React.js:使用一个onChange处理程序识别不同的输入 [英] React.js: Identifying different inputs with one onChange handler
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问题描述
好奇正确的方法是:
var Hello = React.createClass({
getInitialState: function() {
return {total: 0, input1:0, input2:0};
},
render: function() {
return (
<div>{this.state.total}<br/>
<input type="text" value={this.state.input1} onChange={this.handleChange} />
<input type="text" value={this.state.input2} onChange={this.handleChange} />
</div>
);
},
handleChange: function(e){
this.setState({ ??? : e.target.value});
t = this.state.input1 + this.state.input2;
this.setState({total: t});
}
});
React.renderComponent(<Hello />, document.getElementById('content'));
显然你可以创建单独的handleChange函数来处理每个不同的输入,但这不是很好。类似地,你可以创建一个仅用于单个输入的组件,但我想看看是否有办法这样做。
Obviously you could create separate handleChange functions to handle each different input, but that's not very nice. Similarly you could create a component just for an individual input, but I wanted to see if there's a way to do it like this.
推荐答案
<我建议坚持使用标准的HTML属性,例如 名称
输入
用于标识输入的元素。此外,您不需要将total保持为州中的单独值,因为它可以通过在您的州中添加其他值来组合:
I suggest sticking to standard HTML attributes like name
on input
Elements to identify your inputs. Also, you don't need to keep "total" as a separate value in state because it is composable by adding other values in your state:
var Hello = React.createClass({
getInitialState: function() {
return {input1: 0, input2: 0};
},
render: function() {
const total = this.state.input1 + this.state.input2;
return (
<div>{total}<br/>
<input type="text" value={this.state.input1} name="input1" onChange={this.handleChange} />
<input type="text" value={this.state.input2} name="input2" onChange={this.handleChange} />
</div>
);
},
handleChange: function(e) {
this.setState({[e.target.name]: e.target.value});
}
});
React.renderComponent(<Hello />, document.getElementById('content'));
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