Document.bindings property (apps for Office)

function displayAllBindings() {
    Office.context.document.bindings.getAllAsync(function (asyncResult) {
        var bindingString = '';
        for (var i in asyncResult.value) {
            bindingString += asyncResult.value[i].id + '\n';
        }
        write('Existing bindings: ' + bindingString);
    });
}

// Function that writes to a div with id='message' on the page.
function write(message){
    document.getElementById('message').innerText += message; 
}