微信小程序中使用ECharts异步加载数据的方法

微信⼩程序中使⽤ECharts异步加载数据的⽅法官⽹例⼦都是同步的，怎么引⼊及同步demo请移步官⽹
<view class="container">
<ec-canvas id="mychart-dom-multi-bar" canvas-id="mychart-multi-bar" ec="{{ ecBar }}"></ec-canvas>
<ec-canvas id="mychart-dom-multi-scatter" canvas-id="mychart-multi-scatter" ec="{{ ecScatter }}"></ec-canvas>
</view>
import * as echarts from '../../ec-canvas/echarts';
Page({
data: {
ecBar: {
lazyLoad: true // 延迟加载
},
ecScatter: {
lazyLoad: true
}
},
onLoad(){
this.barComponent = this.selectComponent('#mychart-dom-multi-bar');
this.scaComponnet = this.selectComponent('#mychart-dom-multi-scatter');
this.init_bar();
this.init_sca();
},
init_bar: function (){
this.barComponent.init((canvas, width, height) => {
// 初始化图表
const barChart = echarts.init(canvas, null, {
width: width,
height: height
});
barChart.setOption(this.getBarOption());
// 注意这⾥⼀定要返回 chart 实例，否则会影响事件处理等
return barChart;
});
},
init_sca: function () {
this.scaComponnet.init((canvas, width, height) => {
// 初始化图表
const scaChart = echarts.init(canvas, null, {
width: width,
height: height
});
scaChart.setOption(this.getScaOption());
// 注意这⾥⼀定要返回 chart 实例，否则会影响事件处理等
return scaChart;
});
},
getBarOption:function(){
//return 请求数据
return {
color: ['#37a2da', '#32c5e9', '#67e0e3'],
tooltip: {
trigger: 'axis',
axisPointer: { // 坐标轴指⽰器，坐标轴触发有效
type: 'shadow' // 默认为直线，可选为：'line' | 'shadow'
}
},
legend: {
data: ['热度', '正⾯', '负⾯']
},
grid: {
left: 20,
right: 20,
bottom: 15,
top: 40,
containLabel: true
},
xAxis: [
{
type: 'value',
axisLine: {
lineStyle: {
color: '#999'
}
},
axisLabel: {
color: '#666'
}
}
],
yAxis: [
{
type: 'category',
axisTick: { show: false },
data: ['汽车之家', '今⽇头条', '百度贴吧', '⼀点资讯', '微信', '微博', '知乎'], axisLine: {
lineStyle: {
color: '#999'
}
},
axisLabel: {
color: '#666'
}
}
],
series: [
{
name: '热度',
type: 'bar',
label: {
normal: {
show: true,
position: 'inside'
}
},
data: [300, 270, 340, 344, 300, 320, 310]
},
{
name: '正⾯',
type: 'bar',
stack: '总量',
label: {
normal: {
show: true
}
},
data: [120, 102, 141, 174, 190, 250, 220]
},
{
name: '负⾯',
type: 'bar',
stack: '总量',
label: {
normal: {
show: true,
position: 'left'
}
},
data: [-20, -32, -21, -34, -90, -130, -110]
}
]
};
},
getScaOption:function(){
//请求数据
var data = [];
var data2 = [];
for (var i = 0; i < 10; i++) {
data.push(
[
Math.round(Math.random() * 100),
Math.round(Math.random() * 100),
Math.round(Math.random() * 40)
]
);
data2.push(
[
Math.round(Math.random() * 100),
Math.round(Math.random() * 100),
Math.round(Math.random() * 100)
]
);
}
var axisCommon = {
axisLabel: {
textStyle: {
color: '#C8C8C8'
}
},
axisTick: {
lineStyle: {
color: '#fff'
}
},
axisLine: {
lineStyle: {
color: '#C8C8C8'
}
},
splitLine: {
lineStyle: {
color: '#C8C8C8',
type: 'solid'
}
}
};
return {
color: ["#FF7070", "#60B6E3"],
backgroundColor: '#eee',
xAxis: axisCommon,
yAxis: axisCommon,
legend: {
data: ['aaaa', 'bbbb']
},
visualMap: {
show: false,
max: 100,
inRange: {
symbolSize: [20, 70]
}
},
series: [{
type: 'scatter',
name: 'aaaa',
data: data
},
{
name: 'bbbb',
type: 'scatter',
data: data2
}
],
animationDelay: function (idx) {
return idx * 50;
},
animationEasing: 'elasticOut'
};
},
});
注意：异步加载时，ec-canvas标签加载显⽰要先于this.scaComponnet.init，否则会报错。

总结
以上所述是⼩编给⼤家介绍的微信⼩程序中使⽤ECharts 异步加载数据的⽅法，希望对⼤家有所帮助，如果⼤家有任何疑问请给我留⾔，⼩编会及时回复⼤家的。

在此也⾮常感谢⼤家对⽹站的⽀持！。