How can I place a Bootstrap modal at the top of an iframe, no matter the scroll position, and position it correctly on the

Question

How can I place a Bootstrap modal at the top of an iframe, no matter the scroll position, and position it correctly on the

When incorporating a Bootstrap application into an iframe, modal dialogs consistently appear at the top of the iframe rather than the top of the screen. To illustrate, visit http://getbootstrap.com/javascript/ and open a modal example on the page. Then utilize the sample code below which embeds the same bootstrap page in an iframe, locate 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>

View demo in fiddle

What steps should I take to position the modal on the screen under these circumstances?

UPDATE: Unfortunately, my iFrame is unable to cover the entire screen, nor can it be fixed due to the need for it to blend seamlessly with the rest of the page that contains enough content to require scrolling. While this design is not mine and I plan to overhaul it eventually, it is what I have to work with for now. As a temporary workaround, I am using JavaScript to instruct the parent frame of the iframe to scroll to the top when the modal dialog is triggered. Although functional, this solution is not ideal.

I am utilizing angularjs and the ui-bootstrap library in my code, but as shown above, this issue stems from Bootstrap.

css angularjs twitter-bootstrap iframe css-position

Answer 1

Answer №1

If your iframe shares the same document.domain with the parent window or if it is a sub domain, you can incorporate the following code within the iframe:

    $('#myModal').on('show.bs.modal', function (e) {
        if (window.top.document.querySelector('iframe')) {
            $('#myModal').css('top', window.top.scrollY); //adjust modal position
        }
    });

show.bs.modal will be triggered after calling $('#myModal').show() window.top.scrollY will retrieve the scrollY position from the parent window

If your document.domain differs from the parent, you can utilize a workaround by capturing the onmousedown position inside the iframe. For instance:

$('#htmlElement').on('mousedown', function (event) {
    event.preventDefault();
    $('#myModal').data('y', event.pageY); // save the mouseY position
    $('#myModal').modal('show');
});
$('#myModal').on('show.bs.modal', function (e) {
    var y = $('#myModal').data('y'); // fetches the mouseY position
    $('#myModal').css('top', y);
});

Answer 2

If your iframe shares the same document.domain with the parent window or if it is a sub domain, you can incorporate the following code within the iframe:

    $('#myModal').on('show.bs.modal', function (e) {
        if (window.top.document.querySelector('iframe')) {
            $('#myModal').css('top', window.top.scrollY); //adjust modal position
        }
    });

show.bs.modal will be triggered after calling $('#myModal').show() window.top.scrollY will retrieve the scrollY position from the parent window

If your document.domain differs from the parent, you can utilize a workaround by capturing the onmousedown position inside the iframe. For instance:

$('#htmlElement').on('mousedown', function (event) {
    event.preventDefault();
    $('#myModal').data('y', event.pageY); // save the mouseY position
    $('#myModal').modal('show');
});
$('#myModal').on('show.bs.modal', function (e) {
    var y = $('#myModal').data('y'); // fetches the mouseY position
    $('#myModal').css('top', y);
});

Answer 3

Answer №2

This question may be old, but I have discovered a solution/workaround that could prove useful for others in the future.

I encountered a similar problem where my iframe was not filling the entire screen within a bootstrap modal and was loading content from a different domain than the parent page.

Summary:

Utilize the window.postMessage() API - check out the documentation here for cross-domain communication between parent and iframe.
Send messages containing the current scroll position and Y position of your iframe.
Receive these messages and update the modal's padding accordingly.

In my case, using the window.postMessage() API as a workaround proved effective. This involved adding additional code to the parent and handling messages in the iframe.

Add an EventListener to listen for 'scroll' events. Upon each invocation of the event handler function, retrieve the current scroll position using

document.scrollingElement.scrollTop

. Remember to also account for any offset your iframe may have from the top of the parent page. Then, post these values to the iframe like so:

ncp_iframe.contentWindow.postMessage(message, '*');

Note: The message must be a String value.

In your iframe, add an EventListener to listen for 'message' events. The event handling function will access your 'message' via the event.data property. With this information, you can then update the modal's padding. (For best results, avoid using animations such as fade or in classes.)

Here is a 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);

Answer 4

This question may be old, but I have discovered a solution/workaround that could prove useful for others in the future.

I encountered a similar problem where my iframe was not filling the entire screen within a bootstrap modal and was loading content from a different domain than the parent page.

Summary:

Utilize the window.postMessage() API - check out the documentation here for cross-domain communication between parent and iframe.
Send messages containing the current scroll position and Y position of your iframe.
Receive these messages and update the modal's padding accordingly.

In my case, using the window.postMessage() API as a workaround proved effective. This involved adding additional code to the parent and handling messages in the iframe.

Add an EventListener to listen for 'scroll' events. Upon each invocation of the event handler function, retrieve the current scroll position using

document.scrollingElement.scrollTop

. Remember to also account for any offset your iframe may have from the top of the parent page. Then, post these values to the iframe like so:

ncp_iframe.contentWindow.postMessage(message, '*');

Note: The message must be a String value.

In your iframe, add an EventListener to listen for 'message' events. The event handling function will access your 'message' via the event.data property. With this information, you can then update the modal's padding. (For best results, avoid using animations such as fade or in classes.)

Here is a 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);

Answer 5

Answer №3

Most browsers have a glitch (IE seems to be an exception) where elements are fixed to the iframe rather than the window. If you want something to be relative to the main document, it should be within that document.

A workaround is to enclose your iframe in a div with a fixed position that spans the entire width of the screen and then maximize the iframe inside it. This solution seems to fix the problem.

Code Snippet:

<div class="fixframe">
    <iframe src="http://getbootstrap.com/javascript/"></iframe>
</div>

CSS Styling:

.fixframe {
    position: fixed;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;    
} 
.fixframe iframe {
   height: 100%;
   width: 100%;  
}

Working Example on Fiddle

Additional Resources:

Fixing position:fixed inside an iframe
Can iframes use css fixed positioning?
Why isn't a fixed position div working inside an iframe?

Answer 6

Most browsers have a glitch (IE seems to be an exception) where elements are fixed to the iframe rather than the window. If you want something to be relative to the main document, it should be within that document.

A workaround is to enclose your iframe in a div with a fixed position that spans the entire width of the screen and then maximize the iframe inside it. This solution seems to fix the problem.

Code Snippet:

<div class="fixframe">
    <iframe src="http://getbootstrap.com/javascript/"></iframe>
</div>

CSS Styling:

.fixframe {
    position: fixed;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;    
} 
.fixframe iframe {
   height: 100%;
   width: 100%;  
}

Working Example on Fiddle

Additional Resources:

Fixing position:fixed inside an iframe
Can iframes use css fixed positioning?
Why isn't a fixed position div working inside an iframe?

Answer 7

Answer №4

The reason for this issue is due to the .modal class containing the position: fixed attribute. You may want to consider using position: relative as an alternative solution.

Answer 8

The reason for this issue is due to the .modal class containing the position: fixed attribute. You may want to consider using position: relative as an alternative solution.

How can I place a Bootstrap modal at the top of an iframe, no matter the scroll position, and position it correctly on the

Answer №1

Answer №2

Answer №3

Working Example on Fiddle

Answer №4

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