Author Archives: Avi

jQuery Deferred – one step closer to desktop apps

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Every time I forget why I like jQuery, they keep reminding me. Not too long ago I came across jQuery deferred (even though it was added already in JQuery 1.5) and I immediately liked it. I feel this feature brings the web application development a bit closer to the desktop development. Deferreds simply let you add multiple callback to long lasting operation calls like Ajax requests. Long lasting operations without JQuery Deferred If you haven’t used deferreds, this is probably how you had done long lasting actions like ajax calls. Long lasting operations like ajax require a callback function. In this case the callback is given as a parameter to the caller. This is fine, but there is a way to add a callback separately from the call. Try it This is actually the simplest example of using Deferreds. JQuery ajax methods (get,post,ajax…) return an object which you can add callback methods to it. Why is it better? Simply because it lets you keep the logic of execution and the logic of the result separated. This makes a more readable and maintainable code. So what is a ‘Deferred’? Deferred is an object which lets you add multiple callback methods to Continue reading jQuery Deferred – one step closer to desktop apps→

JavaScript encapsulation & the module pattern

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Encapsulation is one of the key features of object oriented programming languages. In languages like Java, it is very straight forward concept to implement. Since I know JavaScript is considered an OO language, I decided to try to understand once and for all how to implement encapsulation in JavaScript correctly. Let’s say we have a function with one private field and one public field: Try It The fields are of course undefined since we need to call f1() in order for them to have values. Now let’s create an object from that function: Try It After instancing, x and y both have values, but of course, only y is public. Now lets encapsulate field x. Try It This is the most basic encapsulation and it works. But this approach has a problem, f1() is in fact a kind of constructor. Whenever an instance will be created than the getter method will also be created. This approach is not the preferred way to create methods in JavaScript. The preferred approach in JavaScript is to create the methods attached to the prototype. In this way they will only be created once. But this approach also has a problem, we cannot use it Continue reading JavaScript encapsulation & the module pattern→

Chrome extension: Right-To-Left display in Google Calendar

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I love Google Calendar, but one thing bothered me about it; sometimes I add events with Hebrew and sometimes even a mixture of both English and Hebrew. Google Calendar doesn’t support it, when creating/editing events, it displays it in Left-To-Right order. That’s why I have created this Chrome Extension which works great for Hebrew and Arabic.   View on Github   Download Source code *Google Calendar is a trademark of Google Inc.