Remove unnecessary use of jquery on the recaptcha page

[dkasak]

Currently we use jquery for some very rudimentary operations on the recaptcha page.

synapse/synapse/res/templates/recaptcha.html

Lines 8 to 13 in 73cbb28

	<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
	<link rel="stylesheet" href="/_matrix/static/client/register/style.css">
	<script>
	function captchaDone() {
	$('#registrationForm').submit();
	}

This seems like overkill since they could easily be replaced by document.getElementById or document.querySelector.

[Jennyfriel]

Good day,

How i submit my registration form??

[ankur12-1610]

I'll work on it!

[GAURAV1-ui]

Hey, I would love to solve this issue.

[DMRobertson]

To do this:

1. Remove the jquery script tags quoted above.

2. Replace the script with

   function captchaDone() {
        document.getElementById('registrationForm').submit(); 
   } 

   assuming that jquery's .submit method is a wrapper around HTMLFormElement.submit.

3. Ideally: test this works---not sure how that's done though.

[JeyRathnam]

Is this still needed? If so, can I work on it?

[squahtx]

Is this still needed? If so, can I work on it?

Yes, feel free to work on it and open a PR.