Javascript funny code?

[Bergman1992]

Following lines of code are used to put 'KeepAlive.aspx as a dummy page in the website.


var img = new Image(1, 1);
img.src = 'KeepAlive.aspx?date=' + escape(new Date());

I do not understand that. What is image(1,1) two dimensional array of images? How come image has src property?

The code has been taken from
http://www.codeproject.com/Articles/...out-in-ASP-Net

[Logic Ali]

The parameters specify the dimensions of the image, but in this case are unnecessary.
The code could be written:

new Image().src = 'KeepAlive.aspx?date=' + escape(new Date());

[toicontien]

Some browsers might not make the HTTP request for the image until it is appended to the document.

[Logic Ali]

Some browsers might not make the HTTP request for the image until it is appended to the document.

That may apply when you create an <img> element, but not to an Image() object. Otherwise pre-loaders would not work.