Partial Checkout6

partial_checkout6.js

handleValid = () => {
		const { activeStep, validation } = this.state;
		if (activeStep === 0 && !validation.hasErrorAddressForm) {
			return false;
		} else if (activeStep === 2) {
			return false;
		}
		return true;
	}
//...
...//
	//The Next/Place Order button
	<Button
	variant="contained"
	color="primary"
	onClick={this.handleNext}
	className={classes.button}
	disabled={this.handleValid()}
	>
	{activeStep === steps.length - 1 ? 'Place order' : 'Next'}
	</Button>