React sends the old state to its parent

Question

When I submit the state of a child component to its parent component, React sends the old state to the parent component.

I want to send an updated state each time I click on a ListItem that works correctly and calls the handleItemClick function.

But when I call sendStateToParent. He walks past the old estate. Suppose I clicked on ITEM1, it sends an empty array []. Then I clicked on ITEM2, it sends an array [ITEM1].

Here I find the creation of a popup menu. which can also act as a single choice based on the details he receives.

import React from 'react';
import ListItemComponent from './ListItem.jsx';
import DropDownButtonComponent from './DropDownButton.jsx';
import DropDownStyle from '../../../../css/sass/drop-down.scss';

module.exports = React.createClass({
  handleClick: function () {
    this.setState({open: !this.state.open});
  },
  getInitialState: function () {
    return {
      open: false,
      //listItems: this.props.listItems,
      selectedItems:[],
      title: this.props.dropdownTitle
    }
  },
  handleItemClick: function (item) {
    var selectedItems = [];
    if(this.props.multiple == true){
      selectedItems = this.state.selectedItems;
      if(selectedItems.indexOf(item)==-1){
        selectedItems.push(item);
      }else{
        selectedItems.splice(selectedItems.indexOf(item),1)
      }
      this.setState({
        title: this.state.selectedItems.length+" selected",
        selectedItems: selectedItems
      });
    } else{
      selectedItems = [];
      selectedItems.push(item);
      this.setState({
        title: item,
        selectedItems: selectedItems,
        open: false
      });
    }
    this.sendStateToParent();
  },
  sendStateToParent: function(){
    this.props.ifListChanged(this);
  },
  handleTextChange: function (event) {
    var filteredItems = [];
    this.props.listItems.map(function(item){
      if(item.toLowerCase().search(event.target.value.toLowerCase()) != -1){
        filteredItems.push(item);
      }
    },this);
    this.setState({
      listItems: filteredItems
    });
  },
  clearSelected: function(){
    this.setState({
      title: this.props.dropdownTitle,
      selectedItems: [],
    });
  },
  render: function () {
    var index = 0;
    var list=[];
    if (this.state.listItems != undefined) {
      list = this.state.listItems.map(function (item) {
        return (
          <ListItemComponent
            key={index++}
            item={item}
            whenItemClicked={this.handleItemClick}
            className={this.state.selectedItems.indexOf(item) != -1 ? "active" : ""}
          />);
      }.bind(this));
    } else {
      list = this.props.listItems.map(function (item) {
        return (
          <ListItemComponent
            key={index++}
            item={item}
            whenItemClicked={this.handleItemClick}
            className={this.state.selectedItems.indexOf(item) != -1 ? "active" : ""}
          />);
      }.bind(this));
    }

    return <div className="btn-group bootstrap-select form-control">
      <DropDownButtonComponent
        whenClicked={this.handleClick}
        title={this.state.title}
      />
      <ul className={"dropdown-menu inner dropdown-menu " + (this.state.open ? "show" : "") }>
        {this.props.search? <li><input type="text" style={{margin:"auto", maxWidth:"96%"}} onChange={this.handleTextChange} placeholder="Search"/></li> :""}
        <li className="disabled"><a>Select from below list {this.props.multiple ? <i title="clear all" style={{fontSize:"15px"}} onClick={this.clearSelected} className="text-danger fa fa-ban pull-right"></i>: ""}</a></li>
        {list}
      </ul>
    </div>
  }
});

Thanks in advance

Answer 1

, selecteditems, , setState() . . :

setState() this.state, . this.state .

, , , , , .

1: .
, , setState(). :

() - , setState, .

, setState(). - :

this.setState(
  {
    title: item,
    selectedItems: selectedItems,
    open: false
  },
  this.sendStateToParent
);

2 (, ): . , . , - .
:

• selectedItems
• , selectedItems
• handleItemClick
• , selectedItems ()
• ,