How can we give auto size the Salesforce visualforce page?

Hi Mohit,

Use this code for auto sizing Visualforce Page:

<apex:page sidebar="false">
<apex:iframe src="https://www.salesforce.com/" id="theFrame" />
<script>document.getElementById('theFrame').height = window.innerHeight - 220;</script>
</apex:page>

Hope this helps you.

Try this code:

<apex:page sidebar=”false”>
    <apex:iframe src=”https://www.salesforce.com/” id=”theFrame” />
    <script>
        (function() { //this wrapper prevents pollution of the global scope
        var windowOnresize = window.onresize;
        window.onresize = function() {
            if (windowOnresize) windowOnresize(); //don’t trample the handler; intercept it
            document.getElementById(‘theFrame’).height = window.innerHeight — 220;
        };
        }());
    </script>
</apex:page>