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Editable Datagrid for Ruby on Rails Built with dhtmlxGrid

This tutorial will guide you how to display tabular data in Ruby on Rails with dhtmlxGrid Standard Edition, which is available under GNU GPL. We will end up with a datagrid with in-line editing, sorting, and filtering, which loads its data from server and saves it back to the database using Ruby on Rails.

As an example, we will create a table of users. This is a quite common task nearly for any web application. Working with RoR, we could use scaffolds but they are not so good for navigation on large sets of data. Besides, dhtmlxGrid has client-side editing and filtering functionality, which can simplify things a lot. This is how our final grid will look like:

Creating a Simple Web Application Using a MySQL Database

This document describes how to create a simple web application that connects to a MySQL database server. It also covers some basic ideas and technologies in web development, such as JavaServer Pages (JSP), JavaServer Pages Standard Tag Library (JSTL), the Java Database Connectivity (JDBC) API, and two-tier, client-server architecture. This tutorial is designed for beginners who have a basic understanding of web development and are looking to apply their knowledge using a MySQL database.

How to Create an Image in PHP

PHP makes it very easy to do many things needed on a website, among which is to create an image. The ability to generate an image in PHP can be useful if you want to do things like create CAPTCHA images, or even design a banner or logo on the fly the way some free blogging software do.

By the end of this tutorial, you will be able to create or modify an existing image using PHP, set the colours of its background, the text and the lines you draw, write text to that image, draw a line and set its thickness. You will also be able to either send that image to a web browser or to save it as a file. Armed with this basic foundation, you will also be able to knowledgeably explore further and perform more complex operations on images using PHP if you wish.

How to Prevent Email Injection in Your PHP Form to Mail Scripts

Nowadays, many websites no longer post their webmasters' email addresses, preferring instead to put up a contact or feedback form. Without the plethora of email addresses to harvest from websites, spammers have turned to using such feedback form scripts to send spam instead. If you are writing your own feedback form script, it is important that you write your script in such a way so as to prevent spammers from hijacking the script to spam others.

Creating a Simple PHP Cache Script

Cache is a programming concept that can be used in a various range of applications and for various purposes. A cache library can be used for storing database queries for later use, to store rendered pages to be served again without generating them again, or to save indexed pages in a crawler application to be processed by multiple modules.

Creating a Sun Effect

In this quick tutorial I will demonstrate how to create a sun effect with rotating sunrays. We will achieve this with some basic ActionScript and a some flash creativity.

How to write a simple scraper in PHP without Regex

Web scrappers are simple programs that are used to extract certain data from the web. Usually the structure of the the pages is known so scrappers have reduced complexity compared to parsers and crawlers.

In this tutorial we are going to create a simple parser that extract the title and favicon from any html page.

PHP cURL functions tutorial

cURL is a library which allows you to connect and communicate to many different types of servers with many different types of protocols. Using cURL you can:

Implement payment gateways’ payment notification scripts.
Download and upload files from remote servers.
Login to other websites and access members only sections.

PHP cURL library is definitely the odd man out. Unlike other PHP libraries where a whole plethora of functions is made available, PHP cURL wraps up a major parts of its functionality in just four functions.

Managing Databases in MySQL

CREATE DATABASE statement will create the database with the given name you specified. IF NOT EXISTS is an option part of the statement, this part prevents you from error if there is a database with the given name exists on the database server. In our tutorial, for example, to create classicmodels database, you just only apply CREATE DATABASE statement above as follows

Submitting forms using PHP cURL

In the previous article, we covered the PHP cURL basics. Specifically, we learned how to connect to a remote URL and retrieve the URL’s contents. In this article we will learn how to simulate form submission using PHP cURL.

Spiral Exit Text Presentation

Using this thoroughly explained, detailed flash lesson, I will explain to you how to create spiral exit text presentation. This presentation can be used for some flash banner or for some animation. Let's start!

How to learn table structure in MySQL

In mySQL there is a magic function named describe.You may get some specific information about a database table. Thisfunction returns all columnswith their data types, default values and some extras.

HMVC: an Introduction and Application

This tutorial is an introduction to the Hierarchical Model View Controller(HMVC) pattern, and how it applies to web application development. For this tutorial, I will use examples provided from the CodeIgniter from Scratch series and demonstrate how HMVC can be a valuable modification to your development process. This introduction assumes you have an understanding of the Model View Controller (MVC) pattern. We suggest you read our introduction to MVC to get acquainted with the topic before tackling this tutorial.

Using a flat-file database in Perl

You've all heard of a Poor Man's Copyright: when you come up with a great idea and you send it to yourself in the mail to prove it was your idea. Getting a real copyright can be a pain, and sometimes isn't worth the effort. A poor man's copyright doesn't have all of the benefits of a "real" one, but for the small stuff - it usually gets the job done.

When designing a website, the same sort of problem can arise, you have a project that needs a database setup, but you either don't have the money for a database package, or it's such a small database, that using a commercial package isn't worth the trouble.

Understanding Ruby Arrays

In Understanding Ruby Variables we looked at storing data (such as numbers, strings and boolean true or false values) in memory locations known as variables. The variable types covered in those chapters were useful for storing one value per variable. Often, however, it is necessary to group together multiple variables into a self contained object. This is where Ruby arrays come in. The objective of this chapter, therefore, is to introduce the concept of Arrays in Ruby and provide an overview of the creation and manipulation of such objects. In the next chapter (Advanced Ruby Arrays) we will look at more ways to work with arrays.

Uploading Image File Through JSP Code To Server

This Java API parses InputStream of HTTP POST request with multipart/form-data encode. By this Java API, only the single method call is enough for your file upload Servlets or JSP.

The uploaded file can be saved on the file system. Your Servlets/JSP has the full control over where to save the uploaded files. Or if you don't want to save the uploaded files, your Servlets/JSP can get the binary contents, the file name and the Content-Type of the uploaded files.

Date and Time Representation in Python

There are many different ways to represent date and time in Python programs. This page gives an overview over the different methods and explains how to convert between different representations. The main focus of this page is on how to represent points in time often assuming some fixed, local time zone. This is used for example when analysing log files. I will not explain here how to convert between different time zones or between different calendars.

The for loop

The for..in statement is another looping statement which iterates over a sequence of objects i.e. go through each item in a sequence. We will see more about sequences in detail in later chapters. What you need to know right now is that a sequence is just an ordered collection of items.

ASP.NET, jQuery and Intellisense

Microsoft has partnered with jQuery and because of that, Visual Studio will now include jQuery; if you have downloaded the latest version of ASP.NET MVC, you should find that jQuery was included although it is version 1.2.6 (the current version is 1.3.2).

jQuery is a JavaScript framework that is comprehensive in its current form and constantly improving; the jQuery community has developed a number of terrific plug-ins that continually make the kit more attractive, valuable, and useful; it you have not tried it out, it is definitely worth looking into. As far as the plug-ins go, the tablesorter and tablesorter pager really make the whole thing worthwhile if you are working with MVC at all; I think it is a far better solution than using the paged list option demonstrated in the latest "Nerd Dinner" application made available by Guthrie, Hanselman, Haack, et al., if for no other reason than it handles both paging and sorting rather than just sorting. Other plug-ins also support filtering lists such that if you wanted to display a filtered, sorted, paged list, you can do that with jQuery in a few lines of code, or you can spend quite a bit more time trying to accomplish the same thing in the controller and model code in an MVC application.

Developing Database Applications Using MySQL Connector/C++

This tutorial will show you the essential steps to build and install MySQL Connector/C++ driver, with simple examples to connect, insert, and retrieve data from a MySQL database. Because the focus is on database connectivity from a C++ application, this document assumes that some kind of MySQL database is already up and accessible from the client machine.

Application developers who are new to MySQL Connector/C++ but not to C++ programming and MySQL database, are the target audience of this tutorial.

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Using a MySQL Database with C++

One of the most powerful combinations that any programmer can use is the combination of C++ and MySQL - a flexible programming language with a multi-platform and stable database; but this may seem an intimidating task to the new software developer.

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Applet and Servlet Communication

Java servlets provide a new and exciting method of developing server-side solutions. Servlets provide the features of traditional CGI scripts with the added benefits of efficiency and portability. Currently, major corporations are making the migration from CGI scripts to Java servlets. As a result, the demand for applet and servlet communication is on the rise.

Tagged and Bagged

Ever since Sun Microsystems (aka "the dot in dot-com") came up with Java, the geeks have been screaming themselves hoarse about the wonders of this technology. Terms like "platform-independent code" and "write once, run anywhere" have been given so much airplay that even novice Java developers are aware of them, and the language is also popular with talk-show pundits and Internet consultants, who tout it as the solution to almost all problems of cross-platform compatibility.

Using Regular Expressions with Ruby

Ruby supports regular expressions as a language feature. In Ruby, a regular expression is written in the form of /pattern/modifiers where "pattern" is the regular expression itself, and "modifiers" are a series of characters indicating various options. The "modifiers" part is optional.

Image manipulation and watermarking in PHP with GD2

The following functions are what I usually use to handle images in my projects. We’ve got reScaleImage which will resize and save an image, keeping aspect ratio.

We’ve got constrainImage which will only get new width and height for an image if it is to be scaled using constraints in both x and y. Let’s pretend we’ve got an image that’s 1000×500 and pass its filename and 500 and 500 as constraints on x and y. It should then return 500×250. This function will not actually do anything with the image itself, only get the new dimensions.

Making A Cool Login System With PHP, MySQL & jQuery

Today we are making a cool & simple login / registration system. It will give you the ability to easily create a member-only area on your site and provide an easy registration process.

It is going to be PHP driven and store all the registrations into a MySQL database.

Build a customizable RSS feed aggregator in PHP

RSS (Rich Site Summary, RDF Site Summary, or Really Simple Syndication) has been around since the mid-1990s. Over the years, several variants of the RSS format have popped up and several claims have been made about its ownership. Despite these differences, RSS never ceased to serve its usefulness in distributing Web content from one Web site to many others. The popularity of RSS gave way to the growth of a new class of Web software called the feed reader, also known as the feed aggregator. Although there are several commercially available feed aggregators, it's easy to develop your own feed aggregator, which you can integrate with your Web applications. You'll appreciate this article's fully functional PHP code snippets, demonstrating the use of PHP-based server-side functions to develop a customizable RSS feed aggregator. In addition, you'll reap instant benefits from using the fully functional RSS feed aggregator code, which you can download from this article.

Custom RSS 2.0 Content Feeds using OOP

With WEB 2.0 fast approaching we are scurrying to make our sites ready for the change. Adding syndicated content to get a deeper reach in to this web is one way to get started. In this tutorial i will show you how to make your own RSS 2.0 Content Feed using Object Orientated Programming for your website. At the end of the tutorial there will also be the full script for you to learn by example or just cut out the middle man and use it.

PHP Development: Getting Started

It's been a few years since I echo'd my first HELLO WORLD script. PHP has developed and evolved and yes, it has changed since it was first devised as little Perl extensions on Rasmus Lerdorf's localhost. Still, for a little Home Page script, it has grown into something that is now used on over 200 million websites around the world. That is nothing to be scoffed at. In this article we'll discuss the two most important things we should try to remember when developing in PHP.

How to Count all elements in an array

PHP Count function can count all elements in an array, or properties in an object. Counting an array gives us array kength which is umber of elements it contains.

Building tiny web-applications in Ruby using Sinatra

Sinatra is a library that allows you to build almost any kind of web-based in a very simple manner. When you code in Sinatra you’re bound only by HTTP and your Ruby knowledge. You'll obviously want to start building tiny web-applications and small services, and that's just what we'll do in this article. By the end of this article by Satish Talim, you'll be able to understand how to install Sinatra and its dependencies and how to deploy the tiny web-app to Heroku.

HTML Default Hyperlink Colors

Ever work on hyperlinks on your webpage or blog and suddenly think, "What are the default colors for HTML hyperlinks?". This tutorial answers this question with a handy reference on the default HTML hyperlink colors in their four states.

HTML 5 Tutorial – Rounded Corners

In a previous tutorial, we demonstrated a simple HTML 5 web page layout. In this tutorial, we will change the look of some of the HTML 5 elements and give them rounded corners using CSS (cascading style sheets) rules. We will also separate the elements using margins to give these elements a floating appearance.

Making A Cool Login System With PHP, MySQL & jQuery

We are developing a cool and simple login/registration system in a few easy to follow steps. You can download the complete source code and modify it to fit your own needs.

Connecting to a MySQL Database using Connector/J JDBC Driver

In this tutorial following topics will be covered:

What are Database URLs in JDBC?
Why and how to specify a JDBC Driver name?
How to create a connection to a Database?
An example on how to connect to a MySQL Database?

5 Developing Java Stored Procedures

Oracle JVM has all the features you must build a new generation of enterprise-wide applications at a low cost. The most important feature is the support for stored procedures. Using stored procedures, you can implement business logic at the server level, thereby improving application performance, scalability, and security.

Introduction to VBScript and Windows Script Host

This is a brief introduction to the VBScript language under Windows Script Host (WSH). The target audience is community college students taking their first-year "computer concepts" classes, most of whom have not taken an operating systems class or formal programming language class.

Rolling with Ruby on Rails

Maybe you've heard about Ruby on Rails, the super productive new way to develop web applications, and you'd like to give it a try, but you don't know anything about Ruby or Rails. This article steps through the development of a web application using Rails. It won't teach you how to program in Ruby, but if you already know another object-oriented programming language, you should have no problem following along (and at the end you can find links on learning Ruby).

Four Days on Rails

There have been many extravagant claims made about Rails. For example, Curt Hibbs' Rolling with Ruby on Railsclaimed that you could develop a web application at least ten times faster with Rails than you could with a typical Java framework... The article then goes on to show how to install Rails and Ruby on a PC and build a working "scaffold" application with virtually no coding.

Java file handling tutorial

One of the most frequently used task in programming is writing to and reading from a file. To do this in Java there are more possibilities. At this time only the most frequently used text file handling solutions will be presented

Using the Ruby DBI Module

The Ruby DBI module provides a database-independent interface for Ruby scripts similar to that of the Perl DBI module. This document describes how to write Ruby DBI-based scripts. It is an adjunct to and not a substitute for the Ruby DBI specification documents. See the "Resources" section for a pointer to the specifications and also for information about downloading the example scripts used here.

Using the Ruby MySQL Module

Programs that access MySQL databases can be written in the Ruby scripting language by using Tomita Masahiro's MySQL module. This module provides a Ruby client API; it is implemented as a wrapper around the MySQL C client API. This document describes how to install the MySQL module and use it to write MySQL-based Ruby scripts. A related document describes the Ruby DBI module that provides a higher-level interface that is more abstract and database-independent. See the "Resources" section for a pointer to that document and also for information about downloading the example scripts used here.