Remove iframe after printing - javascript

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();
}

Related

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

javascript: IFrame-SRC as new Window?

I have a web application in which I have a bunch of iFrame from with source from other tools.
Now the user should have the possibility to open the iframe content in a new window / new tab, normaly I would simply add something like this:
function onButtonClick() { var src = $('#iframe').prop('src');
windows.open(src, "_blank"); }
But his would only open a new version of my iFrame context, e.g. if a user open a page in the iframe or clicked on something and javascript changed something within my iframe, the user would be loosing this value..
So, can I make a iframe Content to a new window content without loosing the dynamic state of the website within my iframe?
You cannot move around iframes between different windows without reloading, because the spec says the attributes must be reevaluated:
When an iframe element is inserted into a document that has a browsing context, the user agent must create a nested browsing context, and then process the iframe attributes for the "first time".
-- https://html.spec.whatwg.org/multipage/embedded-content.html#the-iframe-element
(via https://bugzilla.mozilla.org/show_bug.cgi?id=254144#c97)
Old answer:
// edit: Does not work as expected, since the iframe is reloaded on move and the original src is restored.
It is easy enough if you move the iframe out of the current page:
<button id="example-button">open in new window</button>
<div id="example-container">
<iframe id="example-iframe" src="https://example.com/">
</iframe>
</div>
document.getElementById('example-button').addEventListener('click', function (ev) {
ev.preventDefault();
var win = open('about:blank');
var iframe = document.getElementById('example-iframe');
// the popup might not be immediately available:
setTimeout(function () {
var body = win.document.body;
body.style.padding = 0;
body.style.margin = 0;
body.appendChild(iframe);
iframe.style.position = 'fixed';
iframe.style.padding = 0;
iframe.style.margin = 0;
iframe.style.width = '100%';
iframe.style.height = '100%';
iframe.style.border = 0;
}, 0);
// move the iframe back if the popup in closed
win.addEventListener('beforeunload', function () {
document.getElementById('example-container').appendChild(iframe);
iframe.style.position = '';
iframe.style.padding = '';
iframe.style.margin = '';
iframe.style.width = '';
iframe.style.height = '';
iframe.style.border = '';
});
});
Example: http://jsfiddle.net/cpy2jykv/1/

Trouble with iFrame.contentDocument

Basically, im making a javascript to refresh a page and it will find the price and buy the item when it goes up for the price desired.
I got it to work without the iframe, but I need to to work in the iframe, which is the problem ive reached.
If you went to this page: [ http://m.roblox.com/items/100933289/privatesales ]
and ran this code:
alert(document.getElementsByClassName('currency-robux')[0].innerHTML);
You would get an alert for the lowest price. In the code, this doesnt work (Hence, my problem.)
Try running the code below on this page to get it to work [ http://www.roblox.com/Junk-Bot-item?id=100933289 ]
var filePath = document.URL;
var itemid = filePath.slice(((filePath.search("="))+1));
var mobileRoot = 'http://m.roblox.com/items/';
var mobileEnd = '/privatesales';
var mobileFilePath = mobileRoot+itemid+mobileEnd;
var iframe2 = '<iframe id="frame" width="100%" height="1" scrolling="yes"></iframe>';
document.write(iframe2);
var iframe = parent.document.getElementById("frame");
iframe.height = 300;
iframe.width = 500;
iframe.src = mobileFilePath;
var price;
var snipe = false;
var lp = Number(prompt("Snipe Price?"));
document.title = "Sniping";
function takeOutCommas(s){
var str = s;
while ((str.indexOf(",")) !== -1){
str = str.replace(",","");
}
return str;
}
function load() {
if (snipe == false) {
tgs = iframe.contentDocument.getElementsByClassName('currency-robux');
price = Number((takeOutCommas(tgs[0].innerHTML)));
alert(price);
}
}
iframe.onload = load;
You might try having both pages — the one from "m.roblox.com" and the one from "www.roblox.com" — add the following up at the top of the head:
<script>
document.domain = "roblox.com";
</script>
Code from the different domains won't be allowed to look at each others page contents, but if you set the domains to the same suffix then it should work.
If you can't get it to work by sharing the same document.domain="roblox.com" code then you can try posting messages to the iframe.
Put this inside the iframe page:
window.addEventListener('message',function(e) {
});
In the parent page execute this to pass a message (can be a string or object, anything really) to the iframe:
document.getElementById("frame").contentWindow.postMessage({ "json_example": true }, "*");
Put this in the parent to listen for the message:
window.addEventListener("message", messageReceived, false);
function messageReceived(e) {
}
From inside the iframe posting a message back out:
window.parent.postMessage('Hello Parent Page','*');

Javascript object required error in IE

i'm creating mulitple planet objects in javascript to handle animation.
The animation works fine for each planet but i am getting errors in IE 6/7 saying "object required on line 15 char 2"
Code:
var earthObj = null;
var mercObj = null;
var jupiObj = null;
var animate;
function init()
{
mercObj = document.getElementById('mercury');
earthObj = document.getElementById('earth');
jupiObj = document.getElementById('jupiter');
mercObj.style.position= 'relative';
mercObj.style.left = '54px';
mercObj.style.visibility = 'hidden';
earthObj.style.position= 'relative'; //error on this line
earthObj.style.left = '80px';
earthObj.style.top = 300px';
}
Before trying to call an object, test if it exists.
earthObj = document.getElementById('earth');
if(!earthObj) {
alert("Could not find Earth");
return;
}
I am on mac and don't have any IE to try. Do you get the same error, if you change the code like this:
function init() {
var earthObj = null;
var mercObj = null;
var jupiObj = null;
var animate;
mercObj = document.getElementById('mercury');
earthObj = document.getElementById('earth');
jupiObj = document.getElementById('jupiter');
mercObj.style.position= 'relative';
mercObj.style.left = '54px';
mercObj.style.visibility = 'hidden';
!earhtObj && alert("There is no element with id 'earth'");
earthObj.style.left = '80px';
earthObj.style.top = '300px';
earthObj.style.position= 'relative';
}
I came accros this post and thought if the error might be connected with IE6/7 bug that triggers when some global variable gets the same name as dom object.
I also moved the earthObj.style.position= 'relative'; to the end of block and expect the error to reaper at earthObj.style.left = '80px';
I've found that in IE, the function works if the script is after the defined/generated HTML elements.
i.e. place the script at the end of the HTML document, rather at the beginning, or use jquery's ready function:
$(function() {
mercObj = document.getElementById('mercury');
});

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?

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