Javascript 如何在 React 中使用单选按钮？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/29694078/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I use radio buttons in React?
提问by andersem
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?
我正在制作一个表格，我需要一个无线电输入。如何在 onSubmit 函数中获得选中的单选输入，正确的方法是什么？
This is my code, I myRadioInput-variable to contain either Option A or Option B when I submit:
这是我的代码，当我提交时，我的 myRadioInput 变量包含选项 A 或选项 B：
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>
)
}
});
采纳答案by Anders Ekdahl
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.
您不应该使用 refs 来访问 DOM 节点并检查它们的值。相反，您应该将输入值链接到组件状态的属性。
Here are some examples of how to do it: https://facebook.github.io/react/docs/two-way-binding-helpers.html
以下是一些操作示例：https: //facebook.github.io/react/docs/two-way-binding-helpers.html
回答by Jonny Buchanan
If you make sure all your form elements have nameattributes, you can extract data from the form onSubmitusing form.elements:
如果您确保所有表单元素都具有name属性，则可以onSubmit使用form.elements以下命令从表单中提取数据：
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.myRadioInputshould be a RadioNodeListwhich has a .valuecorresponding to the selected value, but when that's not supported you will get a NodeListor HTMLCollectionof nodes which must be iterated over to find the selected value.
在现代浏览器中，form.elements.myRadioInput应该是 a RadioNodeList，它具有.value与所选值对应的a ，但是当不支持时，您将获得 aNodeList或HTMLCollectionof 节点，必须对其进行迭代才能找到所选值。
I also have a reusable React component - <AutoForm>- which uses a generic implementation of data extraction from form.elementsfor you. I've used it in the snippet below:
我还有一个可重用的 React 组件 -<AutoForm>它form.elements为您使用了数据提取的通用实现。我在下面的代码片段中使用了它：
<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>回答by Jayakar Pj
{ 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
您也可以像这样使用单选按钮
回答by Mohmmad Ebrahimi Aval
i use this solution for radio button two way binding with active :
我将此解决方案用于单选按钮与 active 的双向绑定：
inside render() method:
在 render() 方法中：
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>
))
