<template>
    <view class="content">
        <!-- #ifdef APP-PLUS || H5 -->
        <view @click="echarts.onClick" :prop="option" :change:prop="echarts.updateEcharts" id="echarts" class="echarts"></view>
        <button @click="changeOption">更新数据</button>
        <!-- #endif -->
        <!-- #ifndef APP-PLUS || H5 -->
        <view>非 APP、H5 环境不支持</view>
        <!-- #endif -->
    </view>
</template>

<script>
    export default {
        data() {
            return {
                option: {
                    title: {
                        text: 'ECharts 入门示例'
                    },
                    tooltip: {},
                    legend: {
                        data: ['销量']
                    },
                    xAxis: {
                        data: ["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"]
                    },
                    yAxis: {},
                    series: [{
                        name: '销量',
                        type: 'bar',
                        data: [5, 20, 36, 10, 10, 20]
                    }]
                }
            }
        },
        onLoad() {

        },
        methods: {
            changeOption() {
                const data = this.option.series[0].data
                // 随机更新示例数据
                data.forEach((item, index) => {
                    data.splice(index, 1, Math.random() * 40)
                })
            },
            onViewClick(options) {
                console.log(options)
            }
        }
    }
</script>

<script module="echarts" lang="renderjs">
    let myChart
    export default {
        mounted() {
            if (typeof window.echarts === 'function') {
                this.initEcharts()
            } else {
                // 动态引入较大类库避免影响页面展示
                const script = document.createElement('script')
                // view 层的页面运行在 www 根目录，其相对路径相对于 www 计算
                script.src = 'static/echarts.js'
                script.onload = this.initEcharts.bind(this)
                document.head.appendChild(script)
            }
        },
        methods: {
            initEcharts() {
                myChart = echarts.init(document.getElementById('echarts'))
                // 观测更新的数据在 view 层可以直接访问到
                myChart.setOption(this.option)
            },
            updateEcharts(newValue, oldValue, ownerInstance, instance) {
                // 监听 service 层数据变更
                myChart.setOption(newValue)
            },
            onClick(event, ownerInstance) {
                // 调用 service 层的方法
                ownerInstance.callMethod('onViewClick', {
                    test: 'test'
                })
            }
        }
    }
</script>

<style>
    .content {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
    }

    .echarts {
        margin-top: 100px;
        width: 100%;
        height: 300px;
    }
</style>