做项目用到echarts2.2.7版本做树图,遇到点击树图节点“更改样式”(并不能更改样式,只能换图标/图片),百度、谷歌搜索后均没找到解决方案。后来苦苦探索,终于找到解决入口,特地分享给大家以供参考,吐槽一下echarts的api真的没有highcharts人性化和易找。

  //贴出关键点!
    function clickFun(param) {
        console.log(param);
        param.data.symbol = 'p_w_picpath://http://www.viastreaming.com/p_w_picpaths/apple_logo2.png';
        //远程加载图片最好先预加载过来,避免下载图标延迟。 /**var oImg = new Image();oImg.src = img;**/
        console.log(param.data.cusField);
        chart.refresh(); //一定要refresh,否则不起作用
    }

以下是完整代码,里面有备注:





    
    echarts demo
    
    
    
    var chart;
    require.config({
        paths: {
            echarts: 'http://echarts.baidu.com/build/dist'
        }
    });
    require(['echarts', 'echarts/chart/tree'], function(ec) {
        chart = ec.init($("#main")[0]);
        chart.setOption(option);
        var ecConfig = require('echarts/config');
        chart.on(ecConfig.EVENT.CLICK, clickFun); //也可以注册其他时间 hover 、mouseout等
    })


    var option = {
        tooltip: {
            trigger: 'item',
            formatter: '{b}:{c}',
            hideDelay: 0 // chart.refresh();刷新时会维持当时图表的所有状态,所以设置隐藏延迟为0,否则在快速选择另一个节点时(尤其是数据比较多时)导致无法显示选择中的tooltip
            //无法完全避免但是很大减轻了副作用
        },
        series: [{
            name: '树图',
            type: 'tree',
            orient: 'horizontal', // vertical horizontal
            rootLocation: { x: '10%', y: '60%' }, // 根节点位置  {x: 'center',y: 10}
            nodePadding: 20, //智能定义全局最小节点间距,不能定义层级节点间距,有点搓。
            symbol: 'circle',
            symbolSize: 40,
            roam: true,
            data: [{
                name: '手机',
                value: 6,
                symbolSize: [90, 70],
                cusField: 'category',
                symbol: 'p_w_picpath://http://www.iconpng.com/png/ecommerce-business/iphone.png',
                itemStyle: {
                    normal: {
                        label: {
                            show: true,
                            position: 'right',
                            formatter: '{b}'
                        }
                    }
                },
                children: [{
                        name: '小\n米', //由于label的formatter存在bug,所以无法通过html进行格式化,如果要换行要用\n
                        value: 4,
                        symbol: 'p_w_picpath://http://pic.58pic.com/58pic/12/36/51/66d58PICMUV.jpg',
                        symbolSize: [60, 60],
                        cusField: 'product',
                        children: [{
                            name: '小米11',
                            symbol: 'circle',
                            cusField: 'product', //自定义属性,演示用,实际开发中可以在后台建模产生series整个data时增加而外属性以供使用
                            itemStyle: {
                                normal: {
                                    label: {
                                        show: true,
                                        position: 'bottom',
                                        formatter: '{b}--->>>'
                                    }
                                }
                            }
                        }],
                        itemStyle: {
                            normal: {
                                label: {
                                    show: true,
                                    position: 'right',
                                    formatter: '{b}--->>>' //有bug,formatter不起作用,这个bug看网友求助已经很久了,但是后面更新的版本一直没有解决
                                }
                            }
                        }
                    },
                    {
                        name: '苹果',
                        symbol: 'p_w_picpath://http://www.viastreaming.com/p_w_picpaths/apple_logo2.png',
                        symbolSize: [60, 60],
                        cusField: 'product',
                        itemStyle: {
                            normal: {
                                label: {
                                    show: false
                                }

                            }
                        },
                        value: 4
                    }

                ]
            }]
        }]
    };
    //关键点!
    function clickFun(param) {
        console.log(param);
        param.data.symbol = 'p_w_picpath://http://www.viastreaming.com/p_w_picpaths/apple_logo2.png';
         //远程加载图片最好先预加载过来,避免下载图标延迟。 var oImg = new Image();oImg.src = img;
        console.log(param.data.cusField);
        chart.refresh(); //一定要refresh,否则不起作用
    }
    



    
    

echarts2.* tree树形图节点点击事件和节点点击图标更改_第1张图片

上面是我项目实现截图,截图软件有点搓,部分线条没了。上面实现的是hover 和click时换成苹果图标。(目前已经去掉hover事件了,原因见下方)


注意:对于chart.refresh()操作尽量不要在hover和mouseout事件里用!否则会导致不停的刷新(只要鼠标在图标上稍微动一下会不断的触发hover),会有一种卡顿的感觉,而且会导致tooltip不能及时出现或被卡在一个节点不消失。(本想设置在同一节点hover没有mouseout之前只触发一次,但是很奇怪第一次hover时鼠标没有离开节点也会触发mouseout一次,比较难控制)。