Question

import React, { Component } from 'react';
let _ = require('lodash');

import {bindActionCreators} from "redux";
import {connect} from 'react-redux';

import {fetchedBeaconsEdit} from '../../actions/';
import {editBeacon} from '../../actions/index';

// TODO - come up with a decent name

class InfoRow extends Component {

    render() {
        return (

            <tr>
                <td>
              { this.props.beacon === "name" 
                || this.props.beacon === "major" 
                || this.props.beacon === "minor" 
                || this.props.beacon === "beaconType" ?
                  <span>{this.props.beacon}<span className="font-css top">*</span></span>:
                  <span>{this.props.beacon}</span>
              }

                </td>
                <td>

                { this.props.beacon !== "beaconType" && 
                  this.props.beacon !== "uuid" && 
                  this.props.beacon !== "status" && 
                  this.props.beacon !== "store"&&
                  this.props.beacon !== "group" ?
                <div>
                    <input type="text"
                       className="form-control"
                       defaultValue={this.props.beaconValue}
                       name={this.props.beaconValue}
                       onChange={(e) =>this.props.handleInputChangeProp(e.target.value)}
                    /></div>:

                    this.props.beacon === "uuid" && this.props.beacon === "status" && this.props.beacon=== "store"?
                  <span></span>:

                    this.props.beacon === "beaconType"?

                    <select defaultValue={this.props.beaconValue} name={this.props.beaconValue} className="form-control" onChange={(e) =>this.props.handleInputChangeProp(e.target.value)}>
                      
                      <option name="ibeacon">IBEACON</option>
                      <option name="eddystone">EDDYSTONE</option>
                    </select>:this.props.beaconValue

                    

                }



                </td>
            </tr>
        )
    }
}

class BeaconEdit extends Component {

  constructor(props){
    super(props);
    this.state = {
            
        };
    this.handleInputChange = this.handleInputChange.bind(this);
    this.handleClick = this.handleClick.bind(this);
  }

  handleInputChange(beacon, value) {

        this.setState({
            [beacon]: value
        });
    }

 handleClick = () =>{
       Object.keys(this.props.ebcn).map((key)=> {
        if (this.state[key] !== undefined) {
          this.props.editBeaconGroup[key]=this.state[key];
        }
            
       })
        this.props.handleSubmitProp(this.props.editBeaconGroup);
  }
 
    render() {

        const rows = [];
        let a = this.props.ebcn;

        

       Object.keys(this.props.ebcn).map((keyName, keyIndex) =>{

          if (keyName === "store" || keyName === "group") {
            return rows.push(<InfoRow beacon={keyName} beaconValue={a[keyName].name.toString()} name={this.state[keyName]} key={keyIndex} handleInputChangeProp={(inp) =>this.handleInputChange(keyName, inp)}/>);
          }else{
            return rows.push(<InfoRow beacon={keyName} beaconValue={a[keyName].toString()} name={this.state[keyName]} key={keyIndex} handleInputChangeProp={(inp) =>this.handleInputChange(keyName, inp)}/>);
       }
       });

        return (


            <div className="col-md-6">
                <div className="">

                  <table className="table table-clear">
                    <tbody>
              
                    {rows}
                    
                    </tbody>
                  </table>
                 </div>
                 <div className="px-1" >
                        <button className="btn btn-sm btn-info btn-size btn-block" onClick={this.handleClick}>Save</button>
                 </div>
          </div>

        )

    }


}

class BeaconDetailEditComponent extends Component {
  
  constructor(props){
    super(props);
    this.state = {
        editbeacons: {}
        };
        this.handleSubmit = this.handleSubmit.bind(this);

        this.validateName = this.validateName.bind(this);
        this.validateMajor = this.validateMajor.bind(this);
        this.validateMinor = this.validateMinor.bind(this);
    }

    validateMinor = (minor) => {
      var re = /^[0-9]+$/;
      return re.test(minor);
    }

    validateMajor = (major) => {
      var re = /^[0-9]+$/;
      return re.test(major);
    }

    validateName = (name) => { 
      var re = /^[A-Za-z ]+$/;
      return re.test(name); 
    };


  handleSubmit (beaconedited) {

    console.log(beaconedited.name);

    if (!this.validateName(beaconedited.name)) { 
              alert('Name can not be an integer')  
          }

    else if (!this.validateMajor(beaconedited.major)) { 
              alert('Major number can only be an integer')  
          }

        else if (beaconedited.major.length > 5) {
          alert('Major number can not exceed 5 digits')
        }

        else if (!this.validateMinor(beaconedited.minor)) { 
              alert('Minor number can only be an integer')  
          }

        else if (beaconedited.major > 65535) {
          alert('Major number can not exceed the limit of 65535')
        }

        else if (beaconedited.minor > 65535) {
          alert('Minor number can not exceed the limit of 65535')
        }

    else {

      this.props.editBeacon(beaconedited, this.props.location.query.id);
    
  }
    }

  componentWillMount = () => {
        this.props.fetchedBeaconsEdit(this.props.location.query.id);  
    };

  
  render() {
    
    return (
        <div className="container px-3 mr-3">
            <div>
              <div className="col-md-6 col-md-offset-3"><h1>Edit Beacon Information</h1></div>
            </div>
            <br/>
            <br/>
                { this.props.ebcn != null?
            <div>
                <BeaconEdit ebcn={this.props.ebcn} handleSubmitProp={this.handleSubmit} editBeaconGroup={this.state.editbeacons}/>
            </div> :
                    <center><img className="gif-size" src={'img/avatars/default.gif'} alt="Loading"/></center>

            }
        </div>
    )
  }
}

function mapStateToProps(state) {
    return {
        eBeacon: state.eBeacon,
        ebcn: state.beacons
    }

}


function matchDispatchToProps(dispatch){
    return bindActionCreators({editBeacon: editBeacon, fetchedBeaconsEdit: fetchedBeaconsEdit}, dispatch);
}

export default connect(mapStateToProps, matchDispatchToProps)(BeaconDetailEditComponent);

我提供了代码段我在做什么我从服务器获取了值并显示在字段中，我将此页面设置为可编辑形式我想要做的是现在采取用户更改或更改的值，并在控制台中打印它们。我已经应用了handleInputChange并在更改时显示更改的值，但我想在按钮单击时在控制台中看到这些值怎么做？

Answer 1

首先，你改变国家的方式并不好。您正在将新状态设置为仅具有单个属性，该属性是已修改字段的名称和值。

如何打印您正在修改的字段的值，您应该在句柄更改方法中执行控制台日志。

那就是说，你的代码应该是这样的：

handleInputChange(event) {

    //const {name, value} = event.target;
    //const oldState = this.state;
    //const newState = Object.assign({},oldState,{[name]:value});
    //this.setState(newState);

    this.setState({
        [event.target.name]: event.target.value
    });

    //printing the input name and value as it is being modified.
    console.log(name + ":" + value);

    //if you want to see the value of the current state uncomment the line below
    //console.log("State=" + JSON.stringify(newState));

}

printState = () => {
  console.log("State="+JSON.stringify(this.state));
}

有关如何使用assign方法修改对象的更多信息，请参阅：MDN doc on Object.assign()

如果要在单击“保存”按钮时打印当前状态，请将onClick属性添加到按钮，如下面的代码所示：

<button value="Save" onClick={this.printState}/>

Answer 2

将InfoRow更改为

class InfoRow extends Component {

    render() {
        return (

            <tr>
                <td>
                  {this.props.beacon}
                </td>
                <td>
                <input type="text"
                   className="form-control"
                   defaultValue={this.props.beaconValue}
                   value={this.props.name}
                   name={this.props.beaconValue}
                   onChange={(e) =>this.props.handleInputChangeProp(e.target.value)}
                />
                </td>
            </tr>
        )
    }
}

并渲染到

Object.keys(this.props.ebcn).map((keyName, keyIndex) =>{

          return rows.push(<InfoRow beacon={keyName} beaconValue={a[keyName].toString()} name={this.state[keyName]} key={keyIndex} handleInputChangeProp={(inp) =>this.handleInputChange(keyName, inp)}/>);
       });

和

handleInputChange(beacon, value) {

        this.setState({
            [beacon]: value
        });
    }

和handleClick to

 handleClick = () =>{
       Object.keys(this.props.ebcn).map((key)=> {
            console.log(this.state[key]);
       }))
  }

可编辑的表格ReactJS

2 个答案: