Using w3css with a pinned navbar (ie enclosed in a with class w3-top) how can I know the height of the navbar (which will vary with screen size) so I can leave this much space at the top of my non-pinned content so the navbar doesn't overwrite content?
My best solution so far is to duplicate the navbar in javascript and insert that at the top of the page without the w3-top class so that there is a hidden element which is always the same size at the top of the page.
...
<div id="pinned_nav" class="w3-top">
<ul class="w3-navbar w3-light-grey w3-border">
<li>
...
<script type="text/javascript">
//Duplicate the nav without pinning it to the top - this means that the other content will adjust to height of pinned nav
var nav = document.getElementById("pinned_nav");
var nav_copy = nav.cloneNode(true);
nav_copy.classList.remove("w3-top");
nav.parentElement.insertBefore(nav_copy, nav);
</script>
...
Since this seemed less error prone than just copy and pasting the HTML block.
But it's still rather clunky and I just wondered if there was a simpler way I was missing.
Other questions like this one which are not w3css specific suggest using a fixed margin to skip a pinned toolbar but I can't see how to determine this margin height with a responsive navbar.
You could use a Javascript script to get the height and append it however you want to use it.
function getHeight() {
var nav = document.getElementById("pinned_nav");
var nav_height = nav.offsetHeight; //append this var where you need to.
alert(nav_height);
};
window.onload = getHeight();
window.onresize = getHeight(); //edit, added for if you resize the page
#pinned_nav {
height: 100px;
/*as example */
background-color: red;
}
<div id="pinned_nav" class="w3-top"></div>
EDT
Added resize event subscription.
When embedding a Bootstrap app in an iframe, modal dialogs always open at the top of the iframe, not the top of the screen. As an example, go to http://getbootstrap.com/javascript/ and open an example modal on the page. Then using the sample code below which places the same bootstrap page in an iframe, find a modal and open it:
<html>
<head>
</head>
<body>
<table width="100%">
<tr><td colspan="2" style="height:80px;background-color:red;vertical-align:top">Here's some header content I don't control</td></tr>
<tr><td style="width:230px;height:10080px;background-color:red;vertical-align:top">Here's some sidebar content I don't control either</td>
<td valign="top">
<iframe width="100%" height="10000px"
scrolling="no" src="http://getbootstrap.com/javascript/">
</iframe>
</td>
</tr>
</table>
</body>
</html>
Demo in fiddle
How do I go about positioning the modal on the screen in this scenario?
UPDATE: Unfortunately, my iFrame cannot fill the screen, nor can I make it fixed since it needs to blend into the rest of the page and the page itself has enough content to scroll. This is not my design and I ultimately intend to rework the whole thing, but this is what I have to work around for now. As a temporary option, I'm using javascript to tell the iframe parent to scroll to the top where the modal dialog pops up. While this is acceptable, this isn't the desired behavior.
I'm using angularjs and the ui-bootstrap library in my code but as you can see above, it's a bootstrap issue.
If your iframe has the same document.domain as the parent window or it is a sub domain, you can use the code below inside the iframe:
$('#myModal').on('show.bs.modal', function (e) {
if (window.top.document.querySelector('iframe')) {
$('#myModal').css('top', window.top.scrollY); //set modal position
}
});
show.bs.modal will fire after you call $('#myModal').show()
window.top.scrollY will get the scrollY position from the parent window
In case your document.domain differs from the parent, you can hack it getting the onmousedown position inside the iframe. For example:
$('#htmlElement').on('mousedown', function (event) {
event.preventDefault();
$('#myModal').data('y', event.pageY); // store the mouseY position
$('#myModal').modal('show');
});
$('#myModal').on('show.bs.modal', function (e) {
var y = $('#myModal').data('y'); // gets the mouseY position
$('#myModal').css('top', y);
});
Quite old question but I don't see the solution/workaround I've found. It might be helpful for someone in the future.
I had the same issue - my iFrame doesn't fill the entire screen, it displays bootstrap's modal and it is loading content from different domain than the parent page.
TL;DR
Use window.postMessage() API - Documentation here. for communication between parent and iframe (cross-domain)
pass message with currentScrollPosition and Y position of your iframe
Reveive message and update modal's padding from the top
In my case the workaround was to use window.postMessage() API - Documentation here.
It requires to add some extra code to the parent and handle message in an iFrame.
You can add EventListener and listen to 'scroll' event. Each time the event handling function is invoked you can get currentScrollPosition like document.scrollingElement.scrollTop.
Keep in mind that your iframe can have some margin from the top in the parent page so you should also get its 'offset'.
After that you can post these two values to your iframe e.g. ncp_iframe.contentWindow.postMessage(message, '*');
Note that the message has to be a String value
After that in your iFrame you need to add EventListener and listen to 'message' event.
The event handling function will pass your 'message' in event.data property. Having that you can update modal padding. (Looks much better if you don't use animations e.g. fade, in classes);
Quick Example:
Parent:
window.addEventListener('scroll', function(event){
var myIframe = document.querySelector('#myIframe');
var topOffset = myIframe.getBoundingClientRect().top + window.scrollY;
var currentScroll = document.scrollingElement.scrollTop;
myIframe.contentWindow.postMessage(topOffset + ':' + currentScroll, '*');
});
iFrame:
window.addEventListener('message', function(event) {
var messageContent = event.data.split(':');
var topOffset = messageContent[0];
var currentScroll = messageContent[1];
//calculate padding value and update the modal top-padding
}, false);
This is a bug in most browsers (IE appears fine) where the elements are fixed to the iframe, not the window. Typically, if you need something to be relative to the main document, it has to be in the main document.
A workaround is to wrap your iframe in a fixed position div that takes up the whole width of the screen and then maximize the iframe within that. This appears to resolve the issue
HTML:
<div class="fixframe">
<iframe src="http://getbootstrap.com/javascript/"></iframe>
</div>
CSS:
.fixframe {
position: fixed;
top: 0px;
left: 0px;
right: 0px;
bottom: 0px;
}
.fixframe iframe {
height: 100%;
width: 100%;
}
Working Demo in fiddle
See Also:
position:fixed inside of an iframe
iframe with a css fixed position : possible?
position fixed div in iframe not working
It is because the class .modal has position: fixed attribute. Try position: relative instead.
I'm trying to display an iframe in my mobile web application, but I'm having trouble restricting the size of the iframe to the dimensions of the iPhone screen. The height and width attributes on the iframe element seem to have no effect, strangely. Surrounding it with a div manages to constrain it, but then I'm unable to scroll within the iframe.
Has anyone tackled iframes in mobile safari before? Any ideas where to start?
Yeah, you can't constrain the iframe itself with height and width. You should put a div around it. If you control the content in the iframe, you can put some JS within the iframe content that will tell the parent to scroll the div when the touch event is received.
like this:
The JS:
setTimeout(function () {
var startY = 0;
var startX = 0;
var b = document.body;
b.addEventListener('touchstart', function (event) {
parent.window.scrollTo(0, 1);
startY = event.targetTouches[0].pageY;
startX = event.targetTouches[0].pageX;
});
b.addEventListener('touchmove', function (event) {
event.preventDefault();
var posy = event.targetTouches[0].pageY;
var h = parent.document.getElementById("scroller");
var sty = h.scrollTop;
var posx = event.targetTouches[0].pageX;
var stx = h.scrollLeft;
h.scrollTop = sty - (posy - startY);
h.scrollLeft = stx - (posx - startX);
startY = posy;
startX = posx;
});
}, 1000);
The HTML:
<div id="scroller" style="height: 400px; width: 100%; overflow: auto;">
<iframe height="100%" id="iframe" scrolling="no" width="100%" id="iframe" src="url" />
</div>
If you don't control the iframe content, you can use an overlay over the iframe in a similar manner, but then you can't interact with the iframe contents other than to scroll it - so you can't, for example, click links in the iframe.
It used to be that you could use two fingers to scroll within an iframe, but that doesn't work anymore.
Update: iOS 6 broke this solution for us. I've been attempting to get a new fix for it, but nothing has worked yet. In addition, it is no longer possible to debug javascript on the device since they introduced Remote Web Inspector, which requires a Mac to use.
If the iFrame content is not yours then the solution below will not work.
With Android all you need to do is to surround the iframe with a DIV and set the height on the div to document.documentElement.clientHeight. IOS, however, is a different animal. Although I have not yet tried Sharon's solution it does seem like a good solution. I did find a simpler solution but it only works with IOS 5.+.
Surround your iframe element with a DIV (lets call it scroller), set the height of the DIV and make sure that the new DIV has the following styling:
$('#scroller').css({'overflow' : 'auto', '-webkit-overflow-scrolling' : 'touch'});
This alone will work but you will notice that in most implementations the content in the iframe goes blank when scrolling and is basically rendered useless. My understanding is that this behavior has been reported as a bug to Apple as early as iOS 5.0. To get around that problem, find the body element in the iframe and add -webkit-transform', 'translate3d(0, 0, 0) like so:
$('#contentIframe').contents().find('body').css('-webkit-transform', 'translate3d(0, 0, 0)');
If your app or iframe is heavy on memory usage you might get a hitchy scroll for which you might need to use Sharon's solution.
This only works if you control both the outside page and the iframe page.
On the outside page, make the iframe unscrollable.
<iframe src="" height=200 scrolling=no></iframe>
On the iframe page, add this.
<!doctype html>
...
<style>
html, body {height:100%; overflow:hidden}
body {overflow:auto; -webkit-overflow-scrolling:touch}
</style>
This works because modern browsers uses html to determine the height, so we just give that a fixed height and turn the body into a scrollable node.
I have put #Sharon's code together into the following, which works for me on the iPad with two-finger scrolling. The only thing you should have to change to get it working is the src attribute on the iframe (I used a PDF document).
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Pdf Scrolling in mobile Safari</title>
</head>
<body>
<div id="scroller" style="height: 400px; width: 100%; overflow: auto;">
<iframe height="100%" id="iframe" scrolling="no" width="100%" id="iframe" src="data/testdocument.pdf" />
</div>
<script type="text/javascript">
setTimeout(function () {
var startY = 0;
var startX = 0;
var b = document.body;
b.addEventListener('touchstart', function (event) {
parent.window.scrollTo(0, 1);
startY = event.targetTouches[0].pageY;
startX = event.targetTouches[0].pageX;
});
b.addEventListener('touchmove', function (event) {
event.preventDefault();
var posy = event.targetTouches[0].pageY;
var h = parent.document.getElementById("scroller");
var sty = h.scrollTop;
var posx = event.targetTouches[0].pageX;
var stx = h.scrollLeft;
h.scrollTop = sty - (posy - startY);
h.scrollLeft = stx - (posx - startX);
startY = posy;
startX = posx;
});
}, 1000);
</script>
</body>
</html>
<div id="scroller" style="height: 400px; width: 100%; overflow: auto;">
<iframe height="100%" id="iframe" scrolling="no" width="100%" src="url" />
</div>
I'm building my first site and this helped me get this working for all sites that I use iframe embededding for.
Thanks!
Sharon's method worked for me, however when a link in the iframe is followed and then the browser back button is pressed, the cached version of the page is loaded and the iframe is no longer scrollable. To overcome this I used some code to refresh the page as follows:
if ('ontouchstart' in document.documentElement)
{
document.getElementById('Scrolling').src = document.getElementById('SCrolling').src;
}
I implemented the following and it works well. Basically, I set the body dimensions according to the size of the iFrame content. It does mean that our non-iFrame menu can be scrolled off the screen, but otherwise, this makes our sites functional with iPad and iPhone. "workbox" is the ID of our iFrame.
// Configure for scrolling peculiarities of iPad and iPhone
if (navigator.userAgent.indexOf('iPhone') != -1 || navigator.userAgent.indexOf('iPad') != -1)
{
document.body.style.width = "100%";
document.body.style.height = "100%";
$("#workbox").load(function (){ // Wait until iFrame content is loaded before checking dimensions of the content
iframeWidth = $("#workbox").contents().width();
if (iframeWidth > 400)
document.body.style.width = (iframeWidth + 182) + 'px';
iframeHeight = $("#workbox").contents().height();
if (iframeHeight>200)
document.body.style.height = iframeHeight + 'px';
});
}
Purely using MSchimpf and Ahmad's code, I made adjustments so I could have the iframe within a div, therefore keeping a header and footer for back button and branding on my page. Updated code:
<script type="text/javascript">
$("#webview").bind('pagebeforeshow', function(event){
$("#iframe").attr('src',cwebview);
});
if (navigator.userAgent.indexOf('iPhone') != -1 || navigator.userAgent.indexOf('iPad') != -1)
{
$("#webview-content").css("width","100%");
$("#webview-content").css("height","100%");
$("#iframe").load(function (){ // Wait until iFrame content is loaded before checking dimensions of the content
iframeWidth = $("#iframe").contents().width();
if (iframeWidth > 400)
$("#webview-content").css("width",(iframeWidth + 182) + 'px');
iframeHeight = $("#iframe").contents().height();
if (iframeHeight>200)
$("#webview-content").css("height",iframeHeight + 'px');
});
}
</script>
and the html
<div class="header" data-role="header" data-position="fixed">
</div>
<div id="webview-content" data-role="content" style="height:380px;">
<iframe id="iframe"></iframe>
</div><!-- /content -->
<div class="footer" data-role="footer" data-position="fixed">
</div><!-- /footer -->
Don't scroll the IFrame page or its content, scroll the parent page. If you control the IFrame content, you can use the iframe-resizer library to turn the iframe element itself into a proper block level element, with a natural/correct/native height. Also, don't attempt to position (fixed, absolute) your iframe in the parent page, or present an iframe in a modal window, especially if it has form elements.
I also suspect that iOS Safari has a non-standards behavior that expands your iframe's height to its natural height, much like the iframe-resizer library will do for desktop browsers, which seem to render responsive iframe content at height 0px or 150px or some other not useful default. If you need to contrain width, try a max-width style inside the iframe.
The solution is to use Scrolling="no" on the iframe.
That's it.
Here's the scenario:
I have an asp.net webpage which displays dynamic data in a gridview.
I'm using a master page to display the header and footer of the page, and this gridview is being displayed inside a div in the contentplaceholder.
The Problem:
What I want is that the size of the page that is displayed remains constant for a user and must be equal to the size of their browser's available display area and the content being visible by scrolling the div.
Sort of like the header and footer remain at the same position and the content inside it is scrollable.
I really don't know how to achieve this.
Any help on the matter is highly appreciated.
Thanks.
Try some jQuery:
function changeHeight(){
var winHeight = $(window).height();
var heightOfHeaderAndFooter = 200px; // change this to what you need
$('#myDiv').height($(window).height() - heightOfHeaderAndFooter);
}
$(window).resize(function() { // changes height with browser window
changeHeight();
});
$(document).ready(function() { // changes height on load of the page
changeHeight();
});
What you want is for your div to use width:auto and to dynamically change the height of it to always keep the footer at the bottom of the page. Also, make sure your div has overflow-y:scroll
Code snippet:
divMain.style.height --> height of div in pixel containing GridView. This div tag also has style setting of style="overflow-y:auto;"
document.documentElement.clientHeight --> height of the working/client area for your display.
document.getElementById("divMain").offsetTop --> height of content prior to divMain.
25 --> this is the height of my additional footer.
The pixel result is the height available for your divMain.
divMain.style.height = (document.documentElement.clientHeight - document.getElementById("divMain").offsetTop - 25) + "px";
Hope this helps.
I want to display my page inside another page via Iframe.
The problem is that the iframe doesn't resize automatically (height).
How can I resize it automatically? Or maybe there is better way to display one page inside another?
Here's one way: http://www.mattcutts.com/blog/iframe-height-scrollbar-example/
If the height of the frame may change after it's loded (e.g. expanding/collapsible regions) then you can set up a polling mechanism to periodically resize the frame in case the size has changed. Like this:
<html>
<head> <title>Parent frame</title> </head>
<body onload="window.setTimeout(resizeFrame, 250)" bgcolor="#cccccc">
<script type="text/javascript">
// Firefox worked fine. Internet Explorer shows scrollbar because of frameborder
function resizeFrame() {
var f = document.getElementById('childframe');
if (f.style.height != f.contentWindow.document.body.scrollHeight + "px")
f.style.height = f.contentWindow.document.body.scrollHeight;
window.setTimeout(resizeFrame, 250)
}
</script>
<p>Parent frame.</p>
<p>Parent frame.</p>
<p>Parent frame.</p>
<p>Parent frame.</p>
<p>
<iframe frameborder=0 src="./innerframe.htm" name="childframe" id="childframe">
</iframe>
</p>
</body>
</html>
Note: I'm assuming that you're using frames because you're pulling content from another domain. If you're pulling content from the same domain, you might be able to simply use script to fetch the content using XmlHttpRequest, and then inject the HTML into a DIV on the parent page. You can't do this if the content lives on a different domain, due to browsers' cross-site scripting limitations.
setInterval(function() {
var ifm = document.getElementById("ifrmeID");
var h = ifm.contentWindow.document.body.scrollHeight;
ifm.height = h < 400 ? 400 : h;
}, 800);
400 is the default height if you didnt want iframe too short,800(ms) is frequency,you can adjust these two values. put the js in the end of your page which contained iframe .then it will be ok.