Get the value of -webkit-transform of an element with jquery

Your matrix is a 4x4 transformation matrix:

The -770 corresponds to the v_x. To extract it, construct a WebkitCSSMatrix object:

var style = window.getComputedStyle($('#thediv').get(0));  // Need the DOM objectvar matrix = new WebKitCSSMatrix(style.webkitTransform);console.log(matrix.m41);  // -770

You could split the string into an array and get the desired value as usual. Here's a little helper function that does the split part.

function matrixToArray(str) {  return str.match(/\d+/g);}

Update

To preserve decimals: rgba(0, 0, 0, 0.5)

and negatives: matrix(1, 0, 0, 1, -770, 0)

function matrixToArray(str) {  return str.split('(')[1].split(')')[0].split(',');}

Update2

RegExp based solution that preserves decimal and negative numbers:

function matrixToArray(str) {  return str.match(/(-?[0-9\.]+)/g);}matrixToArray('rgba(0, 0, 0, 0.5)'); // => ['0', '0', '0', '0.5']matrixToArray('matrix(1, 0, 0, 1, -770, 0)'); // => ['1', '0', '0', '1', '-770', '0']

I would recommend using the WebkitCSSMatrix object. http://developer.apple.com/library/safari/#documentation/AudioVideo/Reference/WebKitCSSMatrixClassReference/WebKitCSSMatrix/WebKitCSSMatrix.html#//apple_ref/doc/uid/TP40009363

This object has as its attributes the matrix elements. It also provides convenience functions for various transformations.