Rounding a number up to it’s nearest factor 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 factor of 10. Not a simple as it may seem.

Examples:

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

Introduction

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: http://sujitpal.blogspot.ie/2007/04/lucene-search-within-search-with.html. 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

Introduction

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

http://isquared.wordpress.com/2011/04/12/interaction-models-for-faceted-search/

http://java.dzone.com/articles/designing-faceted-search

http://isquared.wordpress.com/2011/04/28/where-am-i-techniques-for-wayfinding-and-navigation-in-faceted-search/

http://isquared.wordpress.com/2011/02/17/reflections-on-faceted-search-and-beyond/

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 LinkedIn.com. This one is also a really good example: http://www.bikersbest.dk/en-gb/shop/accessories/fenders-etc

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.

Why?

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:

http://stackoverflow.com/a/4661989/1488103

 

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 http://angularjs.org/ . 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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Asp.NET html <button> element onclick and onserverclick -> client-side validation

The problem solved here is that an asp.net <button> element (html = <button runat=”server” > or <asp:HtmlButton )  doesn’t support a onclientclick event. This prevents performing client side validation ahead of the onserverclick event.

Here’s more on the problem.

http://stackoverflow.com/questions/1245033/asp-net-onserverclick-event-handler-not-called-if-using-onclick

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input and textarea html5 ‘placeholder’ attribute support in IE (or other non compliant browsers)–jQuery plugin

Which results in

clip_image002

Where the text ‘Search Products’ disappears on focus and reappears on blur if the field is still empty. This text is not the ‘value’ of the field.

In addition:

  • If the value of the field is set to empty programmatically (using JS) the placeholder will appear (and vice versa when text is programmatically applied).
  • When the form is submitted with a placeholder visible, the value of the placeholder is not submitted.

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jQuery-UI – Rich Autocomplete component

A problem with the out-of-box jQuery-ui autocomplete component is that:

  • Only text is shown in the dropdown
  • That same text populates the field upon list selection.

Thankfully, this does not have to be the case. Images and other markup can easily be rendered in the suggestion list. Consequently, the text that populates the autocomplete field upon selection is fully customizable.

image

 

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Force IE out of compatibility mode

Add this to within the <head>

<meta http-equiv=”X-UA-Compatible” content=”IE=edge” />

This forces IE out of compatibility mode. IE will ignore compatibility mode settings from the ‘(F12) Developer Tools’ facility.

Here’s some code that will allow testing.

Done using ‘IE Tester’ http://www.my-debugbar.com/wiki/IETester/HomePage

IE7 and IE8 will render this differently. IE8 in compatibility view mode will render it as IE7 does.

 

Comments welcome…..

 

 

 

Java Hibernate ManyToMany Tutorial – With Add and Delete examples

The many-to-many mappings and usage thereof can be a little bit weird on first glance.

This tutorial demonstrates:

  1. The mappings (Annotations not XML).
  2. Adding an entity to a group.
  3. Removing an entity from a group.
  4. Listing parents with children.
  5. Listing children with parents.

image

(The Hibernate Logic is completely separate from the UI)

The project is available to download at the bottom of this post.

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