Chart.js legend took up too much spaces

问题:

I was having some problem with chart.js legend. The legend with long text took up too much spaces which resulting in the reduce in the size of my pie chart:

Another example is this:

If I got more legend, the doughnut chart will eventually becomes smaller and smaller.

I tried to set maxWidth but to no avail.

var options = {
            layout: {
                padding: {
                  top: 5
                }
            },
            responsive: true,
            maintainAspectRatio: false,
            legend: {
                display: true,
                position: 'right',
                maxWidth: 100,
                onClick: null
            },
            animation: {
                animateScale: true,
                animateRotate: true
            },

        };

Any ideas? Thanks in advanced!

I tried to follow this [solution][3] to create a html legend:

<div class="box-body" style="height:350px;">
<div class="float-left">
<div class="float-left" style="width:70%">

<canvas id="brandChart" style="position: relative; height: 350px;"></canvas>
</div>
<div class="float-left" style="width:30%">

<div id="js-legend" class="chart-legend">
</div>

</div>
</div>

It did restricted the width for legend, but then this lead to another problem which is after I collapsed and expanded the div, the canvas just went missing and I am only left with the legend div.

回答1:

First off, set canvas­'s width and height using it­'s native attributes (do not use style attribute), like so :

<canvas id="brandChart" width="700" height="350"></canvas>

^{note: width should be twice the height}

Then, set responsive property to false in your chart options, as such :

options: {
   responsive: false,
   ...
}

ᴅᴇᴍᴏ

var chart = new Chart(brandChart, {
   type: 'doughnut',
   data: {
      labels: ['Etronin Home Appliances Service & trading Pte Ltd', 'Giant'],
      datasets: [{
         data: [30, 70],
         backgroundColor: ['#2196f3', '#4caf50']
      }]
   },
   options: {
      responsive: false,
      legend: {
         display: true,
         position: 'right',
         onClick: null
      },
   }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="brandChart" width="700" height="350"></canvas>

回答2:

Long legend nowrap is a known issue check https://github.com/chartjs/Chart.js/issues/3641

May be they can cover it in next releases. For now the solution is to remove the native legend and draw your custom one

I've created this plunk as an example for doghnut chart with custom legend https://embed.plnkr.co/5nuGS2KEV6hvESwGrOse/

回答3:

This post is 9 months old but for the ones who are looking for a solution, use the following and this will make the pie/doughnut bigger in mobile/responsive view

Chart.defaults.global.maintainAspectRatio = false;