Why I am using this editor:
In the past I used PrimeFaces p:editor which is however deprecated and lacks functions that the users desperately want. I cannot use the new PrimeFaces p:textEditor because of this: Primefaces textEditor: converting text to HTML with JavaScript not working.
What is it used for:
I am using pe:ckEditor from PrimeFaces Extensions in my program, in which the editor is used by the user to create an e-mail message content. Then by click on a send button, the HTML from the editor is taken and sent via e-mail to a client.
What is the issue:
When using p:editor, I got the HTML by JavaScript function saveHTML and it worked perfectly even when the text contained Czech characters (ěščřžýáíéó), I did not even have to set enconding or anything else and it worked.
Now however when user writes "V případě dalších dotazů se na nás můžete obracet každý den na telefonním čísle", the gotten HTML has the text like this:"V pÅípadÄ dalších dotazů se na nás můžete obracet každý den na telefonním Äísle" - complete rubbish that the user obviously cannot send to a client...
My research:
EDIT: Based on some comments, I tried to add the <meta charset="utf-8> and <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> but that did not help. In pom.xml I have found also this <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>, so I do not think that there is a problem in the HTML page, but in settings of the editor itself...
So I figured, that the encoding must be set especially for the editor in its config. I finally figured how to make the editor access the custom config, but nothing that I found on the Internet and added to the config worked for me:
config.language='cs';
And:
config.entities_latin = false;
And:
config.entities = false;
And:
config.basicEntities = false;
And all its combinations.
ANOTHER EDIT:
Based on some other comments here, I also installed OmniFaces and tried to solve this by CharacterEncodingFilter, but nothing changed and it is still not working.
I also found out that my problem seems to be very related to this issue: Unicode input retrieved via PrimeFaces input components become corrupted, but the accepted answer there gives 3 ways how to solve it, one is the CharacterEncodingFilter, other way is not applicable for Tomcat users (me) and the last "solution" seems to be reporting this to PrimeFaces Extensions developers (which I did: https://github.com/primefaces-extensions/primefaces-extensions.github.com/issues/756 ).
Please let me know if you know how to fix this or if there is any workaround.
PrimeFaces Extensions - version 7.0.2;
PrimeFaces - version 7.0.7
I and my colleague found out what the issue was based on the test code that #melloware provided.
The original editor p:editor, which we had been using and which we are trying to replace by pe:ckEditor, could provide us with its content in HTML only in case we used JavaScript function saveHTML.
But with pe:ckEditor, anytime the user hit the Send button, whose onstart contained the saveHTML, the saveHTML corrupted the content. Once we erased the saveHTML and took the pe:ckEditor content as it was (which is already in HTML), it was fine without corrupted characters.
I've tried all the troubleshooting suggestions, and I've got iFrameResizer working on other sites without any issues, but it's snagging on this one and I can't fathom out why. Weirdly, it works on the details page, but not on the listing page. Logging returns the
"hasn't responded in 5 seconds" message.
I've also tried all the various triggers ('max' etc.) none of them make a difference.
Example page where it doesn't work:
http://www.homesinfocus.co.uk/properties-to-let/
But on the details page, it does work:
http://www.homesinfocus.co.uk/property-details-let/?ID=790&LB=Let
I've made sure all the iFrames have unique IDs, and the listing page works okay for other sites, just can't see where the issue is with this one.
Any pointers would be much appreciated.
David, thanks for your help. CheckOrigin seems to have fixed it.
Seems to work fine with the following:
<script>
$(window).on('load', function (e) {
$('iframe').iFrameResize({checkOrigin:false});
});
</script>
The most common reason for that, is that the iframe hasn't loaded it's js file.
Also check that your using the very latest version, as the error message gives a bit more detail.
When I set response content type as Excel, the Open/Save dialog is shown twice , just on IE8. It works fine on other browsers (tested on Chrome/Firefox/Opera).
The code for setting response content type is:
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition","attachment;filename=abc.xls");
I searched for solutions/workarounds. Turning off Smartscreen didn't help.
Also, another suggestion was to wait for 5-10 sec before clicking Save/Open. That too didn't work.
What's the cause of this? Are there any IE specific workarounds?
It's a pain but IE8 is still widely used by the users.
This is just a guess, but it could have something to do with the way Office (used to) embed itself in IE with plugins.
A workaround might be putting it in a zip file before sending it over to the user.
I ran into a curious issue today. We have a web page that hides the body via CSS and then there's a bit of JavaScript that sets the body to display: block to show it. (This is part of some iFrame busting logic we are required to add).
We were having issues on one page but only in Safari. In taking a look at things, I found that the culprit was that an include file was being called that contained its own body tag so we were ending up with malformed HTML with a body tag nested within the pages existing body tag.
Since the JS was looking for the first body tag the content we actually wanted to show was never shown, since it was wrapped with the second body tag.
I assume Firefox was just forgiving of the HTML and ignored the second body tag. Safari didn't do this when we looked at the page on the server.
However, if I grab the file and run it locally, Safari does tell me:
Extra <body> encountered. Migrating attributes back to the original <body> element and ignoring the tag.
I'm curious as to why Safari might have adopted this 'policy' of ignoring bad HTML locally but not from a server. If it matters, it is an https site we're hitting. Perhaps Safari is being wise and trying to avoid any potential security issues with allowing bad HTML?
How do you prevent Firefox and Safari from caching iframe content?
I have a simple webpage with an iframe to a page on a different site. Both the outer page and the inner page have HTTP response headers to prevent caching. When I click the "back" button in the browser, the outer page works properly, but no matter what, the browser always retrieves a cache of the iframed page. IE works just fine, but Firefox and Safari are giving me trouble.
My webpage looks something like this:
<html>
<head><!-- stuff --></head>
<body>
<!-- stuff -->
<iframe src="webpage2.html?var=xxx" />
<!-- stuff -->
</body>
</html>
The var variable always changes. Although the URL of the iframe has changed (and thus, the browser should be making a new request to that page), the browser just fetches the cached content.
I've examined the HTTP requests and responses going back and forth, and I noticed that even if the outer page contains <iframe src="webpage2.html?var=222" />, the browser will still fetch webpage2.html?var=111.
Here's what I've tried so far:
Changing iframe URL with random var value
Adding Expires, Cache-Control, and Pragma headers to outer webpage
Adding Expires, Cache-Control, and Pragma headers to inner webpage
I'm unable to do any JavaScript tricks because I'm blocked by the same-origin policy.
I'm running out of ideas. Does anyone know how to stop the browser from caching the iframed content?
Update
I installed Fiddler2 as Daniel suggested to perform another test, and unfortunately, I am still getting the same results.
This is the test I performed:
Outer page generates random number using Math.random() in JSP.
Outer page displays a random number on the webpage.
Outer page calls iframe, passing in a random number.
Inner page displays a random number.
With this test, I'm able to see exactly which pages are updating, and which pages are cached.
Visual Test
For a quick test, I load the page, navigate to another page, and then press "back." Here are the results:
Original Page:
Outer Page: 0.21300034290246206
Inner Page: 0.21300034290246206
Leaving page, then hitting back:
Outer page: 0.4470929019483644
Inner page: 0.21300034290246206
This shows that the inner page is being cached, even though the outer page is calling it with a different GET parameter in the URL. For some reason, the browser is ignoring the fact that the iframe is requesting a new URL; it simply loads the old one.
Fiddler Test
Sure enough, Fiddler confirms the same thing.
(I load the page.)
Outer page is called. HTML:
0.21300034290246206
<iframe src="http://ipv4.fiddler:1416/page1.aspx?var=0.21300034290246206" />
http://ipv4.fiddler:1416/page1.aspx?var=0.21300034290246206 is called.
(I navigate away from the page and then hit back.)
Outer page is called. HTML:
0.4470929019483644
<iframe src="http://ipv4.fiddler:1416/page1.aspx?var=0.4470929019483644" />
http://ipv4.fiddler:1416/page1.aspx?var=0.21300034290246206 is called.
Well, from this test, it looks as though the web browser isn't caching the page, but it's caching the URL of the iframe and then making a new request on that cached URL. However, I'm still stumped as to how to solve this issue.
Does anyone have any ideas on how to stop the web browser from caching iframe URLs?
This is a bug in Firefox:
https://bugzilla.mozilla.org/show_bug.cgi?id=356558
Try this workaround:
<iframe src="webpage2.html?var=xxx" id="theframe"></iframe>
<script>
var _theframe = document.getElementById("theframe");
_theframe.contentWindow.location.href = _theframe.src;
</script>
I have been able to work around this bug by setting a unique name attribute on the iframe - for whatever reason, this seems to bust the cache. You can use whatever dynamic data you have as the name attribute - or simply the current ms or ns time in whatever templating language you're using. This is a nicer solution than those above because it does not directly require JS.
In my particular case, the iframe is being built via JS (but you could do the same via PHP, Ruby, whatever), so I simply use Date.now():
return '<iframe src="' + src + '" name="' + Date.now() + '" />';
This fixes the bug in my testing; probably because the window.name in the inner window changes.
As you said, the issue here is not iframe content caching, but iframe url caching.
As of September 2018, it seems the issue still occurs in Chrome but not in Firefox.
I've tried many things (adding a changing GET parameter, clearing the iframe url in onbeforeunload, detecting a "reload from cache" using a cookie, setting up various response headers) and here are the only two solutions that worked from me:
1- Easy way: create your iframe dynamically from javascript
For example:
const iframe = document.createElement('iframe')
iframe.id = ...
...
iframe.src = myIFrameUrl
document.body.appendChild(iframe)
2- Convoluted way
Server-side, as explained here, disable content caching for the content you serve for the iframe OR for the parent page (either will do).
AND
Set the iframe url from javascript with an additional changing search param, like this:
const url = myIFrameUrl + '?timestamp=' + new Date().getTime()
document.getElementById('my-iframe-id').src = url
(simplified version, beware of other search params)
After trying everything else (except using a proxy for the iframe content), I found a way to prevent iframe content caching, from the same domain:
Use .htaccess and a rewrite rule and change the iframe src attribute.
RewriteRule test/([0-9]+)/([a-zA-Z0-9]+).html$ /test/index.php?idEntity=$1&token=$2 [QSA]
The way I use this is that the iframe's URL end up looking this way: example.com/test/54/e3116491e90e05700880bf8b269a8cc7.html
Where [token] is a randomly generated value. This URL prevents iframe caching since the token is never the same, and the iframe thinks it's a totally different webpage since a single refresh loads a totally different URL :
example.com/test/54/e3116491e90e05700880bf8b269a8cc7.html
example.com/test/54/d2cc21be7cdcb5a1f989272706de1913.html
both lead to the same page.
You can access your hidden url parameters with $_SERVER["QUERY_STRING"]
To get the iframe to always load fresh content, add the current Unix timestamp to the end of the GET parameters. The browser then sees it as a 'different' request and will seek new content.
In Javascript, it might look like:
frames['my_iframe'].location.href='load_iframe_content.php?group_ID=' + group_ID + '×tamp=' + timestamp;
I found this problem in the latest Chrome as well as the latest Safari on the Mac OS X as of Mar 17, 2016. None of the fixes above worked for me, including assigning src to empty and then back to some site, or adding in some randomly-named "name" parameter, or adding in a random number on the end of the URL after the hash, or assigning the content window href to the src after assigning the src.
In my case, it was because I was using Javascript to update the IFRAME, and only switching the hash in the URL.
The workaround in my case was that I created an interim URL that had a 0 second meta redirect to that other page. It happens so fast that I hardly notice the screen flash. Plus, I made the background color of the interim page the same as the other page, and so you notice it even less.
It is a bug in Firefox 3.5.
Have a look..
https://bugzilla.mozilla.org/show_bug.cgi?id=279048
I set iframe src attribute later in my app. To get rid of the cached content inside iframe at the start of the application I simply do:
myIframe.src = "";
... somewhere in the beginning of js code (for instance in jquery $() handler)
Thanks to
http://www.freshsupercool.com/2008/07/10/firefox-caching-iframe-data/
I also had this problem in 2016 with iOS Safari. What seemed to work for me was
giving a GET-parameter to the iframe src and a value for it like this
<iframe width="60%" src="../other/url?cachebust=1" allowfullscreen></iframe>
I also met this issue, after trying different browsers, and a ton of trial and error, I came up with this solution, which works well in my case:
import { defineComponent } from 'vue'
import { v4 as uuid } from 'uuid'
export default defineComponent({
setup() {
return () => (
// append a uuid after `?` to prevent browsers from caching it
<iframe src={`https://www.example.com?${uuid()}`} frameborder='0' />
)
},
})
If you want to get really crazy you could implement the page name as a dynamic url that always resolves to the same page, rather than the querystring option?
Assuming you're in an office, check whether there's any caching going on at a network level. Believe me, it's a possibility. Your IT folks will be able to tell you if there's any network infrastructure around HTTP caching, although since this only happens for the iframe it's unlikely.
Have you installed Fiddler2?
It will let you see exactly what is being requested, what is being sent back, etc. It doesn't sound plausible that the browser would really hit its cache for different URLs.
Make the URL of the iframe point to a page on your site which acts as a proxy to retrieve and return the actual contents of the iframe. Now you are no longer bound by the same-origin policy (EDIT: does not prevent the iframe caching issue).