Auto Check Canvas Inbox Messages

// Attempt to find the message list on this page.
var msgList = document.querySelector('#content .message-list .messages');
var scroller = document.querySelector('#content .message-list-scroller');

// If the list was found continue.
if( msgList && scroller ){
    console.log('Active.')
    var li = document.createElement('LI');
    li.id = 'controls'
    var html = '<label>Ignore last <input type="text" id="days" style="display:inline-block;"> days.</label><br>'
    html += '<button onclick="run();">Auto Check Messages</div>'
    li.innerHTML = html;
    msgList.prepend( li );
} else {
    console.log('Something is wrong.');
}

function run(){
    console.log('Start auto scroll.')
    recursiveScroll( scroller );
}

// Auto scroll so the list loads all messages.
function recursiveScroll( scroller ){
    var height = 0;
    var limit = 0;
    if( scroller.dataset.height ){
        var height = parseInt( scroller.dataset.height )
    }
    if( scroller.dataset.limit ){
        var limit = parseInt( scroller.dataset.limit )
    }
    if( scroller.scrollHeight == height ){
        limit++;
    } else {
        limit--;
    }
    if( scroller.scrollHeight > height || limit < 10 ){
        scroller.scrollTo( 0, scroller.scrollHeight );
        scroller.dataset.height = scroller.scrollHeight;
        scroller.dataset.limit = limit;
        setTimeout( function(){
            recursiveScroll( scroller );
        }, 175 );
    } else {
        console.log( 'Scrolling done.' );
        var days = parseInt( msgList.querySelector('li #days').value );
        if( days < 0 ){
            days = 30;
        }
        console.log('Start auto check.');
        msgList.removeChild( msgList.querySelector('#controls') );
        checker( days );
    }
}

function checker( days ){
    var lis = msgList.querySelectorAll('li');
    var d, n, t;
    lis.forEach( function( item ){
        t = item.querySelector('time');
        if( t ){
            d = new Date( t.dateTime );
            d = d.getTime();
            n = new Date();
            n = n.getTime() - ( 86400000 * days );
            if( d < n ){
                item.querySelector('label').click();
            }
        }
    } );
    console.log('Done auto check.');
}