OnChange event using React JS for drop down

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onchangeeventreactusing
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And on the component where select is used, define the function to handle onChange like below:,Developer Jobs Directory,Connect and share knowledge within a single location that is structured and easy to search.

You have to store the selected value as state and update the state when the value changes. Updating the state will trigger a rerender of the component.

var MySelect = React.createClass({
     getInitialState: function() {
         return {
             value: 'select'
         }
     },
     change: function(event){
         this.setState({value: event.target.value});
     },
     render: function(){
        return(
           <div>
               <select id="lang" onChange={this.change} value={this.state.value}>
                  <option value="select">Select</option>
                  <option value="Java">Java</option>
                  <option value="C++">C++</option>
               </select>
               <p></p>
               <p>{this.state.value}</p>
           </div>
        );
     }
});

React.render(<MySelect />, document.body);
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If you are new in react js then you want to see how to use select dropdown in react app. but it's very easy to use selectbox input in react js app. you can use it as you use in html and you have to write change event on it. using that change event you have to store value into form state. so you can get that data on submit.,React Textbox onChange Example | React Text Input Tutorial, handleChange(event) {

import React, { Component } from 'react';import { render } from 'react-dom';    class App extends Component {  constructor() {    super();    this.state = {      category: 'php'    };         this.handleChange = this.handleChange.bind(this);    this.handleSubmit = this.handleSubmit.bind(this);  }      handleChange(event) {    this.setState({category: event.target.value});  }      handleSubmit(event) {    console.log(this.state);    event.preventDefault();  }      render() {    return (      <div>        <h1>React Select Dropdown onChange Example - ItSolutionStuff.com</h1>        <form onSubmit={this.handleSubmit}>                    <strong>Select Category:</strong>          <select value={this.state.category} onChange={this.handleChange}>            <option value="php">PHP</option>            <option value="laravel">Laravel</option>            <option value="angular">Angular</option>            <option value="react">React</option>            <option value="vue">Vue</option>          </select>            <input type="submit" value="Submit" />        </form>      </div>    );  }}  render(<App />, document.getElementById('root'));
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Just like the onChange event watches for changes in an input field, the onSelect event occurs after some value is selected in an element. A dropdown list can be drawn closer to a regular input field since, under the shell, they both aim to get some value from the user. To listen to those selected values when the user dynamically changes them, the onSelect event comes in handy. ,After the onSelect event has been set to watch for a selection of value, the next step is to store that dynamic data somewhere. To do so, an event handler or a simple JavaScript function is invoked every time the event is triggered, and the data is extracted using the event object. In this case, it becomes even simpler using props. ,Next, attach a handleSelect function that fires when the onSelect function is triggered. Place this event as a prop inside the DropdownButton component and create a handleSelect function, which takes in the event object and logs it to the console.

1n px create - react - app react - bootstrap - dropdown
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The onChange event does not work. , JavaScript Questions , JavaScript Questions

var MySelect = React.createClass({
     change: function(){
         return document.querySelector('#lang').value;
     },
     render: function(){
        return(
           <div>
               <select id="lang">
                  <option value="select" onChange={this.change}>Select</option>
                  <option value="Java" onChange={this.change}>Java</option>
                  <option value="C++" onChange={this.change}>C++</option>
               </select>
               <p></p>
               <p value={this.change}></p>
           </div>
        );
     }
});

React.render(<MySelect />, document.body);
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75%

To render the selected value, use the value property of the DropDownList. If you set the value through the value property, hook up to the onChange event and manually update the value of the value property.,To bind the DropDownList to data, use the data property of the component.,The DropDownList enables you to configure the predefined list of options by setting its data property and the selected value by setting its value property.

Pretag
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Pretag
 Pretag team - issue, fix, solve, resolve
22%

In HTML, <select> creates a drop-down list. For example, this HTML creates a drop-down list of flavors:,This form has the default HTML form behavior of browsing to a new page when the user submits the form. If you want this behavior in React, it just works. But in most cases, it’s convenient to have a JavaScript function that handles the submission of the form and has access to the data that the user entered into the form. The standard way to achieve this is with a technique called “controlled components”.,When you need to handle multiple controlled input elements, you can add a name attribute to each element and let the handler function choose what to do based on the value of event.target.name.

<form>
   <label>
      Name:
      <input type="text" name="name" />
   </label>
   <input type="submit" value="Submit" />
</form>
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