how to set background image and gradient via javascript - without jquery using dom style attribute

Question

Not sure what the syntax should be for setting the background image and gradient (so that I can darken the image)

I can set the background image but not sure how I can set the linear gradient

  holder.style.background = 'url(' + event.target.result + ') no-repeat';
  holder.style.backgroundSize = 'cover';
  holder.style.backgroundlinearGradient = 'rgba(0, 0, 0, 0.7)'  //this doesn't work

Also, can I combine more than one property in style.background to set all 3 size and gradient and image in one line?

Note that I cannot use jquery and want to do this by setting dom attributes if possible.

I would try this without javaScript first. ie just html and css — Yetti99
– Yetti99, Commented Dec 26, 2014 at 17:20
can't install jquery installed in this environment and this has to be set using javascript as an asynchronous response to an event. — MonkeyBonkey
– MonkeyBonkey, Commented Dec 26, 2014 at 17:28
linearGradient is not a CSS property. It is a value of the background property. Perhaps you are looking for the filter property if you want to darken the image. — user663031
– user663031, Commented Dec 26, 2014 at 17:40
use jQuery and add/remove a class where u define your css-values. — user2628521
– user2628521, Commented Dec 26, 2014 at 17:48

RGLSV · Accepted Answer · 2014-12-26 18:32:10Z

4

Now I'm just a js newbie, however, I believe you can combine all your background properties into one larger declaration, or add them through some vars that contain info regarding your css, such as:

var some_fancy_gradient = 'linear-gradient(red, blue)';
var some_fancy_image = 'your url'
yourelement.style.background = 'url('+some_fancy_image+') center center / cover no-repeat,'+some_fancy_gradient+' no-repeat';

See Demo

Don't know if this is what your looking for, but may point you in the right direction.

Also, some documentation:

edited Dec 26, 2014 at 18:32

answered Dec 26, 2014 at 18:11

RGLSV

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6 Comments

MonkeyBonkey Over a year ago

That js fiddle is pretty awesome, great santa BTW

MonkeyBonkey Over a year ago

BTW, what's the syntax for concatenating all those properties, do they have to be in a certain order, when to use slash or commas - is that documented somewhere?

RGLSV Over a year ago

Thanks, glad to help out! Ill post in a sec some resources

RGLSV Over a year ago

There, hope that helps out

roshan Over a year ago

Put all the styling in a css class and just add or remove the className property in javascript.Seems pretty clean.

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