtrl.push(NoteAddPage);
}
}
（5）子页面ts完整代码
import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams,ActionSheetController } from 'ionic-angular';
import {Camera, CameraOptions} from '@ionic-native/camera';
import { ImagePicker,ImagePickerOptions } from '@ionic-native/image-picker';
import { Storage } from '@ionic/storage';
import { Events } from 'ionic-angular';
/**
* Generated class for the NoteAddPage page.
*
* See https://ionicframework.com/docs/components/#navigation for more info on
* Ionic pages and navigation.
*/
declare var BMap;
@IonicPage()
@Component({
selector: 'page-note-add',
templateUrl: 'note-add.html',
})
export class NoteAddPage {
newLeave:any={};
poi_address:string="";
user_name:string="";
imgDiv = document.getElementById('post_img_1');
public imagesArr = new Array();
image_num:number=0;
constructor(public navCtrl: NavController, private storage:Storage,public navParams: NavParams,public events: Events,public actionSheetCtrl: ActionSheetController,private camera: Camera,
private imagePicker: ImagePicker,) {
//this.newLeave.sqsj=new Date().toISOString();//获取当前时间 这个是零度经线的时间 相差八个小时
this.newLeave.sqsj=new Date(new Date().getTime()+8*60*60*1000).toISOString();//北京时间
var lat=localStorage.getItem("my_latitude");
var lng=localStorage.getItem("my_longitude");
this.get_address_bybaidumap(lat,lng);
this.user_name = "杨啊杨";
}
ionViewDidLoad() {
console.log('ionViewDidLoad NoteAddPage');
}
presentActionSheet() {
let that = this;
const actionSheet = this.actionSheetCtrl.create({
title: '上传照片',
buttons: [
{
text: '拍照',
role: 'destructive',
handler: () => {
this.openCamera(that);
}
},{
text: '相册选择',
handler: () => {
this.pickimg(that);
}
},{
text: '取消',
role: 'cancel',
handler: () => {
console.log('Cancel clicked');
}
}
]
});
actionSheet.present();
}
openCamera(that) {
const options: CameraOptions = {
quality: 70, // 相片质量 0 -100
destinationType: this.camera.DestinationType.DATA_URL, // DATA_URL 是 base64 FILE_URL 是文件路径
encodingType: this.camera.EncodingType.JPEG,
mediaType: this.camera.MediaType.ALLMEDIA, //有PICTURE VIDEO ALLMEDIA
saveToPhotoAlbum: true, // 是否保存到相册
sourceType: this.camera.PictureSourceType.CAMERA , //是打开相机拍照还是打开相册选择 PHOTOLIBRARY : 相册选择, CAMERA : 拍照,
}
this.camera.getPicture(options).then((imageData) => {
console.log('got file: ' + imageData);
// If it's base64:
let base64Image = 'data:image/jpeg;base64,' + imageData;
this.add_img(base64Image);
that.imagesArr.push(base64Image);
that.imagesDataArr.push(imageData);
//alert(that.imagesArr.length);
// If it's file URI
// this.path = imageData;
// this.upload();
}, (err) => {
//alert(err);
// Handle error
});
}
//安卓用不了这个 我还是直接用相机的看看吧～
pickimg(that){
var u = navigator.userAgent;
var isAndroid = u.indexOf('Android') > -1 || u.indexOf('Adr') > -1; //android终端
var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端
if(isiOS==true){
this.ios_pick_img(that);
}
if(isAndroid==true){
this.android_pick_img(that);
}
}
android_pick_img(that){
const options: CameraOptions = {
quality: 60, // 相片质量 0 -100
destinationType: that.camera.DestinationType.DATA_URL, // DATA_URL 是 base64 FILE_URL 是文件路径
encodingType: that.camera.EncodingType.JPEG,
mediaType: that.camera.MediaType.PICTURE, //有PICTURE VIDEO ALLMEDIA
saveToPhotoAlbum: true, // 是否保存到相册
sourceType: that.camera.PictureSourceType.PHOTOLIBRARY , //是打开相机拍照还是打开相册选择 PHOTOLIBRARY : 相册选择, CAMERA : 拍照,
}
that.camera.getPicture(options).then((imageData) => {
console.log('got file: ' + imageData);
// If it's base64:
let base64Image = 'data:image/jpeg;base64,' + imageData;
that.add_img(base64Image);
that.imagesArr.push(base64Image);
that.imagesDataArr.push(imageData);
//alert(that.imagesArr.length);
// If it's file URI
// this.path = imageData;
// this.upload();
}, (err) => {
//alert(err);
// Handle error
});
}
ios_pick_img(that){
const options:ImagePickerOptions ={
maximumImagesCount:9-that.image_num,
quality:50,
outputType : 1 //默认为0，返回类型为file_url;为1,返回值为base64-encoded string
};
that.imagePicker.getPictures(options).then((results) => {
for (var i = 0; i < results.length; i++) {
let base64Image = 'data:image/jpeg;base64,' + results[i];
that.add_img(base64Image);
that.imagesArr.push(base64Image);
that.imagesDataArr.push(results[i]);
// 保存图片到html控件
// var imgUrl = "<img src=" +results[i] +" width=\"60px\" height=\"60px\"> ";
//this.data=this.data+imgUrl;
}
}, (err) => {
alert('未进行照片选取～');
//alert(err);
});
}
change_img_style(){
alert(this.imgDiv.offsetWidth+'px');
this.imgDiv.style.height=this.imgDiv.offsetWidth+'px';
}
test_click_img(){
this.imagesArr.push("assets/imgs/monkey.jpg");
this.imagesArr.push("assets/imgs/noimg.jpg");
this.add_img("assets/imgs/monkey.jpg");
this.add_img("assets/imgs/noimg.jpg");
}
add_img(image_src){
var that = this;
this.image_num++;
// function allscreen(navigator){
// that.statusBar.hide();
// }
//增加image
var div = document.createElement("div");
div.className="image_div";
//var img = new Image();
var img=new Image();
img.className="small_img";
img.src=image_src;
div.appendChild(img);
img.onclick=function(navigator){
var bigImage_father=document.getElementById('bigImage_father');
var big_image_Div=document.getElementById('bigImage');
var big_image_Div_img=document.getElementById('bigImage_img');
var delete_img_button=document.getElementById('delete_img_button');
big_image_Div.removeChild(big_image_Div_img);
bigImage_father.hidden=false;
var img1=new Image();
img1.className="big_img";
img1.src=image_src;
img1.id="bigImage_img";
big_image_Div.appendChild(img1);
bigImage_father.removeChild(delete_img_button);
bigImage_father.appendChild(delete_img_button);
//点击删除按钮 删除图片 并关闭大图
delete_img_button.onclick=function(){
div.parentNode.removeChild(div);
bigImage_father.hidden=true;
that.image_num--;
that.change_add_img_btn();
that.imagesArr[that.imagesArr.indexOf(image_src)]=null;
//typescript完全删除元素是splice，太他妈麻烦，所以用伪删除 将要删除的元素设置为null 到时候判断的时候可不要忘记了哦～～
//that.imagesArr.remove(image_src);
//(that.imagesArr.length);
}
//点机大图，关闭大图
img1.onclick=function(){
bigImage_father.hidden=true;
};
};
var fatherDiv=document.getElementById('my_image_div_father');
fatherDiv.appendChild(div);
this.change_add_img_btn();
}
change_add_img_btn(){
if(this.image_num<9){
//删除原有的
var add_img_btn = document.getElementById("add_img_button_div");
var add_image_div = document.getElementById("post_img_0");
//新增
var div = document.createElement("div");
div.id="add_img_button_div";
div.className="image_div";
div.appendChild(add_image_div);
add_img_btn.parentNode.removeChild(add_img_btn);
var fatherDiv=document.getElementById('my_image_div_father');
fatherDiv.appendChild(div);
}
else{
var add_img_btn = document.getElementById("add_img_button_div");
add_img_btn.hidden=true;
}
}
//百度地图地理逆编码
get_address_bybaidumap(x,y){
let that = this;
//原始GPS坐标转为百度坐标
var baiduPoint = new BMap.Point(y,x);
var myGeo = new BMap.Geocoder();
myGeo.getLocation(baiduPoint,function(result){
if(result){
var address = result.addressComponents.province+'-'+result.addressComponents.city+'-'+result.addressComponents.district+
'-'+result.addressComponents.street+'-'+result.addressComponents.streetNumber;
localStorage.removeItem("poi_address");
localStorage.setItem("poi_address",address);
// that.poi_province=result.addressComponents.province;
// that.poi_city=result.addressComponents.city;
// that.poi_district=result.addressComponents.district;
// that.poi_street=result.addressComponents.street;
// that.poi_streetnumber=result.addressComponents.streetNumber;
alert(address);
}
});
var address = localStorage.getItem("poi_address");
this.poi_address=address;
}
save(note_title:HTMLInputElement,note_content:HTMLInputElement,date:HTMLInputElement,address:HTMLInputElement,recoder:HTMLInputElement){
var title: string = note_title.value;
var content:string=note_content.value;
var note_date=date.value;
var note_address:string=address.value;
var note_recoder:string=recoder.value;
//剔除原来照片数组的null值
var new_image_arr:any[]=new Array();
for(var i = 0;i<this.imagesArr.length;i++){
if(this.imagesArr[i]==null){
}
else{
new_image_arr.push(this.imagesArr[i]);
}
}
var new_image_arr_string = JSON.stringify(new_image_arr);
var date_str =JSON.stringify(note_date);
//note对象
var note ={
'title':title,
'content':content,
'date':date_str,
'address':note_address,
'recoder':note_recoder,
'imgs':new_image_arr_string,
}
this.storage.get('note').then((data)=>{
if(data==null){
data=[];
}
data.push(note);
this.storage.set('note',data);
alert("保存成功");
this.navCtrl.pop().then(()=>{
this.events.publish('reloadNotePage');
});
});
}
}
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