RenderCount(shouldComponentUpdate)

by kazu69

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/JSXTransformer.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.13.1/react-with-addons.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>

JavaScript 1.7

var Hello = React.createClass({
    renderCount: 0,
    getInitialState: function() {
        return {value: 0};
    },
    shouldComponentUpdate: function(nextProp, nextState) {
       return false;
    },
    countUp: function() {
        this.setState({value : this.state.value + 1});
    },
    render: function() {
        // count how many times 'render' was called
        this.renderCount += 1;
        return (
            <div>
            <div>Count: {this.state.value}</div>
            <div>Render: {this.renderCount}</div>
            <button onClick={this.countUp}>Count Up</button>
            </div>
        );
    }
});
 
React.render(<Hello />, document.body);