How can I use an IIFE to open a modal when the user first opens the web page ?

I have a modal page popping up when the user clicks a button :

    `render() {
      return (
         <div>
             <section>
                 <button onClick={() => this.refs.simpleDialog.show()}>Open Modal</button>
             </section>
             <SkyLight hideOnOverlayClicked ref="simpleDialog" title="Test Modal">
                 Text that appears inside the modal page
                <Button onClick={() => this.refs.simpleDialog.hide()} >Got It</Button>
             </SkyLight>
        </div>
    )} `

My goal is to open the modal automatically when the user opens the page for the first time.
I don't want to open the modal page by clicking on a button Question:
Can I use an IIFE (An immediately-invoked function expression) in order to open the modal as soon as the user open the page ?
My approach was to set a boolean to true. Then open the modal if the value is set to true

marcio / react-skylight

How can I use an IIFE to open a modal when the user first opens the web page ? #54