React autoFocus sets cursor to beginning of input value

One solution:

<input
  type="text"
  autoFocus
  value={this.state.teamId}
  onChange={this.setTeamId}
  onFocus={function(e) {
    var val = e.target.value;
    e.target.value = '';
    e.target.value = val;
  }}
/>

https://jsfiddle.net/o3s05zz4/1/

Adaptation of this answer: https://stackoverflow.com/a/2345915/1589521

This actually works:

componentDidMount() {
    const input = this.input;
    const length = input.value.length;
    input.focus();
    input.setSelectionRange(length, length);
}

render() {
   return (
       <input ref={ref => this.input = ref} ... >
   )
}

PS. If you need to support IE8 and below you'll need to use IE-specific checks.

This way the text of the input will be selected, ready to edit

<input
  type="text"
  defaultValue="Untitled"
  autoFocus
  onFocus={e => e.currentTarget.select()}
/>