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var element = document.querySelector('#textinput');
element.addEventListener('keyup', handleText, false);

function handleText (e) {
    // Get the text
    var text = e.target.value;
    
    // Query the service via a Promise API
    queryService(text).then(function (results) {
        // Handle completion
    }, function (err) {
        // Handle errors
    });
}