google analytics api - Call function within another in Javascript -

i've following script:

gapi.analytics.ready(function() {   viewselector.on('viewchange', function update (data) {   var title = document.getelementbyid('view-name');   title.innerhtml = data.property.name + ' (' + data.view.name + ')';    activeusers.set(data).execute();   renderweekoverweekchart(data.ids);   rendertopbrowserschart(data.ids);   rendertopcountrieschart(data.ids);    settimeout(function() {     var list = document.getelementsbytagname("tr")[0];     list.getelementsbytagname("th")[0].innerhtml = "pagina's";     list.getelementsbytagname("th")[1].innerhtml = "paginaweergaven";   }, 500);   }); }); 

and within following code re-run update(); function.

function datumwissel( datumbtn ) {  if ( datumbtn.classname == 'maand' ) {     datumbtn.classname = 'jaar';     dimensions1 =  'ga:month,ga:nthmonth';     start1 = moment(now).date(1).month(0).format('yyyy-mm-dd');     end1 = moment(now).format('yyyy-mm-dd');     start2 = moment(now).subtract(1, 'year').date(1).month(0).format('yyyy-mm-dd');     end2 = moment(now).date(1).month(0).subtract(1, 'day').format('yyyy-mm-dd');     format1 = 'm';     format2 = 'mmm';     update();  }   else {     datumbtn.classname = 'maand';     dimensions1 =  'ga:date,ga:nthweek';     start1 = moment(now).subtract(2, 'day').date(1).format('yyyy-mm-dd');     end1 = moment(now).format('yyyy-mm-dd');     start2 = moment(now).subtract(2, 'day').date(1).subtract(1, 'month').format('yyyy-mm-dd');     end2 = moment(now).subtract(2, 'day').date(1).subtract(1, 'day').format('yyyy-mm-dd');     format1 = 'yyyymmdd';     format2 = 'do';     update();   }  }   

but somehow doesn't work. tried in above script: window.update = function (data) {}. doesn't work.

how can call update(); function situated inside gapi.analytics.ready(function() {} ?

important cannot make globally has situated inside gapi.analytics.ready().

it's simple matter of moving function declaration

function update (data) {   // same existing code }  gapi.analytics.ready(function() {   viewselector.on('viewchange', update ); }); 

and passing in data needed when call in other function

function datumwissel( datumbtn ) {  if ( datumbtn.classname == 'maand' ) {     ..........      update(datumbtn);  }.......