CAS Preserve Anchor tag in URL

alt-cas.js

function prepareSubmit(form) {
    // Extract the fragment from the browser's current location.

    if (self.document.location.hash.indexOf('%00')) {
        self.document.location.hash = self.document.location.hash.replace('%00', '{{casnull}}');
    }

    var hash = decodeURIComponent(self.document.location.hash);

    if (hash.indexOf('{{casnull}}')) {
        hash = hash.replace('{{casnull}}', '%00');
        self.document.location.hash = self.document.location.hash.replace('{{casnull}}', '%00');
    }
    
    // The fragment value may not contain a leading # symbol
    if (hash && hash.indexOf("#") === -1) {
        hash = "#" + hash;
    }

    // Append the fragment to the current action so that it persists to the redirected URL.
    form.action = form.action + hash;
    return true;
}