Android : Problems using Javascript on a specific Website WebView Android

I am trying to prefill a webview using javascript using the code below. I am retrieving the names of the elements using Chrome, but they strings do not pass over once the page is loaded. Here is the website I am trying to prefill (username, password, and the submit button), https://elearning.uh.edu/webapps/portal/frameset.jsp

Any help would be greatly appreciated

myWebView.getSettings().setDomStorageEnabled(true);
    myWebView.getSettings().setJavaScriptEnabled(true);
    myWebView.loadUrl("https://elearning.uh.edu/webapps/portal/frameset.jsp");


    myWebView.setWebViewClient(new WebViewClient() {
        public void onPageFinished(WebView view, String url) {
            ParseUser currentUser = ParseUser.getCurrentUser();
            String userName = currentUser.getString("username");
            String pwd = "pass";

            //Names come from javascript code on webpage for each individual field
            view.loadUrl("javascript: {" +
                    "document.getElementById('user_id').value = '"+userName +"';" +
                    "document.getElementById('password').value = '"+pwd+"';" +
                    "document.getElementByName('login').click(); };");

        }
    });



    return rootView;
}