AngularJS – Radio Buttons – Three Scenarios


This post will detail how to AngularJS can enhance the usage and functionality of Radio Buttons.

Three scenarios are covered.

  1. Each radio button represents an object. For example, there may be a radio button for each element of an array. When one of the radio buttons is selected, a variable is assigned the corresponding array element. So, a variable called $scope.selectedPerson can be automatically assigned to the selected ‘person’ in an array of ‘person’ objects.
  2. Similar to ‘1’ except instead of selecting a complete object, it’s possible to select just a property of an object. E.g. instead of $scope.selectedPerson, the variable can be $scope.selectedPersonName. This is a simple elaboration on the first scenario purely for emphasis.
  3. This scenario is considerably different. Take elements being added to an array dynamically through a UI, the user adding the elements needs to assign one of them as the default element. This is achieved by setting a property (isDefault = true for example) in the array element object. The other array elements have their isDefault property set to false. Unlike the previous two examples, an external variable is not being set, the elements of the array themselves are being manipulated.

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AngularJS – isolate scope – ‘=’ (function reference)


This blog demonstrates how to pass a reference to a function to an angular directive/template.

The way in which the child directive/template calls the parent is also demonstrated.

The example is available as a working JSFiddle here.

This tutorial details creating directive/templates in general (without an isolated scope).

This tutorial demonstrates passing values by value to angular directives/templates (@).

This tutorial demonstrates passing values by reference to angular directives/templates (=).

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CORS Stateless REST Service with detached HTML5 client


This blog will detail in precise steps how to create a stateless REST service that is consumed by a HTML5 client on another domain. The HTML5 client could easily be a Cordova or Phonegap app.

The HTML5 client is simple and basic just for demonstration purposes. It shows the characteristics necessary for Cross-Origin-Resource-Sharing (CORS) communication.

The REST service is also simple. It demonstrates how to enable CORS on the server application.

While both Client and Server projects are proliferated throughout this blog, the completed artifacts are available for download at the bottom of this page.

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AngularJS – isolate scope – ‘=’ (pass by reference)


This blog will explore the concept of passing object to angularJS directives / templates using by reference.
When an object is passed by reference both the parent (controller or parent directive) and the child directive/template have access to the object. The relationship is bidirectional.

This tutorial details creating directive/templates in general (without an isolated scope).
This tutorial demonstrates passing values by value to angular directives/templates (@).

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AngularJS – isolate scope – ‘@’ (pass by value)


Objects can be passed into an angularJS directive in any one of the following ways:
By value using ‘@’
By reference using ‘=’
As a reference to a function in the parent controller using ‘&’

The next few blogs will detail each of these techniques.

This blog will detail the ‘@’ (by value technique).
For detail on creating an angularJS template via a directive please see this blog

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Spring 4 Web MVC – Hello World using Annotation and Java configuration with Netbeans

This blog will go through the steps required to setup a basic Spring 4 MVC web application using Netbeans and Maven. The Spring 4 project will be configured using annotations and plain Java rather than XML.

It is a step by step guide to getting up and running quickly. There are plenty alternative methods to doing this but this one is simple, lightweight and to the point. A maven project is available for download at the end of this blog.

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Rounding a number up to it’s nearest order of ten

I’m hopeless at math, this is just for future reference as it really bugged me. How to round a number up to it’s upper order of 10. Not a simple as it may seem.


800 -> 1000
125 -> 1000
80 -> 100
43 -> 100
8 -> 10
9 -> 10
0.8 -> 1
0.23 -> 1
.08 -> 0.1
(consider -> to be “goes-to” or “rounds-up-to”)


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Using templates with AngularJs

The purpose of this blog is to demonstrate how to use templates in AngularJS. A fully worked example is provided via jsFiddle. The example is simple and easy to follow. A detailed but succinct explanation of the code is provided.

The template is “complex html” that we’ll want to reuse. The directive will allow this complex html to be delivered anywhere without code duplication. This obviously has advantages in terms of code reuse and maintainability.

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AngularJS – Permitting AngularJS templates in IE8

So, you’ve got something like this:

But you find that in IE8 the directive that populates the <mytemplate/> element is not working at all in IE8. IE8 will not initialise the controller and hence your $scope is null.

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Hibernate-Search Multiple-value Facet-Counts


The hibernate-search facet search API is pretty amazing but it lacks a little on the following:

  • Facet-Count values are incorrect where a facet matches a fields that have multiple values. I.e. the facet-counts are correct where the facet has a 1-to-many relationship with result-set items but the facet-counts are entirely incorrect where the facet has a many-to-many relationship with result-set items.
  • The facet-count values are that of the number of matched result-set items within the result-set as distinct from the number of matched result-set items that will be merged into the result-set if the facet is applied. This is highly undesirable where more than one facet-group is used conjunctively. Let’s explain…
    • Facet-counts are available before any facets are applied. Adjusted facet-counts are available after facets are applied. This is great because it facilitates two different usages. With the former, the facet-counts can remain static as facets are selected and deselected. With the latter, applying one facet will reduce the facet-count for other facets. In fact, the other facet-counts can reduce to zero. This zero count does not necessarily mean no result-set items will result from applying the facet. Consequently, we don’t know if clicking on the facet will yield new results or not. If a facet yields no results, and it is used in conjunction with facets from another facet group, this can lead to a zero-results situation. Confused? no problem Ok, allot of detail, description, example and analysis is provided in this blog.
  • These issues are identified in the following discussion threads:
  • This blog delivers a comprehensive solution to all issues surrounding facet-counts in hibernate-search. The solution is derived from the information provided here: A java class that delivers the solution is provided. There is also a fully working maven project demonstrating the solution in action.

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Understanding Faceted Searching


Tony Russell-Rose describes faceted searching in great detail in these posts:

They’re well worth a read before even contemplating developing a faceted search.

There are many types of faceting techniques available. This blog focuses on a facet-search where the facets and results remain on a single page. Facets dynamically reduce and expand the result-set on the same page. A good comparable might be the faceted people search on This one is also a really good example:

We’re going to describe faceted searching and its oddities through example. The examples proliferate in complexity towards an end result which hopefully will yield an understanding of how faceted searching can (or dare I indulge, should work). Some rules for development/behavior will emerge; these will be emphasized and summarized throughout. At the end there is some rambling and a solution for a hibernate-search implementation but for the first 99% of the blog there is no focus on implementation; the focus is exclusively on the following.

  • What exactly a faceted search really is.
  • The behavior of the result-set in response to applying or removing facet selections.
  • What the numbers beside the facets (facet-counts) really mean (cardinality).
  • The different relationships between facets and result-sets e.g. 1-to-Many V.s. Many-to-Many.

The examples used throughout are simple to understand but they will provoke allot of thought because filtering results by facets is not as straight forward a process as may seem at an initial glance. It can be extremely confusing. Each example is a fully working jsFiddle.

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A jQuery plugin: delayedClickAction

A jQuery plugin to allow an element to be clicked many times before a specified action is performed. The action/event-handler will be invoked after a specified delay.


Example: Increment a qty multiple times by clicking before an ajax call is made.

Applies to any jQuery query. i.e. a bunch of elements can be involved in the delayed response.

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jQuery hasAttr() has Attribute plugin

Straight from here:


Use as so:


Where the attribute being checked for is ‘rel’.


Resolving AngularJS minimization / obfuscation issues

AngularJs uses Dependency Injection (DI) to supply objects/variables during configuration.
Variables that begin with the $ character tend to be injected, therefore if a minimizor and/or obfuscater changes the variable name, the DI will not be performed.

This Angular Crash Course provides a detailed intro on AngularJS.

This blog details a common solution to the problems arising from minimization / obfuscation.

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AngularJS – A crash course – in processing AJAX JSON

I’ve recently started using AngularJS . It’s very impressive. It’s extremely useful for handling/processing AJAX JSON results.

This blog demonstrates the following:

  1. Setting up an AngularJS “application”.
  2. Binding (dynamic) JSON data to the view. I.e. processing an AJAX callback.
  3. Invoking an AngularJS Controller function externally from outside the AngularJS scope.


  1. The above is demonstrated with a simple html page that loads some JSON asynchronously (using AJAX). The code is available for download below.
  2. The result is something of a crash course on AngularJS.

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