前言
先不说别的,上两个arco design table的bug。本来是写react table组件,然后看源码学习思路,结果看的我真的很想吐槽。(其他组件我在学习源码上受益匪浅,尤其是工程化arco-cli那部分,我自己尝试写的轮子也是受到很多启发,这个吐槽并不是真的有恶意,我对arco和腾讯的tdeisgn是有期待的,因为ant一家独大太久了,很期待新鲜的血液)
如果arco deisgn的团队看到这篇文章,请一定让写table的同学看一下!!!把多级表头的筛选 + 排序 + 固定逻辑好好梳理一下,目前的写法隐患太多了,我后面会写为什么目前的写法隐患很多,非常容易出bug!
1、这是在线bug demo codesandbox.io/s/jovial-ka…
bug显示
2、继续看,我筛选userInfo上,工资大于2000的行,根本没效果
在线bug 的demo codesandbox.io/s/competent…
、
说实话,我随便送给大家几个table的bug,都可以去给官方提pr了。(这个写table的人一定要好好的批评一下!!!!)
离谱的filter代码
filter是啥呢,我们看下图
这个表头的筛选我们简称为filter
首先官方把columns上所有的受控和非受控的filter收集起来,代码如下:
const { currentFilters, currentSorter } = getDefaultFiltersAndSorter(columns);
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columns我们假设长成这样:
const columns = [
{
title: "Name",
dataIndex: "name",
width: 140,
},
{
title: "User Info",
filters: [
{
text: "> 20000",
value: "20000",
},
{
text: "> 30000",
value: "30000",
},
],
onFilter: (value, row) => row.salary > value,
},
{
title: "Information",
children: [
{
title: "Email",
dataIndex: "email",
},
{
title: "Phone",
dataIndex: "phone",
},
],
},
]
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getDefaultFiltersAndSorter的代码如下,不想看细节的,我就说下结论,这个函数是把filters受控属性,filteredValue和非受控属性defaultFilters放到currentFilters对象里,然后导出,其中key可以简单认为是每个columns上的dataIndex,也就是每一列的唯一标识符。
currentSorter我们暂时不看,也是为排序的bug埋下隐患,我们这篇文章先不谈排序的bug。
function getDefaultFiltersAndSorter(columns) {
const currentFilters = {} as Partial>;
const currentSorter = {} as SorterResult;
function travel(columns) {
if (columns && columns.length > 0) {
columns.forEach((column, index) => {
const innerDataIndex = column.dataIndex === undefined ? index : column.dataIndex;
if (!column[childrenColumnName]) {
if (column.defaultFilters) {
currentFilters[innerDataIndex] = column.defaultFilters;
}
if (column.filteredValue) {
currentFilters[innerDataIndex] = column.filteredValue;
}
if (column.defaultSortOrder) {
currentSorter.field = innerDataIndex;
currentSorter.direction = column.defaultSortOrder;
}
if (column.sortOrder) {
currentSorter.field = innerDataIndex;
currentSorter.direction = column.sortOrder;
}
} else {
travel(column[childrenColumnName]);
}
});
}
}
travel(columns);
return { currentFilters, currentSorter };
}
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这里的已经为出bug埋下隐患了,大家看啊,它是递归收集所有columns上的filter相关的受控和非受控的属性,而且受控的属性会覆盖非受控。
这里没有单独区分受控的filter属性和非受控的属性就很奇怪。后面分析,因为arco deisgn有个专门处理受控和非受控的hooks,因为他现在不区分,还用错这个hooks,造成我看起来它的代码奇怪的要命!!
接着看!
然后,他用上面的currentFilters去
const [filters, setFilters] = useState
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接着看一下useColunms,这个跟filters后面息息相关,所以我们必须要看下useColumns的实现
const [groupColumns, flattenColumns] = useColumns
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简单描述一下useColumns的返回值 groupColumns, flattenColumns分别代表什么:
groupColumns,它将columns按行存储到数组里面,啥是按行呢,看下图
name、user info、Information、salary是第一行
Birthday、address是第二行,Email,phone也是第二行
city、road、no是第三行
flattenColumns是啥意思呢?就是columns叶子节点组成的数组,叶子节点是指所有columns中没有children属性的节点。以下是具体代码,有兴趣的可以看看,我们接着看,马上很奇怪的代码就要来了!
function useColumns
const {
components, // 覆盖原生表格标签
rowSelection, // 设置表格行是否可选,选中事件等
expandedRowRender, // 点击展开额外的行,渲染函数。返回值为 null 时,不会渲染展开按钮
expandProps = {}, // 展开参数
columns = [], // 外界传入的columns
childrenColumnName, // 默认是children
} = props;
// 下面有getFlattenColumns方法
// getFlattenColumns平铺columns,因为可能有多级表头,所以需要平铺
// getFlattenColumns,注意这个平铺只会搜集叶子节点!!!!
const rows: InternalColumnProps[] = useMemo(
() => getFlattenColumns(columns, childrenColumnName),
[columns, childrenColumnName]
);
// 是否是checkbox
const isCheckbox =
(rowSelection && rowSelection.type === 'checkbox') ||
(rowSelection && !('type' in rowSelection));
// 是否是radio
const isRadio = rowSelection && rowSelection.type === 'radio';
// 展开按钮列的宽度
const { width: expandColWidth } = expandProps;
// 是否有expand—row
const shouldRenderExpandCol = !!expandedRowRender;
const shouldRenderSelectionCol = isCheckbox || isRadio;
// 获取到自定义的操作栏,默认是selectNode和expandNode
const { getHeaderComponentOperations, getBodyComponentOperations } = useComponent(components);
const headerOperations = useMemo(
() =>
getHeaderComponentOperations({
selectionNode: shouldRenderSelectionCol ? 'holder_node' : '',
expandNode: shouldRenderExpandCol ? 'holder_node' : '',
}),
[shouldRenderSelectionCol, shouldRenderExpandCol, getHeaderComponentOperations]
);
const bodyOperations = useMemo(
() =>
getBodyComponentOperations({
selectionNode: shouldRenderSelectionCol ? 'holder_node' : '',
expandNode: shouldRenderExpandCol ? 'holder_node' : '',
}),
[shouldRenderSelectionCol, shouldRenderExpandCol, getBodyComponentOperations]
);
// rowSelection.fixed 表示checkbox是否固定在左边
const selectionFixedLeft = rowSelection && rowSelection.fixed;
// 选择列的宽度
const selectionColumnWidth = rowSelection && rowSelection.columnWidth;
const getInternalColumns = useCallback(
(rows, operations, index?: number) => {
const operationFixedProps: { fixed?: 'left' | 'right' } = {};
const _rows: InternalColumnProps[] = [];
rows.forEach((r, i) => {
const _r = { ...r };
if (!('key' in r)) {
_r.key = _r.dataIndex || i;
}
if (i === 0) {
_r.$$isFirstColumn = true;
if (_r.fixed === 'left') {
operationFixedProps.fixed = _r.fixed;
}
} else {
_r.$$isFirstColumn = false;
}
_rows.push(_r);
});
const expandColumn = shouldRenderExpandCol && {
key: INTERNAL_EXPAND_KEY,
title: INTERNAL_EXPAND_KEY,
width: expandColWidth,
$$isOperation: true,
};
const selectionColumn = shouldRenderSelectionCol && {
key: INTERNAL_SELECTION_KEY,
title: INTERNAL_SELECTION_KEY,
width: selectionColumnWidth,
$$isOperation: true,
};
if (selectionFixedLeft) {
operationFixedProps.fixed = 'left';
}
if (typeof index !== 'number' || index === 0) {
[...operations].reverse().forEach((operation) => {
if (operation.node) {
if (operation.name === 'expandNode') {
_rows.unshift({ ...expandColumn, ...operationFixedProps });
} else if (operation.name === 'selectionNode') {
_rows.unshift({ ...selectionColumn, ...operationFixedProps });
} else {
_rows.unshift({
...operation,
...operationFixedProps,
title: operation.name,
key: operation.name,
$$isOperation: true,
width: operation.width || 40,
});
}
}
});
}
return _rows;
},
[
expandColWidth,
shouldRenderExpandCol,
shouldRenderSelectionCol,
selectionColumnWidth,
selectionFixedLeft,
]
);
const flattenColumns = useMemo(
() => getInternalColumns(rows, bodyOperations),
[rows, getInternalColumns, bodyOperations]
);
// 把表头分组的 columns 分成 n 行,并且加上 colSpan 和 rowSpan,没有表头分组的话是 1 行。
// 获取column的深度
const rowCount = useMemo(
() => getAllHeaderRowsCount(columns, childrenColumnName),
[columns, childrenColumnName]
);
// 分行之后的rows
const groupColumns = useMemo(() => {
if (rowCount === 1) {
return [getInternalColumns(columns, headerOperations, 0)];
}
const rows: InternalColumnProps[][] = [];
const travel = (columns, current = 0) => {
rows[current] = rows[current] || [];
columns.forEach((col) => {
const column: InternalColumnProps = { ...col };
if (column[childrenColumnName]) {
// 求出叶子结点的个数就是colSpan
column.colSpan = getFlattenColumns(col[childrenColumnName], childrenColumnName).length;
column.rowSpan = 1;
rows[current].push(column);
travel(column[childrenColumnName], current + 1);
} else {
column.colSpan = 1;
// 这是
column.rowSpan = rowCount - current;
rows[current].push(column);
}
});
rows[current] = getInternalColumns(rows[current], headerOperations, current);
};
travel(columns);
return rows;
}, [columns, childrenColumnName, rowCount, getInternalColumns, headerOperations]);
return [groupColumns, flattenColumns];
}
export default useColumns;
function getFlattenColumns(columns: InternalColumnProps[], childrenColumnName: string) {
const rows: InternalColumnProps[] = [];
function travel(columns) {
if (columns && columns.length > 0) {
columns.forEach((column) => {
if (!column[childrenColumnName]) {
rows.push({ ...column, key: column.key || column.dataIndex });
} else {
travel(column[childrenColumnName]);
}
});
}
}
travel(columns);
return rows;
}