Script to set the default value for a <select> (dropdown). The script contains a field name and an option name for a Salsa client.

set_dropdown_default.html

<script type="javascript">
//Script to look for a specific value in a <select> (dropdown).  If found
//then make it the default.
document.addEventListener(function() {
    var e = document.querySelector('select[name="auswahl_spendenzweck"]');
    if (e != null) {
        var option = e.querySelector('option[value="Da wo es am nötigsten ist"]');
        if (option != null) {
            option.selected = true;
        }
    }
})
</script>