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Oracle APEX Cookbook : Second Edition
Oracle APEX Cookbook : Second Edition

Oracle APEX Cookbook : Second Edition: Get straight into developing modern web applications, including mobile, using the recipes in this brilliant cookbook for Oracle Application Express (APEX). From the basics to more advanced features, it's a reference book and guide in one.

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Oracle APEX Cookbook : Second Edition

Chapter 2. Themes and Templates

In this chapter we will cover the following topics:

  • Creating your own theme

  • Importing a theme

  • Creating a custom template

  • Including images in your application

  • Referencing CSS classes in your application

  • Controlling the layout

Introduction


Now that we have an application we would like to give it more looks. Maybe the application has to adhere to certain corporate layout standards. Or maybe you just want to add some more colors. Using themes and templates it is possible to give your application some cosmetic changes. A theme is a collection of templates and a template is a collection of components ranging from pages and reports to controls like calendars. A template consists of a header template, a body template, and a footer template. A template also contains some subtemplates, for example, for the success message.

In this chapter, we will present some recipes which will make your application look better.

Creating your own theme


When working with themes, there are some important things to know. First of all, there is the theme export SQL file in which all templates of the theme are included. Secondly, there are the images that belong to your theme. And thirdly, there are the .css files. CSS is an abbreviation of Cascading Style Sheet and describes the style of the elements in a web page. For example, the font of the text or the color of the background. In the stylesheet there are also references to images. It is important that the references in these files are correct, otherwise you will see no style at all, just plain text.

When you want to create your own theme you can do two things: start from scratch or copy an existing theme and adapt it. Starting from scratch is more work as you have to create all the templates as well. Copying and modifying an existing theme costs less time but if you have to change a lot in order to get the desired layout, you might as well start from scratch.

Getting...

Importing a theme


The themes that come with APEX offer enough different styles and layouts to give your application a unique and satisfying look. However, if your application must conform to a specific corporate layout or your application must look the same as another APEX application, you can import a theme. APEX offers an easy way to import and use a theme. You can find several themes (free or commercial) on the Internet.

Getting ready

Make sure you have already downloaded the theme and put it on your filesystem.

How to do it...

  1. In the application builder, go to the application you are working on.

  2. Click on the Export/Import button.

    Select Import. In the next step, enter the name and path of the theme. You can also use the Find button to locate the file. An APEX import or export theme file is just a .sql file. You can even view the contents of the file. It should begin with something like this:

  3. In the file type radio group, select Theme Export. Optionally, you can select the file character set...

Creating a custom template


When you create a theme from scratch, you also have to link the templates to the theme. You can copy templates from another theme to your newly created theme. But you can also create new templates from scratch. We will create a new template in this recipe.

Getting ready

We can go on with theme 115 that we made in the first recipe, so make sure you already created this theme.

How to do it...

  1. In Application Builder, go to the application you are working on. After that, go to the Shared components.

  2. In the shared components page, click on Templates.

  3. Click on the Create button to start the wizard.

  4. In the next step you see nine types of templates. Select the Region template.

  5. Click on From scratch and click on the Next button.

  6. Enter a name for this new template, that is, cust_rep_reg. You can also select the theme this new template should be part of. And finally, select the template class. In our case, we select the Reports region. Click the Create button to finish the wizard...

Including images in your application


A web application will look better when you use images. Of course, APEX 4.0 supports the use of images in web pages. You can easily upload images to the APEX host with your FTP client. To connect to the APEX host, see the description at the beginning of this chapter. You should copy your images to the images directory. APEX uses a shortcut or prefix for this path. Mostly it is /i/ but you can change that. Go to shared components and click on the edit definition link on the right side of the screen, under Application. In the name section you can find this image prefix text item where you can modify the prefix. It is advised to always use the substitution string #IMAGE_PREFIX# instead of /i/ when referring to images in templates or button images to safeguard the URI to the images when modifying the virtual directory on the HTTP server (EPG or Apache).

There is another way to upload images to the APEX environment. In the application builder, go to the application...

Referencing CSS classes in your application


Cascading Stylesheets offer an easy way to quickly change the look and feel of a web application. They hold information about colors, sizes, borders, and fonts. Working with stylesheets is a good way to separate the style and the actual content of a webpage. The HTML document should only contain text and HTML tags.

In this recipe, we will make a simple stylesheet, upload it to the APEX environment, and use it in our application. We will change the buttons and the background of the region. All this is done by referencing classes in the stylesheet.

Getting ready

We will use the user profiles page we made in Chapter 1, Creating a Basic APEX Application so make sure this page is ready. For the buttons we will use other background images. You can make them yourself or you can copy some from the Internet (mind the copyrights). You can find them anywhere. Make sure these buttons have the same size as the original buttons. Once you have made the images you...

Controlling the layout


One of the most difficult tasks of web programing is the control of the layout. In previous versions of APEX, tables were used to place the items on the desired positions. You can use an HTML editor to see a preview of the layout. As from APEX 4.0, new themes are introduced that use divs to position the different components. Divs are almost necessary to be able to use dynamic actions layout. The biggest advantage from div-based layout over table-based layout is that you can precisely position components of the web page.

In this recipe, we will create a page with a report region showing the application users and a chart region with the number of roles used. The two regions will be displayed next to each other.

Getting ready

Just make sure that theme 1 is the active theme.

How to do it...

  1. In the application builder, go to your application.

  2. Click on the Create page button.

  3. Select Report and in the next step, select Classic report.

  4. Leave the page number or assign a number yourself...

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What you will learn

  • Produce feature-rich web applications in APEX 4.2
  • Create smartphone applications using jQuery Mobile
  • Use HTML5 and CSS3 in APEX
  • Generate RESTful web services
  • Working with the latest available plug-in types
  • Make the development process easier by enhancing error handling
  • Developing HTML5 and CSS3 supported web applications
  • Follow hands-on examples to make the most out of the possibilities that APEX has to offer
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Publication date : Oct 25, 2013
Length: 444 pages
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Language : English
ISBN-13 : 9781782179672
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ISBN-13 : 9781782179672
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Table of Contents

14 Chapters
Creating a Basic APEX Application Chevron down icon Chevron up icon
Themes and Templates Chevron down icon Chevron up icon
Extending APEX Chevron down icon Chevron up icon
Creating Websheet Applications Chevron down icon Chevron up icon
APEX Plug-ins Chevron down icon Chevron up icon
Creating Multilingual APEX Applications Chevron down icon Chevron up icon
APEX APIs Chevron down icon Chevron up icon
Using Web Services Chevron down icon Chevron up icon
Publishing from APEX Chevron down icon Chevron up icon
APEX Environment Chevron down icon Chevron up icon
APEX Administration Chevron down icon Chevron up icon
Team Development Chevron down icon Chevron up icon
HTML5 and CSS3 Chevron down icon Chevron up icon
Mobile Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.6
(7 Ratings)
5 star 71.4%
4 star 14.3%
3 star 14.3%
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1 star 0%
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Cliente Amazon Sep 30, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
O livro atendeu a expectativa. É uma fonte de informação para tirar dúvidas. Principalmente para um iniciante no assunto.Recomendaria.
Amazon Verified review Amazon
Surachart Opun Mar 22, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Examples in a book are very useful. Readers can follow each topic (example) and practice it. A book is for some people who are new with Oracle APEX and want to start it. For some people who know and work with Oracle APEX, they can use this book like reference and learn something new in APEX. So, I think it's a good idea to keep this book in your APEX shelf. I still believe a book is easy for reading... and learning in APEX.
Amazon Verified review Amazon
Scott Wesley Mar 10, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
The book is aimed at those new to APEX and intermediate developers - a statement I look out for when assessing books so I know what to expect or what I'm in for. Though I think anyone can learn something new, or adapt a technique you may not have seen before.There are some references to 4.0, but I also share duties for updating manuals and understand you can't be expected to tackle every page, every screenshot in a revision. Looking through the contents I quickly picked up plenty of new & expected additions to this edition:Data upload pagesUsing shipped filesAuthorisation plug-insRESTful web servicesUsing Tomcat with APEX ListenerError handlingPackaged applicationsTable APIsHTML5/CSS3MobileI'd recommend it as a reference to any APEX developer.
Amazon Verified review Amazon
srinivas reddy Apr 25, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Oracle APEX is explained in detail with required examples, so that beginners can also understand the topics quickly.I never had chance to implement web service and Websheets in APEX after reading this book I found its very useful features and Author made a best attempt to cover all the features with proper examples.I recommend this book to all oracle/Apex Developers. Very useful, as a quick reference guide.
Amazon Verified review Amazon
Amazon Customer Feb 20, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This cookbook will help with tasks from daily business. A beginner can lern so many standard things and a pro will get a hint for new ideas. The examples are very helpful and pictured.With the second edition of this book you get information about the first version with an update to the current APEX version. As an extra you will find information about HTML5 and CSS 3 (responsive web design) and the new possibility to create mobile APEX apps.The book is good to read and a must for all APEX developers.
Amazon Verified review Amazon
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