css - JavaScript Changing BG Color -

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i made div background-color set rgb(0,0,0); , want change it's color on click javascript. made function that. 

function change(){ var x = 1; var y = x + 100; document.getelementbyid("box").style.backgroundcolor = "rgb(" + y + "," + y + "," + y + ")"; }

it works fine can change div's color once. want div's color value , set x , run function again. bg go black->grey->white on each click. depending on y variable.

i can div's value it'll in "rgb(0,0,0);" format. don't know after getting this. how manipulate integers in rgb(0,0,0); ?

you can store current x value in data attributes:

function change(box) {     var x = +box.getattribute('data-x'), // +box.dataset.x modern browsers         y = x + 100;     box.style.backgroundcolor = "rgb(" + y + "," + y + "," + y + ")";     box.setattribute('data-x', y); }

html

<div id="box" onclick="change(this)"></div>

demo: http://jsfiddle.net/wuz75/


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