Archive for March, 2010
Converting String to Single in C#
Some time ago, I needed to get Flash Movie sizes inside of my C# code. I googled and I found some great examples of how I can do it. It was Mike Swanson’s example project called FlashTools. I downloaded it and stated to use. While I was using this code I found a little bug that was occured depending of regional settings in the system. An error occured when FlashTools library tryed to convert String to Single. When I used English locale everything was going OK but when I changed the locale I got “Input string was not in a correct format”. A fix was very simple, I just passed the InvariantCulture as the second parameter of Convert.ToSingle method.
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Compatibility Mode doesn’t work in Internet Explorer 8.. Why?
Today I had a problem with IE8. Compatibility Mode for IE7 didn’t work when I was working with the Artisteer generated theme that I was improving by hands. The tag order does matter but I have never thought it would.
How to test for an empty javascript object
Hi everybody! I’ve just had a discussion of how to test for an emtpy javascript object. As a result, I have several code snippets and I want to share them.
Problem
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alert({} == null); // false alert({} == {}); // false alert({} == {}); // false alert({} == 0); // false alert({} == ""); // false alert({} == []); // false // etc :) |
So, none of the expressions above can check for an empty javascript object.
Pure javascript solution
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function empty(o) { for(var i in o) if(o.hasOwnProperty(i)) return false; return true; } |
| object.hasOwnProperty(property) |
Returns a boolean indicating whether the object has the specified property. This method does not check down the object’s prototype chain.
Learn details of hasOwnProperty here at developer.mozilla.org. |
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JQuery + JQuery.JSON solution
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var o = {}; alert($.toJSON(o) == '{}'); // true var o = {a: 1}; alert($.toJSON(o) == '{}'); // false |
The code above simply converts an object to JSON string.
UPDATE: jQuery.isEmptyObject method
As of jQuery 1.4, there’s isEmptyObject method to detect is the object empty. Look at the followtin code for example:
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$.isEmptyObject({}); // true $.isEmptyObject({someprop: "true"}); // false |
Your way
Well, if you have your way of checking for an empty javascript object I am waiting your comments! Thanks in advance!