React form onChange->setState one step behind

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A call to setState isn’t synchronous. It creates a “pending state transition.” (See here for more details). You should explicitly pass the new input value as part of the event being raised (like to handleSubmit in your example).

See this example.

handleSubmit: function(txt) {
    this.props.onChange(txt);
},
handleChange: function(e) {
    var value = e.target.value;
    this.setState({message: value});
    this.handleSubmit(value);
},

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