Access a variable of iframe from parent

Question

script of iframe

script of parent window

Answer 1

One method that has always worked reliably for me is for the iFrame to give its parent a reference to its own window when it first loads. The parent can then access all the variables through that reference. This does require that the parent is loaded before the iFrame, but for me that is usually the case.

So in the parent

var iFrameWin;

Then in the iFrame at some point after it has loaded and settled down

parent.iFrameWin = window;  //parent now has a ref to the iframe's window

Then, in the parent when it wants a global var contents from the iFrame

alert(iFrameWin.ivar);  // shows value if the global 'ivar' in the iFrame