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How to remove or hide a div, which is inside an IFRAME that pulls an external link?

var ifrm = document.createElement("iframe");
var linkFrm = "https://ExternalLink/";
Example:
var x = linkFrm.document.getElementsByClassName("class");
x.style.height = "0px";
x.style.width = "0px";

If something is inside an iframe, and you don't have the access to the iframe's original location, you simply can't manipulate elements inside it.

Remove iframe after printing

I'm new to HTML and Javascript. I'm trying to write a Javascript function to print the content of an (hidden) iframe in order to print documents (to the user, seemingly) without opening them.
I based the function on the example I found here: https://developer.mozilla.org/en-US/docs/Printing#Print_an_external_page_without_opening_it
Printing the content works fine but the trouble is removing the iframe from the document after the printing has finished. This is what my code looks like now.
function closePrint () {
var element = document.getElementById("printFrame");
element.parentNode.removeChild(element);
}
function setPrint () {
this.contentWindow.__container__ = this;
this.contentWindow.onbeforeunload = setTimeout(closePrint, 100);
this.contentWindow.onafterprint = setTimeout(closePrint, 100);
this.contentWindow.focus(); // Required for IE
this.contentWindow.print();
}
function printPage (sURL) {
var oHiddFrame = document.createElement("iframe");
oHiddFrame.onload = setPrint;
oHiddFrame.width = 0;
oHiddFrame.height = 0;
oHiddFrame.style.position = "fixed";
oHiddFrame.style.right = "0";
oHiddFrame.style.bottom = "0";
oHiddFrame.id = "printFrame";
oHiddFrame.src = sURL;
document.body.appendChild(oHiddFrame);
}
I changed two lines in the example from
this.contentWindow.onbeforeunload = closePrint;
this.contentWindow.onafterprint = closePrint;
to
this.contentWindow.onbeforeunload = setTimeout(closePrint, 100);
this.contentWindow.onafterprint = setTimeout(closePrint, 100);
As it didn't remove the iframes without the timeout.
This works fine in both IE11 and Chrome, but in IE compitability mode (which I think emulates IE7) it gives me an error "Not implemented" when I try to use setTimeout.
So my question is, is there another way to run the closePrint function after a timeout or some other way to remove the iframe from the document when I've printed the content? Any help is appreciated.

after printing, leave the iframe on document.body. When you need to add your next iframe, first run a check for its presence ~ if its present, remove it then (first two lines).
myfunction() {
const iframe = document.querySelector('iframe');
if (iframe) iframe.parentNode.removeChild(iframe);
const i = document.createElement('iframe');
i.style.display = 'none';
i.src = this.study.DocumentUrl;
document.body.appendChild(i);
document.querySelector('iframe').contentWindow.focus();
document.querySelector('iframe').contentWindow.print();
}

refresh page after last appended iframe is loaded

I created a simple bookmarklet to append 3 invisible iframe's to the current document looking like this:
javascript: (function() {
var link = window.location.href;
var desktop = link.replace(".com", ".com/purge");;
var mobile = link.replace(".com", ".com/mpurge");
var tablet = link.replace(".com", ".com/tpurge");
var platforms = [desktop,tablet,mobile];
for (i = 0;i<platforms.length; i++){
ifrm = document.createElement("IFRAME");
ifrm.setAttribute("src", platforms[i]);
ifrm.style.width = 0+"px";
ifrm.style.height = 0+"px";
document.body.appendChild(ifrm);
if(i==platforms.length-1){
ifrm.onload = function(){
location.reload();
}
}
}
})();
what i want to do its to refresh the page im at after the third iframe is loaded but for some reason i cant get this one to work, any idea why?
thx!

i will never be == platforms.length inside of loop, because your loop condition is i<platforms.length.
Make it i == platforms.length - 1 or take reloading outside of the loop

stylesheet not getting applied in internet explorer using iframe

Hello i am facing problem in all IE browser, I am loading iframe inside div using js code but somehow the css classes are not getting applied inside my iframe components like textbox, buttons,etc. . the same code works for chrome and forefox , only IE is creating problems. my code is like...
var head = document.getElementsByTagName('head')[0];
var myCSS = document.createElement("link");
myCSS.rel= "stylesheet";
myCSS.type= "text/css";
myCSS.href= Url + "/public/css/mycss.css";
head.appendChild(myCSS);
//for IE
if (window.attachEvent) {
window.attachEvent("onload", function() {
var divforIframe = document.createElement("div");
divforIframe.id = "divforIframe";
var i = document.createElement("iframe");
i.id = "myIFrame";
i.src = Url;
i.scrolling = "no";
i.frameborder = "0";
i.width = "500px";
i.height = "300px";
divforIframe.appendChild(i);
document.getElementById("myDiv").appendChild(divforIframe);
});
}

How to use hidden iframe connect to the server in GreaseMonky

First,I created a hidden frame like this:
var oHiddenFrame = null;
if(oHiddenFrame == null){
oHiddenFrame = document.createElement("iframe");
oHiddenFrame.name = "hiddenFrame";
oHiddenFrame.id = "hiddenFrame";
oHiddenFrame.style.height = "0px";
oHiddenFrame.style.width = "0px";
oHiddenFrame.style.position = "absolute";
oHiddenFrame.style.visbility = "hidden";
document.body.appendChild(oHiddenFrame);
}
Then,I add a event to the button like this:
var fnLocation = function(){
frames["hiddenFrame"].location.href = "http://meckmeck.cn";
}
var oButton = document.getElementById("mb_submit");
oButton.addEventListener("click", fnLocation, false);
When I click the button,I got a error:
frames.hiddenFrame is undefined

There's no such thing as document.frames. The name-indexed frame array is window.frames (aka just frames).
0-iframes are so old-school, and these days mostly associated with malware-installing exploits (especially on Chinese pages). How about using an XMLHttpRequest instead?