I want to place a div above an iframe with flash content (for example like a youtube video).
I do not have access to the content in the iframe, so I can't modify something in there.
I've tried a lot of things (z-index... everything).
But nothing works. I am only asking because I really can't find a solution :(
The problem is that the iframe contains the flash content.
I can't really help with a tested solution I'm afraid, as I don't have any flash files to test creating an answer with, but I can tell you why this is happening.
Flash is a browser plugin, which means flash movies are never really part of the HTML document. Instead what happens is the area of the page is reserved for the plugin to run in, which is then invoked and runs 'on top' of the page. Therefore setting z-index on other elements will never actually solve the problem, no matter what combination you try.
However, there is a 'magic' parameter / attribute you can set on the elements themselves that the plugin recognises, called "wmode". If you set this parameter / attribute to 'transparent', the Flash plugin allows some HTML elements to show through, giving the illusion that they are on top of the Flash movie.
If you're able to contact the owner of the iframe to set the wmode parameter to transparent, I'd suggest doing that. If this is a youtube or vimeo embed, see if there's any documentation or options on adding the parameter yourself.
Failing that there's not a lot you can do, as even JavaScript won't be your friend here (you can't modify the contents of a frame with JS for security reasons)
EDIT:
Just remembered, if there's a way of you using HTML5 video instead of Flash, that would help. HTML5 videos are rendered as part of the Document Object Model, and therefore are controllable through the z-index property.
Neal
Related
I have a single page using CSS columns that reflows on load.
Even when I remove all IMGs and iFrames, so it is fetching no
external resources, it reflows.
I can't figure out what is causing the reflow/repaint. Any CSS exports
out there able to figure this one out?
https://github.com/treenotation/dumbdown/issues/8
There's too much content in document.
The browser will gradually display the content, that is, the content involved in rendering will gradually increase, which affects the layout calculation.
You can add the "loading state" style. When window.onload Event trigger, change the style to "load complete".
Or 'Masonry Layout'.
Reason for the reflow is: a huge amount of content but NO strategy to handle with. Indeed there are many things you can avoid/do/change ...
REASON WHY - just to base the answer ...
The reflow is caused by the mechanic: at first the text (html code) has been downloaded and rendered. But there are still a lot of elements (most over images but youtube videos and iframes as well) which are still on download. As the browser don't know the size of that elements he does not keep the place for that elements.
Now: after the download and rendering of every element has finished the browser injects the element to the content and all off the following content is pushed down and in your case to next column ... reflow.
STRATEGY: MULTIPLE ACTIONS
To your question: there is not only one reason which causes multiple and long downloads. So far there is no simple single answer and even NOT A SINGLE SOLUTION. Your needed strategy will be to optimize the page by a multiple bundle of actions. But I believe doing that you can reduce it to an acceptable amount ... and maybe there is a chance.
THINGS YOU CAN DO
1. Change layout
If you change the layout to an actual web technique. That means don't use columns (flowing left to right) to a style which prepares the pageflow from up to down. Than you can asynchron load the needed elements when the user scrolls down. The technique is named Infinite scrolling: How to do an infinite scroll in plain Javascript
But I assume as the special layout has charm this won't be an option for you!?
2. Images which are not shown - remove not needed elements from download
On your page I found images which are downloaded but which are not shown on the page. (Example: 3.png with INCREDIBILE USELESS 659KB). Remove such elements from your content.
3. Reduce not needed size of elements
Additional a lot of shown images on your page have an incredibly large file size which is not needed.
Example: devices.png
image-size: 692x285px - real size
layout-size: 287x118px - needed size
file-size-download: 110kb
file-size-needed: 4kb - if (lossless) optimized
And think about: many little file downloads add up to a big amount ... and you have a lot of downloads! If you calculate: 10 images your way: 1.1 MB can be done with 40KBs
Additional:
if you you need higher solutions use srcset attributes ...
sometimes that is a practical problem with the knowledge of the editors: than teach them how to lossless reduce images and advise them the sizes to use for the images in the layout
4. Use faster server for images
It seems the download rate from your server is not the fastest one. That's normal by most providers. As you have a lot of images ... think about to load images from a faster server - if possible. Example: the pure download service from AWS (Amazon Web Service) is incredibly fast. As you just need a bucket for downloading that is not as expensive ... try it out.
5. Use placeholders for elements
As you have a lot of elements I think you maybe cannot avoid the later injection which causes the reflow. But you can use placeholders for your element so the needed place is reserved and the reflow still does not happen for this element.
Just define the html structure and possible sizes in your layout. That additional helps the editors as they know what image size they can use. Then size the placeholders with CSS and initiate an ajax image download by JS.
In case of later download now the users maybe see a placeholder at the beginning but no reflow. You can do that with few lines of code. I attach an example at the end of the posting.
NOTE: You can do this with (youtube-)videos or iframes in a similar way ;-)
6. Use vanilla instead of jQuery
As I saw has the download of jQuery an incredible impact to your download time. Really. (That's the reason why I assume your server is a slower one.) Have a look to the download time of your elements. It is one of the elements which needs the most times and blocks your elements from rendering.
jQuery is an old dog. Modern web techniques use vanilla JS ... and as I see there are no complicated things on your page you cannot realize in vanilla. So the recommendation is to remove it from you page (if possible) and you will earn a huge speed advantage.
7. Use CDNs for download when possible
Downloading frameworks and fonts from own server makes pages slow and blocks time for the page download of other elements. Use a CDN instead.
As I have seen your fonts are loaded from a CDN? But jQuery still comes from your server. If you don't want to change to vanilla chose to load it from CDN.
8. Check if Youtube can be loaded more simple
Youtube is loaded by several actions to your page. In this case I AM NOT SURE as I still did not work with youtube for a longer time. But I believe (not sure if I am right) that there is a more direct way to include youtube videos to a page. Maybe you would like to check it.
But nevertheless: work with placeholders for the video players as well. That are almost just few additional lines off css.
9. Optimizing user experience: thinking about a preloader
Reflow is not new phenomenon to webpages. Up to now a lot of pages uses preloaders to generate a better user experience. Today's technique is ajax load...
I don't know if the described techniques will avoid the reflow completely. As there are many elements the download time cannot be set to zero. But optimizing the page will reduce it dramatically. If there still remains a little bit ... maybe you like to think about the older technique. Using a nice and maybe well designed preloader symbol indeed can upgrade the user experience. Maybe on mobile views with medium data speed there is no other chance...?
But that is just to think about an additional possibility ...
[update]
10. Combine placeholder with infinite scroll
If you are using placeholders you can/should combine it with technique infinite scroll.
Means: all media (particularly images but maybe videos and iframes as well) are prepositioned by sized placeholders. That works immediately so there should be no more reflow as needed. Then load media assynchron by AJAX based on their position on their screen. Images which are in view are loaded immediately.
As you don't have so many media elements on starting viewport (most are still below the screen view) that should work as if it is a page with a 'normal number' of pictures/medias.
All others are loading afterwards when scrolling the page the media comes in view like on a 'infinite scroll page'. (Note: that works if the file size off the images is not to large, - so optimizing the images has still to be done.)
That has the additional advantage that thake makes sure that the images are loaded in the sequence they are needed ... which safes a lot of time.
Could be done in javascript:
Place images/media by placeholder technique
On window.onload check which images/media are in the viewport. Don't forget images which are only partly seen.
On window.onscroll check if image(s) comes to viewport and load image
Note: I am not quite sure if there are anchor links on your page to the single articles. I believe not. But if you still use them the starting viewport can be anywhere on the page when the user call an article. In that case window.onscroll has not only to work scrolling down but scrolling up to.
I am not quite sure if there is a ready script avaiable. But I would wonder if not. Otherwise it would not be to tricky to do that on your own. That would have the charm that such scripts mostly have less and cleaner code than preworked scripts ...
[end update]
... ... ...
I am not quite sure if the described issues are complete. Mostly there are found more possibilities to optimize a page when you start with the process. But as I had a nearer look to your page that are the most important chances.
EXAMPLE LAZY IMAGE LOAD WITH PLACEHOLDER EFFECT
Just EASY AND SIMPLIFIED example for lazy image load. Please adapt to your need.
// new html for image
<img class="placeholder-size" src="path/placeholder.jpg" data-lazy-url="https://url-to-your/imag.png" alt="Image Description">
// css
.placeholder-size {
width: 200px;
height: 100px;
}
// js for lazy load
// older code but works, please actualize if needed
window.onload = function(){
var lazyImages = document.querySelectorAll('[data-lazy-url]');
for (var i in lazyImages) if (lazyImages.hasOwnProperty(i)) {
var imgUrl = lazyImages[i].getAttribute('data-lazy-url');
lazyImages[i].src=imgUrl;
};
};
For some reason whenever I go to the page of my website that has the crystal report on it my main navigation bar disappears. Here is what the header for the site (with the navigation menu) is suppose to look like:
and here is what it looks like when there is a report on the page:
Could someone tell me what is causing this and how I can fix it?
I'm using master page for the header by the way.
Greener, the Crystal Report viewer is a dynamic HTML representation of the report. It combines JavaScript, HTML and CSS (duh, what doesn't) to represent your report on the webpage. The toolbars are powered by JavaScript calls to .JS that is linked in when the CrystalReportViewer control is rendered to your page.
My point is, all of this introduces a LOT of stuff that can conflict with your existing page. In particular JavaScript errors can occur (which can cause certain things to stop rendering) OR CSS the report uses happens to apply styles you never intended to have applied to objects in your page.
I highly recommend installing the Web Developer toolbar and/or FireBug to FireFox, IE, or whatever browser they are offered on these days. FireFox's implementation of those is quite good in my experience.
When the page loads you can use the 'CSS' menu of the Web Developer toolbar to actually disable some or ALL the styles applied to the page. If disabling Crystal related styles (or all) makes your missing toolbar appear, then it's probably a conflict in your CSS. A front end developer would know to adjust the styles (i.e. add the !important directive to a style, change class/id names, etc.) to address this.
Alternatively, FireBug may be reporting JavaScript errors (heck, even FireFox can show these in the console) which could indicate a problem that prevents the completion of rendering your toolbar.
An outside possibility is that the report itself contains mark-up. For example, if you had certain fields in the report contain HTML that happened to be rendered by the browser, this could create an open div tag, css styles and even JavaScript that would do all the stuff I explained above.
I hope this narrows it down for you. Happy troubleshooting!
I was having the same issue and after hours of searching I finally resolved it... check this out... http://scn.sap.com/thread/1926659
In the crystalreportviewer css file, I adjusted the div class = clear and changed the height attribute and disabled overflow:hidden. Hopefully, that works for you. Good luck!
I found the solution after searching on the web and is a quite simple.
On the Site Master, change the Name for all the places you have the style "clear" for example "clear1" and change it too en the site.css with that name.
The problem is for the conflic with the namespaces with Crystal Report css.
Hope this help.
I use display advertising on my site and I noticed certain expandable ads (ads that expand when you roll over them) changes some of the elements on my page by adding the code "visibility: hidden" as inline CSS. This results in text boxes and other content disappearing when the ad loads. Other than simply disabling the offending ad (not a good solution since I never know what other ads might be causing problems or not), is there a way to block ads from injecting CSS instructions into my site like this? Any advice appreciated!
It's likely the flash add is using the ExternalInterface feature in flash to pipe javascript to your page:
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/external/ExternalInterface.html
The easiest way to make sure this doesn't happen is to set allowScriptAccess to false on your object tag where the ad is embedded:
http://kb2.adobe.com/cps/164/tn_16494.html
If you need the functionality that require allowScriptAccess (navigateToUrl comes to mind) then things get a little bit more complicated :-)
I've just created a tshirt shop to put on my own website. A company called spreadshirt.co.uk (hereafter "SS") runs the shop. They allow me to embed their shop on my site via an iframe, and since they allow the CSS to be fully customisable through their admin panel I've got it looking pretty neatly integrated with my site.
The only catch is the iframe - I've set it to 2000 pixels high at the moment (just right for the longest pages). I'd rather have it resize for each page, but expect that to be "hard" so didn't bother.
Anyway, I've just put the page live, and put a test order through it. All is good, until....
...the "Verified by VISA" page. This motherhubbard turns up right at the end of the order process, and the HTML contained in it puts the little dialogue centred vertically in my iframe. I.e. nearly 1000 pixels down from the top - making less savy users think the page hasn't loaded (all they can see without scrolling down is a white background). I can't customise the CSS on this page like I can the SS pages, as this page isn't served up by SS.
Any clever ideas???
Many thanks people!
I'll put a link to my site if people want to see it, but assumed that might be seen as spammy and frowned upon.
I don't deal with iframes too much as i hate them, but i think you can still write to that document using javascript. Reason i say maybe is because its cross domain, but it should still work.
Check this post out
Resizing an iframe based on content
You could also check out
Resizing iframe to fit its content
and a jquery script:
http://www.lost-in-code.com/programming/jquery-auto-iframe-height/
Again, I really don't know if this will work on a cross-domain website.
Please don't poke me for using IE6 but that's a client's requirement.
My question is, I have an EMBED tag that displays a PDF dynamically depending on the user choice which means the first time the page gets rendered there won't be any EMBED tags but will be when the user picks a choice.
The problem seems to be that when the EMBED tag is flushed to the client side either the container DIV is not expanding enough to accommodate the EMBED tag or the EMBED tag is getting lost somewhere (as if).
On Firefox the EMBED does show-up (even though it's not the desired size) but on IE6 the EMBED is not visible at all (even though it's in the page source). I tried the container DIV to a fixed height (1200px) but didn't help.
The DOM hierarchy is something of,
container DIV
contains another container DIV that set to float
EMDED tag is within the floated container
Do you see any obvious issues with this model?
Greatly appreciated your help.
Note: It's an ASP.NET app (I don't know if it matters given the messy control ID's it create automatically)
IE does not support <embed> at all. You have to use an <object> to embed plugins for IE. As usual there are issues with embedding markup, but I think this would be a place to start:
<object type="application/pdf" data="something.pdf" width="(x)" height="(y)">
<param name="src" value="something.pdf">
</object>
But I'd advise against trying to embed PDF. Some people (including myself) absolutely hate reading a PDF squashed inside the browser. It also requires the user to have a PDF plugin, which is another potentially-insecure piece of net-facing code; PDF reader exploits have been one of the most widespread web attacks over the past year.
Providing a plain PDF link in addition to or instead of the embed will allow you to reach more users, and let them decide themselves whether to download or view the PDF in the browser.