Echarts 地图（map）插件之 鼠标HOVER和tooltip自定义数据

在项目开发中，有需要用到地图的地方，百度的echarts地图插件就是个不错的选择，

这里总结一下地图自定义鼠标HOVER时的事件和自定义tooltip数据；

一、鼠标HOVER时的事件：

参照官方文档解释,

　　

可以看出这款插件有丰富的鼠标事件可供选择：

　　调用鼠标HOVER事件的方法很简单,只需把以下代码放到charts（）调用的函数的最底部即可

　　

 var ecConfig = require('echarts/config');
     myChart.on(ecConfig.EVENT.HOVER, function (param){
         var selected = param.name;
         //write your code here
         //console.log(selected);打印参数
         //hoverin();调用自定义函数
         //document.getElementById('wrong-message').innerHTML = str;
     });

二、tooltip的数据自定义；

　　这块研究了一段时间，都是浅浅的研究，

　　tooltip就是鼠标放在地图上显示的提示，如图红框里的就是tooltip的内容；

这里总结的主要是这块数据的自定义;

官方文档介绍说需要修改formatter；

option = {
    tooltip : {
        trigger: 'item',
        formatter: '{b}'
    }
},

文档中说明：formatter支持函数自定义数据及模板

那么，我们可以把上面的代码改造一下：

首先自定义一些数据：（例子）这里是图片的url

var $imgs = [
        {area: '北京', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '天津', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '上海', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '重庆', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '河北', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '河南', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '云南', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '辽宁', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '黑龙江', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '湖南', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '安徽', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '山东', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '*', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '江苏', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '浙江', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '江西', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '湖北', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '广西', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '甘肃', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '山西', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '内蒙古', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '陕西', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '吉林', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '福建', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '贵州', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '广东', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '青海', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '*', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '四川', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '宁夏', url:'http://www.blingschool.com/template/33/pc/images//logo2.png'},
        {area: '海南', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '*', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '香港', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'},
        {area: '澳门', url:'http://www.blingschool.com/template/33/pc/images//logo3.png'}
    ];

当鼠标HOVER的时候，去判断取哪些值来显示；

tooltip : {
            trigger: 'item',
            formatter: function (params,ticket,callback){
                var $pna = params.name;
                var res = '';

                for(var i = 0;i<$imgs.length;i++){
                    if($imgs[i].area == $pna){
                        res = '<img src="'+ $imgs[i].url +'" />';//设置自定义数据的模板，这里的模板是图片
                        //console.log(res);
                        break;
                    }
                }

                setTimeout(function (){
                    // 仅为了模拟异步回调
                    callback(ticket, res);//回调函数，这里可以做异步请求加载的一些代码
                }, 1000)
                return 'loading';
            }
        }

最终完成的效果如图