HTML5与ECharts实现异步动态数据加载详解
本文介绍如何使用HTML5、JavaScript、jQuery和ECharts实现异步动态数据加载。通过Ajax请求JSON数据,利用数组的shift和push方法模拟队列,配合setInterval定时器每2秒更新图表数据,从而实现伪实时的动态显示效果。
ECharts异步动态数据加载方案概述
近期研究了ECharts官方提供的API与示例,发现其功能十分强大。基于模型预测生成的数据,本文演示如何构建一个模拟实时的动态数据展示方案。
HTML页面结构与初始化配置
首先,创建一个名为index.html的文件,并使用VS Code进行编辑。
第一步,在页面中插入一个用于承载图表的容器标签。
<div id="main" style="width:600px;height:400px;"></div>
为该标签设置相应的CSS样式(具体样式可根据需求自行调整,此处为简化演示未做过多美化)。
第二步,在body标签内部添加一个<script>脚本块。将JS代码置于body底部有助于提升页面加载体验,具体原理可自行查阅相关资料。
接下来探讨脚本的具体编写内容,我们将分步骤进行。
首先,初始化一个ECharts实例,此处将其命名为MyChart。
var myChart = echarts.init(document.getElementById('main'));
其次,配置setOption以初始化图表,填入基础参数(具体配置项可参考ECharts官网文档)。
完成初始化后,即可通过Ajax异步读取本地JSON文件数据。
若对堆栈操作或数组的push、shift方法不熟悉,可参考相关技术链接(部分链接可能受网络环境影响)。
$.ajax({
type:"get",
// async:true,
url:"test_data.json",
data:{},
dataType:"json",
success:function(result){
var datas=result
if(result){
var m=0;
for(var i=0;i<result.length;i++){
if(m<1000){
datas.shift();
date.push(result[i]["time"]);
data.push(result[i]["AM23SIG0206.AV"]);
m+=1;
}
else{
break;
}
myChart.hideLoading();
setInterval(function(){
for(var n=0;n<2;n++){
date.shift();
date.push(datas[n]["time"]);
data.shift();
data.push(datas[n]["AM23SIG0206.AV"]);
}
myChart.setOption({
xAxis:{
data:date
},
series:[
{
name:"参数",
data:data
}
]});
for(var nn=0;nn<2;nn++){
datas.shift()
}
},2000);
}
}
},
error:function(errorMsg){
alert("图表请求数据失败!");
myChart.hideLoading();
myChart_2.hideLoading();
}
})
异步加载原理与动态更新机制
下面详细解释异步加载的实现原理:
首先加载一个.json文件,将结果存入变量result中并开始处理数据。利用队列概念,预先设定图表显示的数据量上限(例如1000个点),并将数据存入data数组。若需实现动态实时效果,需不断向队列添加新数据。由于队列容量有限(如仅容纳1000个数据点),当数据超出容量时,需移除旧数据以腾出空间,如此循环往复即可实现动态更新。
为了简化“取一个存一个”的操作,可以设置一个定时器setInterval()。在此定时器中,每隔2秒更新2个数据点。具体操作是通过data.shift()移除队首元素,并通过data.push()添加新元素。
通过上述push操作添加新数据。
这一过程模拟了队列(FIFO)的行为,而非堆栈(LIFO),从而实现数据的动态滚动显示。
通过上述机制,即可实现数据的动态刷新效果。
若仅实现前端静态数据模拟略显单薄,后续可进一步研究结合后端框架、数据库与前端的完整数据交互方案。
源码示例与数据文件说明
以下是完整源代码,读者可自行运行测试以验证动态效果。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Charts</title>
<script type="text/javascript" src="echarts.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></script>
</head>
<body>
<div id="main" style="width:600px;height:400px;"></div>
<div id="main_2" style="width:600px;height:400px;"></div>
</body>
<script type="text/javascript">
var myChart = echarts.init(document.getElementById('main'));
var myChart_2 = echarts.init(document.getElementById('main_2'));
myChart.setOption({
title:{
text:'异步数据加载'
},
tooltip:{
show:true,
},
xAxis:{
type:'category',
boundaryGap:false,
data:[],
splitLine: {
show: false
},
},
yAxis:{
boundaryGap:[0,'100%'],
type:'value',
min:'dataMin',
max:'dataMax',
splitLine: {
show: false
},
},
series:[{
name:'参数',
type:'line',
data:[]
}]
});
myChart_2.setOption({
title:{
text:'异步数据加载'
},
tooltip:{
show:true,
},
xAxis:{
type:'category',
boundaryGap:false,
data:[],
splitLine: {
show: false
},
},
yAxis:{
boundaryGap:[0,'100%'],
type:'value',
min:'dataMin',
max:'dataMax',
splitLine: {
show: false
},
},
series:[{
name:'参数',
type:'line',
data:[]
}]
});
myChart.showLoading();
myChart_2.showLoading();
var date = [];
var data = [];
$.ajax({
type:"get",
// async:true,
url:"test_data.json",
data:{},
dataType:"json",
success:function(result){
var datas=result
if(result){
var m=0;
for(var i=0;i<result.length;i++){
if(m<1000){
datas.shift();
date.push(result[i]["time"]);
data.push(result[i]["AM23SIG0206.AV"]);
m+=1;
}
else{
break;
}
myChart.hideLoading();
myChart_2.hideLoading();
setInterval(function(){
for(var n=0;n<2;n++){
date.shift();
date.push(datas[n]["time"]);
data.shift();
data.push(datas[n]["AM23SIG0206.AV"]);
}
myChart.setOption({
xAxis:{
data:date
},
series:[
{
name:"参数",
data:data
}
]});
myChart_2.setOption({
xAxis:{
data:date
},
series:[
{
name:"参数",
data:data
}
]});
for(var nn=0;nn<2;nn++){
datas.shift()
}
},2000);
}
}
},
error:function(errorMsg){
alert("图表请求数据失败!");
myChart.hideLoading();
myChart_2.hideLoading();
}
})
</script>
</html>
[
{
"AM23SIG0206.AV": "594.4071",
"time": "2016-05-01 00:00:01"
},
{
"AM23SIG0206.AV": "594.4207",
"time": "2016-05-01 00:00:04"
},
{
"AM23SIG0206.AV": "594.3883",
"time": "2016-05-01 00:00:07"
},
{
"AM23SIG0206.AV": "594.3586",
"time": "2016-05-01 00:00:10"
},
{
"AM23SIG0206.AV": "594.3883",
"time": "2016-05-01 00:00:13"
},
{
"AM23SIG0206.AV": "594.3398",
"time": "2016-05-01 00:00:16"
},
{
"AM23SIG0206.AV": "594.3398",
"time": "2016-05-01 00:00:19"
},
{
"AM23SIG0206.AV": "594.3075",
"time": "2016-05-01 00:00:22"
},
{
"AM23SIG0206.AV": "594.3076",
"time": "2016-05-01 00:00:25"
},
{
"AM23SIG0206.AV": "594.2753",
"time": "2016-05-01 00:00:28"
},
{
"AM23SIG0206.AV": "594.2753",
"time": "2016-05-01 00:00:31"
},
{
"AM23SIG0206.AV": "594.2429",
"time": "2016-05-01 00:00:34"
},
{
"AM23SIG0206.AV": "594.2753",
"time": "2016-05-01 00:00:37"
},
{
"AM23SIG0206.AV": "594.2429",
"time": "2016-05-01 00:00:40"
},
{
"AM23SIG0206.AV": "594.2565",
"time": "2016-05-01 00:00:43"
},
{
"AM23SIG0206.AV": "594.3075",
"time": "2016-05-01 00:00:46"
},
{
"AM23SIG0206.AV": "594.2726",
"time": "2016-05-01 00:00:49"
},
{
"AM23SIG0206.AV": "594.2752",
"time": "2016-05-01 00:00:52"
},
{
"AM23SIG0206.AV": "594.2914",
"time": "2016-05-01 00:00:55"
},
{
"AM23SIG0206.AV": "594.2726",
"time": "2016-05-01 00:00:58"
},
{
"AM23SIG0206.AV": "594.3075",
"time": "2016-05-01 00:01:01"
},
{
"AM23SIG0206.AV": "594.3075",
"time": "2016-05-01 00:01:04"
},
{
"AM23SIG0206.AV": "594.2752",
"time": "2016-05-01 00:01:07"
},
{
"AM23SIG0206.AV": "594.259",
"time": "2016-05-01 00:01:10"
},
{
"AM23SIG0206.AV": "594.2752",
"time": "2016-05-01 00:01:13"
},
{
"AM23SIG0206.AV": "594.2403",
"time": "2016-05-01 00:01:16"
},
{
"AM23SIG0206.AV": "594.2402",
"time": "2016-05-01 00:01:19"
},
{
"AM23SIG0206.AV": "594.1918",
"time": "2016-05-01 00:01:22"
},
{
"AM23SIG0206.AV": "594.2241",
"time": "2016-05-01 00:01:25"
},
{
"AM23SIG0206.AV": "594.1918",
"time": "2016-05-01 00:01:28"
},
{
"AM23SIG0206.AV": "594.1595",
"time": "2016-05-01 00:01:31"
},
{
"AM23SIG0206.AV": "594.0975",
"time": "2016-05-01 00:01:34"
},
{
"AM23SIG0206.AV": "594.1272",
"time": "2016-05-01 00:01:37"
},
{
"AM23SIG0206.AV": "594.111",
"time": "2016-05-01 00:01:40"
},
{
"AM23SIG0206.AV": "594.1136",
"time": "2016-05-01 00:01:43"
},
{
"AM23SIG0206.AV": "594.0787",
"time": "2016-05-01 00:01:46"
},
{
"AM23SIG0206.AV": "594.0813",
"time": "2016-05-01 00:01:49"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:01:52"
},
{
"AM23SIG0206.AV": "594.014",
"time": "2016-05-01 00:01:55"
},
{
"AM23SIG0206.AV": "594.014",
"time": "2016-05-01 00:01:58"
},
{
"AM23SIG0206.AV": "594.0328",
"time": "2016-05-01 00:02:01"
},
{
"AM23SIG0206.AV": "594.049",
"time": "2016-05-01 00:02:04"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:02:07"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:02:10"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:02:13"
},
{
"AM23SIG0206.AV": "594.0787",
"time": "2016-05-01 00:02:16"
},
{
"AM23SIG0206.AV": "594.049",
"time": "2016-05-01 00:02:19"
},
{
"AM23SIG0206.AV": "594.0625",
"time": "2016-05-01 00:02:22"
},
{
"AM23SIG0206.AV": "594.0948",
"time": "2016-05-01 00:02:25"
},
{
"AM23SIG0206.AV": "594.0774",
"time": "2016-05-01 00:02:28"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:02:31"
},
{
"AM23SIG0206.AV": "594.0948",
"time": "2016-05-01 00:02:34"
},
{
"AM23SIG0206.AV": "594.0625",
"time": "2016-05-01 00:02:37"
},
{
"AM23SIG0206.AV": "594.0625",
"time": "2016-05-01 00:02:40"
},
{
"AM23SIG0206.AV": "594.0625",
"time": "2016-05-01 00:02:43"
},
{
"AM23SIG0206.AV": "594.0787",
"time": "2016-05-01 00:02:46"
},
{
"AM23SIG0206.AV": "594.045",
"time": "2016-05-01 00:02:49"
},
{
"AM23SIG0206.AV": "594.0127",
"time": "2016-05-01 00:02:52"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:02:55"
},
{
"AM23SIG0206.AV": "594.014",
"time": "2016-05-01 00:02:58"
},
{
"AM23SIG0206.AV": "594.0464",
"time": "2016-05-01 00:03:01"
},
{
"AM23SIG0206.AV": "593.9818",
"time": "2016-05-01 00:03:04"
},
{
"AM23SIG0206.AV": "593.9495",
"time": "2016-05-01 00:03:07"
},
{
"AM23SIG0206.AV": "593.9481",
"time": "2016-05-01 00:03:10"
},
{
"AM23SIG0206.AV": "593.8997",
"time": "2016-05-01 00:03:13"
},
{
"AM23SIG0206.AV": "593.8997",
"time": "2016-05-01 00:03:16"
},
{
"AM23SIG0206.AV": "593.8673",
"time": "2016-05-01 00:03:19"
},
{
"AM23SIG0206.AV": "593.835",
"time": "2016-05-01 00:03:22"
},
{
"AM23SIG0206.AV": "593.8027",
"time": "2016-05-01 00:03:25"
},
{
"AM23SIG0206.AV": "593.7704",
"time": "2016-05-01 00:03:28"
},
{
"AM23SIG0206.AV": "593.7704",
"time": "2016-05-01 00:03:31"
},
{
"AM23SIG0206.AV": "593.7193",
"time": "2016-05-01 00:03:34"
},
{
"AM23SIG0206.AV": "593.7193",
"time": "2016-05-01 00:03:37"
},
{
"AM23SIG0206.AV": "593.6735",
"time": "2016-05-01 00:03:40"
},
{
"AM23SIG0206.AV": "593.625",
"time": "2016-05-01 00:03:43"
},
{
"AM23SIG0206.AV": "593.6062",
"time": "2016-05-01 00:03:46"
},
{
"AM23SIG0206.AV": "593.6062",
"time": "2016-05-01 00:03:49"
},
{
"AM23SIG0206.AV": "593.5442",
"time": "2016-05-01 00:03:52"
},
{
"AM23SIG0206.AV": "593.528",
"time": "2016-05-01 00:03:55"
},
{
"AM23SIG0206.AV": "593.4931",
"time": "2016-05-01 00:03:58"
},
{
"AM23SIG0206.AV": "593.4931",
"time": "2016-05-01 00:04:01"
},
{
"AM23SIG0206.AV": "593.4446",
"time": "2016-05-01 00:04:04"
},
{
"AM23SIG0206.AV": "593.4285",
"time": "2016-05-01 00:04:07"
},
{
"AM23SIG0206.AV": "593.3962",
"time": "2016-05-01 00:04:10"
},
{
"AM23SIG0206.AV": "593.38",
"time": "2016-05-01 00:04:13"
},
{
"AM23SIG0206.AV": "593.3774",
"time": "2016-05-01 00:04:16"
},
{
"AM23SIG0206.AV": "593.38",
"time": "2016-05-01 00:04:19"
},
{
"AM23SIG0206.AV": "593.3154",
"time": "2016-05-01 00:04:22"
},
{
"AM23SIG0206.AV": "593.3477",
"time": "2016-05-01 00:04:25"
},
{
"AM23SIG0206.AV": "593.3477",
"time": "2016-05-01 00:04:28"
},
{
"AM23SIG0206.AV": "593.3451",
"time": "2016-05-01 00:04:31"
},
{
"AM23SIG0206.AV": "593.3451",
"time": "2016-05-01 00:04:34"
},
{
"AM23SIG0206.AV": "593.3451",
"time": "2016-05-01 00:04:37"
},
{
"AM23SIG0206.AV": "593.3425",
"time": "2016-05-01 00:04:40"
},
{
"AM23SIG0206.AV": "593.4097",
"time": "2016-05-01 00:04:43"
},
{
"AM23SIG0206.AV": "593.4097",
"time": "2016-05-01 00:04:46"
},
{
"AM23SIG0206.AV": "593.4581",
"time": "2016-05-01 00:04:49"
},
{
"AM23SIG0206.AV": "593.4608",
"time": "2016-05-01 00:04:52"
},
{
"AM23SIG0206.AV": "593.5228",
"time": "2016-05-01 00:04:55"
},
{
"AM23SIG0206.AV": "593.5066",
"time": "2016-05-01 00:04:58"
},
{
"AM23SIG0206.AV": "593.5739",
"time": "2016-05-01 00:05:01"
},
{
"AM23SIG0206.AV": "593.6035",
"time": "2016-05-01 00:05:04"
},
{
"AM23SIG0206.AV": "593.6036",
"time": "2016-05-01 00:05:07"
},
{
"AM23SIG0206.AV": "593.6359",
"time": "2016-05-01 00:05:10"
},
{
"AM23SIG0206.AV": "593.6843",
"time": "2016-05-01 00:05:13"
},
{
"AM23SIG0206.AV": "593.7141",
"time": "2016-05-01 00:05:16"
},
{
"AM23SIG0206.AV": "593.7463",
"time": "2016-05-01 00:05:19"
},
{
"AM23SIG0206.AV": "593.749",
"time": "2016-05-01 00:05:22"
},
{
"AM23SIG0206.AV": "593.7787",
"time": "2016-05-01 00:05:25"
},
{
"AM23SIG0206.AV": "593.7974",
"time": "2016-05-01 00:05:28"
},
{
"AM23SIG0206.AV": "593.8297",
"time": "2016-05-01 00:05:31"
},
{
"AM23SIG0206.AV": "593.8782",
"time": "2016-05-01 00:05:34"
},
{
"AM23SIG0206.AV": "593.9241",
"time": "2016-05-01 00:05:37"
},
{
"AM23SIG0206.AV": "593.9105",
"time": "2016-05-01 00:05:40"
},
{
"AM23SIG0206.AV": "593.9752",
"time": "2016-05-01 00:05:43"
},
{
"AM23SIG0206.AV": "593.9887",
"time": "2016-05-01 00:05:46"
},
{
"AM23SIG0206.AV": "594.0049",
"time": "2016-05-01 00:05:49"
},
{
"AM23SIG0206.AV": "594.0049",
"time": "2016-05-01 00:05:52"
},
{
"AM23SIG0206.AV": "594.021",
"time": "2016-05-01 00:05:55"
},
{
"AM23SIG0206.AV": "594.0372",
"time": "2016-05-01 00:05:58"
},
{
"AM23SIG0206.AV": "594.021",
"time": "2016-05-01 00:06:01"
},
{
"AM23SIG0206.AV": "594.0695",
"time": "2016-05-01 00:06:04"
},
{
"AM23SIG0206.AV": "594.0856",
"time": "2016-05-01 00:06:07"
},
{
"AM23SIG0206.AV": "594.0857",
"time": "2016-05-01 00:06:10"
},
{
"AM23SIG0206.AV": "594.0857",
"time": "2016-05-01 00:06:13"
},
{
"AM23SIG0206.AV": "594.1476",
"time": "2016-05-01 00:06:16"
},
{
"AM23SIG0206.AV": "594.0830000000001",
"time": "2016-05-01 00:06:19"
},
{
"AM23SIG0206.AV": "594.1154",
"time": "2016-05-01 00:06:22"
},
{
"AM23SIG0206.AV": "594.1179",
"time": "2016-05-01 00:06:25"
},
{
"AM23SIG0206.AV": "594.1179",
"time": "2016-05-01 00:06:28"
},
{
"AM23SIG0206.AV": "594.0830000000001",
"time": "2016-05-01 00:06:31"
},
{
"AM23SIG0206.AV": "594.0830000000001",
"time": "2016-05-01 00:06:34"
},
{
"AM23SIG0206.AV": "594.0507",
"time": "2016-05-01 00:06:37"
},
{
"AM23SIG0206.AV": "594.0830000000001",
"time": "2016-05-01 00:06:40"
},
{
"AM23SIG0206.AV": "594.0830000000001",
"time": "2016-05-01 00:06:43"
},
{
"AM23SIG0206.AV": "594.0507",
"time": "2016-05-01 00:06:46"
},
{
"AM23SIG0206.AV": "594.0345",
"time": "2016-05-01 00:06:49"
},
{
"AM23SIG0206.AV": "594.0022",
"time": "2016-05-01 00:06:52"
},
{
"AM23SIG0206.AV": "593.9861",
"time": "2016-05-01 00:06:55"
},
{
"AM23SIG0206.AV": "593.9699",
"time": "2016-05-01 00:06:58"
},
{
"AM23SIG0206.AV": "593.9363",
"time": "2016-05-01 00:07:01"
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]
附件为对应的.json文件,其中包含由Python大数据模型预测生成的数据,供前端调用展示。
总结
以上介绍了基于HTML5、JS、jQuery和ECharts实现异步动态加载的方法,希望能为读者提供有益参考。如有任何问题,欢迎留言交流,作者将及时回复。
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