How can I make a html legend from Chart.js
to hide/show the dataset
of the chart, like the legend generated by the Chart.js
itself
Legend on bottom -> Chart.js legend
Legend on right-> HTML
How can I click in "SETOR AGILIZA" and get the dataset
relative to it hide/show
I found this code in the chat.js/core.legend.js core.legend
onClick: function(e, legendItem) {
var index = legendItem.datasetIndex;
var ci = this.chart;
var meta = ci.getDatasetMeta(index);
// See controller.isDatasetVisible comment
meta.hidden = meta.hidden === null? !ci.data.datasets[index].hidden : null;
// We hid a dataset ... rerender the chart
ci.update();
},
But I have no clue how to get it to work on a onClick
event in the html legend
the labels names are get from a database, so they can change.
UPDATE 1
Found this Github, trying to make it work
So, I got it right following this Post
Here is the code of the post
var weightChartOptions = {
responsive: true,
legendCallback: function(chart) {
console.log(chart);
var legendHtml = [];
legendHtml.push('<table>');
legendHtml.push('<tr>');
for (var i=0; i<chart.data.datasets.length; i++) {
legendHtml.push('<td><div class="chart-legend" style="background-color:' + chart.data.datasets[i].backgroundColor + '"></div></td>');
if (chart.data.datasets[i].label) {
legendHtml.push('<td class="chart-legend-label-text" onclick="updateDataset(event, ' + '\'' + chart.legend.legendItems[i].datasetIndex + '\'' + ')">' + chart.data.datasets[i].label + '</td>');
}
}
legendHtml.push('</tr>');
legendHtml.push('</table>');
return legendHtml.join("");
},
legend: {
display: false
}
};
// Show/hide chart by click legend
updateDataset = function(e, datasetIndex) {
var index = datasetIndex;
var ci = e.view.weightChart;
var meta = ci.getDatasetMeta(index);
// See controller.isDatasetVisible comment
meta.hidden = meta.hidden === null? !ci.data.datasets[index].hidden : null;
// We hid a dataset ... rerender the chart
ci.update();
};
var ctx = document.getElementById("weightChart").getContext("2d");
window.weightChart = new Chart(ctx, {
type: 'line',
data: weightChartData,
options: weightChartOptions
});
document.getElementById("weightChartLegend").innerHTML = weightChart.generateLegend();
};
the secret here is the legendCallback in line 3
In this example he uses line chart, in my case I used bars
So i changed the table tags for list tags for me worked better this way
He emphasizes to put "window" before the variable who gets the "= new Chart"
window.weightChart = new Chart(ctx, {.....
Then with a little of CSS you can get a nice legend with a hide/show option