CODEWITHSUNDEEP
javascriptradio-buttonreactjs
andersem
andersem

Reputation: 724

How do I use radio buttons in React?

I'm making a form, and I was in need of a radio input. How do I get the checked radio input in a onSubmit-function, what is the correct way?

This is my code, I myRadioInput-variable to contain either Option A or Option B when I submit:

React.createClass({
    handleSubmit: function() {
        e.preventDefault();
        var myTextInput = this.refs.myTextInput.getDOMNode().value.trim();
        var myRadioInput = "How ?";
    },
    render: function() {
        return (
            <form onSubmit={this.handleSubmit}>
                <input type="text" ref="myTextInput" />
                <label>
                    <span>Option A</span>
                    <input type="radio" name="myRadioInput" value="Option A"/>
                </label>
                <label>
                    <span>Option B</span>
                    <input type="radio" name="myRadioInput" value="Option B"/>
                </label>
                <input type="submit" value="Submit this"/>
            </form>
        )
    }
});

Upvotes: 13

Views: 26903

Answers (4)

Jayakar Pj
Jayakar Pj

Reputation: 1

    { items.map(item => 
    <span id="qn" key={item.qno}>{item.qno}</span>
    )}

    { items.map(item => 
    <span id="qd" key={item.qno}>{item.question}<br/>
    <br/>
  <input onClick={this.captureClick} type="radio" value="1" checked={this.state.option === "1"}
        onChange={this.handleChange}/>
    { item.options.map(option => 
    <span id="op" key={option.option1}>
    {option.option1}</span>
    )}<br/>
   <br/> <input onClick={this.captureClick} type="radio" value="2" checked={this.state.option === "2"}
        onChange={this.handleChange} />
    { item.options.map(option => 
    <span id="op" key={option.option2}>
    {option.option2}</span>
    )}<br/><br/>
    <input onClick={this.captureClick} type="radio" value="3" checked={this.state.option === "3"}
        onChange={this.handleChange} />
    { item.options.map(option => 
    <span id="op" key={option.option3}>
    {option.option3}</span>
    )}<br/><br/>

    <input onClick={this.captureClick} type="radio" value="4" checked={this.state.option === "4"}
        onChange={this.handleChange} />

    { item.options.map(option => 
    <span id="op" key={option.option4}>{option.option4}</span>
    )}<br/><br/>
  <button type="submit" className="save" onClick={this.onSave}>SAVE</button>  
  
    </span>

You can use Radio button's like this also

Upvotes: 0

Mohmmad Ebrahimi Aval
Mohmmad Ebrahimi Aval

Reputation: 482

i use this solution for radio button two way binding with active :

inside render() method:

const items = [
    {label: 'one', checked: false},
    {label: 'two', checked: true},
    {label: 'three', checked: true}
];

items.map((item, index) => (
    <div className={`radioItem (item.checked) ? 'active' : ''`}>
        <label>
            {item.label}
            <input type="radio"
                   name="address"
                   value={item.label}
                   onClick={(e)=>{
                       $('.radioItem').filter('.active').removeClass('active');
                       $(e.currentTarget).closest('.radioItem').addClass('active');
                   }}
                   ref={elm => $(elm).prop('checked', item.checked)}
            />
        </label>
    </div>
))

Upvotes: -2

Jonny Buchanan
Jonny Buchanan

Reputation: 62793

If you make sure all your form elements have name attributes, you can extract data from the form onSubmit using form.elements:

handleSubmit: function(e) {
  e.preventDefault()
  var form = e.target
  var myTextInput = form.elements.myTextInput.value
  var myRadioInput = form.elements.myRadioInput.value
  // ...
}

In modern browsers, form.elements.myRadioInput should be a RadioNodeList which has a .value corresponding to the selected value, but when that's not supported you will get a NodeList or HTMLCollection of nodes which must be iterated over to find the selected value.

I also have a reusable React component - <AutoForm> - which uses a generic implementation of data extraction from form.elements for you. I've used it in the snippet below:

<meta charset="UTF-8">
<script src="http://fb.me/react-0.13.1.js"></script>
<script src="http://fb.me/JSXTransformer-0.13.1.js"></script>
<script src="https://cdn.rawgit.com/insin/react-auto-form/master/dist/react-auto-form.js"></script>
<div id="app"></div>
<script type="text/jsx;harmony=true">void function() { "use strict";
 
var Example = React.createClass({
    getInitialState() {
        return {submittedData: null}
    },

    handleSubmit(e, submittedData) {
        e.preventDefault()
        this.setState({submittedData})
    },

    render() {
        return <div>
            <AutoForm onSubmit={this.handleSubmit}>
                <input type="text" name="myTextInput" />
                <label>
                    <span>Option A</span>
                    <input type="radio" name="myRadioInput" value="Option A"/>
                </label>
                <label>
                    <span>Option B</span>
                    <input type="radio" name="myRadioInput" value="Option B"/>
                </label>
                <input type="submit" value="Submit this"/>
            </AutoForm>
            {this.state.submittedData && <pre>
              {JSON.stringify(this.state.submittedData, null, 2)}
            </pre>}
        </div>
    }
});
 
React.render(<Example/>, document.getElementById('app'))
 
}()</script>

Upvotes: 12

Anders Ekdahl
Anders Ekdahl

Reputation: 22933

You shouldn't use refs to get access to DOM nodes and inspect their value. Instead you should link the inputs value to a property on the component state.

Here are some examples of how to do it: https://facebook.github.io/react/docs/two-way-binding-helpers.html

Upvotes: 8

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