Automatically function for a form on webpage without click on button

Here is my code for going to the Paypal payment gateway for the item after a click on the “Buy Now” Button, But I want this function to be without even click on the “Buy Now” button, my meaning is when then webpage opened automatically go to the Paypal payment gateway without a click on “Buy Now” button. Is it possible? Any guidance will be very helpful.

<script type="text/javascript" src="https://test.com/java.js"></script>

<form target="PayPal" action="https://www.paypal.com/cgi-bin/webscr" method="post" style="margin:0;padding:0;">
<input type="hidden" name="business" value="test@yahoo.com">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="item_name" value="Membership">
<input type="hidden" name="item_number" value="1 Month">
<input type="hidden" name="amount" value="23">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="shipping" value="">
<input type="hidden" name="shipping2" value="">
<input type="hidden" name="handling" value="">
<input type="hidden" name="return" value="https://test.com/Successful_Payment.php">
<input type="hidden" name="cancel_return" value="">
<input type="hidden" name="undefined_quantity" value="0">
<input type="hidden" name="receiver_email" value="test@yahoo.com">
<input type="hidden" name="no_shipping" value="1">
<input type="hidden" name="no_note" value="0">
<div id="PayPal6" style="position:absolute;left:445px;top:470px;width:134px;height:65px;">
<input type="image" name="submit" src="images/buynow.png" style="position:absolute;left:0px;top:0px;" alt="Make payments with PayPal, it's fast, free, and secure!">
</div>
</form>

Answer

U can achieve that by JavaScript:

window.onload = function(){
// u should put a name for your form
  document.forms['my_form_name'].submit();
}

EDIT: You could also submit the PayPal submit button instead of the form:

window.onload = function(){
    document.getElementById('paypalButton').submit();
}

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Answer