javascript - Deferring google charts -


i have google charts code works fine:

<script type="text/javascript" src="https://www.google.com/jsapi"></script> <script type="text/javascript" async>  google.load("visualization", "1", {packages:["corechart"]});  var t1 = 'indextitle' var t2 = 'indicatortitle'  google.setonloadcallback(function(){drawchart1(t1)}); google.setonloadcallback(function(){drawchart2(t2)});  function drawchart1(t){ var data = new google.visualization.datatable(); data.addcolumn('string','date'); data.addcolumn('number','close'); data.addcolumn({type: 'string', role: 'tooltip'}); data.addrows([chartindexdata...........]); var options = {     title: t,     colors:['black'],       legend: {position: 'none'},     chartarea:{left:60,top:20,width:'90%',height:'90%'}    }; var chart = new google.visualization.linechart(document.getelementbyid('chart1_div')); chart.draw(data, options); }  function drawchart2(t){ var data = new google.visualization.datatable(); data.addcolumn('string', 'date'); data.addcolumn('number', ''); data.addcolumn({type: 'string', role: 'tooltip'}); data.addrows([chartindicatordata...................]); var options = {     title: t,     legend: {position: 'none'},     chartarea:{left:60,top:20,width:'90%',height:'60%'}   }; var chart = new google.visualization.linechart(document.getelementbyid('chart2_div')); chart.draw(data, options); }<% </script>

the problem when test page on google pagespeed insite score 49/100 because of script above:

remove render-blocking  javascript:https://www.google.com/jsapi https://www.google.com/…ile=visualization&v=1&packages=corechart https://www.google.com/…at+en,default+en,ui+en,corechart+en.i.js  optimize css delivery of following: https://www.google.com/…bdd6ab2d343a51d49841bf93d022fb/ui+en.css https://ajax.googleapis.com/…static/modules/gviz/1.0/core/tooltip.css

as understand have load javascript asynchronous or defer loading.

how fix it.

tried

window.onload = function () {    google.load("visualization", "1", {packages: ["corechart"], callback: drawcharts});    var t1 = 'indextitle'   var t2 = 'indicatortitle'    function drawcharts() {     drawchart1(t1);     drawchart2(t2);   } }

and worked. also, able change

<script type="text/javascript" src="https://www.google.com/jsapi"></script>

to

<script type="text/javascript" src="https://www.google.com/jsapi" async></script>

which pushed google pageinsite score 49 82. still google pageinsight shows

optimize css delivery of following: https://www.google.com/…bdd6ab2d343a51d49841bf93d022fb/ui+en.css https://ajax.googleapis.com/…static/modules/gviz/1.0/core/tooltip.css

as understand these css loaded when

google.load("visualization", "1", {packages: ["corechart"], callback: drawcharts});

is called. how optimize that?


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