妙趣横生：利用Echarts实现SpreadJS引用从属关系的可视化魅力

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在金融行业，我们经常会有审计审查的需求，对某个计算结果进行审查，但是这个计算结果可能依赖多个单元格，而且会有会有多级依赖的情况，如果让我们的从业人员靠眼睛找，工作量巨大，而且准确性存疑，基本上死路一条，因此让整个审查过程可视化，迫在眉睫，现在我们利用纯前端表格和Echarts将审计审查过程可视化

一.首先我们先了解一下前端表格或Excel中引用和从属关系：
1.在单元格B1中设置公式 =SUM(A1)。 单元格A1是单元格B1的引用单元格（引用关系）
2.在单元格B1中设置公式 =SUM(A1)。 单元格B1是单元格A1的从属单元格（从属关系）

二.接下来我们看一下最终实现效果：

1.引用关系

2.从属关系

三.本次我们用的是Echarts的树图将引用和从属关系可视化，关于Echarts上手，大家去Echarts官网有完整上手教程，Echarts社区有很多开发者做的许多有趣又实用的demo，这里我们用的是树图

四.接下来我们要用纯前端表格控件的获取引用和从属关系的api将某个单元格的引用和从属关系顺藤摸瓜，刨根问题，刨到“祖坟”上，将这些关系，构造成Echarts树图的data结构，废话不说，直接上核心代码

// 递归构建追踪树
    buildNodeTreeAndPaint = (spreadSource, trackCellInfo) => {
        let info = this.getCellInfo(trackCellInfo);
        let sheetSource = spreadSource.getSheetFromName(info.sheetName);
        // 创建跟节点
        let rootNode = this.creatNode(info.row, info.col, sheetSource, 0, "");

        let name = rootNode.sheetName + "*" + rootNode.row + "*" + rootNode.col + "*" + Math.random().toString();
        let precedentsRootNode = '';
        let dependentsRootNode = '';
        if (this.state.trackType === "Precedents" || this.state.trackType === "Both") {
            this.getNodeChild(rootNode, sheetSource, "Precedents")
            debugger;
            console.log(rootNode)
            if (this.state.trackType === "Both") {
                let rootNodeChildren = JSON.parse(JSON.stringify(rootNode.children));
                rootNode.children = [];
                precedentsRootNode = JSON.parse(JSON.stringify(rootNode));
                precedentsRootNode.children.push({
                    name: "Precedents",
                    value: "Precedents",
                    children: rootNodeChildren
                })
                this.setState({
                    precedentsRootNode: JSON.parse(JSON.stringify(precedentsRootNode)),
                })
            }
        }
        if (this.state.trackType === "Dependents" || this.state.trackType === "Both") {
            this.getNodeChild(rootNode, sheetSource, "Dependents")
            console.log(rootNode)
            if (this.state.trackType === "Both") {
                let deepInfo = [1];
                let rootNodeChildren = JSON.parse(JSON.stringify(rootNode.children));
                rootNode.children = [];
                dependentsRootNode = JSON.parse(JSON.stringify(rootNode));
                dependentsRootNode.children.push({
                    name: "Dependents",
                    value: "Dependents",
                    children: rootNodeChildren
                })
                this.setState({
                    dependentsRootNode: JSON.parse(JSON.stringify(dependentsRootNode)),
                })
            }



        }
        if (this.state.trackType === "Both") {
            precedentsRootNode.children = precedentsRootNode.children.concat(dependentsRootNode.children);
            // let bothRootNode = precedentsRootNode.children[0].children.concat(dependentsRootNode.children[0].children)
            this.setState({
                rootNode1: JSON.parse(JSON.stringify(precedentsRootNode)),
            })
        } else {
            this.setState({
                rootNode1: JSON.parse(JSON.stringify(rootNode)),
            })
        }
    }
    creatNode = (row, col, sheet, deep, trackType) => {
        let node = {
            value: sheet.getValue(row, col),
            position: sheet.name() + "!" + GC.Spread.Sheets.CalcEngine.rangeToFormula(new GC.Spread.Sheets.Range(row, col, 1, 1)),
            deep: deep,
            name: `${sheet.name()}!${GC.Spread.Sheets.CalcEngine.rangeToFormula(new GC.Spread.Sheets.Range(row, col, 1, 1))}\nvalue:${sheet.getValue(row, col)}`,
            sheetName: sheet.name(),
            row: row,
            col: col,
            trackType: trackType
        };
        return node;
    }
    getNodeChild = (rootNode, sheet, trackType) => {
        let childNodeArray = [];
        let children = [];
        let row = rootNode.row, col = rootNode.col, deep = rootNode.deep;
        if (trackType == "Precedents") {
            children = sheet.getPrecedents(row, col);
        }
        else {
            children = sheet.getDependents(row, col);
        }
        // let self = this;
        if (children.length >= 1) {
            children.forEach((node) => {
                let row = node.row,
                    col = node.col,
                    rowCount = node.rowCount,
                    colCount = node.colCount,
                    _sheet = sheet.parent.getSheetFromName(node.sheetName);
                if (rowCount > 1 || colCount > 1) {
                    for (let r = row; r < row + rowCount; r++) {
                        for (let c = col; c < col + colCount; c++) {
                            let newNode = this.creatNode(r, c, _sheet, deep + 1, trackType)
                            // if (deep < self.maxDeep) {
                            this.getNodeChild(newNode, _sheet, trackType);
                            // }
                            childNodeArray.push(newNode);
                        }
                    }
                } else {
                    let newNode = this.creatNode(row, col, _sheet, deep + 1, trackType)
                    // if (deep < self.maxDeep) {
                    this.getNodeChild(newNode, _sheet, trackType);
                    // }
                    childNodeArray.push(newNode);
                }
            });
        }
        rootNode.children = childNodeArray;
    }

五.将构造好的引用和从属树rootNode在Echarts中渲染

myChart.setOption(
            (option = {
                tooltip: {
                    trigger: 'item',
                    triggerOn: 'mousemove'
                },
                series: [
                    {
                        type: 'tree',
                        data: [this.state.rootNode1],
                        top: '1%',
                        left: '15%',
                        bottom: '1%',
                        right: '7%',
                        symbolSize: 10,
                        orient: this.state.trackType === 'review'?'LR':'RL',
                        label: {
                            position: this.state.trackType === 'review'?'left':'right',
                            verticalAlign: 'middle',
                            align: this.state.trackType === 'review'?'right':'left',
                        },
                        leaves: {
                            label: {
                                position: this.state.trackType === 'review'?'right':'left',
                                verticalAlign: 'middle',
                                align: this.state.trackType === 'review'?'left':'right'
                            }
                        },
                        emphasis: {
                            focus: 'descendant'
                        },
                        // layout: 'radial',
                        expandAndCollapse: true,
                        animationDuration: 550,
                        animationDurationUpdate: 750
                    }
                ]
            })
        );

        option && myChart.setOption(option);

以上就是实现报表中公式引用从属关系Echarts可视化的核心实现逻辑，由于工程较大，如需获取源码，可私信获取。

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