我正在使用控制输入来创建一个带有响应的简单表单。在组件状态下,我在状态上有2个属性“ clientName”和“ license”。改变那些效果很好。但是有一个作为对象的“运输”属性。更改任何运输属性都会产生错误。例如,如果我更改“ address1”,则在handleShippingChange函数中设置状态后,就会收到错误消息:
警告:TextField正在将文本类型的受控输入更改为
不受控制。输入元素不应从受控切换为
不受控制(反之亦然)。决定使用受控还是
组件生命周期中不受控制的输入元素。
我怀疑这与我如何为这些TextField定义值以及如何为运送属性设置状态有关。我究竟做错了什么?我组件的代码如下:
import React, {Component} from 'react';
import TextField from 'material-ui/TextField';
import RaisedButton from 'material-ui/RaisedButton';
import 'whatwg-fetch';
class Clients extends Component {
constructor() {
super();
this.state = {
"clientName": "client name",
"shipping": {
"name": "name",
"address1": "address 1",
"address2": "address 2",
"city": "city",
"state": "state",
"zip": "zip",
"country": "country"
},
"license": "license"
};
this.handleChange = this.handleChange.bind(this);
this.handleShippingChange = this.handleShippingChange.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
};
handleChange(event) {
this.setState({
[event.target.name]: this.getFieldValue(event.target)
});
};
handleShippingChange(event) {
this.setState({
shipping: {
[event.target.name]: this.getFieldValue(event.target)
}
});
};
getFieldValue(target) {
return target.type === 'checkbox' ? target.checked : target.value;
};
handleSubmit = (event) => {
event.preventDefault();
// do some stuff
};
render() {
return <div>
<h1>
Clients Page
</h1>
<form onSubmit={this.handleSubmit}>
<TextField
hintText="Enter the client name"
floatingLabelText="Client Name"
value={this.state.clientName}
onChange={this.handleChange}
name="clientName"
/>
<h2>Shipping Info</h2>
<TextField
hintText=""
floatingLabelText="Name"
value={this.state.shipping.name}
onChange={this.handleShippingChange}
name="name"
/>
<br />
<TextField
hintText=""
floatingLabelText="Address Line 1"
value={this.state.shipping.address1}
onChange={this.handleShippingChange}
name="address1"
/>
<br />
<TextField
hintText=""
floatingLabelText="Address Line 2"
value={this.state.shipping.address2}
onChange={this.handleShippingChange}
name="address2"
/>
<br />
<TextField
hintText=""
floatingLabelText="City"
value={this.state.shipping.city}
onChange={this.handleShippingChange}
name="city"
/>
<br />
<TextField
hintText=""
floatingLabelText="State"
value={this.state.shipping.state}
onChange={this.handleShippingChange}
name="state"
/>
<br />
<TextField
hintText=""
floatingLabelText="Zip Code"
value={this.state.shipping.zip}
onChange={this.handleShippingChange}
name="zip"
/>
<br />
<TextField
hintText=""
floatingLabelText="Country"
value={this.state.shipping.country}
onChange={this.handleShippingChange}
name="country"
/>
<br />
<TextField
hintText=""
floatingLabelText="License"
value={this.state.license}
onChange={this.handleChange}
name="license"
/>
<br />
<RaisedButton label="OK" primary={true} type="submit" />
</form>
</div>
};
}
export default Clients;
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
最佳答案
受控/不受控制的输入表示<input>
字段是否具有值。
// This is a controlled input
<input value="foo"/>
// This is an uncontrolled input
<input value={null}/>
这个想法是您不想从受控输入更改为非受控输入。两种类型的输入行为不同,这可能导致错误和/或不一致。
最简单的解决方法是确保始终有一个默认值(在为空字段的情况下,默认值为空字符串
''
)。另外,请注意,如果您对某个值的类型有保证,则一致类型通常比可空类型更好。这有助于减少空检查(
if (val != null) { /* ...etc */ }
)造成的开销但是,如果您只想进行单行修复,则还可以在jsx中提供默认值inline:
<input value={value || ''}/>
关于reactjs - react 形式错误将文本类型的受控输入更改为不受控制,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/42606621/