html - Javascript function not working properly in IE<10 -

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i have link, hides , shows fb:comments element

<a onclick="comments(this)"> + comments (     <fb:comments-count href="http://some.url.com" fb-xfbml-state="rendered">         <span class="fb_comments_count">1</span>     </fb:comments-count> ) </a>  <div class=\"facebook-comments\"><!-- default style 'display:none'-->     <fb:comments href=\"http://some.url.com" width="644" num_posts="10">     </fb:comments> </div>

this comments() function:

function comments(src){     //hide 'a' element called function     src.style.display="none";       //show comments element      src.parentnode.getelementsbyclassname('facebook-comments')[0].style.display="block";     return false; }

this works fine in chrome, firefox, opera, safari , ie10 too, it's buggy in ie<10, happens when click + comments (#) link disappears comments div not appearing, link becomes useless.

is ie problem or did wrong?

in both cases, how can solve it?

getelementsbyclassname not supported old ie. mdn claims support since ie9.

another option queryselector or queryselectorall. supported since ie8:

src.parentnode.queryselector('.facebook-comments').style.display="block";  //or  src.parentnode.queryselectorall('.facebook-comments')[0].style.display="block";

if want support ie7 (or if syntax), best bet use framework or library. popular framework available jquery (the sizzle engine, part of it, available separate download well). jquery:

$(src).parent().find(".facebook-comments:first").show();

if want avoid external libraries and want support ie7, choices quite limited, getelementsbytagname still available (since ie 5.5). sadly, classlist isn't:

var elems = src.parentnode.getelementsbytagname("div") for(var = 0; i<elems.length; i++){   elem = elems[i];   if(elem.classname.matches(/(^| )facebook-comments( |$)/){     elem.style.display = "block";     break;   } }

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