How to passing the parameter to event handle in reactjs

Question

I have created a component

import React, { Component } from 'react'
import AppStep from '../common/AppStep'
import { ButtonDropdown, DropdownToggle, DropdownMenu, DropdownItem } from 'reactstrap';

class Step2 extends Component {
    constructor(props) {
        super(props);
        this.togglePhoto = this.togglePhoto.bind(this);
        this.selectPhoto = this.selectPhoto.bind(this);

        this.toggleDoc = this.toggleDoc.bind(this);
        this.selectDoc = this.selectDoc.bind(this);


        this.state = {
          dropdownOpenDoc: false,
          dropdownOpenPhoto: false,
          valueDoc : "រូបថត",
          valuePhoto : "រូបថត"
        };


      }



    toggleDoc(event) {
        console.log(event.target.innerText)
        this.setState({
          dropdownOpenDoc: !this.state.dropdownOpenDoc
        });
      }
      selectDoc(event) {
          //console.log(event.target.innerText)
        this.setState({
          dropdownOpenDoc: !this.state.dropdownOpenDoc,
          valueDoc: event.target.innerText
        });

    }
    togglePhoto(event) {
        console.log(event.target.innerText)
        this.setState({
            dropdownOpenPhoto: !this.state.dropdownOpenPhoto
        });
      }
    selectPhoto(event) {
        //console.log(event.target.innerText)
      this.setState({
        dropdownOpenPhoto: !this.state.dropdownOpenDocPhoto,
        valuePhoto: event.target.innerText
      });

  }
    renderForm() {
        return (

            <form className="needs-validation"  name="loan-info" noValidate method="POST" action="/">
              <hr className="mb-4"/>

              <div className="row">
                  <div className="col-md-6 mb-3">            
                    <div className="btn-group">

                        <ButtonDropdown isOpen={this.state.dropdownOpenPhoto} toggle={this.togglePhoto}>
                                <DropdownToggle caret>{this.state.valuePhoto}</DropdownToggle>
                                <DropdownMenu>
                                        <DropdownItem onClick={this.selectPhoto}>ថតថ្មីពីកាមេរា</DropdownItem>
                                        <DropdownItem onClick={this.selectPhoto}>ដាក់រូបដែលមានស្រាប់</DropdownItem>
                                </DropdownMenu>
                        </ButtonDropdown>

                    </div>
                    <div id="photo-placholder">
                        <img className="img-placeholder-photo"  src="holder.js/312x225"/>

                        <div className="custom-camera" id="camera-photo">
                          <img className="img-placeholder" src="img/kanel.png"/>
                        </div>

                        <div className="custom-file" id="upload-photo" >
                          <input type="file" className="custom-file-input" id="photo-input-file" aria-describedby="fileHelp" required />
                          <label className="custom-file-label" htmlFor="photo-input-file">
                              ជ្រើសរូបថតអ្នក
                          </label>
                          <div className="invalid-feedback">
                              អ្នកចាំបាច់បំពេញ ជ្រើសរូបថត
                          </div>
                        </div>

                    </div>
                  </div>

                  <div className="col-md-6 mb-3">            
                    <div className="btn-group">
                    {/* Render another dropdown list */}

                    <ButtonDropdown isOpen={this.state.dropdownOpenDoc} toggle={this.toggleDoc}>
                                <DropdownToggle caret>{this.state.valueDoc}</DropdownToggle>
                                <DropdownMenu>
                                        <DropdownItem onClick={this.selectDoc}>ថតថ្មីពីកាមេរា</DropdownItem>
                                        <DropdownItem onClick={this.selectDoc}>ដាក់រូបដែលមានស្រាប់</DropdownItem>
                                </DropdownMenu>
                        </ButtonDropdown>

                    </div>

I want to add more dropdown list which has difference display,I don't want to copy the same functions , anyone could guide how can just pass the params and handle its output.

Thanks

To be clear, you want to pass additional parameters into your toggle method? — Tyler
– Tyler, Commented May 17, 2018 at 5:03
when I need to add a new dropdown list , my current approach is duplicate function toggle and select for example toggle1, select1 or toggle2, select2 — tree em
– tree em, Commented May 17, 2018 at 5:41
oh, so the dropdown is causing an event; but, there can multiple dropdowns that can send the event. So you want to be able to figure out which dropdown sent the event right? — Tyler
– Tyler, Commented May 17, 2018 at 5:45
@Tyler , I have updated my trying snippet code, please kindly check. — tree em
– tree em, Commented May 17, 2018 at 7:21

Tyler · Accepted Answer · 2018-05-17 07:31:43Z

1

Assuming I am correct at this comment, I believe you can solve your problem with event.currentTarget. This is a vanilla javascript thing, here is the documentation.

Essentially, event.currentTarget always refers to the exact element that raised the event. So it will always refer to the specific dropdownlist that raised your toggle event.

Note, do NOT confuse event.target with event.currentTarget. event.target has varying results; because, the element it can refer to can change due to things like event bubbling.

edited May 17, 2018 at 7:31

answered May 17, 2018 at 6:05

Tyler

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2 Comments

tree em Over a year ago

anyways to simplify the code, by for example toggle(param, event) , select(param, event) and I can pass it through each dropdown element.

Tyler Over a year ago

@kn3l I'm not following what you are saying. Could describe what is the extra param you are trying to pass in and where it is coming from?

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