How to disable button onclick in reactjs

I had a condition if the two textfield are the same it will proceed if not then the button is disable I know im doing this wrong but this is what i wanted to do please help

onSubmit() {
        debugger
        if  (this.state.password == this.state.password2)
            alert('same');
        else 
            alert('error');
            this.disable;
}