html - Javascript - checking if frame is empty -

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

but size changes every loop

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); }  function setproperties(value) {     document.getelementsbytagname("frameset")[1].cols = value; }

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

well, error means says: e null, e.offsetwidth throw exception. check e also: 

return !!(e && (e.offsetwidth != 0 || e.innerhtml != "\n"));

the !! makes such function returns boolean true or false result, isn't necessary isfoo() functions nice.

why e null? in case it'd because code didn't find either "content" or "content3" elements on page.


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