There are two ways to handle this, and which you choose depends on which component should own the data and the loading state.
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Move the Ajax request into the parent and conditionally render the component:
var Parent = React.createClass({ getInitialState: function() { return { data: null }; }, componentDidMount: function() { $.get('http://foobar.io/api/v1/listings/categories/').done(function(data) { this.setState({data: data}); }.bind(this)); }, render: function() { if (this.state.data) { return <CategoriesSetup data={this.state.data} />; } return <div>Loading...</div>; } });
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Keep the Ajax request in the component and render something else conditionally while it’s loading:
var CategoriesSetup = React.createClass({ getInitialState: function() { return { data: null }; }, componentDidMount: function() { $.get('http://foobar.io/api/v1/listings/categories/').done(function(data) { this.setState({data: data}); }.bind(this)); }, render: function() { if (this.state.data) { return <Input type="select">{this.state.data.map(this.renderRow)}</Input>; } return <div>Loading...</div>; }, renderRow: function(row) { return <OptionRow obj={row} />; } });