Intercept the data of google poi while user clicks on the map.

interceptor.js

var url = {
    getQueryParameter: function (name, url) {
            if (!url) {
                url = window.location.href;
            }
            name = name.replace(/[\[\]]/g, "\\$&");
            var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
                results = regex.exec(url);
            if (!results) return null;
            if (!results[2]) return '';
            return decodeURIComponent(results[2].replace(/\+/g, " "));
        }
};

var observer = new MutationObserver(function(mutations) {
    var i = 0, jsonpScript, jsonpCallback, jsonpCallbackNP, insertedNodes = [];
    mutations.forEach(function(mutation) {
        for (i = 0; i < mutation.addedNodes.length; i++) {
            insertedNodes.push(mutation.addedNodes[i]);
        }
    });
    jsonpScript = [].filter.call(insertedNodes, function (script) {
        if (script.src) {
            return script.src.indexOf('https://maps.googleapis.com/maps/api/js/jsonp/ApplicationService.GetEntityDetails') > -1;
        } else {
            return false;
        }
    }).pop();
    if (jsonpScript) {
        jsonpCallbackNP = url.getQueryParameter('callback', jsonpScript.src).split('.');
        jsonpCallback = window[jsonpCallbackNP[0]][jsonpCallbackNP[1]];
        window[jsonpCallbackNP[0]][jsonpCallbackNP[1]] = function (d) {
            console.log(d);
            jsonpCallback(d);
        };
    }
});
observer.observe(query.q('head'), { childList: true });