Get svg graphics size when width/height attributes on <svg> are not set

So how to开发者_开发百科 get the size of an SVG file with javascript when width and height are not set on the svg element? The svg is a string, but could be made a DOM if necessary.

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You can use the getBBox() method of the SVGElement object. It tells you the width and height, x, and y offset in pixels without taking into account the scaling of the element.

document.getElementById('myelem').getBBox().width  
document.getElementById('myelem').getBBox().height

are what you're looking for, I think.

EDIT:

1. I've recently also learned that the little known getBoundingClientRect() works as well! You can also do: var el = document.getElementById('myelem'); var mywidth = el.getBoundingClientRect().width;

2. Keep in mind that there is a difference between getBBox and getBoundingClientRect. getBBox gets the initial dimensions - getBoundingClientRect also respects the transformations done with scale etc.

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SVGs are scalable vector graphics, and thus can have any arbitrary height and width. Only the ratio is fixed by the format.