Question

我正在使用Material UI和React制作一个可排序的表组件。我想要实现的功能是

4行可排序表
当用户点击“加载更多”时，默认数据下方会显示另外4行。

目前，我在第一个之后添加了另一个renderRows()。它在表格中显示8行。但是数据按每个renderRows()排序。

图片1默认页面

图片2点击事件后

代码

// properties of TableHeader component
let headerProps = {
enableSelectAll: false,
displaySelectAll: false,
adjustForCheckbox: false
};

 // initial set of rows, simulating data from the database
 let rows = [
 {date: "12:30 12.9.2017", payment: "MasterCard", narrative: "restige 
Cosmetics, Total Intensity Eyeliner Long Lasting Intense Color, Deepest 
Black, 1.2 g (.04 oz)", amount: "$912.51", uniqueId: 0 },
{date: "11:30 12.9.2017", payment: "Visa", narrative: "Total Intensity 
Eyeliner Long Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)", 
amount: "$744.51", uniqueId: 1 },
{date: "13:30 12.9.2017", payment: "PayPal", narrative: "Eyeliner Long 
Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)", amount: "$12.51", 
uniqueId: 2 },
{date: "20:30 12.9.2017", payment: "MasterCard", narrative: "Long 
Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)", amount: "$16.51", 
uniqueId: 3 }
 ];

// our table hader information, key is the name of the 
// property to sort by when the header is clicked 
let headers = [
{name: "", key: "checkbox"},
{name: "Today", key: "date"},
{name: "Payment", key: "payment"},
{name: "Narrative", key: "narrative"},
{name: "Amount", key: "amount"}
 ];

 // our table component that can sort columns
 class SortableTable extends React.Component {

 constructor(props){
 super(props);
 this.state = {rows, 
              sortBy: 'firstName',
              tableOpen : false
            };
  }

 handleClick = (event) => {
 event.preventDefault();
 this.setState({
  tableOpen : !this.state.tableOpen
 })
}

renderHeaders(){
let header= headers.map( (h) => {
  return <SortableHeader 
            key={h.key}
            name={h.name}
            onClicked={()=>this.updateSortBy(h.key)} 
            isSortColumn={this.state.sortBy == h.key}/>
});
return <TableRow>{header}</TableRow>;
}

renderRows() {
return this.state.rows.map( (row, i) => <UserRow {...row} key=
{row.uniqueId}/> );
 }

updateSortBy(sortBy){
  // multiple clicks on the same column reverse the sort order
  if( sortBy == this.state.sortBy ){
    this.setState( {rows: [...this.state.rows.reverse()]} );
    return;
  }

  let rows = [...this.state.rows];
  rows.sort( (a,b) => {
    if (a[sortBy] < b[sortBy])
      return -1;
    if(a[sortBy] > b[sortBy])
      return 1;
    return 0;
  });

  this.setState({rows, sortBy});
}


 render() {
 return (
  <div>
    <MuiThemeProvider>
    <Table>
      <TableHeader {...headerProps}>
          {this.renderHeaders()}
      </TableHeader>
      <TableBody>
        {this.renderRows()}
        {!this.state.tableOpen ? this.renderRows() : "" }
      </TableBody>
    </Table>   
  </MuiThemeProvider>
  <p className="openTable" onClick={this.handleClick} >LOAD MORE</p>
  </div>
  );
 }
}



function SortableHeader(props){
let style = {
cursor: "pointer"
}
if(props.isSortColumn){
style.fontWeight = "bold";
style.color = "black";
}

return (
  <TableHeaderColumn>
  <div style={style} onClick={() => props.onClicked()}>{props.name}
  {props.name==""? "" :<img src={arrowUpDown} alt="arrowUpDown" 
  className="arrowUpDown"/>}</div>
  </TableHeaderColumn>
  );
 }


 function UserRow(props){
 return (
 <TableRow>
  <TableRowColumn><img src={Check} alt="Check" className="Check"/>
 </TableRowColumn>
  <TableRowColumn>{props.date}</TableRowColumn>
  <TableRowColumn>{props.payment=="Visa" ?  <img src={Visa} alt="Visa" 
  className="Visa"/> :  (props.payment=="PayPal" ?  <img src={Paypal} 
  alt="Paypal" className="Master"/> :  <img src={Master} alt="Master" 
  className="Master"/>)}


  {props.payment}</TableRowColumn>
   <TableRowColumn>{props.narrative}</TableRowColumn>
   <TableRowColumn>{props.amount}</TableRowColumn>
   </TableRow>
 );
 }

Answer 1

updateSortBy()方法只对this.state.rows中当前的内容进行排序，因此调用renderRows()两次只会将排序后的集合依次呈现。

您可能希望LOAD MORE click事件向状态添加更多行，这样sort和render方法就会对整个数据集起作用，而不是两个数据实例。

像这样......

// properties of TableHeader component
let headerProps = {
    enableSelectAll: false,
    displaySelectAll: false,
    adjustForCheckbox: false
};

// initial set of rows, simulating data from the database
let rows = [
    {
        date: "12:30 12.9.2017",
        payment: "MasterCard",
        narrative: "restige Cosmetics, Total Intensity Eyeliner Long Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)",
        amount: "$912.51",
        uniqueId: 0
    },
    {
        date: "11:30 12.9.2017",
        payment: "Visa",
        narrative: "Total Intensity Eyeliner Long Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)",
        amount: "$744.51",
        uniqueId: 1
    },
    {
        date: "13:30 12.9.2017",
        payment: "PayPal",
        narrative: "Eyeliner Long Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)",
        amount: "$12.51",
        uniqueId: 2
    },
    {
        date: "20:30 12.9.2017",
        payment: "MasterCard",
        narrative: "Long Lasting Intense Color, Deepest Black, 1.2 g (.04 oz)",
        amount: "$16.51",
        uniqueId: 3
    }
];

// our table hader information, key is the name of the 
// property to sort by when the header is clicked 
let headers = [
    { name: "", key: "checkbox" },
    { name: "Today", key: "date" },
    { name: "Payment", key: "payment" },
    { name: "Narrative", key: "narrative" },
    { name: "Amount", key: "amount" }
];

// our table component that can sort columns
class SortableTable extends React.Component {

    constructor(props) {
        super(props);
        this.state = {
            rows,
            sortBy: 'firstName',
            tableOpen: false
        };
    }

    handleClick = (event) => {
        event.preventDefault();

        // create a new array containing the old and new rows
        const newRows = [...this.state.rows, ...rows];

        this.setState({
            tableOpen: !this.state.tableOpen,
            rows: newRows // update the state with the new rows
        })
    }

    renderHeaders() {
        let header = headers.map((h) => {
            return <SortableHeader
                key={h.key}
                name={h.name}
                onClicked={() => this.updateSortBy(h.key)}
                isSortColumn={this.state.sortBy == h.key} />
        });
        return <TableRow>{header}</TableRow>;
    }

    renderRows() {
        return this.state.rows.map((row, i) =>
            <UserRow {...row} key={row.uniqueId} />
        );
    }

    updateSortBy(sortBy) {
        // multiple clicks on the same column reverse the sort order
        if (sortBy == this.state.sortBy) {
            this.setState({ rows: [...this.state.rows.reverse()] });
            return;
        }

        let rows = [...this.state.rows];
        rows.sort((a, b) => {
            if (a[sortBy] < b[sortBy])
                return -1;
            if (a[sortBy] > b[sortBy])
                return 1;
            return 0;
        });

        this.setState({ rows, sortBy });
    }


    render() {
        return (
            <div>
                <MuiThemeProvider>
                    <Table>
                        <TableHeader {...headerProps}>
                            {this.renderHeaders()}
                        </TableHeader>
                        <TableBody>
                            {this.renderRows()}
                            {/*no need to call this.renderRows() twice*/}
                            {/*{!this.state.tableOpen ? this.renderRows() : ""}*/}
                        </TableBody>
                    </Table>
                </MuiThemeProvider>
                <p className="openTable" onClick={this.handleClick} >LOAD MORE</p>
            </div>
        );
    }
}



function SortableHeader(props) {
    let style = {
        cursor: "pointer"
    }
    if (props.isSortColumn) {
        style.fontWeight = "bold";
        style.color = "black";
    }

    return (
        <TableHeaderColumn>
            <div style={style} onClick={() => props.onClicked()}>{props.name}
                {props.name == "" ? "" : <img src={arrowUpDown} alt="arrowUpDown"
                    className="arrowUpDown" />}</div>
        </TableHeaderColumn>
    );
}


function UserRow(props) {
    return (
        <TableRow>
            <TableRowColumn><img src={Check} alt="Check" className="Check" />
            </TableRowColumn>
            <TableRowColumn>{props.date}</TableRowColumn>
            <TableRowColumn>
                {
                    props.payment == "Visa" ?
                        <img src={Visa} alt="Visa" className="Visa" /> :
                        (
                            props.payment == "PayPal" ?
                                <img src={Paypal} alt="Paypal" className="Master" /> :
                                <img src={Master} alt="Master" className="Master" />
                        )
                }

                {props.payment}
            </TableRowColumn>
            <TableRowColumn>{props.narrative}</TableRowColumn>
            <TableRowColumn>{props.amount}</TableRowColumn>
        </TableRow>
    );
}

在可排序表材料UI表和React中单击事件后加载更多行

1 个答案: