fluidGrid.js

This is a jQuery plugin that allows building intuitive draggable layouts from elements spanning multiple columns and rows. While dragging a block the remaining blocks will flow around it with smooth animation.
Also you can resize any blocks, plugin will reflow other blocks.
Note: it's just a proof-of-concept; thanks to gridster.js for the inspiration.
Chrome, FireFox 4+, Safari 5.1.4+, Opera 12+, IE 9+

Demo: http://adagen.github.io/fluidGrid.js/
Run tests: http://adagen.github.io/fluidGrid.js/?test=enabled

Methods

Create grid:

$.fluidGrid({
	columns	: 4, // number of colums in your grid,
	rows	: 5, // number of rows in your grid,
	width	: 235, // width of the minimum cell
	height	: 100, // height of the minimum cell
	spacing : 10 // distance between adjacent cells
});

The grid will created immediately.
Warn: width and height of target htmlNode element will changed due to the necessity to position the blocks within.

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Add new block:

$.fluidGrid('addBlock', {
	colspan	: 1,
	rowspan	: 2,
	left	: 0,
	top		: 0,
	url		: '' // url to loading widget, not done yet
}, callback);

First parameter is an object literal with options,
and the second parameter is a function called after adding block to a grid when a load widget event occurs.
Newly created block passed to the first argument of callback; {Block} block have a couple of methods for interacting with a custom widget. More about Block class: https://github.com/adagen/fluidGrid.js/blob/master/BLOCK.md (russian language!)

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Remove block:

$.fluidGrid('removeBlock', blockId, callback);
$.fluidGrid('removeBlock', Block, callback);

Single param must an instance of Block class (type of Block === 'Block') or block id directly (you can store block id at 'addBlock' method callback). Function "callback" execute only after response of corresponding widget, although the block is removed from the array Grid.blocks[] immediately.

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Destroy grid:

$.fluidGrid('destroy', success, error);

Both params are callback functions and called upon the responses from all widgets.

License

Distributed under the MIT license.