Detect when an iframe is displayed

vtloc

Currently, my website is being embedded in another website. But the problem is I want to know when my iframe is displayed so I can execute some script.

Similar to the following:

<div id="wrapper">
  <iframe id="page1">
       <!-- MY PAGE 1 CODE GOES HERE-->
  </iframe>
  <iframe id="page2">
       <!-- MY PAGE 2 CODE GOES HERE-->
  </iframe>
  <iframe id="page3">
       <!-- MY PAGE 3 CODE GOES HERE-->
  </iframe>
</div>

The problem here is that the wrapper loads all my embed codes at the same time, then hides them all and shows only one. Then, when the user interacts, it will display another page.

My problem is: I need to know when the wrapper shows my code for page 1/2/3 so that further processing can be done.

Hope to get some hints.

@edited 2014-02-15: The owner of the package is using my code. You can think of it as their plugin content.

The wrapper uses display:none to hide or show the iframe that wraps my content.

Ironwood

The answer depends on how to make the iframe invisible. A simple way to detect iframe visibility in an iframe, if display: noneused, is:

var isVisible = !!window.frameElement.offsetWidth; // --> true or false

offsetWidthEquals when set to in an iframe or one of its parent elements .0displaynone

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