How to shrink image using Javascript

Question

I'm trying to make a function that whenever I click on the button, the image on the screen width decrease by 100px, the width of the picture are all 800px here is what I have:

var width_of_pic = 800 ;

function shrink() {
  width_of_pic = width_of_pic - 100;
  var image_element= document.getElementById( "image_element_id" ) ;
  image_element.style.width = width_of_pic;
}

you're assigning to a style, so you have to conform to CSS rules. ... = width_of_pic + 'px';. no units = invalid assignment. — Marc B
– Marc B, Commented Jan 7, 2015 at 21:06

j08691 · Accepted Answer · 2015-01-07 21:07:18Z

4

Assuming that the ID is correct, you need to specify a unit:

image_element.style.width = width_of_pic+'px';

jsFiddle example

answered Jan 7, 2015 at 21:07

j08691

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