如何在JSX中的setState中使用变量

Question

I would like to use a variable in the setState function in a JSX file for React.

How would I restructure this code:

var name = e.target.name;
if(name == "title"){
    this.setState({ title: e.target.value});
}
else if(name == "date"){
    this.setState({ date: e.target.value});
}
else if(name == "amount"){
    this.setState({ amount: e.target.value});
}

Into something like this (so I don't repeat myself)?

var name = e.target.name;
this.setState({ name: e.target.value});

The above syntax just sets the state of "name" and not the value of the "name" variable.

Answer 1

Easy:

var newState = {};
newState[e.target.name] = e.target.value;
this.setState(newState);

Answer 2

var update = {};
update[e.target.name] = e.target.value;
this.setState(update);

If you're using an ES6 transpliler that supports computed property names (like Babel ), you can do:

this.setState({[e.target.name]: e.target.value});