html - Javascript - checking if frame is empty -> TypeError: e is null -

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i tried check if frame "content1" , "content3" empty or not , resizing them.

but error:

"typeerror: e null"

window.setinterval(function(){ check(); }, 50);  function check() {      var content1 = document.getelementsbyname("content")[0].contentdocument.body;     var content3 = document.getelementsbyname("content3")[0].contentdocument.body;      if(isempty(content3)) {             if(isempty(content1)) setproperties("0px, *, 0px");             else setproperties("35%, *, 0px");     } else setproperties("25%, 40%, 35%");      window.localstorage.clear(); }  function isempty(e) { return (e.offsetwidth!=0 || e.innerhtml!="\n"); }  function setproperties(value) { document.getelementsbytagname("frameset")[1].cols = value; }

https://jsfiddle.net/ecytve7w/8/

referencing jsfiddle, seems issue doctype. changing dtd under fiddle options "html 4.01 frameset" seems correct issue.

it seems frame elements not exist in document otherwise. getelementsbyname not return them, , tried changing things use id , had same issue.


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