Bagaimana untuk mencapai penetapan pengepala jadual dalam tindak balas-Soal Jawab bahagian hadapan-php.cn

Cara melaksanakan pengepala jadual tetap dalam React: 1. Laksanakan pengepala jadual tetap melalui komponen Jadual Ant Design 2. Gunakan "rc-table" untuk melaksanakan pengepala jadual tetap pada terminal mudah alih; acara onscroll, tukar atribut scrollLeft div.

Bagaimana untuk mencapai penetapan pengepala jadual dalam tindak balas

Persekitaran pengendalian tutorial ini: Sistem Windows 10, bertindak balas versi 18.0.0, komputer Dell G3.

Bagaimana untuk membetulkan pengepala dalam tindak balas?

Lajur tetap/lajur terkunci jadual tindak balas

Komponen Jadual Ant Design sangat mudah digunakan Ia mempunyai fungsi pengepala tetap dan lajur berkunci, tetapi Ant Design Mobile tidak mempunyai Komponen meja. Untuk melaksanakan fungsi pengepala jadual tetap dan lajur terkunci pada terminal mudah alih, anda sepatutnya boleh menggunakan rc-table, atau sudah tentu anda boleh menulisnya sendiri.

Dengan menganalisis Jadual AntD, kita dapat melihat bahawa jadual dengan pengepala tetap terdiri daripada dua teg yang masing-masing bersarang dalam div mengandungi < ;thead>, di bawah ialah kandungan jadual, hanya mengandungi . Anda harus mendengar acara onscroll div di bawah dan menukar atribut scrollLeft div di atas, supaya apabila jadual ditatal secara mendatar, pengepala jadual juga akan menatal secara serentak. Lajur tetap dicapai dengan menetapkan kedudukan sifat CSS th dan td kepada melekit dan menetapkan kiri atau kanan kepada 0. Pada masa yang sama, tetapkan indeks-z supaya lajur berkunci sentiasa dipaparkan di bahagian atas.

Setelah anda memahami prinsipnya, ia akan menjadi lebih mudah untuk menulis kod.

components/ScrollableTable/interface.tsx

import * as React from &#39;react&#39;;
export declare type AlignType = &#39;left&#39; | &#39;center&#39; | &#39;right&#39;;
export interface ColumnType {
  align?: AlignType;
  className?: string;
  dataKey?: string;
  fixed?: boolean;
  title?: React.ReactNode;
  width?: number;
  render?: (value: any, record: any, index: number) => React.ReactNode;
}
export interface TableProps {
  className?: string;
  style?: React.CSSProperties;
  columns?: ColumnType[];
  dataSource?: any[];
  width?: number;
  height?: number;
}

components/ScrollableTable/index.tsx

import React, { FunctionComponent, useRef } from &#39;react&#39;;
import { TableProps, ColumnType } from &#39;./interface&#39;;
import &#39;./index.less&#39;;
const ScrollableTable: FunctionComponent<any> = (props: TableProps) => {
  const style: React.CSSProperties = props.style || {};
  const maxHeight: string = props.width ? (props.height + &#39;px&#39;) : &#39;unset&#39;;
  const columns: ColumnType[] = props.columns || [];
  const dataSource: any[] = props.dataSource || [];
  let maxWidth: number = 0;
  if (props.width) style.width = props.width;
  if (columns.length === 0) {
    columns.push({
      dataKey: &#39;key&#39;
    });
  }
  columns.forEach((column: ColumnType) => {
    const width: number = column.width || 50;
    maxWidth += width;
  });
  const fixedColumns: number[][] = getFixedColumns(columns);
  const leftFixedColumns: number[] = fixedColumns[0];
  const rightFixedColumns: number[] = fixedColumns[1];
  const tableBody: any = useRef();
  const handleScroll = (target: any) => {
    const scrollLeft: number = target.scrollLeft;
    const tableHeaders: any = target.parentElement.getElementsByClassName(&#39;st-table-header&#39;);
    if (tableHeaders.length > 0) {
      tableHeaders[0].scrollLeft = scrollLeft;
    }
  };
  return (
    <div
      className={classNames(&#39;st-table-container&#39;, props.className)}
      style={style}
    >
      <div className="st-table-header">
        <table>
          <colgroup>
            {
              renderCols(columns)
            }
          </colgroup>
          <thead className="st-table-thead">
            <tr>
              {
                columns.map((column: ColumnType, index: number) => {
                  const align: any = column.align || undefined;
                  const title: React.ReactNode = column.title || &#39;&#39;;
                  const fixed: string = leftFixedColumns.includes(index) ? &#39;left&#39; : (rightFixedColumns.includes(index) ? &#39;right&#39; : &#39;&#39;);
                  const fixedClassName: string = fixed ? (&#39;st-table-cell-fix-&#39; + fixed) : &#39;&#39;;
                  return (
                    <th
                      key={index}
                      className={classNames(&#39;st-table-cell&#39;, fixedClassName, column.className)}
                      style={{textAlign: align}}
                    >
                      {title}
                    </th>
                  );
                })
              }
            </tr>
          </thead>
        </table>
      </div>
      <div
        ref={tableBody}
        className="st-table-body"
        style={{maxHeight: maxHeight}}
        onScroll={(e: any) => handleScroll(e.currentTarget)}
      >
        <table style={{width: maxWidth, minWidth: &#39;100%&#39;}}>
          <colgroup>
              {
                renderCols(columns)
              }
            </colgroup>
            <tbody className="st-table-tbody">
              {
                dataSource.map((record: any, index: number) => (
                  <tr key={index} className="st-table-row">
                    {
                      renderCells(columns, leftFixedColumns, rightFixedColumns, record, index)
                    }
                  </tr>
                ))
              }
            </tbody>
        </table>
      </div>
    </div>
  );
};
function classNames(...names: (string | undefined)[]) {
  const currentNames: string[] = [];
  names.forEach((name: (string | undefined)) => {
    if (name) currentNames.push(name);
  });
  return currentNames.join(&#39; &#39;);
}
function getFixedColumns(columns: ColumnType[]) {
  const total: number = columns.length;
  const leftFixedColumns: number[] = [];
  const rightFixedColumns: number[] = [];
  if (columns[0].fixed) {
    for (let i = 0; i < total; i++) {
      if (columns[i].fixed) {
        leftFixedColumns.push(i);
      } else {
        break;
      }
    }
  }
  if (columns[total - 1].fixed) {
    for (let i = total - 1; i >= 0; i--) {
      if (columns[i].fixed) {
        if (!leftFixedColumns.includes(i)) rightFixedColumns.push(i);
      } else {
        break;
      }
    }
  }
  return [leftFixedColumns, rightFixedColumns];
}
function renderCols(columns: ColumnType[]) {
  return columns.map((column: ColumnType, index: number) => {
    const width: number = column.width || 50;
    return (
      <col
        key={index}
        style={{width: width, minWidth: width}}
      />
    );
  });
}
function renderCells(columns: ColumnType[], leftFixedColumns: number[], rightFixedColumns: number[], record: any, index: number) {
  return columns.map((column: ColumnType, index: number) => {
    const align: any = column.align || undefined;
    const fixed: string = leftFixedColumns.includes(index) ? &#39;left&#39; : (rightFixedColumns.includes(index) ? &#39;right&#39; : &#39;&#39;);
    const className: string = classNames(&#39;st-table-cell&#39;, column.className, fixed ? (&#39;st-table-cell-fix-&#39; + fixed) : &#39;&#39;);
    const rawValue: any = (column.dataKey && column.dataKey in record) ? record[column.dataKey] : undefined;
    let value: any = undefined;
    if (column.render) {
      value = column.render(rawValue, record, index);
    } else {
      value = (rawValue === undefined || rawValue === null) ? &#39;&#39; : String(rawValue);
    }
    return (
      <td
        key={index}
        className={className}
        style={{textAlign: align}}
      >
        {value}
      </td>
    );
  });
}
export default ScrollableTable;

components/ScrollableTable/index.less

.st-table-container {
  border: 1px solid #f0f0f0;
  border-right: 0;
  border-bottom: 0;
  font-size: 14px;
  .st-table-header {
    border-right: 1px solid #f0f0f0;
    overflow: hidden;
    table {
      border-collapse: separate;
      border-spacing: 0;
      table-layout: fixed;
      width: 100%;
      thead.st-table-thead {
        tr {
          th.st-table-cell {
            background: #fafafa;
            border-bottom: 1px solid #f0f0f0;
            border-right: 1px solid #f0f0f0;
            color: rgba(0, 0, 0, .85);
            font-weight: 500;
            padding: 8px;
            text-align: left;
            &:last-child {
              border-right: 0;
            }
          }
        }
      }
    }
  }
  .st-table-body {
    overflow: auto scroll;
    border-bottom: 1px solid #f0f0f0;
    border-right: 1px solid #f0f0f0;
    table {
      border-collapse: separate;
      border-spacing: 0;
      table-layout: fixed;
      tbody.st-table-tbody {
        tr.st-table-row {
          td.st-table-cell  {
            border-bottom: 1px solid #f0f0f0;
            border-right: 1px solid #f0f0f0;
            color: rgba(0, 0, 0, .65);
            padding: 8px;
            text-align: left;
            &:last-child {
              border-right: 0;
            }
          }
          &:last-child {
            td.st-table-cell  {
              border-bottom: 0;
            }
          }
        }
      }
    }
  }
  table {
    .st-table-cell {
      &.st-table-cell-fix-left {
        background: #fff;
        position: sticky;
        left: 0;
        z-index: 2;
      }
      &.st-table-cell-fix-right {
        background: #fff;
        position: sticky;
        right: 0;
        z-index: 2;
      }
    }
  }
}

Salin selepas log masuk

Kemudian anda boleh menggunakannya seperti ini:

views/Test/index.tsx
import React, { FunctionComponent } from &#39;react&#39;;
import Page from &#39;../../components/Page&#39;;
import ScrollableTable from &#39;../../components/ScrollableTable&#39;;
import StoreProvider from &#39;../../stores/products/context&#39;;
import &#39;./index.less&#39;;
const Test: FunctionComponent<any> = (props: any) => {
  let records: any[] = [{
    id: 1,
    productName: &#39;淡泰&#39;,
    amount1: 198,
    amount2: 200,
    amount3: 205.5,
    currency: &#39;人民币&#39;,
    ca: &#39;Amy&#39;
  }, {
    productName: &#39;方润&#39;,
    amount1: 105.5,
    amount2: 100,
    amount3: 108,
    currency: &#39;港元&#39;,
    ca: &#39;Baby&#39;
  }, {
    productName: &#39;医疗基金-1&#39;,
    amount1: 153,
    amount2: 150,
    amount3: 155,
    currency: &#39;人民币&#39;,
    ca: &#39;Emily&#39;
  }, {
    productName: &#39;医疗基金-2&#39;,
    amount1: 302,
    amount2: 300,
    amount3: 290,
    currency: &#39;美元&#39;,
    ca: &#39;Baby&#39;
  }, {
    productName: &#39;医疗基金-3&#39;,
    amount1: 108.8,
    amount2: 100,
    amount3: 130,
    currency: &#39;人民币&#39;,
    ca: &#39;Amy&#39;
  }, {
    productName: &#39;医疗基金-4&#39;,
    amount1: 205,
    amount2: 200,
    amount3: 208,
    currency: &#39;美元&#39;,
    ca: &#39;吴丹&#39;
  }, {
    productName: &#39;医疗基金-5&#39;,
    amount1: 315.5,
    amount2: 300,
    amount3: 280,
    currency: &#39;人民币&#39;,
    ca: &#39;Baby&#39;
  }, {
    productName: &#39;医疗基金-6&#39;,
    amount1: 109,
    amount2: 95,
    amount3: 106,
    currency: &#39;人民币&#39;,
    ca: &#39;Emily&#39;
  }, {
    productName: &#39;恒大私募债&#39;,
    amount1: 213,
    amount2: 200,
    amount3: 208,
    currency: &#39;港元&#39;,
    ca: &#39;吴丹&#39;
  }];
  const totalRecord: any = {
    productName: &#39;合计&#39;,
    amount1: {},
    amount2: {},
    amount3: {}
  };
  records.forEach((record: any) => {
    const currency: string = record.currency;
    [&#39;amount1&#39;, &#39;amount2&#39;, &#39;amount3&#39;].forEach((key: string) => {
      const value: any = totalRecord[key];
      if (!(currency in value)) value[currency] = 0;
      value[currency] += record[key];
    });
  });
  records.push(totalRecord);
  const columns: any[] = [{
    dataKey: &#39;productName&#39;,
    title: &#39;产品名称&#39;,
    width: 90,
    fixed: true
  }, {
    dataKey: &#39;amount1&#39;,
    title: <React.Fragment>上周缴款金额<br/>（万）</React.Fragment>,
    width: 140,
    align: &#39;center&#39;,
    className: &#39;amount&#39;,
    render: calculateTotal
  }, {
    dataKey: &#39;amount2&#39;,
    title: <React.Fragment>上周预约金额<br/>（万）</React.Fragment>,
    width: 140,
    align: &#39;center&#39;,
    className: &#39;amount&#39;,
    render: calculateTotal
  }, {
    dataKey: &#39;amount3&#39;,
    title: <React.Fragment>待本周跟进金额<br/>（万）</React.Fragment>,
    width: 140,
    align: &#39;center&#39;,
    className: &#39;amount&#39;,
    render: calculateTotal
  }, {
    dataKey: &#39;currency&#39;,
    title: &#39;币种&#39;,
    width: 80
  }, {
    dataKey: &#39;ca&#39;,
    title: &#39;CA&#39;,
    width: 80
  }];
  return (
    <StoreProvider>
      <Page
        {...props}
        title="销售统计"
        className="test"
      >
        <div style={{padding: 15}}>
          <ScrollableTable
            width={window.innerWidth - 30}
            height={196}
            columns={columns}
            dataSource={records}
          />
        </div>
      </Page>
    </StoreProvider>
  );
};
function calculateTotal(value: any) {
  if (value instanceof Object) {
    const keys: any[] = Object.keys(value);
    return (
      <React.Fragment>
        {
          keys.map((key: string, index: number) => (
            <span key={index}>
              {`${value[key].toFixed(2)}万${key}`}
            </span>
          ))
        }
      </React.Fragment>
    )
  }
  return value.toFixed(2);
}
export default Test;

views/Test/index.less

.st-table-container {
  .st-table-body {
    td.st-table-cell.amount {
      padding-right: 20px !important;
      text-align: right !important;
      span {
        display: block;
      }
    }
  }
}

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