Welcome!

Blog Feed Post

Creating a Tip Calculator Mobile App in Appery.io with jQuery Mobile and PhoneGap

Smashing Magazine has published a great 4-part article on how to build a Tip Calculator mobile app using various mobile technologies, one of them being jQuery Mobile + PhoneGap. As Appery.io platform is based on jQuery Mobile + PhoneGap, I figured I will show that it is even faster and easier to build exactly the same app in Appery.io.

Let’s start!

Creating a new mobile app in Appery.io

The first step is to create a new mobile app in Appery.io. If you don’t have an Appery.io account, get the free Starter plan. To create a new mobile app takes just a few seconds. This is how it looks when the app builder loads (with updated theme: flat-ui, swatch: B):

Screen Shot 2014-04-02 at 12.49.28 PM

Creating the app UI

The app has two pages:

  1. Main tip calculations page
  2. Settings page (popup)

The UI is built by drag and dropping components into the page and setting their properties. This is how the tip page looks:

Screen Shot 2014-04-02 at 12.56.05 PM

This is how the settings page (popup) looks:

Screen Shot 2014-04-02 at 1.08.57 PM

The page has a Select component to change the tip percent (10%, 15%, 20%).

Performing tip calculations

The Calculate Tip button has a Run JavaScript action defined (on Click event) that does the tip calculations. Here is a screen show which followed by the code:

Screen Shot 2014-04-02 at 8.26.40 PM

Code to calculate the tip:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
var billAmount = Number(Apperyio("billAmount").val());
 
if (billAmount === 0) {
    alert ("Please enter bill amount.");   
    return;
}
 
var tipFromSettings = localStorage.getItem('tipPercent');
 
if (tipFromSettings) {
  tipPercent = tipFromSettings;
}
 
var tipAmount = billAmount * tipPercent/100 ;
var totalAmount = billAmount + tipAmount;
 
Apperyio('tipAmount').text('$' + tipAmount.toFixed(2));
Apperyio('totalAmount').text('$' + totalAmount.toFixed(2));

Line 1: Read the value from the input component

Line 3-6: Basic input validation to make sure an amount was entered

Line 8-12: Read the value from local storage. If the value is set, then use it as the tip percent. The tip percent value is saved into local storage in settings popup.

Line 14-15: Perform tip calculations

Line 17-18: Set the tip value and total amount value into the label components (inside the grid)

In the settings popup, when a new percent value is selected (value change event), we save the new value into local storage:

var tip = Apperyio('tipListSettings').val();
localStorage.setItem('tipPercent', tip);

Testing the app

You can test the app right in the browser:

Screen Shot 2014-04-02 at 8.56.18 PM

By scanning the QR code (requires a QR code app), you can also test the app directly on the device.

Publishing as HTML5 mobile app

To publish this app as HTML5 mobile app, simply give the app a sub-domain name. You can also publish using a custom domain:

Screen Shot 2014-04-02 at 9.05.32 PM

After a few seconds, the app is published and live:

http://tip.app.appery.io

Publishing as PhoneGap app

It’s as easy to build a binary for Android or iOS using PhoneGap:

Screen Shot 2014-04-02 at 9.08.11 PM

Once the binary build is done, you will be able to download and then publish the app to the app store.

Summary

Appery.io uses standard mobile technologies such as HTML5, jQuery Mobile, and PhoneGap to create mobile apps. Using a cloud-based visual platform, you dramatically increase speed of development and productivity.

Read the original blog entry...

More Stories By Max Katz

Max Katz heads Developer Relations for Appery.io, a cloud-based mobile app platform. He loves trying out new and cool REST APIs in mobile apps. Max is the author of two books “Practical RichFaces” (Apress 2008, 2011), DZone MVB (Most Valuable Blogger), and is a frequent speaker at developer conferences. You can find out what Max is up to on his blog: http://maxkatz.org and Twitter: @maxkatz.

Latest Stories
Manufacturers are embracing the Industrial Internet the same way consumers are leveraging Fitbits – to improve overall health and wellness. Both can provide consistent measurement, visibility, and suggest performance improvements customized to help reach goals. Fitbit users can view real-time data and make adjustments to increase their activity. In his session at @ThingsExpo, Mark Bernardo Professional Services Leader, Americas, at GE Digital, discussed how leveraging the Industrial Internet a...
On Dice.com, the number of job postings asking for skill in Amazon Web Services increased 76 percent between June 2015 and June 2016. Salesforce.com saw its own skill mentions increase 37 percent, while DevOps and Cloud rose 35 percent and 28 percent, respectively. Even as they expand their presence in the cloud, companies are also looking for tech professionals who can manage projects, crunch data, and figure out how to make systems run more autonomously. Mentions of ‘data science’ as a skill ...
In his session at Cloud Expo, Robert Cohen, an economist and senior fellow at the Economic Strategy Institute, will provide economic scenarios that describe how the rapid adoption of software-defined everything including cloud services, SDDC and open networking will change GDP, industry growth, productivity and jobs. This session will also include a drill down for several industries such as finance, social media, cloud service providers and pharmaceuticals.
IoT generates lots of temporal data. But how do you unlock its value? You need to discover patterns that are repeatable in vast quantities of data, understand their meaning, and implement scalable monitoring across multiple data streams in order to monetize the discoveries and insights. Motif discovery and deep learning platforms are emerging to visualize sensor data, to search for patterns and to build application that can monitor real time streams efficiently. In his session at @ThingsExpo, ...
Ixia (Nasdaq: XXIA) has announced that NoviFlow Inc.has deployed IxNetwork® to validate the company’s designs and accelerate the delivery of its proven, reliable products. Based in Montréal, NoviFlow Inc. supports network carriers, hyperscale data center operators, and enterprises seeking greater network control and flexibility, network scalability, and the capacity to handle extremely large numbers of flows, while maintaining maximum network performance. To meet these requirements, NoviFlow in...
Choosing the right cloud for your workloads is a balancing act that can cost your organization time, money and aggravation - unless you get it right the first time. Economics, speed, performance, accessibility, administrative needs and security all play a vital role in dictating your approach to the cloud. Without knowing the right questions to ask, you could wind up paying for capacity you'll never need or underestimating the resources required to run your applications.
Security, data privacy, reliability and regulatory compliance are critical factors when evaluating whether to move business applications from in-house client hosted environments to a cloud platform. In her session at 18th Cloud Expo, Vandana Viswanathan, Associate Director at Cognizant, In this session, will provide an orientation to the five stages required to implement a cloud hosted solution validation strategy.
"delaPlex is a software development company. We do team-based outsourcing development," explained Mark Rivers, COO and Co-founder of delaPlex Software, in this SYS-CON.tv interview at 18th Cloud Expo, held June 7-9, 2016, at the Javits Center in New York City, NY.
ReadyTalk has expanded the capabilities of the FoxDen collaboration platform announced late last year to include FoxDen Connect, an in-room video collaboration experience that launches with a single touch. With FoxDen Connect, users can now not only engage in HD video conferencing between iOS and Android mobile devices or Chrome browsers, but also set up in-person meeting rooms for video interactions. A host’s mobile device automatically recognizes the presence of a meeting room via beacon tech...
Ovum, a leading technology analyst firm, has published an in-depth report, Ovum Decision Matrix: Selecting a DevOps Release Management Solution, 2016–17. The report focuses on the automation aspects of DevOps, Release Management and compares solutions from the leading vendors.
Continuous testing helps bridge the gap between developing quickly and maintaining high quality products. But to implement continuous testing, CTOs must take a strategic approach to building a testing infrastructure and toolset that empowers their team to move fast. Download our guide to laying the groundwork for a scalable continuous testing strategy.
Adding public cloud resources to an existing application can be a daunting process. The tools that you currently use to manage the software and hardware outside the cloud aren’t always the best tools to efficiently grow into the cloud. All of the major configuration management tools have cloud orchestration plugins that can be leveraged, but there are also cloud-native tools that can dramatically improve the efficiency of managing your application lifecycle. In his session at 18th Cloud Expo, ...
SYS-CON Events announced today that LeaseWeb USA, a cloud Infrastructure-as-a-Service (IaaS) provider, will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. LeaseWeb is one of the world's largest hosting brands. The company helps customers define, develop and deploy IT infrastructure tailored to their exact business needs, by combining various kinds cloud solutions.
Amazon has gradually rolled out parts of its IoT offerings in the last year, but these are just the tip of the iceberg. In addition to optimizing their back-end AWS offerings, Amazon is laying the ground work to be a major force in IoT – especially in the connected home and office. Amazon is extending its reach by building on its dominant Cloud IoT platform, its Dash Button strategy, recently announced Replenishment Services, the Echo/Alexa voice recognition control platform, the 6-7 strategic...
Up until last year, enterprises that were looking into cloud services usually undertook a long-term pilot with one of the large cloud providers, running test and dev workloads in the cloud. With cloud’s transition to mainstream adoption in 2015, and with enterprises migrating more and more workloads into the cloud and in between public and private environments, the single-provider approach must be revisited. In his session at 18th Cloud Expo, Yoav Mor, multi-cloud solution evangelist at Cloudy...