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
As DevOps methodologies expand their reach across the enterprise, organizations face the daunting challenge of adapting related cloud strategies to ensure optimal alignment, from managing complexity to ensuring proper governance. How can culture, automation, legacy apps and even budget be reexamined to enable this ongoing shift within the modern software factory?
SYS-CON Events announced today that Ocean9will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Ocean9 provides cloud services for Backup, Disaster Recovery (DRaaS) and instant Innovation, and redefines enterprise infrastructure with its cloud native subscription offerings for mission critical SAP workloads.
SYS-CON Events announced today that Carbonite will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Carbonite protects your entire IT footprint with the right level of protection for each workload, ensuring lower costs and dependable solutions with DoubleTake and Evault.
SYS-CON Events announced today that Cloudistics, an on-premises cloud computing company, has been named “Bronze Sponsor” of SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Cloudistics delivers a complete public cloud experience with composable on-premises infrastructures to medium and large enterprises. Its software-defined technology natively converges network, storage, compute, virtualization, and management into a ...
SYS-CON Events announced today that Infranics will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Since 2000, Infranics has developed SysMaster Suite, which is required for the stable and efficient management of ICT infrastructure. The ICT management solution developed and provided by Infranics continues to add intelligence to the ICT infrastructure through the IMC (Infra Management Cycle) based on mathemat...
Internet of @ThingsExpo, taking place October 31 - November 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 21st International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. @ThingsExpo Silicon Valley Call for Papers is now open.
SYS-CON Events announced today that HTBase will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. HTBase (Gartner 2016 Cool Vendor) delivers a Composable IT infrastructure solution architected for agility and increased efficiency. It turns compute, storage, and fabric into fluid pools of resources that are easily composed and re-composed to meet each application’s needs. With HTBase, companies can quickly prov...
SYS-CON Events announced today that Systena America will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Systena Group has been in business for various software development and verification in Japan, US, ASEAN, and China by utilizing the knowledge we gained from all types of device development for various industries including smartphones (Android/iOS), wireless communication, security technology and IoT serv...
SYS-CON Events announced today that Juniper Networks (NYSE: JNPR), an industry leader in automated, scalable and secure networks, will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. Juniper Networks challenges the status quo with products, solutions and services that transform the economics of networking. The company co-innovates with customers and partners to deliver automated, scalable and secure network...
New competitors, disruptive technologies, and growing expectations are pushing every business to both adopt and deliver new digital services. This ‘Digital Transformation’ demands rapid delivery and continuous iteration of new competitive services via multiple channels, which in turn demands new service delivery techniques – including DevOps. In this power panel at @DevOpsSummit 20th Cloud Expo, moderated by DevOps Conference Co-Chair Andi Mann, panelists will examine how DevOps helps to meet th...
We build IoT infrastructure products - when you have to integrate different devices, different systems and cloud you have to build an application to do that but we eliminate the need to build an application. Our products can integrate any device, any system, any cloud regardless of protocol," explained Peter Jung, Chief Product Officer at Pulzze Systems, in this SYS-CON.tv interview at @ThingsExpo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA
Multiple data types are pouring into IoT deployments. Data is coming in small packages as well as enormous files and data streams of many sizes. Widespread use of mobile devices adds to the total. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will look at the tools and environments that are being put to use in IoT deployments, as well as the team skills a modern enterprise IT shop needs to keep things running, get a handle on all this data, and deli...
SYS-CON Events announced today that T-Mobile will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City, NY. As America's Un-carrier, T-Mobile US, Inc., is redefining the way consumers and businesses buy wireless services through leading product and service innovation. The Company's advanced nationwide 4G LTE network delivers outstanding wireless experiences to 67.4 million customers who are unwilling to compromise on ...
SYS-CON Events announced today that SoftLayer, an IBM Company, has been named “Gold Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. SoftLayer, an IBM Company, provides cloud infrastructure as a service from a growing number of data centers and network points of presence around the world. SoftLayer’s customers range from Web startups to global enterprises.
SYS-CON Events announced today that Hitachi Data Systems, a wholly owned subsidiary of Hitachi LTD., will exhibit at SYS-CON's 20th International Cloud Expo®, which will take place on June 6-8, 2017, at the Javits Center in New York City. Hitachi Data Systems (HDS) will be featuring the Hitachi Content Platform (HCP) portfolio. This is the industry’s only offering that allows organizations to bring together object storage, file sync and share, cloud storage gateways, and sophisticated search and...