how to access iFrame parent page using jquery?

To find in the parent of the iFrame use:

$('#parentPrice', window.parent.document).html();

The second parameter for the $() wrapper is the context in which to search. This defaults to document.

how to access iFrame parent page using jquery

window.parent.document.

jQuery is a library on top of JavaScript, not a complete replacement for it. You don't have to replace every last JavaScript expression with something involving $.

yeah it works for me as well.

Note : we need to use window.parent.document

    $("button", window.parent.document).click(function()
    {
        alert("Functionality defined by def");
    });