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echarts使用中的常见的问题
- 1.给折线图画一条水准线
- 2.图表自适应容器
- 3.x轴文字过长显示不全的问题
- 4.echarts的点击事件
- 5.数据中如果有空值时 如何实现连接空值或者显示断开
- 6.关于echarts地图js文件制作问题
- 7.echarts引入地图文件 绘制地图
- 8.使用echarts绘制x轴可以自由伸缩的图表
1.给折线图画一条水准线
通常用echarts 我们会绘制折线图 需要一条水准线来明显区分数据echarts有一个属性 markLine
加水准线 我们只需要在series下 的 对象加入下面代码 具体设置样式 可以上echarts.baidu.com 查看配置项手册
markLine:{
lineStyle:{
//color:'#fdfd30',
color:'#ff0a0a',
width:1,
type:'dashed',
opacity:1
},
itemStyle: {
normal: {
label:{
color:'#00deff'
}
}
},
data:[{name:'基准线',yAxis: baseLineNum}]
} 这里的baseLineNum就是基准线 相对y轴的数值 lineStyle可以设置基准线的类型（-type）宽度 透明度
2.echarts图表自适应容器
在图标对像设置完配置项后 监听 window resize事件 然后调用echarts自带的resize()函数即可
mychartObj.setOption(option);
window.addEventListener("resize",function(){
mychartObj.resize();
}); 3.x轴文字过长显示不全的问题
这个问题应该比较常见 当我们遇到那种 x轴是日期 又特别多的时候 就可以用这个方法 把x轴的文本 label 倾斜一下就好啦
就像这样的 这里的角度范围是 （90–90度 支持number类型）
设置xAxis 下面的axisLabel 的rotate属性
例如
axisLabel: {
interval:0,
rotate:45
} 然后你会看到 倾斜了是可以看全了 但是图表右边超出了 这个时候我们可以设置grid属性 的left值大一点 或者 让旋转角度大一点如 这里 我们把角度设置为-90 即可
4.echarts点击事件
其实跟我们平常写的点击时间一样 echarts的点击事件
echartsObj.on("click",function(para){
//事件执行代码
})5.数据中如果有空值时 如何实现连接空值或者显示断开
这个应该不常用到 但是一旦用到的话 很少有人 我也是 一次一个同事问我 这个 中间又一个值为空 怎么让她不断开显示 废了一些功夫 查到了 connectNulls这个属性 echarts2 好像还没有
connectNulls：true;
如果不给这个属性的话 默认是断开的
不设置如图
设置如图
6.关于echarts地图js文件制作问题
我们使用echarts绘制地图的时候 是需要引入 相应的地图js文件的 这些js文件也就是地图的经纬度数据 之前我们是直接可以在echarts官网下载这些js或者json文件的 但是现在却找不到了
而我之前的一个项目刚好需要 苦寻无果 于是问了问前辈 说可以自己制作这个js文件的 然后把方法分享给大家
其实很简单 我们找一个地图js文件案例 分析一下 然后 通过百度地图 或者高德地图把行政区域的轮廓的经纬度获取到 然后放到相应的位置即可
https://github.com/kidddfu/echarts-map/tree/master/js
这个网址里面是有map.js 以及各个省份的js 如果需要省份一下的地图js就需要我们自己获取经纬度然后制作了
以北京zhengzhou.js为例
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['exports', 'echarts'], factory);
} else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {
// CommonJS
factory(exports, require('echarts'));
} else {
// Browser globals
factory({}, root.echarts);
}
}(this, function (exports, echarts) {
var log = function (msg) {
if (typeof console !== 'undefined') { console && console.error && console.error(msg); }
}
if (!echarts) {
log('ECharts is not Loaded');
return;
}
if (!echarts.registerMap) {
log('ECharts Map is not loaded')
return;
}
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}));我们需要注意的就是echarts.registerMap(“郑州”，{“type”:”FeatureCollection”,”features”:[{“type”:”Feature”,”id”:”410104”,”properties”:{}]})这个函数
我们需要注意的就是红色标出来的
这里的zhegnzhou 就是我们要使用地图的时候要要配置的名字 这两者要保持一致
name 是这个区的名字 你这里写的什么地图上就会显示什么
cp是这个区的中心点经纬度 通常 我们会在地图上的某个区放一个气泡 或者数据显示的框框什么的就是这个来控制位置的
coordinates这个里面放的是这个区的经纬度信息 下面会给出怎么获取
怎么获取区 县的经纬度信息呢
1.通过百度地图的Boundary()函数 可以获取到行政区域的经纬度信息 然后用正则转为我们需要的格式即可
这是我写的一个demo 其实也很简单 需要的同学可以用
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>百度离线版DEMO</title>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=V6RjjChFXrifV2z41z0sYQEO"></script>
</head>
<body>
<div style="width:800px;height:620px;border:1px solid gray" id="container"></div>
</body>
</html>
<script type="text/javascript">
var container=document.getElementById('container')
var map = new BMap.Map("container",{minZoom:5,maxZoom:18});
var point = new BMap.Point(113.682327,34.753759); // 创建点坐标
map.centerAndZoom(point,11); // 初始化地图,设置中心点坐标和地图级别。
map.addControl(new BMap.NavigationControl());
map.enableScrollWheelZoom(); // 启用滚轮放大缩小。
map.enableKeyboard(); // 启用键盘操作。
var marker = new BMap.Marker(point);
map.addOverlay(marker);
marker.enableDragging();
marker.addEventListener("dragend", function(e){
console.log('lng:'+e.point.lng+','+'lat:'+e.point.lat)
})
var a='中原区 二七区 管城回族区 金水区 上街区 惠济区 中牟县 巩义市 荥阳市 新密市 新郑市 登封市';
var lyCity=a.split(" ");
for(var i=0;i<lyCity.length;i++){
getBoundary(lyCity[i]);
}
function getBoundary(name){
var bdary = new BMap.Boundary();
bdary.get(name, function(rs){ //获取行政区域
var count = rs.boundaries.length; //行政区域的点有多少个
var pointArray = [];
for (var i = 0; i < count; i++) {
//console.log(name,'{"lng":'+rs.boundaries[i].replace(/,/g,',"lat":').replace(/;/g,'},{"lng":')+"}");
console.log(name,'['+rs.boundaries[i].replace(/;/g,'],[')+']');
var ply = new BMap.Polygon(rs.boundaries[i], {strokeWeight: 2, strokeColor: "#ff0000",fillColor:'transparent'}); //建立多边形覆盖物
map.addOverlay(ply); //添加覆盖物
pointArray = pointArray.concat(ply.getPath());
}
map.setViewport(pointArray);
});
}
这里打印出来的就是我们需要的信息 然后在js文件的"features"数组里复制一个对象
</script>
2.同理高德地图也有一个 getBoundry() 你传入一个 城市或者区县名字 他就可以把轮廓画出来 并可以给出经纬度信息 与方法1 原理是一样的 也很简单
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>高德地图demo</title>
<script type="text/javascript" src="http://webapi.amap.com/maps?v=1.4.3&key=fb000f0d2955080016e651b876b14181"></script>
</head>
<body>
<div style="width:800px;height:620px;border:1px solid gray" id="container"></div>
</body>
<script type="text/javascript">
//初始化地图对象，加载地图
var district, map = new AMap.Map("container", {
resizeEnable: true,
center: [116.397428, 39.90923],//地图中心点
zoom: 10 //地图显示的缩放级别
});
addBeiJing();
function addBeiJing() {
//加载行政区划插件
AMap.service('AMap.DistrictSearch', function() {
var opts = {
subdistrict: 1, //返回下一级行政区
extensions: 'all', //返回行政区边界坐标组等具体信息
//level: 'country' //查询行政级别为 市
};
//实例化DistrictSearch
district = new AMap.DistrictSearch(opts);
district.setLevel('country');
var a='老城区 西工区 瀍河回族区 涧西区 吉利区 洛龙区 孟津县 新安县 栾川县 嵩县 汝阳县 宜阳县 洛宁县 伊川县 偃师市';
var lyCity=a.split(" ");
for(var i=0;i<lyCity.length;i++){
getBoundary(lyCity[i]);
}
function getBoundary(name){
//行政区查询
district.search(name, function(status, result) {
// for(var i=0;i<result.length;i++){
//
// }
var bounds = result.districtList[0].boundaries;
var polygons = [];
if (bounds) {
for (var i = 0, l = bounds.length; i < l; i++) {
//生成行政区划polygon
var polygon = new AMap.Polygon({
map: map,
strokeWeight: 1,
path: bounds[i],
fillOpacity: 0.7,
fillColor: '#CCF3FF',
strokeColor: '#CC66CC'
});
//console.log(name,bounds[i]);
//console.log(name,"{lng:"+bounds[i].lng+",lat:"+bounds[i].lat+"}");
var str="";
for(var j=0;j<bounds[i].length;j++){
str+='['+bounds[i][j].lng+',lat:'+bounds[i][j].lat+'],'
}
console.log(name,str);
polygons.push(polygon);
}
map.setFitView();//地图自适应
}
});
}
});
}
</script>
</html>
这个打印出来末尾会多一个逗号 也可以通过字符串截取去掉 7.echarts引入地图文件 绘制地图
完成我们上一部的制作后 比如我们要绘制郑州各个区域的echarts地图 怎么做呢
1.引入echarts.js
2.引入地图js文件
具体代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="jquery.min.js"></script>
<script src="echarts.js"></script>
<script src="zhengzhou.js"></script>
</head>
<body>
<div id="map" style="width:70%;height:500px;"></div>
<script>
var chart = echarts.init(document.getElementById("map"));
var option={
title : {
text : ''
},
tooltip : {
trigger: 'item'
},
legend:{
show:false,
},
series: [
{
type: 'map',
name:"退服占比",
map: '郑州',
roam: true,
zoom: 1.1,//设置缩放比例
scaleLimit: {
min: 1,
max: 3
},//滚轮放大缩小的极限
//center:[114.026063,34.022956],//地图中心点
itemStyle: {
//normal 是图形在默认状态下的样式；
normal: {
show: true,
areaColor:"#CECECE",
borderColor:"#03001a",
borderWidth:1
},
//emphasis 是图形在高亮状态下的样式，比如在鼠标悬浮或者图例联动高亮时。
emphasis: {
show: true
}
},
showLegendSymbol:false,
label: {
normal: {
show: true,
textStyle:{
color:'#000',
fontSize:12,
fontWeight:'bold'
}
},
emphasis: {
show: true,
textStyle:{
color: "#fff"
}
}
},
data:[]
}
]
};
chart.setOption(option);
</script>
</body>
</html>
8.使用echarts绘制x轴可以自由伸缩的图表（通过滚轮或者手势触发）
效果如下
这里其关键作用的就是dataZoom属性
demo示例echarts官网上也有 这里就不放我的代码了
官网demo传送门：http://www.echartsjs.com/gallery/editor.html?c=doc-example/scatter-dataZoom-all
这篇文章主要是讲我前一个项目用到的 以及当时出现的比较常用而又不好找的属性设置 放出来 也是对前一个项目的总结
希望能帮到大家 ，当然项目中遇到的问题 远不止这些 以后会有慢慢补充 。