javascript - Need help finding a "tr" tag with a nested "th" tag -


i developing code snippet use tasvideos tas submission finder. snippet add "td" tag beginning of each list entry, people fast readers (and people aren't, since i'm using 3 letter codes) can find tasvideos.org approved tas's , @ them, or other tas want. have 2 modes (system , status). working on status portion , had error. here code. 

wikitable = document.getelementsbyclassname("wikitable")[0]; wikitabletr = wikitable.getelementsbytagname("tr"); var tr; quickscrubheader = document.createelement("th") qshtext = document.createtextnode("quickscrub tas videos") quickscrubheader.appendchild(qshtext) wikitabletr.getelementsbytagname("th")[0].insertbefore(quickscrubheader) (var tr in wikitabletr){     delete addend, addendtext;     td = tr.getelementsbytagname("td");     addend = document.createelement("td")     if(td[3].innerhtml == "published");{         addendtext = document.createtextnode("pub")         addend.appendchild(addendtext)         tr.insertbefore(addend)     } }

the sloppy block of code this: 

quickscrubheader = document.createelement("th") qshtext = document.createtextnode("quickscrub tas videos") quickscrubheader.appendchild(qshtext) wikitabletr.getelementsbytagname("th")[0].insertbefore(quickscrubheader)

i know how make last line of sloppy code work finds "tr" tag "th" tags inside, , puts quickscrubheader element before other elements, how for/in loop have looks value in td[3] , inserts special "td" tag @ beginning of list.

you can use queryselectorall , parentnode:

var th_list = document.queryselectorall('.wikitable > tr > th'); th_list[0].parentnode.insertbefore(quickscrubheader,th_list[0]);

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