Custom Legend with ChartJS v2.0
I'm trying to create a custom legend template in ChartJS v2.0. In v1* of ChartJS I simply added a property to the new Chart constructor such as...
legendTemplate : '<ul>'
+'<% for (var i=0; i<datasets.length; i++) { %>'
+'<li>'
+'<span style=\"background-color:<%=datasets[i].lineColor%>\"></span>'
+'<% if (datasets[i].label) { %><%= datasets[i].label %><% } %>'
+'</li>'
+'<% } %>'
+'</ul>'
I can't seem to find any documentation in v2.0 for this option. Is it even available anymore? Can anyone show an example of how to accomplish this?
Thank you!
Update - Working code below
legendCallback: function(chart) {
console.log(chart.data);
var text = [];
text.push('<ul>');
for (var i=0; i<chart.data.datasets[0].data.length; i++) {
text.push('<li>');
text.push('<span style="background-color:' + chart.data.datasets[0].backgroundColor[i] + '">' + chart.data.datasets[0].data[i] + '</span>');
if (chart.data.labels[i]) {
text.push(chart.data.labels[i]);
}
text.push('</li>');
}
text.push('</ul>');
return text.join("");
}
Solution 1:
If you guys run through this post and tried the posted answer and didn't work, try this one:
legendCallback: function(chart) {
var text = [];
text.push('<ul>');
for (var i=0; i<chart.data.datasets.length; i++) {
console.log(chart.data.datasets[i]); // see what's inside the obj.
text.push('<li>');
text.push('<span style="background-color:' + chart.data.datasets[i].borderColor + '">' + chart.data.datasets[i].label + '</span>');
text.push('</li>');
}
text.push('</ul>');
return text.join("");
},
Then add this below:
document.getElementById('chart-legends').innerHTML = myChart.generateLegend();
To create the legends. Make sure you have an element <div id="chart-legends"></div>
Solution 2:
There is a legendCallback
function:
legendCallback Function
function (chart) { }
Function to generate a legend. Receives the chart object to generate a legend from. Default implementation returns an HTML string.
Details can be found here
see this issue for the default legend callback:
legendCallback: function(chart) {
var text = [];
text.push('<ul class="' + chart.id + '-legend">');
for (var i = 0; i < chart.data.datasets.length; i++) {
text.push('<li><span style="background-color:' +
chart.data.datasets[i].backgroundColor +
'"></span>');
if (chart.data.datasets[i].label) {
text.push(chart.data.datasets[i].label);
}
text.push('</li>');
}
text.push('</ul>');
return text.join('');
}