ScreenTranslator/translators/google.js

var lastText = '';
var active = window.location.href !== "about:blank";

function checkFinished () {
    if (!active) return;

    let spans = [].slice.call (document.querySelectorAll ('span.translation > span, #result_box > span'));
    let text = spans.reduce (function (res, i) {
        return res + ' ' + i.innerText;
    }, '');

    if (text === lastText || text === '')
        return;

    console.log ('translated text', text, 'old', lastText, 'size', text.length, lastText.length);
    lastText = text;
    active = false;
    proxy.setTranslated (text);
}

function translate (text, from, to){
    console.log('start translate', text, from, to)
    active = true;

    if (window.location.href.indexOf('//translate.google') !== -1
            && window.location.href.indexOf('&tl='+to+'&') !== -1) {
        document.querySelector('textarea#source').value=text;
        return;
    }
    //    var url = 'https://translate.google.com/#auto/' + to + '/' + text;
    let url = 'https://translate.google.com/#view=home&op=translate&sl=auto&tl=' + to + '&text=' + text;
    console.log("setting url", url);
    window.location = encodeURI (url);

}

function init() {
    proxy.translate.connect (translate);
    setInterval(checkFinished, 300);
}