wikimedia/mediawiki-extensions-DonationInterface

( function ( $, mw ) {
    var di = mw.donationInterface,
        rules = mediaWiki.config.get( 'wgDonationInterfaceValidationRules' ) || [],
        rulesSatisfied = false;

    function redirect( result ) {
        // We don't actually want to enable the form on redirect or in the
        // complete phase of callDonateApi, so we override enable here.
        di.forms.enable = function () {};
        location.assign( result.redirect );
    }

    di.forms.submit = function () {
        // MediaWiki uses the "uselang" parameter to set the language for localization
        // Checkout /payments/includes/api/ApiMain.php
        di.forms.callDonateApi( redirect, { uselang: $( '#language' ).val() } );
    };
    if ( rules.length === 0 ) {
        rulesSatisfied = true;
    } else {
        // TODO: refactor validation to separate out showing errors, and
        // check that all the rules are satisfied on page load without
        // showing errors.
        if ( di.forms.getOptIn() !== '' ) {
            rulesSatisfied = true;
        }
    }
    if ( rulesSatisfied && !di.validation.hasErrors() ) {
        di.forms.submit();
    }
} )( jQuery, mediaWiki );