So sánh iframe với modal popup

I'm working on a Facebook campaign that is presented in a tab. Facebook.com loads the campaign within an iFrame. The campaign is build using Bootstrap 3.

I'd like to position a modal horizontally and vertically centered in respect to the visible viewport of the iFrame to make sure the user sees the modal. However the height of the iFrame is constantly reset by Facebook using a JS script called AutoGrow(). In that way the content within the iFrame can reload with AJAX and so removes the possibility of a double scrollbar (one for Facebook.com, one for the iFrame).

In order to get the modal which is in the iFrame centered to the user, the script:

• needs to know if the iFrame is visible to the screen, if so
• the height of the visible part of the iFrame

I found a code snippet that gives an idea, however this code uses the total height of the document, not the visible part of an iFrame. http://codepen.io/shshaw/pen/gEiDt

I wonder if vertically centering within an iFrame's viewport can be done.

1 Answer

Allright, found Facebook provides you with information about the parent frame, which makes it possible to center a modal within the Facebook iFrame: https://developers.facebook.com/docs/reference/javascript/FB.Canvas.getPageInfo

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