Introduction to two functions for processing arrays in js (filter() function and indexOf() function)-JS Tutorial-php.cn

Introduction to two functions for processing arrays in js (filter() function and indexOf() function)

不言

Release： 2018-08-22 17:26:31

Original

2333 people have browsed it

This article brings you an introduction to two functions for processing arrays in js (filter() function and indexOf() function). It has certain reference value. Friends in need can refer to it. Hope it helps.

1. Deduplication and filtering.

/*
   * @interface Grid  1.行更新
   * */
  handleGridRowsUpdated = ({fromRow, toRow, updated })=> {
    console.log(&#39;1.handleGridRowsUpdated&#39;,arguments)
    let rows = this.state.rows;

    for (let i = fromRow; i <= toRow; i++) {
      let rowToUpdate = rows[i];
      let updatedRow = React.addons.update(rowToUpdate, {$merge: updated});
      rows[i] = updatedRow;
    }

    this.setState({ rows });
  };

  /*
   * @interface 2.选中行接口
   * @param {Array} 选中的行
   * */
  onRowsSelected = (rows ) =>{ /*新增选择的行*/
    //进行复选。
    this.setState( {
      selectedIds: this.state.selectedIds.concat( rows.map(r => r.row[this.props.rowKey])),
    });
    this.setState({
      selectedRows: this.state.selectedRows.concat( rows.map(r => r.row)),
    });
    //进行单选
     /* this.setState({
      selectedIds: rows.map(r => r.row[this.props.rowKey]),
    });
    this.setState({
      selectedRows: rows.map(r => r.row),
    });*/

  };

  /*
   * @interface 3.取消选中行接口
   * @param {Array} 取消选中的行
   * */
  onRowsDeselected = (rows /*取消选择的行*/) =>{
    let rowIds = rows.map(r =>  r.row[this.props.rowKey]);
    this.setState({
      selectedIds: this.state.selectedIds.filter(i => rowIds.indexOf(i) === -1 ), //
    });
    this.setState({
      selectedRows: this.state.selectedRows.filter(r => rowIds.indexOf(r[this.props.rowKey]) === -1 )
    });
  };


  /**
   * @interface 4.行选中接口
   * */
  onRowClick = (rowIdx, clickedRow)=>{
    //console.log(&#39;选中行&#39;, rowIdx,&#39;_行数据 &#39;, clickedRow);
    // case1. 如果是全选操作，跳过会自动调用onRowsSelected方法，如果是单选操作请隐藏全选checkbox视图操作
    if(rowIdx === -1){
      return;
    }
    // case2. 不是全选操作
    const hasSelected =  this.state.selectedRows.some((item)=>{
      return item[this.props.rowKey] === clickedRow[this.props.rowKey]
    });

    if(hasSelected){
      let rowIds = clickedRow[this.props.rowKey];
      //console.log(&#39;选中rowIds&#39;, rowIds );

      this.setState({
        selectedIds: this.state.selectedIds.filter(i => rowIds.toString().indexOf(i) === -1 )
      });
      this.setState({
        selectedRows: this.state.selectedRows.filter(r => rowIds.toString().indexOf(r[this.props.rowKey]) === -1 )
      });
    }else{
      // case2-case1. 采用赋值，如果是只能选中一行采用赋值，如果是合并选中行，采用concat方法来合并操作
      this.setState({selectedIds: [clickedRow[this.props.rowKey]]});
      this.setState({selectedRows: [clickedRow]});
    }
  };

Copy after login

2. Traverse the array.

{
  title: &#39;类型&#39;,
  dataIndex: &#39;type&#39;,
  key: &#39;type&#39;,
  width: 80,
  sortable: false,
  render: (value, record, i)=>{
    //类型模块
    let _arr =[], text=&#39;&#39;;
    _arr = searchTextByValues(&#39;doctor_advice_type&#39;);//模块名称---匹配字典表。
    if(_arr.length > 0) {
      _arr.map((item)=> {
        if (value === item.value) {
          text = item.text;
          return
        }
      })
    }
    return (
      <span>{text}</span>
    )
  }
},

Copy after login

<====================== ViewLabProjectModal =================== =======================>

/** 2.2 字典表的模块类型  **/
matchDictionaryList = (type, value)=>{
  let moduleType = searchTextByValues(type);  return (
    moduleType instanceof Array ?
      moduleType.map((item)=>{
        if(item.value === value) { //匹配
          return  item.text;
        }
      })
     : &#39;&#39;  )}

Copy after login

Use:

<td><p className={`${inlineTrCls}`}>{ this.matchDictionaryList(&#39;project_detail_type&#39;, k.type)}</p></td>
<td><p className={`${inlineTrCls}`}>{k.ageMin}- {k.ageMax}</p> </td>
<td><p className={`${inlineTrCls}`}>{ this.matchDictionaryList(&#39;sex&#39;, k.sex)}</p></td>
<td><p className={`${inlineTrCls}`}>{k.minValue}-{k.maxValue}</p></td>

Copy after login

Related recommendations:

JS array (Array) processing function sorting_basic knowledge

How js gets the array and processes the php array

The above is the detailed content of Introduction to two functions for processing arrays in js (filter() function and indexOf() function). For more information, please follow other related articles on the PHP Chinese website!