jQuery-UI : change the color of a button using CSS classes

In many web applications it’s necessary to have more than one color button, primary and secondary for example.

Changing the color of jQuery-UI buttons using CSS
Changing the color of jQuery-UI buttons using CSS

This tutorial demonstrates how to achieve this using only CSS.

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jQuery-UI : Specifying different Button Icon colors using only CSS classes

Doing this:

Results in

Specifying Button Icon colors using CSS only rather than using custom JavaScript
Specifying Button Icon colors using CSS only rather than using custom JavaScript

This tutorial demonstrates how changing the icon color can  be achieved.

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jQuery-UI : Applying an Icon to a button using CSS classes

This tutorial simply demonstrates a generic reusable JavaScript snipped which will allow you to specify Button Icon’s using only CSS classes. I.e. no need to apply Icons using JS anymore.

Adding icons to buttons using CSS only
Adding icons to buttons using CSS classes in the same way as using icons in general

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jQuery-UI : Changing the color of an icon

This quick tutorial demonstrates how to change the color of jQuery UI icons.

e.g.

changing the color of jQuery-UI icons
different colored jQuery-UI icons

will result in red and blue icons respectively

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Spring 3 MVC – Adding Objects to a List element on the fly at form submit – (Generic method)

Edit 10-Feb-2015

A much better approach to this problem is simply to use JSON. A number of comments below are in regard to nested lists. The solution detailed here does not readily facilitate nested lists. The solution outlined in this blog does: http://outbottle.com/spring-4-web-mvc-json-handling/. JSON is the recommended way of achieving “Adding Objects to a List element on the fly”

End Edit

Edit 12-Feb-2015

Alternatively, this blog also demonstrates the solution:

Spring 4 Web MVC with AngularJS

Abstract

The project downloadable below is an answer to a question repeated in this blog (Spring 3 MVC – Adding Objects to a List element on the fly at form submit – (Generic method))

“How can I submit nested lists of objects?”

The answer is AJAX and JSON.

A very good approach to this is with AngularJS and Spring as demonstrated here.

End Edit

 

ok, hard to describe this one and hard to find stuff on google so here’s an image explaining.

Add and Remove Items from List Dynamically in Spring 3 Web MVC
Add and Remove Items from List Dynamically in Spring 3 Web MVC

When clicked, the ‘Add’ and ‘Remove’ links in the image generate JavaScript events which add and remove the HTML elements dynamically client-side. The idea is to allow a Java List Object to have elements added and removed dynamically on form submission.

A Generic JavaScript library is provided. It makes the process of dynamically adding List elements (rows or Person objects in this example) effortless for any situation. The JavaScript library provides callabacks thus facilitating an AJAX implementation with little effort.

The Netbeans project and the JavaScript file are available for download at the bottom of the page.

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Hello Spring 3 Security with Netbeans – Role Based Method Protection

This tutorial will outline in simple steps how to do the following:

  1. Create Spring 3 Web MVC project using Netbeans
  2. Introduce Spring Security measures
  3. Limit @Controller method invocation to certain User-Role’s using Annotations
  4. Roles and users are defined within XML configurations.
  5. The full source code is available for download here

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Useful Regex (Regular Expressions)

Description JavaScript Java or C#
Integer No Spaces (anywhere) /^([\d]+)$|^$/g ^([\\d]+)$|^$
Empty String or Integer No Spaces (anywhere) /^([\d]+)$/g ^([\\d]+)$
Alfa or Numeric Characters Only /^[A-Za-z0-9]+$/ ^[A-Za-z0-9]+$
Alfa or Numeric Characters Plus listed Other Chars /^[A-Za-z0-9#!]+$/ ^[A-Za-z0-9#!]+$ Matches alpha or numeric or # or !

 

Telerik ASP.NET MVC – Count the number of elements in a Combobox / DropDownList or AutoComplete UI component

Quick Answer

 

Intro

I had this desperately annoying problem where I had two Combobox components. Using the .CascadeTo functionality, I was able to have the second Combobox load data via an AJAX call based on the selection in the first Combobox. This is standard functionality detailed in the demo site here.

The problem was that if the AJAX call to load the second comboxbox with data returned no elements, the Combobox remained disabled. This was unintuitive for the user and made it look like the UI had frozen.

The solution:

  1. Add an ‘OnDataBound’ event handler to the Combobox then from this…
  2. …. count the number of elements in the Combobox and do something to notify the user if there are no elements

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Custom Annotated Validation with Spring 3 Web MVC

My previous tutorial detailed using Hibernate Validation within Spring 3 Web MVC.  This tutorial shows how to create custom validation annotations.

E.g.

This example annotation only permits the word ‘John’. Optionally, it can be case-sensitive.  Continue reading

Spring 3 Web MVC – Exception Handling – incorporating AJAX

Spring 3 Web MVC Exception Handling with AJAX
Spring 3 Web MVC Exception Handling

This tutorial demonstrates how to handle exceptions in Spring 3 Web MCV.
Emphasis is given to Handling  exceptions that occur during AJAX requests. I.e. in the event of an exception during an AJAX request,  it is not desirable to redirect to an error page, instead JavaScript error handling code should be invoked with relevant information passed in.

 

A Netbeans project is available for download at the bottom of this page.

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.NET MVC 3 Custom AJAX Error Handling

Custom Message From AJAX Error Handling with jQuery and MVC 3
Custom Message From AJAX Error Handling with jQuery and MVC 3

An exception on the server-side will invoke the JavaScript AJAX error handling function. This blog will detail two methods to provide custom error handling, overriting the default.

Both methods allow specific error messages to be returned to the client error handling code. This example applies to .NET c# MVC 3 with jQuery and jQuery form plugin. Before quickly scanning this blog for the solution, please note that the second solution detailed below appears to be a better option.
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.NET Web MVC 3 Multiple File upload limit

Multiple File Upload
MVC 3 - Multiple File Upload

There is a default limit on the file size (or total file size in the case of multiple files) of 4MB.

To increase it, add (or modify)

<httpRuntime maxRequestLength=”???” /> in Web.config

where “???” is the number of kilo bytes to permit in any upload.
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jQuery load() – dynamically loaded content scripts are accessible and can access parent scripts?

The answer is yes actually.

$(‘#dyn’).load(‘dynamic.html’)

The scripts on the existing page can call the dynamically loaded scripts and the dynamically loaded scripts can call the existing static scripts.
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Integrating Hibernate with Spring 3 Web MVC

This tutorial on “Integrating Hibernate with Spring 3 Web MVC” incorporates:

  1. Hibernate Transaction Control
  2. @RequestMapping friendly URL’s. More on this specific Spring 3 Web MVC friendly URL topic here. (Alternative @RequestParam method here)
  3. A Generic DAO suitable for Hibernate operations with Spring 3 Web MVC. More here in this separate Generic DAO tutorial.
  4. Spring 3 Web MVC Dependency Injection (DI) and Inversion  of Control (IoC). More on DI and IoC here.
  5. Netbeans (7.1.1 used here but any version will do)

The complete Netbeans project is available for download here. The SQL for the project is included in the download in the WEB-INF folder.

Update: Jan 8, 2014

———–

The project originally available for download does not work with Netbeans 8 due to libraries that were in Netbeans 7.1.1 no longer available in Netbeans 8. Additionally, a comment below referencing Netbeans 7.0 .1 may suggest the same problem. This enforces the point that a dependency management utility is a much better means of building projects. To that end this project has been recreated using Maven. This ensures it will work irrespective of IDE version. In fact because it’s a maven project it’s not dependant on an IDE at all. It should work on any IDE that supports Maven. Netbeans of course, does support Maven. Here is the download link SpringHibernateCrudMvn for the Maven version of this application.

The POM is quite comprehensive in that it includes support for Spring, Spring-Security, Jackson, Hibernate, Hibernate-search and a bunch of other utilities. It can serve as a template to a certain extent.

—————————————————— (/End Update)

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Setting the Welcome Page in Spring Web MVC

In any Spring Web MVC application, there is a need to set the default landing or welcome page.

Traditionally in Java web applications, this is done in the web.xml file as so:

Or in a spring web mvc application, it might be like this:

With a corresponding controller class RequestMapping:

 

This is ok, because “/” is a valid existing URL but, if the required welcome page is to be a virtual URL such as /person/list a little more creativity is required.
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