javascript - chart.js v2: how to add tooltips of metadata? -

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i want add metadata each tooltips.

data is

x.label=['jan.', 'feb.','mar.','apr.','may','jun'] x.data=[-30,-24,-10,4,12,15] x.metadata=['extrmely cold','exreme cold too','mostlry spring','spring has come!', 'sakura blooming' ,'hot!']

when click (apr., 4) tooltip shows

'apr., 4°c \n spring has come!'

how can edit tooltip function?

this works me. created array (myarr variable) tooltip.callbacks.label function, , appended return value. think, if put x.metadata values myarr, works.

var options = {                     tooltips: {                         enabled:false,                         callbacks:{                             label: function(tooltipitem, data) {                                 var myarr = [11,22,33,44,55]                                 var datasetlabel = data.datasets[tooltipitem.datasetindex].label || '';                                 //this tooltip.body                                 return datasetlabel + ': ' + tooltipitem.ylabel +' :'+ myarr[tooltipitem.index];                             },                         },                         custom: function(tooltip) {                             var tooltipel = $('#chartjs-tooltip');                              if (!tooltip) {                                 tooltipel.css({                                     opacity: 0                                 });                                 return;                             }                              if (typeof  tooltip.body != 'undefined') {                                  var bodytext = tooltip.body[0].split(":");                                 var innerhtml = '<span class="chartjs-tooltip-header"><b>'+tooltip.title[0]+'</b></span><br>'                                                 +'<span>' + bodytext[0].trim() + '</span> : <span><b>' + bodytext[1].trim() +'</b></span>'                                                 +'<span>' + bodytext[2].trim() + '</span>';                                 tooltipel.html(innerhtml);                                  tooltipel.css({                                     opacity: 1,                                     left: (tooltip.xpadding * 3) + tooltip.x + 'px',                                     top: (tooltip.ypadding * 3) + tooltip.y + 'px',                                 });                              }                           }                     }                 };

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