I'm trying to get data from my database firebase, but I get no data to show in list item html because I pushed UserId first in database.
items: Observable<any[]>;
itemsRef: AngularFireList<any>;
constructor(,public fire: AngularFireAuth,public db: AngularFireDatabase)
{
this.itemsRef = db.list('report/');
// Use snapshotChanges().map() to store the key
this.items = this.itemsRef.snapshotChanges().pipe(
map(changes =>
changes.map(c => ({ key: c.payload.key, ...c.payload.val() }))
)
);
}
you can see here no data to show in list item
html
<ion-list *ngFor="let item of items | async">
<ion-item-sliding>
<ion-item>
<h2>{{item.title}}</h2>
<p>{{item.name}}</p>
<p>{{item.username}}</p>
<p>{{item.dateadded}}</p>
</ion-item>
<ion-item-options side="right">
<button ion-button color="danger" (click)="deletReport(item.key)">
<ion-icon ios="ios-trash" md="md-trash" item-end large></ion-icon>
</button>
<button ion-button color="primary" (click)="updatereport(item.key,item.name,item.title)">
<ion-icon ios="ios-create" md="md-create"></ion-icon>
</button>
</ion-item-options>
</ion-item-sliding>
</ion-list>
Related
Hello I wanted to delete record from the realtime firebase database.I have got the key which I wanted to delete, but when I call remove function on reference is shows me error "Reference.remove failed: first argument must be a valid function."
i had refer this docs.
here is my code:
home-customer.ts
deleteLoad(load) {
this.AuthProvider.removeNote(load.key).then(() => {
this.navCtrl.setRoot('HomeCustomerPage');
});
}
home-customer.html
<ion-list *ngFor="let load of LoadMaster">
<ion-item>
Source:
{{load.Source}}
</ion-item>
<ion-item>
Destination:
{{load.Destination}}
</ion-item>
<ion-item>
Load Type:
{{load.LoadType}}
</ion-item>
<button ion-button block (click)="UpdateLoad(load.key)">
Update
</button>
<button ion-button block (click)="deleteLoad(load)">
Delete
auth.ts
removeNote(key) {
console.log('key'+key);
return firebase.database().ref(`/LoadMaster/`).remove(key);
}
It's very sad since more then 3 year no answer...I think this answer will now help to others...
`var adaRef = firebase.database().ref('users/ada');
adaRef.remove()
.then(function() {
console.log("Remove succeeded.")
})
.catch(function(error) {
console.log("Remove failed: " + error.message)
});`
More can be found Firebase documentation
I developing an ionic 2 app where people can add their blood types to firebase.
Now I want to implement a search-page to receive that data from firebase, For instance, somebody wants to search for B Rh+ blood type, simply selects that radio button and when they click search I want to search B Rh+ bloods in Firebase and list them.
here is my search html:
<ion-list>
<ion-item>
<ion-label>Blood Type</ion-label>
<ion-select [(ngModel)]="bloodtype">
<ion-option value="ap">A Rh+</ion-option>
<ion-option value="an">A Rh-</ion-option>
<ion-option value="bp">B Rh+</ion-option>
<ion-option value="bn">B Rh-</ion-option>
<ion-option value="abp">AB Rh+</ion-option>
<ion-option value="abn">AB Rh-</ion-option>
<ion-option value="zp">0 Rh+</ion-option>
<ion-option value="zn">0 Rh-</ion-option>
</ion-select>
</ion-item>
<ion-item>
<ion-range [(ngModel)]="range">
<ion-icon range-left small name>0km</ion-icon>
<ion-icon range-right small name>100km</ion-icon>
</ion-range>
</ion-item>
<button ion-button full icon-left (click)="presentLoading()">
<ion-icon name="search"></ion-icon>
Search
</button>
</ion-list>
and here is my search.ts:
import { Component } from '#angular/core';
import { NavController } from 'ionic-angular';
import { LoadingController } from 'ionic-angular';
#Component({
selector: 'page-search',
templateUrl: 'search.html'
})
export class SearchPage {
constructor(public navCtrl: NavController,public loadingCtrl: LoadingController) {}
ionViewDidLoad() {
console.log('Hello SearchPage Page');
}
presentLoading() {
let loader = this.loadingCtrl.create({
content: "Please wait...",
duration: 3000
});
loader.present();
}
}
I tried to use search bar and receive data with this reference this.bloodRef = firebase.database().ref('/bloods'); but using search bar is not functional since people can type "brh+" or "b" etc.
my firebase hierarchy:
---bloods (id)
------ blood-type: "B Rh+"
You can filter items with orderBy and equalTo functions:
var results = [];
this.bloodRef.orderByChild('blood-type').equalTo(this.bloodtype).once("value")
.then(function(snapshot) {
//snapshot.val() is the object
});
I'm making a social media app using Ionic with a Firebase backend that I communicate with using Angularfire2.
There's a page in my app that lists all the followers of a user by receiving a uid from the NavParams and sends this to a provider that returns a FirebaseListObservable with that user's followers.
followers-page.ts
constructor(public navCtrl: NavController, public navParams: NavParams, public util: UtilProvider, public userProvider: UserProvider, public socialProvider: SocialProvider, private zone: NgZone) {
this.name = this.navParams.get('name');
this.otherUid = this.navParams.get('uid');
this.currentUid = this.userProvider.currentUid();
}
ionViewDidLoad() {
this.zone.run(() => {
this.users = this.userProvider.getUserFollowers(this.otherUid);
});
}
followers-page.html
<ion-header>
<ion-navbar color='danger'>
<ion-title>{{name}} Followers</ion-title>
</ion-navbar>
</ion-header>
<ion-content padding>
<ion-list>
<ion-item style="background-color: #fff" *ngIf="!(users | async)">
<ion-avatar item-left>
<img src="assets/img/defaultAvatar.png">
<h2>Loading...</h2>
</ion-avatar>
</ion-item>
<user-item *ngFor="let user of users | async" [user]="user">
</user-item>
</ion-list>
</ion-content>
user-provider.ts
//Get List of followers of uid
getUserFollowers(uid) {
let users = this.af.database.list(`/users/${uid}/followers`, {
query: {
limitToFirst: 10
}
});
return users;
}
user-item.html
<ion-item style="background-color: #fff" text-wrap>
<ion-avatar item-left (click)="userProfile()">
<img [class]="user.visibility > 1 ? 'profile-pic verified' : 'profile-pic'" [src]="user?.avatar ? user.avatar : 'assets/img/defaultAvatar.png'">
</ion-avatar>
<h2 (click)="userProfile(user)">{{user?.name}}</h2>
<button ion-button item-right *ngIf="!(following)" (click)="followUser()">{{user?.followerCount}} Followers</button>
<button ion-button outline item-right icon-left *ngIf="following" (click)="followUser()">
<ion-icon name="checkmark"></ion-icon>Followed
</button>
</ion-item>
Without the limitToFirst query it displays the correct number of followers as user-items but the profile avatar and the name and the follower status are all blank. When I click on the avatar it pushes the correct user-profile page so the data is there but the DOM isn't being updated.
I have this exact same code in the discover tab of my app (without the NgZone) and it works perfectly there.
I tried it without the NgZone here as well but to no avail so I am just about completely lost as to how to get these users' info to display.
Thanks in advance!
This is my first application in angular 2 and I am doing jwt authentication for my mobile application,i have problem with HTTP post and i already checked my post Url in Postman it works fine and i got token also. but when i post from client side i got an error. Please get me out.
login.html
<form (ngSubmit)="login()" #loginForm="ngForm">
<ion-list>
<ion-item class="email_border">
<ion-label class="labelstyle"> <ion-icon class="icon" color="dark" ios="ios-person" md="md-person"></ion-icon></ion-label>
<ion-input type="text" placeholder="Email" name="name" [(ngModel)]="name" required></ion-input>
</ion-item>
<div style="font-size:0;height:6px;"></div>
<ion-item class="email_border">
<ion-label class="labelstyle"> <ion-icon class="icon" color="dark" ios="ios-unlock" md="md-unlock"></ion-icon></ion-label>
<ion-input type="password" placeholder="Password" name="Kennwort" [(ngModel)]="Kennwort" required></ion-input>
</ion-item>
</ion-list>
<button icon-left ion-button block type="submit" class="log" [disabled]="!loginForm.form.valid">
<ion-icon style="font-size: 30px" ios="ios-key" md="md-key"></ion-icon> Login </button>
</form>
<button ion-button block clear (click)="register()" class="register"> Register For Free Trail </button>
<button ion-button block clear (click)="resetPwd()" class="fpasswd"> Forgot Password </button>
login.ts
login(name,Kennwort) {
this.auth.loginuser(name,Kennwort).subscribe((result) => {
if (result) {
this.navCtrl.setRoot(HomePage);
}
});
}
authservice.ts
loginuser(name:string, Kennwort:string):Observable<boolean> {
var headers = new Headers();
headers.append('Content-Type', 'application/json');
return this.http.post('node.futures-services.com:9000/api/authenticate/', JSON.stringify({ name:name, Kennwort:Kennwort }), { headers:headers })
.map(res => res.json()).map((res) => {
if (res.success) {
localStorage.setItem('token', res.token);
this.loggedIn = true;
}
return res.success;
}).catch((error:any) => Observable.throw(error.json().error || 'Server error'));
}
error look like this error
I am getting data from firebase by using the below code and i am able to create an array using the below code.
fetchPeopleFromFirebase(){
Firebase fbUsers = this.fbObject.child("posts");
fbUsers.once("value", (snapshot) => {
if(snapshot.exists()) {
snapshot.forEach((object) => {
console.log("Current Post");
console.log(object.val());
Firebase fbUserDetails = this.fbObject.child("users");
var createdById = object.child('createdBy/_id').val();
console.log("Checking for : " + createdById)
fbUserDetails.child(createdById).once("value", (snapshot) => {
if(snapshot.exists()) {
console.log(snapshot.val());
}
});
this.posts.push(object.val());
});
}
console.log("firebase Data",this.posts);
}
}
I am storing the data in this.posts and i am trying to use it in the view like :
*ng-for="#post of posts"
But it does not display anything while data is being printed on the console
can anyone help me?
EDIT:
<ion-content>
<ion-card *ng-for="#post of posts">
<ion-item>
<ion-avatar item-left>
<img src="{{post.createdBy.avatarUrl}}">
</ion-avatar>
<h2>{{post.createdBy.firstName}} {{post.createdBy.lastName}}</h2>
<p>{{post.createdBy.profession}}</p>
</ion-item>
<ion-item>
<ion-list-header>{{post.title}}</ion-list-header>
<img src="{{post.image}}">
</ion-item>
<ion-card-content>
<p>{{post.description}}.</p>
</ion-card-content>
<ion-item actions class="demo-card">
<button primary clear item-left (click)="openLikesFollowers()">
<icon thumbs-up></icon>
<div>5 followers</div>
</button>
<button primary clear item-left (click)="openLikesFollowers()">
<icon text></icon>
<div>4 Comments</div>
</button>
<p item-left class="time-ago">
61 views
</p>
</ion-item>
<ion-item actions>
<p item-left class="time-ago">
+5 collegues are following this
</p>
</ion-item>
</ion-card>
</ion-content>