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

Question

I'm manipulating a div with the new cool css3 way of doing a transform like this:

$("#thediv").css("-webkit-transform","translate(-770px, 0px)");

Later on in the script I thought to get the value of the transform like this:

$("#thediv").css("-webkit-transform");

It returns a matrix like this: matrix(1, 0, 0, 1, -770, 0)

What I can't figure out is how to get the 5th value (-770) of this matrix...

Any suggestions? Thanks!

Answer 1

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 object
var matrix = new WebKitCSSMatrix(style.webkitTransform);

console.log(matrix.m41);  // -770