Android set Selectbox value in WebView

I've got the problem, that my App doesnt select automatic an value in selectbox. ive tried wv.loadUrl("document.getElementById('element')[1].value = '23';};"); but that wont work for me. my Webview function:

WebView wv = (WebView) getView().findViewById(R.id.webView1); wv.getSettings().setJavaScriptEnabled(true); wv.getSettings().setUseWideViewPort(true); wv.loadUrl(url);

the selectBox i want to select a value:

<select name="element" class="selectbox" style="width:114" size="12" onchange="doDisplayTimetable(NavBar, topDir);">
                
<option value="1">5a</option><option value="2">5b</option><option value="3">5c</option><option value="4">5d</option><option value="5">5e</option><option value="6">6a</option><option value="7">6b</option><option value="8">6c</option><option value="9">6d</option>