React onClick event

Question

I'm missing something. Here's a very simple hello world, the goal is to just fire an alert event onClick. The event does fire when the page loads, but not when I click the button. I appreciate the help. Here's a jsFiddle to make it easier to see: jsFiddle

var Hello = React.createClass({
render: function() {
    return <button onClick={alert("Hello World!")}>
               Click Me
            </button>;
}
React.render(<Hello />, document.getElementById('container'));

Answer 1

I think you're going about this wrong, because ReactJS is just JavaScript I don't think your way of firing this event will work. Your onClick should fire a function attached to your React element like so.

var Hello = React.createClass({
    myClick: function () {
        alert("Hello World!");
    },
    render: function() {
        return <button onClick={this.myClick}>
                   Click Me
                </button>;
    }
});

React.render(<Hello />, document.getElementById('container'));

Answer 2

Note: this is another way to do it if you want something quick/inline:

<button onClick={()=>{ alert('alert'); }}>alert</button>