https://ccr3.k12.mo.us/shared/scripts/translate.js

1function googleTranslateElementInit() {
2  new google.translate.TranslateElement({pageLanguage: "en"}, 'google_translate_element');
3}
4
5function changeLanguageByButtonClick() {
6  var language = document.getElementById("language").value;
7  var selectField = document.querySelector("#google_translate_element select");
8  for(var i=0; i < selectField.children.length; i++){
9    var option = selectField.children[i];
10    // find desired langauge and change the former language of the hidden selection-field
11    if(option.value==language){
12       selectField.selectedIndex = i;
13       // trigger change event afterwards to make google-lib translate this side
14       selectField.dispatchEvent(new Event('change'));
15       break;
16    }
17  }
18}