TO THE NEW Blog PAGES
A few days ago I faced a problem of evaluating dynamic expressions on domain objects. The scenario was that, depending upon the user input, I needed to sort a list of objects on some properties, which were nested deep in the object, e.g., [java] student.course?.college?.name // if a user chose to sort students by college […]
Let’s say you have a login page which contains a form with username and password field in it (offcourse, along with a submit button). Let’s say being much focussed towards user convenience with the user interface, you want to put the cursor in the username field of your form as soon as the page loads. […]
In our applications we generally make use of try-catch blocks to handle exceptions. Since JDK-7 , It has certain new features. These features are quite good , I must say. Some of the new changes in try/catch bloack are : 1. Multiple exceptions handling in only one catch block. 2. Finally out of scope. (Try-Catch […]
AOP means Aspect Oriented Programming Enables encapsulation of functionality that affects multiple classes in separate units. Complements Object Oriented Programming. Cross Cutting Concerns : Functionality whose implementation spans multiple modules. Different From OOPS Sometimes we want to implement common functionality through out some classes, through out some common method. We can achieve that functionality by […]
Suppose a scenario, where User and Account classes are linked as below: [groovy] class Account { String email String password // … other fields } class User { Account account String name String address // … other fields } [/groovy] At the time of creating a new User, and accessing the user members, we write […]
Hi, In one of my recent Grails application, i needed to integrate LinkedIn groups with the application. In my previous post, we discussed about Integrating LinkedIn API in any grails application. To add a LinkedIn Group, we first need to authorize the LinkedIn account which has either created that group or is the member/admin of […]
We extensively use Flying Saucer to generate PDFs from GSPs in our grails applications. However, there is always the issue of embedding images from within the application because the URLs are usually relative to the environment and as such, embedding them in PDFs with a URL in the src attribute is cumbersome. To get around […]
I recently found out that use of Regex with jQuery and replace function can turn out to be a very powerful tool for replacing/loading data in html dynamically The use of replace is made like [js] var a = "Some text here text"; a=a.replace(/text/g,"one") [/js] This will replace all “text” with “one” Now imagine how […]
This application saves user’s time for registration by providing a way through which user can login into application with its twitter credentials. Application will get the user details from his corresponding twitter account and will do the registration programmatically, so user can easily manage account through his twitter account. Five simple steps to connect with […]