Warning: A component is changing an uncontrolled input of type text to be controlled. Input elements should not switch from uncontrolled to controlled (or vice versa). Decide between using a controlled or uncontrolled input element for the lifetime of the component.*
Following is my code:
constructor(props) {
super(props);
this.state = {
fields: {},
errors: {}
}
this.onSubmit = this.onSubmit.bind(this);
}
....
onChange(field, e){
let fields = this.state.fields;
fields[field] = e.target.value;
this.setState({fields});
}
....
render() {
return(
<div className="form-group">
<input
value={this.state.fields["name"]}
onChange={this.onChange.bind(this, "name")}
className="form-control"
type="text"
refs="name"
placeholder="Name *"
/>
<span style={{color: "red"}}>{this.state.errors["name"]}</span>
</div>
)
}
The reason is, in state you defined:
this.state = { fields: {} }
fields as a blank object, so during the first rendering this.state.fields.name will be undefined, and the input field will get its value as:
value={undefined}
Because of that, the input field will become uncontrolled.
Once you enter any value in input, fields in state gets changed to:
this.state = { fields: {name: 'xyz'} }
And at that time the input field gets converted into a controlled component; that's why you are getting the error:
A component is changing an uncontrolled input of type text to be controlled.
Possible Solutions:
1- Define the fields in state as:
this.state = { fields: {name: ''} }
2- Or define the value property by using Short-circuit evaluation like this:
value={this.state.fields.name || ''} // (undefined || '') = ''
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