Google Calendar: Show more than 4 weeks at a time.

gcal-many-weeks.js

function trigger(ename, elem){
    if (!elem) {
        console.log("Cannot " + ename + " element missing");
    }
    console.log("Trigger " + ename + " on " + elem);
    console.log(elem);
    var evt = document.createEvent("MouseEvents");
    evt.initMouseEvent(ename, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
    elem.dispatchEvent(evt) 
}
 
var start = function(){
    return document.getElementsByClassName('dp-today-selected')[0] || 
         document.getElementsByClassName('dp-onmonth')[new Date().getDate()];
};

var end = function(n){return document.getElementsByClassName('dp-cell')[n || 52]};
var custom_view = function(){return document.getElementById('topRightNavigation').children[0].children[4];};
var prev_month = function(){return document.getElementsByClassName('navBack')[0];};
var today = function(){return (document.getElementById('todayButton:1') || document.getElementById('todayButton:2')).children[0];};
var next_month = function(){return document.getElementById('dp_0_next');};

var set_range = function(months, weeks_to_remove){
    days = (7 * (7 - weeks_to_remove)) + 3;
    // go back a couple of months
    trigger('click', prev_month());
    trigger('click', prev_month());

    // move to custom view
    trigger('mouseup', custom_view());

    // slide range to start today
    trigger('click', today());

    // do a double manoeuvre: click next month during a click drag over the mini calendar.
    // this is how we reach more than one month
    trigger('mousedown', start());
    for (i = 0; i < months; i++) { 
        trigger('mousedown', next_month());
    }
    trigger('mousemove', end(days));
    trigger('mouseup', end(days));

    trigger('click', today());
}

set_range(2, 1);