ReactJs Select add default value

Question

I want to store select default value if user not touch it in ReactJs. How is that possible?

<select onChange={this.valSelected.bind(this)}>
    {currencies.map(function(name, index){
        return <option value={name}>{name}</option>;
    })}
</select>

and

valSelected(event){
    this.setState({
        valSelected: event.target.value
    });
}

Answer 1

You can just add a value property to the select element, set by your state.

<select value={this.state.valSelected} onChange={this.valSelected.bind(this)}>
    {currencies.map(function(name, index){
        return <option value={name}>{name}</option>;
    })}
</select>

This is described here in the react docs: Doc Link

Then set a default state for the component, either in the constructor or with getInitialState: What is the difference between using constructor vs getInitialState in React / React Native?