We define two CSS classes which we use to apply for alternate list items – using ngClass directive. Alternatively the list items appear in bold and in normal font weight.
ngClass Directive – using ternary operator: src/pages/home/home.html
Here we use ternary operator and whenever i % 2 is zero we apply bold class to that item, if not we apply normal class to that list item.
ngClass Directive: src/pages/home/home.html
< ion-header>
< ion-navbar>
< ion-title>
Company Names
< /ion-title>
< /ion-navbar>
< /ion-header>
< ion-content padding>
< ion-list no-lines>
< ion-item *ngFor="let item of items; let i = index;"
[ngClass]="{'bold': (i % 2 == 0)}">
{{i+1}}. {{item}}
< /ion-item>
< /ion-list>
< /ion-content>
< ion-header> < ion-navbar> < ion-title> Company Names < /ion-title> < /ion-navbar>
< /ion-header>
< ion-content padding>
< ion-list no-lines> < ion-item *ngFor="let item of items; let i = index;" [ngClass]="{'bold': (i % 2 == 0)}"> {{i+1}}. {{item}} < /ion-item>
< /ion-list>
< /ion-content>
This is yet another way of doing the same thing which we did using ternary operator above. Here, if i % 2 is equal to zero, then bold class will be applied, if not it won’t be applied.
Today lets learn how to implement reordering of list items in Ionic 2, using reorder directive and ionItemReorder event.
We’re using previous day code to implement reordering list items. So please go through these two small video tutorials before continuing .. (if you’re an advance user, then you can directly follow todays video tutorial).
In this video tutorial lets learn 1. To build drag and rearrange interface and functionality. 2. Solve the ion-refresher component interference with the reorder directive. 3. Save rearranged data back to the database.
Reordering list items using reorder directive: Ionic 2
But if we have ion-header, ion-footer and other items inside the list for which we do not want the reorder directive to be applied. reorder on ion-item-group: src/pages/home/home.html
In that case we need to group those items on which we want the reordering, and then apply reorder directive on that group, as shown in above example.
reordering code: src/pages/home/home.ts
reorderItems(indexes){
let element =this.items[indexes.from];this.items.splice(indexes.from,1);this.items.splice(indexes.to,0, element);};
reorderItems(indexes){ let element = this.items[indexes.from]; this.items.splice(indexes.from, 1); this.items.splice(indexes.to, 0, element);
};
When the item is dragged and dropped to the new position, (ionItemReorder) event is emitted and this event also provides initial and new position index of the reordered item. Using this, we reorder the list items.
Above code snippet is a simple JavaScript code, where we first get the actual item value which is being reordered(using its index value – indexes.from) and store it in a temporary variable. Next we remove that item from the list. Finally we place that element in the new position. All these operation is done using simple JavaScript splice method.
import { reorderArray } from 'ionic-angular';
class MyComponent { items = []; reorderItems(indexes) { this.items = reorderArray(this.items, indexes); }
}
Ionic 2 also provides helper function called reorderArray to reorder the array of items. Here we import the helper class and then use it to reorder the array of items.
Note that we have a button inside ion-header. We switch the value of btnName variable between ‘edit’ and ‘Done’ alternatively when the user clicks on it. Also we have assigned a variable(flag) to reorder directive. flag is of type Boolean and it also switches between ‘true’ and ‘false’ when the user clicks on btnName button. This way we enable and disable the visual drag and rearrange interface on the list items.
src/pages/home/home.ts
import{ Component } from '@angular/core';import{ NavController } from 'ionic-angular';import{ Storage } from '@ionic/storage';@Component({
selector:'page-home',
templateUrl:'home.html'})exportclass HomePage {
items: any;
btnName: any ='edit';
flag: any =false;
constructor(public navCtrl: NavController, public storage: Storage){this.doRefresh(0);};
doRefresh(refresher){this.storage.get('myStore1').then((data)=>{this.items= data;if(refresher !=0)
refresher.complete();});};
reorderItems(indexes){
let element =this.items[indexes.from];this.items.splice(indexes.from,1);this.items.splice(indexes.to,0, element);};
actionBtn(){if(this.btnName=='edit'){this.btnName='Done';this.flag=true;}else{this.btnName='edit';this.flag=false;this.storage.set('myStore1',this.items);}};}
Here we initialize the btnName with a value of ‘edit’ and flag as ‘false’. So initially, the drag and rearrange interface will be disabled. Once the user clicks on the ‘edit’ button present inside ion-header, the visual drag and rearrange interface appears. After the rearrangement of the item is finished user needs to click on ‘Done’ button and we save the rearranged list items to our database. This way we can persist the rearranged data.
We could even save the data to database inside reorderItems() method itself, so that the data gets saved when the user drags and drops the item in its new position. Without the need for the user to click on ‘Done’ button.
Initially variable ‘btnName’ will be ‘edit’ and flag will be ‘false’. When the user clicks on ‘edit’ button, the label name changes to ‘Done’ and the flag value changes to ‘true’. By this, the drag and rearrange interface appears on the list items. Once the arrangement is done, the user needs to click on the button ‘Done’. When the user clicks on ‘Done’ button, the button label or name changes back to ‘edit’ and the visual drag and rearrange interface gets disabled and optionally we save the rearranged data back to the database.
This code has both ion-refresher as well as reorder directive. Here when the user tries to drag an item downwards the refresher component gets invoked. To avoid that, we can simply disable ion-refresher when we enable reordering and enable ion-refresher when we disable reordering, as shown in below code.
Example Application: We’ve implemented the same code in one of our application ‘RSS Reader‘. Go to ‘Feed’ tab and add few blog / news sites rss feeds and the refresh the ‘Feed’ tab to see ‘list item reordering’ in action.
In today’s video tutorial, I’ll show you how to add ‘pull to refresh’ functionality to your Ionic 2 application. This works on the web(maybe as a progressive web app), on your real device, and even in simulators!
Before proceeding with today’s tutorial, please make sure to watch and understand Ionic Storage: Ionic 2. Because we’re implementing ‘pull to refresh’ for the same code we built for that tutorial.
Today we shall learn 1. How to add ‘pull to refresh’ functionality. 2. Also to customize the ‘pull to refresh’ outlook assets – like icons, text etc.
Here we add ion-refresher as first child of ion-content. This adds pull to refresh functionality on content component.
Once the user pulls down on the content area of the view, doRefresh method is called and it is passed with the refresher event, which has a method called complete(), when called, it collapses whatever is being shown on the screen by ion-refresher-content ( which is the child of ion-refresher ).
Customize pull-to-refresh We customize the look and feel of the pull to refresh functionality using ion-refresher-content‘s attributes. In our example, we have changed the default icon and have added text for both when the user pulls the content area down and while the fresh content is being fetched(before the complete() method is called in the home.ts component).
Note: If we do not explicitly assign or change attributes on ion-refresher-content, it’ll behave according to the defaults of the operating system it’s working on.
Ion Refresher Code – default values for platforms: src/pages/home/home.html
Once the doRefresh method is invoked by the view, we fetch the data and once done, we call complete() method on refresher object, which collapses whatever visual cues ionic is providing to the end user via ion-refresher-content.
Here we need to call doRefresh() method inside the constructor too, without which the application will not have any data when its loaded for the first time – until the user pulls the content view and invokes doRefresh() method. To avoid such inconvenience, we call doRefresh() method inside the constructor and pass in ZERO as its parameter – this way we can bypass calling complete() method whenever the data being passed to doRefresh() method is ZERO.
Ionic 2 comes with Ionic Storage library which makes use of storage engines based on its availability and its priority. For example, in native device it uses SQLite if available, if not it’ll fall back to use localstorage or IndexedDB – again, based on its availability. If the app is being run in the web or as a Progressive Web App, Storage will attempt to use IndexedDB, WebSQL, and localstorage, in that order.
Update:
Ionic has made slight changes in how your import Ionic Storage inside app.module.ts file. You can find it at Ionic Storage Module: Ionic 2. Other than how you import Ionic Storage in app.module.ts file, everything is same as present in this(Ionic Storage: Ionic 2) video tutorial.
In this video lets learn how to store and retrieve JSON data in array format using Ionic 2 Storage with a very simple example.
localstorage, WebSQL and IndexedDB Since Ionic uses browser to render the application, we have access to browser based storage engines like localstorage, WebSQL and IndexedDB. But these storage engines are not reliable. If the device is running on low disk-space and the operating system decides to clear some data, then it might even clear the data stored in these storage engines.
SQLite SQLite is query based RDBMS like Storage System for Mobile Devices. You can create, read, update and delete records just like in RDBMS. If you want to store/persist serious data locally, then you can relay on SQLite. Ionic 2 doesn’t ship with this by default – we can use cordova plugin to make use of SQLite.
cordova plugin add cordova-sqlite-storage
cordova plugin add cordova-sqlite-storage
Once we install this cordova plugin, Ionic 2 Storage library will priorities SQLite and make use of it instead of localstorage or IndexedDB.
Remember, Ionic Storage uses SQLite only on the native device. If you run the same application on the web maybe as a Progressive Web App, Ionic Storage will switch to use IndexedDB, WebSQL, and localstorage, in that order.
Make sure to import the library first inside home.ts component. Next, create a reference variable for Storage class. Now access the get method of Storage class. Using get method, get the value assocated with the given key. This returns a promise. Once the promise is resolved we get the stored data. If the key is being used for the first time and nothing has been stored yet, then it returns null.
Set Data: src/pages/home/home.ts
this.storage.set('myStore', value);
this.storage.set('myStore', value);
Set the value for the given key. In my case, am using a key called myStore.
First we import the Storage library at the top. Next create a reference variable called storage. Inside the constructor we get / fetch the stored data and assign it to a variable called items, which we iterate through and display on the home.html view.
save() method When the user enters some data in the input field(on the view – home.html) and submits, we check the previously stored data, if present, retrieve it, append the new data and then stored / set it back to the same key.
Here we iterate through the variable items and then display individual array item on the view. We also have a input field where user enters company name and once he/she hits on Add button the data gets saved in storage engine via Ionic 2 Storage.
Other Member functions of Ionic 2 Storage Class remove(key); – Remove any value associated with this key. clear(); – Clears the entire key value store. (Be very careful while using it.) length(); – returns the number of keys stored. keys(); – returns the keys in the store. forEach(iteratorCallback) – Iterate through each key,value pair.
Today lets learn how to code the clickable area of Facebook Native Ad Unit. Before proceeding with today’s tutorial, please visit yesterdays tutorial and learn how to request and display the Native Ad creative inside Ionic 2 application.
In todays video tutorial lets learn: 1. Removing top left corner green patch – clickable area problem. 2. Aligning the clickable area to the Native Ad Unit creative properly. 3. Make sure the top left corner clickable area doesn’t appear once again when we change the device orientation. 4. Removing clickable area once the user switches to other views. 5. Why doesn’t your app show Facebook Native Ads all the time – why is fill rate low?
Here am adding a simple ion-card item with cover image and ion-avatar. We’ve added id’s to each of the elements and will fill the value once the ad data is emitted by onAdLoaded event.
updateXY() method src/pages/home/home.ts
updateXY(left, top){
var h, w, x, y;
var d = document.getElementById('native');
w = d.clientWidth;
h = d.clientHeight;
x = d.offsetLeft - left;
y = d.offsetTop - top;
if(FacebookAds)
FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h);
};
updateXY(left, top){ var h, w, x, y; var d = document.getElementById('native'); w = d.clientWidth; h = d.clientHeight; x = d.offsetLeft - left; y = d.offsetTop - top; if(FacebookAds) FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h); };
Here we dynamically fetch the ad display containers width and height, and then x and y axis values of the display component.
When we scroll the application vertically only y value changes and x value remains constant, when we scroll the view horizontally x value changes and y value remains constant. In most of the application scrolling will only be available vertically.
Finally, we pass x, y, w, h value to setNativeAdClickArea() method along with the Native Ad Units ID as its first parameter.
src/pages/home/home.ts
import { Component} from '@angular/core';
import { NavController } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
constructor(public navCtrl: NavController, public platform: Platform) {
platform.ready().then(() => {
});
};
updateXY(left, top){
var d;
var h, w, x, y;
d = document.getElementById('native');
w = document.getElementById('native').clientWidth;
h = document.getElementById('native').clientHeight;
x = d.offsetLeft - left;
y = d.offsetTop - top;
if(FacebookAds)
FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h);
};
ionViewDidEnter(){
this.platform.ready().then(() => {
if(FacebookAds)
{
FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){
document.addEventListener("onAdLoaded", function(data){
let temp: any = data;
if(temp.adType == "native")
{
document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url));
document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url));
document.getElementById('adTitle').innerHTML = temp.adRes.title;
document.getElementById('adBody').innerHTML = temp.adRes.body;
document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext;
document.getElementById('adBtn').innerHTML = temp.adRes.buttonText;
}
});
}, function(err) { alert(JSON.stringify(err)); });
}
});
};
}
import { Component} from '@angular/core';
import { NavController } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({ selector: 'page-home', templateUrl: 'home.html'
})
export class HomePage { constructor(public navCtrl: NavController, public platform: Platform) { platform.ready().then(() => { }); }; updateXY(left, top){ var d; var h, w, x, y; d = document.getElementById('native'); w = document.getElementById('native').clientWidth; h = document.getElementById('native').clientHeight; x = d.offsetLeft - left; y = d.offsetTop - top; if(FacebookAds) FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h); }; ionViewDidEnter(){ this.platform.ready().then(() => { if(FacebookAds) { FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){ document.addEventListener("onAdLoaded", function(data){ let temp: any = data; if(temp.adType == "native") { document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url)); document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url)); document.getElementById('adTitle').innerHTML = temp.adRes.title; document.getElementById('adBody').innerHTML = temp.adRes.body; document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext; document.getElementById('adBtn').innerHTML = temp.adRes.buttonText; } }); }, function(err) { alert(JSON.stringify(err)); }); } }); };
}
Now we need to access the view scrolling by the user and then dynamically determine the updated x, y coördinates, so that we can update the current clickable area.
Content Reference To get reference to the content component from a pages logic, we can use angular’s @ViewChild annotation and create a variable of type Content and subscribe to its scrolling event. And then pass the x(left offset) and y(top offset) values of the screen to UpdateXY() method, so that it can determine the current position of the Native Ad Unit Creative on the mobile screen.
src/pages/home/home.ts
import { Component, ViewChild } from '@angular/core';
import { NavController, Content } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
@ViewChild(Content) content: Content;
constructor(public navCtrl: NavController, public platform: Platform) {
platform.ready().then(() => {
this.content.ionScroll.subscribe((data) => {
this.updateXY(data.scrollLeft, data.scrollTop);
});
});
};
updateXY(left, top){
var d;
var h, w, x, y;
d = document.getElementById('native');
w = document.getElementById('native').clientWidth;
h = document.getElementById('native').clientHeight;
x = d.offsetLeft - left;
y = d.offsetTop - top;
if(FacebookAds)
FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h);
};
ionViewDidEnter(){
this.platform.ready().then(() => {
if(FacebookAds)
{
FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){
document.addEventListener("onAdLoaded", function(data){
let temp: any = data;
if(temp.adType == "native")
{
document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url));
document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url));
document.getElementById('adTitle').innerHTML = temp.adRes.title;
document.getElementById('adBody').innerHTML = temp.adRes.body;
document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext;
document.getElementById('adBtn').innerHTML = temp.adRes.buttonText;
}
});
}, function(err) { alert(JSON.stringify(err)); });
}
});
};
}
import { Component, ViewChild } from '@angular/core';
import { NavController, Content } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({ selector: 'page-home', templateUrl: 'home.html'
})
export class HomePage { @ViewChild(Content) content: Content; constructor(public navCtrl: NavController, public platform: Platform) { platform.ready().then(() => { this.content.ionScroll.subscribe((data) => { this.updateXY(data.scrollLeft, data.scrollTop); }); }); }; updateXY(left, top){ var d; var h, w, x, y; d = document.getElementById('native'); w = document.getElementById('native').clientWidth; h = document.getElementById('native').clientHeight; x = d.offsetLeft - left; y = d.offsetTop - top; if(FacebookAds) FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h); }; ionViewDidEnter(){ this.platform.ready().then(() => { if(FacebookAds) { FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){ document.addEventListener("onAdLoaded", function(data){ let temp: any = data; if(temp.adType == "native") { document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url)); document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url)); document.getElementById('adTitle').innerHTML = temp.adRes.title; document.getElementById('adBody').innerHTML = temp.adRes.body; document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext; document.getElementById('adBtn').innerHTML = temp.adRes.buttonText; } }); }, function(err) { alert(JSON.stringify(err)); }); } }); };
}
With this code we start getting a nice Native Ad creative, but with a clickable area at the top left corner of the screen. That is because updateXY() method is called only when the user scrolls the screen. So we need to call updateXY() once the view is loaded. Lets pass (0, 0) as (x, y) value to updateXY() as there is no changes in the x, y coördinates initially when the app is loaded. We call updateXY() method inside ionViewDidEnter() method, once the Native Ad emits some data.
src/pages/home/home.ts
import { Component, ViewChild } from '@angular/core';
import { NavController, Content } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
@ViewChild(Content) content: Content;
constructor(public navCtrl: NavController, public platform: Platform) {
platform.ready().then(() => {
this.content.ionScroll.subscribe((data) => {
this.updateXY(data.scrollLeft, data.scrollTop);
});
});
};
updateXY(left, top){
var d;
var h, w, x, y;
d = document.getElementById('native');
w = document.getElementById('native').clientWidth;
h = document.getElementById('native').clientHeight;
x = d.offsetLeft - left;
y = d.offsetTop - top;
if(FacebookAds)
FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h);
};
ionViewDidEnter(){
var that = this;
this.platform.ready().then(() => {
if(FacebookAds)
{
FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){
document.addEventListener("onAdLoaded", function(data){
let temp: any = data;
if(temp.adType == "native")
{
document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url));
document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url));
document.getElementById('adTitle').innerHTML = temp.adRes.title;
document.getElementById('adBody').innerHTML = temp.adRes.body;
document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext;
document.getElementById('adBtn').innerHTML = temp.adRes.buttonText;
that.updateXY(0, 0);
}
});
}, function(err) { alert(JSON.stringify(err)); });
}
});
};
}
import { Component, ViewChild } from '@angular/core';
import { NavController, Content } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({ selector: 'page-home', templateUrl: 'home.html'
})
export class HomePage { @ViewChild(Content) content: Content; constructor(public navCtrl: NavController, public platform: Platform) { platform.ready().then(() => { this.content.ionScroll.subscribe((data) => { this.updateXY(data.scrollLeft, data.scrollTop); }); }); }; updateXY(left, top){ var d; var h, w, x, y; d = document.getElementById('native'); w = document.getElementById('native').clientWidth; h = document.getElementById('native').clientHeight; x = d.offsetLeft - left; y = d.offsetTop - top; if(FacebookAds) FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h); }; ionViewDidEnter(){ var that = this; this.platform.ready().then(() => { if(FacebookAds) { FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){ document.addEventListener("onAdLoaded", function(data){ let temp: any = data; if(temp.adType == "native") { document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url)); document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url)); document.getElementById('adTitle').innerHTML = temp.adRes.title; document.getElementById('adBody').innerHTML = temp.adRes.body; document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext; document.getElementById('adBtn').innerHTML = temp.adRes.buttonText; that.updateXY(0, 0); } }); }, function(err) { alert(JSON.stringify(err)); }); } }); };
}
Here we invoke updateXY(0, 0) initially once the view is loaded i.e., before the user actually scrolls the view area. This removes the top left green clickable area patch. But then there is misplaced clickable area. Looks like the area misplaced is equal to the height of the header element.
Note: Am using that.updateXY() to invoke member function instead of this.updateXY(). To know why I replaced the keyword this in order to invoke member function: setTimeout and setInterval methods: Ionic 2
src/pages/home/home.ts
import { Component, ViewChild } from '@angular/core';
import { NavController, Content } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({
selector: 'page-home',
templateUrl: 'home.html'
})
export class HomePage {
@ViewChild(Content) content: Content;
constructor(public navCtrl: NavController, public platform: Platform) {
platform.ready().then(() => {
this.content.ionScroll.subscribe((data) => {
this.updateXY(data.scrollLeft, data.scrollTop);
});
});
};
updateXY(left, top){
var d;
var h, w, x, y;
d = document.getElementById('native');
var headHeight = document.getElementById("headerHeight").clientHeight;
w = document.getElementById('native').clientWidth;
h = document.getElementById('native').clientHeight;
x = d.offsetLeft - left;
y = d.offsetTop - (top - headHeight);
if(FacebookAds)
FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h);
};
ionViewDidEnter(){
var that = this;
this.platform.ready().then(() => {
if(FacebookAds)
{
FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){
document.addEventListener("onAdLoaded", function(data){
let temp: any = data;
if(temp.adType == "native")
{
document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url));
document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url));
document.getElementById('adTitle').innerHTML = temp.adRes.title;
document.getElementById('adBody').innerHTML = temp.adRes.body;
document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext;
document.getElementById('adBtn').innerHTML = temp.adRes.buttonText;
that.updateXY(0, 0);
}
});
}, function(err) { alert(JSON.stringify(err)); });
}
});
};
}
import { Component, ViewChild } from '@angular/core';
import { NavController, Content } from 'ionic-angular';
import { Platform } from 'ionic-angular';
declare var FacebookAds: any;
@Component({ selector: 'page-home', templateUrl: 'home.html'
})
export class HomePage { @ViewChild(Content) content: Content; constructor(public navCtrl: NavController, public platform: Platform) { platform.ready().then(() => { this.content.ionScroll.subscribe((data) => { this.updateXY(data.scrollLeft, data.scrollTop); }); }); }; updateXY(left, top){ var d; var h, w, x, y; d = document.getElementById('native'); var headHeight = document.getElementById("headerHeight").clientHeight; w = document.getElementById('native').clientWidth; h = document.getElementById('native').clientHeight; x = d.offsetLeft - left; y = d.offsetTop - (top - headHeight); if(FacebookAds) FacebookAds.setNativeAdClickArea('763416880384578_1139417452784517', x, y, w, h); }; ionViewDidEnter(){ var that = this; this.platform.ready().then(() => { if(FacebookAds) { FacebookAds.createNativeAd('763416880384578_1139417452784517', function(data){ document.addEventListener("onAdLoaded", function(data){ let temp: any = data; if(temp.adType == "native") { document.getElementById('adIcon').setAttribute("src", decodeURIComponent(temp.adRes.icon.url)); document.getElementById('adCover').setAttribute("src", decodeURIComponent(temp.adRes.coverImage.url)); document.getElementById('adTitle').innerHTML = temp.adRes.title; document.getElementById('adBody').innerHTML = temp.adRes.body; document.getElementById('adSocialContext').innerHTML = temp.adRes.socialContext; document.getElementById('adBtn').innerHTML = temp.adRes.buttonText; that.updateXY(0, 0); } }); }, function(err) { alert(JSON.stringify(err)); }); } }); };
}
Go to home.html and assign id of headerHeight to the ion-header tag. Now get its clientHeight and subtract it from the current scrollTop of the screen – inside updateXY() method.
On Device Orientation Change The top left corner green clickable area spot appears once again when the device orientation is changed. To deal with that lets add a listener for orientation change and then call updateXY() method. src/pages/home/home.ts
window.addEventListener('orientationchange', function(data){
if(data.isTrusted == 1)
{
this.updateXY(0, 0);
// You can also get the values of x, y, w, h using javascript and then
// assign it to the clickablearea method of FacebookAds.
}
});
window.addEventListener('orientationchange', function(data){ if(data.isTrusted == 1) { this.updateXY(0, 0); // You can also get the values of x, y, w, h using javascript and then // assign it to the clickablearea method of FacebookAds. } });
Remove Native Ad Important: Remove the Native Ad(along with the clickable area) once the user navigates away from the current(Native Ad) view. src/pages/home/home.ts
Make sure to call removeNativeAd() method inside ionViewDidLeave() method in order to remove the Native Ad. Other wise, the clickable area still persists and when user clicks on any other app elements the ad gets triggered and this is against Facebooks(or any other adnetworks) ad policy. So in order to play safe and avoid policy violation or termination of your Facebook Audience Network account, make sure you remove the native ad once the user navigates away from that view.
Important Note Make sure you pass the same native ad units ID to all 3 methods:
var adId = ‘763416880384578_1139417452784517’; FacebookAds.createNativeAd(adId); FacebookAds.setNativeAdClickArea(adId, x, y, w, h); FacebookAds.removeNativeAd(adId);
Still Clickable area is misplaced or not appearing? Sometimes I observed that the clickable area doesn’t work properly in test mode. But the same code works perfectly while displaying real ads. So if you have set isTesting to true, then make it false.
How to get Test Ads? You can simply put this code inside your constructor(wrap it around by platform ready method)
This show start showing test ads, as FacebookAds variable is a global variable to that component. Make sure to change the value of isTesting to false while moving to production or you can simply remove the code if you’re not showing Facebook audience networks banner ads in your application.
Why is my fill rate less than 100% ? Fill rate refers the number of ads Facebook return compared to the number of ads you request. There are several reasons why not all requests are filled:
The person using your app hasn’t logged into the Facebook app in the last 30 days, or the person on your mobile website isn’t logged into Facebook in the same browser. In order to show targeted ads, Audience Network needs to be able to match each person to his or her Facebook profile. Without this match, it can’t fill the request.
The person using your app or site has turned off targeted advertising in his or her device settings.
Your app or site has requested too many ads in a short period of time. Audience Network limits ad delivery to a maximum of 25 ads served per 30 minutes to a single person. Facebook also limit ad delivery if your app or site requests more than one ad for the same banner placement within 15 seconds.
Facebook couldn’t find a relevant ad that matches the targeting and interests of the person using your app or site. Check your filters to make sure you aren’t excluding too many possible advertisers.
Fallback Ad Network In order to make sure you get near to 100% fill of your ad spot, we need to have a fallback ad network. If Facebooks Audience Network doesn’t have ads to serve to a particular user, then we can invoke some other(alternative/fallback) ad networks Native Ad and fill the ad spot. I’ll be showing it in upcoming video tutorials. Stay subscribed to our blog and our YouTube Channel.
Example Application We have implemented Facebook Audience Network in one of our applications: RSS Reader You can use this app to subscribe and keep track of the content you love. You can also subscribe to our blog using the app.
