Function binding in reactjs

functionBinding.txt

In react js you can sent send data by props parent to child , 
aslo you can controll  parent function from child one

this is in parent-
saveHandler = () => {

}

 <VehicleCreateExtraInfoForm
    saveHandler={this.saveHandler}
  />
  
  
form child - 

<form
  onSubmit={this.saveHandler}
  className="sub-form"
  method="post"
>
  <input type="submit" value="Save" />

</form>