react-components/blur-input.js

React components used by Khan Academy

const React = require("react");

/* You know when you want to propagate input to a parent...
 * but then that parent does something with the input...
 * then changing the props of the input...
 * on every keystroke...
 * so if some input is invalid or incomplete...
 * the input gets reset or otherwise effed...
 *
 * This is the solution.
 *
 * Enough melodrama. Its an input that only sends changes
 * to its parent on blur.
 */
const BlurInput = React.createClass({displayName: "BlurInput",
    propTypes: {
        className: React.PropTypes.string,
        style: React.PropTypes.any,
        value: React.PropTypes.string.isRequired,
        onChange: React.PropTypes.func.isRequired,
    },
    getInitialState: function() {
        return {value: this.props.value};
    },
    componentWillReceiveProps: function(nextProps) {
        this.setState({value: nextProps.value});
    },
    handleChange: function(e) {
        this.setState({value: e.target.value});
    },
    handleBlur: function(e) {
        this.props.onChange(e.target.value);
    },
    render: function() {
        return React.createElement("input", {
            className: this.props.className, 
            style: this.props.style, 
            type: "text", 
            value: this.state.value, 
            onChange: this.handleChange, 
            onBlur: this.handleBlur}
        );
    },
});

module.exports = BlurInput;