How to automatically resize iframe from inside the iframe?

Call that function of parent page from child page like that,
if you have function having name ReSize for resize iframe in parent page than you can call it from child page with top clause in javascript like that
 
Parent page function
 

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function ReSize()
{
 
//Do stuff for iframe resize

} 

 

Child page function.

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$(document).ready(function(){
 
top.ReSize(); //it will call main parent page function from child page.

});