如何在material-ui的导航栏中设置onClick？

Question

Below is the code for creating the navigation bar/header for an application. I have used material-ui.

import React, { Component } from "react";
import PropTypes from "prop-types";
import { withStyles } from "@material-ui/styles";
import AppBar from "@material-ui/core/AppBar";
import Toolbar from "@material-ui/core/Toolbar";
import Typography from "@material-ui/core/Typography";
import IconButton from "@material-ui/core/IconButton";
import MenuIcon from "@material-ui/icons/Menu";
import AccountCircle from "@material-ui/icons/AccountCircle";
import ShoppingCartOutlinedIcon from "@material-ui/icons/ShoppingCartOutlined";

const styles = (theme) => ({
  root: {
    width: "100%",
  },
  flex: {
    flex: 1,
  },
  menuButton: {
    marginLeft: -12,
    marginRight: 20,
  },
});

class Nav extends Component {
  render() {
    const { classes } = this.props;

    return (
      <AppBar position="static" elevation={0}>
        <Toolbar>
          <IconButton
            className={classes.menuButton}
            color="contrast"
            onClick={this.props.toggleDrawer}
          >
            <MenuIcon />
          </IconButton>
          <Typography className={classes.flex} type="title" color="inherit">
            Pizza Shop
          </Typography>
          <div>
            <IconButton color="contrast" onClick={this.props.cart}>
              <ShoppingCartOutlinedIcon />
            </IconButton>
            <IconButton color="contrast" onClick={this.props.login}>
              <AccountCircle />
            </IconButton>
          </div>
        </Toolbar>
      </AppBar>
    );
  }
}

Nav.propTypes = {
  classes: PropTypes.object.isRequired,
};

export default withStyles(styles)(Nav);

I'm new to 'props' and I'm not sure what this.props.cart or this.props.login will do. I want to create a functionality where when I click on the above two icons, I'm directed to some another component, but I'm not sure how to do it. Please help me to understand it.

Answer 1

Props are just parameters that the parent component sent to the children component. In your example this.props.cart and this.props.login are functions ( I am not sure about the cart , but it is used as a function ). From your example, when you click on the icons, you will call cart and login functions sent from the parent.

The answer to your question "How do you set onClick" is you already doing it on the login function/method. So you need to look at the parent component implementation.

Below I wrote a much more readable example, so feel free to look

import React from 'react'

class ChildrenComponent extends React.Component {
  render() {
    // This is doing the same thing, just we call the function / method in little different way
    // return <div onClick={() => { this.props.onShoppingSubmit() }}>Aaa</div>
    return <div onClick={this.props.onShoppingSubmit}>Aaa</div>
  }
}

class ParentComponent extends React.Component {
  handleShoppingSubmit = () => {
    // Do what every that function needs to do
    console.log('Hi from parent')
  }

  render() {
    return (
      <div>
        <ChildrenComponent onShoppingSubmit={this.handleShoppingSubmit} />
      </div>
    )
  }
}