问题
I am a student studying vue. I used Vue-chartjs to draw a graph, and I'd like to display the value on a pie graph. But I don't know what to do.
Please help me...
the current situation (image) : enter image description here
My wish (image) : enter image description here
Vue.component('pie-chart', {
extends : VueChartJs.Pie,
props: ['data', 'options'],
mounted(){
this.renderPieChart();
},
computed: {
attendanceData : function(){
return this.data
}
},
methods : {
renderPieChart : function(){
this.renderChart(
{
labels: ['a','b','c','d'],
datasets: [{
backgroundColor: ['#10a236', '#f9cd41', '#fe7272', '#5c7add'],
data: [10,20,30,40]
}]
},
{
responsive: true,
maintainAspectRatio: false,
pieceLabel: {
render: 'value',
precision: 1,
}
}
)
}
},
watch : {
attendanceData : function(){
this.$data._chart.destroy();
this.renderPieChart();
}
}
});
回答1:
As The dicusstion on tooltip of chart.js at Stackoverflow, uses plugin is one solution.
then as Vue chart.js guide said,
in mounted(), uses this.addPlugin
to add your plugin like below demo:
Vue.config.productionTip = false
//below plugin is copied from https://stackoverflow.com/a/37989832/5665870
let pluginConfig = {
id: 'my-plugin',
beforeRender: function (chart) {
if (chart.config.options.showAllTooltips) {
// create an array of tooltips
// we can't use the chart tooltip because there is only one tooltip per chart
chart.pluginTooltips = [];
chart.config.data.datasets.forEach(function (dataset, i) {
chart.getDatasetMeta(i).data.forEach(function (sector, j) {
chart.pluginTooltips.push(new Chart.Tooltip({
_chart: chart.chart,
_chartInstance: chart,
_data: chart.data,
_options: chart.options.tooltips,
_active: [sector]
}, chart));
});
});
// turn off normal tooltips
chart.options.tooltips.enabled = false;
}
},
afterDraw: function (chart, easing) {
if (chart.config.options.showAllTooltips) {
// we don't want the permanent tooltips to animate, so don't do anything till the animation runs atleast once
if (!chart.allTooltipsOnce) {
if (easing !== 1)
return;
chart.allTooltipsOnce = true;
}
// turn on tooltips
chart.options.tooltips.enabled = true;
Chart.helpers.each(chart.pluginTooltips, function (tooltip) {
tooltip.initialize();
tooltip.update();
// we don't actually need this since we are not animating tooltips
tooltip.pivot();
tooltip.transition(easing).draw();
});
chart.options.tooltips.enabled = false;
}
}
}
Vue.component('pie-chart', {
extends : VueChartJs.Pie,
props: ['data', 'options'],
mounted(){
this.addPlugin(pluginConfig);
this.renderPieChart();
},
computed: {
attendanceData : function(){
return this.data
}
},
methods : {
renderPieChart : function(){
this.renderChart(
{
labels: ['a','b','c','d'],
datasets: [{
backgroundColor: ['#10a236', '#f9cd41', '#fe7272', '#5c7add'],
data: [10,20,30,40]
}]
},
{
responsive: true,
maintainAspectRatio: false,
pieceLabel: {
render: 'value',
precision: 1
},
showAllTooltips: true
}
)
}
},
watch : {
attendanceData : function(){
//this.$data._chart.destroy();
//this.renderPieChart();
}
}
})
var vm = new Vue({
el: '#app',
data: {
message: 'Hello World'
}
})
<script src="https://unpkg.com/vue@2.5.16/dist/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.min.js"></script>
<script src="https://unpkg.com/vue-chartjs/dist/vue-chartjs.min.js"></script>
<div id="app">
<pie-chart></pie-chart>
</div>
来源:https://stackoverflow.com/questions/51503137/i-want-to-show-the-value-of-label-inside-the-pie-graph-vue-chartjs-piecelabe