React.js how to pass callbacks to child components?

Question

I would like to pass a callback to a doubly nested component, and while I am able to pass the properties effectively, I can't figure out how to bind the callback to the correct component so that it's triggered. My structure looks like this:

-OutermostComponent     -FirstNestedComponent         -SecondNestedComponent             -DynamicallyGeneratedListItems 

The List Items when clicked should trigger a callback which is the OutermostComponents method "onUserInput", but instead I get "Uncaught Error: Undefined is not a function". I suspect the problem is in how I am rendering the SecondNestedComponent inside the first, and passing it the callback. The code looks something like this:

var OutermostComponent = React.createClass({     onUserInput: //my function,     render: function() {         return (             <div>             //other components                  <FirstNestedComponent                     onUserInput={this.onUserInput}                 />             </div>         );     } });  var FirstNestedComponent = React.createClass({     render: function() {         return (             <div>             //other components                  <SecondNestedComponent                     onUserInput={this.onUserInput}                 />             </div>         );     } }); var SecondNestedComponent = React.createClass({     render: function() {         var items = [];         this.props.someprop.forEach(function(myprop) {             items.push(<DynamicallyGeneratedListItems myprop={myprop} onUserInput={this.props.onUserInput}/>);}, this);         return (             <ul>                 {items}             </ul>         );     } }); 

How do I correctly bind callbacks to the appropriate nested components?

Answer 1

You are passing this.onUserInput as a property to FirstNestedComponent. Therefore, you should access it in FirstNestedComponent as this.props.onUserInput.

var FirstNestedComponent = React.createClass({     render: function() {         return (             <div>                 <SecondNestedComponent                     onUserInput={this.props.onUserInput}                 />             </div>         );     } });