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Users are less likely to get frustrated with a website if they get feedback that \"work\" is being done. Hence the ubiquity of progress indicators on the web. This is actually the original inspiration for Node.js:
\nDahl was inspired to create Node.js after seeing a file upload progress bar on Flickr. The browser did not know how much of the file had been uploaded and had to query the Web server. Dahl desired an easier way.\n
When a user submits a login form in the authentication flow it's desirable to give the user feedback that the request is in flight.
\n\nMaterial UI is an implementation of Google's material design in React.
\nMaterial UI has some fancy buttons. Let's make them even fancier by adding a spinner (progress indicator) that's activated when the user submits a login form and inactivated when authentication is complete.
\nOK, here's our button:
\nimport React from 'react'\nimport Button from '@material-ui/core/Button'\nconst LoginButton = (props) => {\n const {\n children,\n loading,\n ...rest\n } = props\n return (\n <Button {...rest}>\n {children}\n </Button>\n )\n}\n
\nNow let's add a progress indicator. Fortunately, Material UI has many such indicators to choose from.
\nimport React from 'react'\nimport Button from '@material-ui/core/Button'\nimport CircularProgress from '@material-ui/core/CircularProgress'\nconst styles = {\n root: {\n marginLeft: 5\n }\n}\nconst SpinnerAdornment = withStyles(styles)(props => (\n <CircularProgress\n className={props.classes.spinner}\n size={20}\n />\n))\nconst AdornedButton = (props) => {\n const {\n children,\n loading,\n ...rest\n } = props\n return (\n <Button {...rest}>\n {children}\n {loading && <SpinnerAdornment {...rest} />}\n </Button>\n )\n}\n
\nNow when authentication is in progress, we just need to set loading={true} and pass that as a prop to
Here's an example of what our parent component might look like:
\nimport React from 'react'\nimport TextField from '@material-ui/core/TextField'\nimport { withStyles } from '@material-ui/core/styles'\nimport { unstable_deferredUpdates as deferredUpdates } from 'react-dom'\nconst styles = theme => ({\n container: {\n position: 'absolute',\n width: '100%'\n },\n login: {\n boxShadow: '0 15px 35px rgba(50,50,93,.1), 0 5px 15px rgba(0,0,0,.07)',\n borderRadius: '4px',\n padding: '5vh',\n backgroundColor: '#fff',\n maxWidth: '340px',\n margin: '25vh auto',\n display: 'flex',\n flexDirection: 'column',\n justifyContent: 'space-between'\n },\n row: {\n display: 'flex',\n flexDirection: 'row',\n justifyContent: 'space-between'\n },\n button: {\n maxWidth: '200px',\n margin: theme.spacing.unit\n },\n gutter: {\n marginBottom: '1em'\n }\n})\nclass LoginForm extends React.Component {\n state = {\n email: '',\n password: '',\n loading: false\n }\n onChange = (key, { currentTarget }) => {\n this.setState({\n [key]: currentTarget.value\n })\n }\n \n loginOrCreateAccount = () => {\n if (this.state.loading) return\n deferredUpdates(() => {\n this.setState({ loading: true })\n })\n this.props.createAccountSomehow(this.state)\n .then(() => {\n deferredUpdates(() => {\n this.setState(prevState => prevState.loading\n ? { loading: false } : null\n })\n })\n }\n render () {\n return (\n <div>\n <form className={classes.login}>\n <div className={classes.gutter}>\n <TextField\n id='email'\n label='Email'\n value={this.state.email}\n onChange={evt => this.onChange('email', evt)}\n autoComplete='current-email'\n />\n <TextField\n id='password'\n fullWidth\n value={this.state.password}\n onChange={evt => this.onChange('password', evt)}\n placeholder='Password'\n margin='normal'\n autoComplete='current-password'\n />\n </div>\n <div className={classes.row}>\n <AdornedButton\n className={classes.button}\n fullWidth\n loading={this.state.loading}\n variant='flat'\n color='secondary'\n id='submit-login'\n onClick={this.loginOrCreateAccount}\n >\n Sign in\n </AdornedButton>\n <AdornedButton\n className={classes.button}\n fullWidth\n loading={this.state.loading}\n variant='raised'\n color='primary'\n onClick={this.loginOrCreateAccount}\n >\n Create account\n </AdornedButton>\n </div>\n </form>\n </div>\n )\n }\n}\nexport default withStyles(styles)(LoginForm)\n
\nWe've used the AdornedButton from the second snippet twice: once for the login button and once for the create account button.
\nThe overall strategy is straightforward: the user clicks one of two buttons (Login or Create Account), invoking this.loginOrCreateAccount(). Next, we toggle the loading state to true, authenticate the user, and toggle the loading the state back to false.
\n\nSuch aggressive setState() calls in one class method really flogs the render cycle. It's not ideal.
\nHence, we use unstable_deferredUpdates. unstable_deferredUpdates is an experimental feature React recently added. It's exported by the package react-dom starting with react-dom@16.4.2.
\nunstable_deferredUpdates accepts a function with a setState call. The intended use-case is a low priority update.
\n// Here's some annotated pseudo-code that may or may not be illuminating\nclass extends React.Component {\n ...\n loginOrCreateAccount = () => {\n // line below prevents concurrent requests\n if (this.state.loading) return\n // We set the loading state to true here.\n // This update is of course asynchronous.\n // I chose not to await the state change \n // because it may be more performant to start \n // authenticating the user at the same time.\n deferredUpdates(() => {\n this.setState({ loading: true })\n })\n this.props.createAccountSomehow(this.state)\n .then(() => {\n // Now we toggle the loading state back to false.\n // setState() accepts a function in addition to an object.\n // If a function is supplied, it is called with the most \n // recent version of this.state. \n // Returning null inside a functional setState call is \n // an escape hatch that lets us avoid updating state.\n deferredUpdates(() => {\n this.setState(prevState => prevState.loading\n ? { loading: false } : null\n })\n })\n }\n }
\nHere's the result:
\n\nAnd an implementation of the examples above in the wild: https://github.com/unshift/contentkit/blob/master/src/containers/Login/LoginPage.js
\n","avatar":"https://s3.amazonaws.com/contentkit/static/cjiy4tseq0tnw0103bc5s7sxj/material-ui.png"}}}}