React, how to access DOM element in render function from same component

g：

I would like to know what is the best practice for accessing DOM elements inside a render function from the same component. Note that I will render this component multiple times on the page.

E.g

var TodoItem = React.createClass({
    ...
    render:function(){

        function oneSecLater(){
            setTimeout(function(){
            //select the current className? this doesn't work, but it gives you an idea what I want.
            document.getElementsByClassName('name').style.backgroundColor = "red";
                )}, 1000);
        }

        return(
            <div className='name'>{this.oneSecLater}</div>
        )



})
Saba Hassan:

Here, no need to use setTimeout. There are some component lifecycle methods, which componentDidMountare called after rendering. So you can get a reference to the div in that method.

var TodoItem = React.createClass({
  ...
  componentDidMount: function () {
     if(this.myDiv) {
        this.myDiv.style.backgroundColor = "red";
     }
  }
  render:function(){
    return(
        <div className='name' ref = {c => this.myDiv = c}></div>
    );
});

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