html - CSS triangle changing display value with Javascript -


i have got html

<div id="slidemenu">     <div id="slidem1" onmouseover="colorm(1)">something 1</div>     <div id="slidem2" onmouseover="colorm(2)">something 2</div>     <div id="slidem3" onmouseover="colorm(3)">something 3</div>     <div id="slidem4" onmouseover="colorm(4)">something 4</div>     <div id="slidem5" onmouseover="colorm(5)">something 5</div> </div>

and css 

html, body{      font-family: "century gothic", "apple gothic", applegothic, "urw gothic l", "avant garde", futura, sans-serif; } #slidemenu {     float: right; } #slidem1:before, #slidem2:before, #slidem3:before, #slidem4:before, #slidem5:before {     content: "";     position: absolute;     top:0;     right:210px;     width: 0;     height: 0;     border-top: 32px solid transparent;     border-right: 30px solid #602f4f;     border-bottom: 32px solid transparent;     display:none; } #slidem1, #slidem2, #slidem3, #slidem4, #slidem5 {     background-color: silver;     height: 54px;     width: 200px;     text-align: right;     position:relative;     padding: 5px;     color: white;     margin-bottom: 2px; }

and javascript 

function colorm(n) {     document.getelementbyid("slidem"+n).style.backgroundcolor="#602f4f";     document.getelementbyid("slidem"+n+":before").style.display="block"; }

here jsfiddle http://jsfiddle.net/xn6da/ . can see css triangle has default value display: none;. after it's hovered want change it's value visible. tried use document.getelementbyid("slidem"+n+":before").style.display="block"; still hides triangle, how remove display: none; css javascript?

thank you

you cannot modify pseudo classes via javascript. need change adding/removing class. instance, adding css this:

#slidem1.show:before, #slidem2.show:before, #slidem3.show:before, #slidem4.show:before, #slidem5.show:before {    display: block; }

and javascript

function colorm(n) {     document.getelementbyid("slidem"+n).style.backgroundcolor="#602f4f";     document.getelementbyid("slidem"+n+).classname="show"; }

here fiddle. http://jsfiddle.net/xn6da/1/

i recommend removing ids , replacing them common class. currently, every time add element. going need create id , add css.


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