react-mountif

Avoid the tedious writing of conditional rendering

Motivation

Very often while writing React code, you stumble upon the following pattern:

let hello;
if (this.state.show) {
    hello = <Hello />;
}

This is quite tedious to write and it is a very common situation.

To avoid the boredom and keep on having fun, you can use this package, which comes in two different flavors, depending on your bravery. ES6 classes and ES7 decorators are the new spicy ingredients you may wanna taste. Otherwise you can always fallback to an old fashioned createClass.

How it works

Your component is wrapped. The wrapper's render function checks if either

• this.props.mountIf is false
• this.props.unmountIf is true

In which case, the render method of the wrapper returns null and nothing is displayed. Otherwise it returns the wrapped component.

Examples

ES6 classes and ES7 decorators

import MountIf from 'react-mountif';
import React from 'react';

@MountIf
class HelloWorld extends React.Component {
    render() {
        return <div>Hello World</div>;
    }
}

class Example extends React.Component {
    constructor(props) {
        super(props);
        this.state = { show: false };
    }

    handleState = () => {
        this.setState({ show: !this.state.show });
    }

    render() {
        return (
            <div>
                <button onClick={this.handleState}>
                    Click to toggle a nice greeting
                </button>
                <HelloWorld mountIf={this.state.show} />
            </div>
        );
    }
}

ES6, no classes

import MountIf from 'react-mountif';
import React from 'react';

let HelloWorld = React.createClass({
    render() {
        return <div>Hello World</div>;
    }
});

HelloWorld = MountIf(HelloWorld);

const Example = React.createClass({
    getInitialState() {
        return { show: false };
    },

    handleState() {
        this.setState({ show: !this.state.show });
    },

    render() {
        return (
            <div>
                <button onClick={this.handleState}>
                    Click to toggle a nice greeting
                </button>
                <HelloWorld mountIf={this.state.show} />
            </div>
        );
    }
});

export default Example;