Subtract element width from body width, and add as margin to element

Question

I have an image inside a container. The image should always be at full browser width (100vw). As my layout is responsive, and the container has a fixed width at a certain point (45em), I can't simply use negative margins. So I got an idea, but as a novice I can't seem to achieve it...

This is what I want to do:

Check the body width
Check the container width
Subtract the element width from the body width
Divide this number in two
Add this number as a negative margin to an element

This is what I got so far...

var bodyWidth = $('body').width(); //Check the body width
var elemWidth = $('#content').width(); //Check the container width
var margin = bodyWidth-elemWidth; //Subtract the element width from the body width

I still need to divide the number in two, and add this number as a negative margin to an element.

Help is much appreciated.

Have you tried: $("#yourElement").css("margin-left:" + margin/2 + "; margin-right:" + margin/2); — Kamelkent
– Kamelkent, Commented May 19, 2015 at 8:54

Rizky Fakkel · Accepted Answer · 2015-05-19 09:01:55Z

1

You're on the right track.

var bodyWidth = $('body').width(); //Check the body width
var elemWidth = $('#content').width(); //Check the container width
var margin = bodyWidth-elemWidth; //Subtract the element width from the body width
var dividedMargin = margin / 2; // Divide the margin by 2
var negativeMargin = dividedMargin * -1; // set number to negative number
$(element).css("margin", negativeMargin); // replace element by the element name you want to apply this to.

You can also replace margin by margin-left, margin-right,margin-top or margin-bottom.

answered May 19, 2015 at 9:01

Rizky Fakkel

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1 Comment

Rizky Fakkel Over a year ago

You're welcome! Keep in mind that you can keep this in one line too, so you don't necessarily need 5 variables. My answer does make it more readable than keeping it in one line.

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