Redirect form out of iframe on click submit using javascript, ajax or PHP

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Good Day,

Please I am trying execute multiple on click function but I am having problem doing this.

I am a beginner in programming, I'd appreciate if you can help me resolve this problem.

I need help with code sample on how to execute 1stFunction, followed my the 2nd function.

Basically I need to code to validate the Form >> Submit The form to Database >> and Redirect the parent page on clicking of the Iframe submit Button.

Thank you.

What I have tried:

I have showed in my Code

Below is the review of my code:

<button data-uifm-tabnum="0" class="rockfm-txtbox-inp-val btn" type="submit" data-val-btn="Submit" data-val-subm="Sending" onclick="javascript:rocketfm.submitForm(this);return false;" >Submit</button>

Below is a Single Onclick Function that submit form -1st Function;

<pre lang="text">onclick="javascript:rocketfm.submitForm(this);return false;"

Below is the redirect Function I would like to add as the second function -2nd Function:

top.location = 'https://google.com';

How can I achieve this? Help me pls.

Thanks