Things evolve. ReactJS evolves. With version 16.3, there were several changes to the component life-cycle methods. In particular, componentWillReceiveProps is disappearing. In its place, they say, you can use the getDerivedStateFromProps static function. I found this a bit challenging, but I did find an interesting pattern when the component-state was dependent on fetched information.
I should mention that I had a specific goal to better encapsulate data within the component. While I could pass in all the needed data as properties, that would reqire the surrounding component know what to pass and how to get it. That shouldn’t necessarily be necessary; the component knows what it needs and how to retrieve it.
For example, say you have a component which accepts a phone number and displays the phone number and the state that it’s from. Certainly, you could write a simple component that accepts both pieces of information as properties.
[code language=”html” gutter=”false”]
<ShowPhoneLocation number="+12065551212" city="Seattle" />
[/code]
Which might be implemented as:
[code language=”js” gutter=”false”]
class ShowPhoneLocation extends React.Component {
render() {
return (
<div>{this.props.number} is from {this.props.city}</div>
)
} // render()
} // class ShowPhoneLocation
[/code]
But, since the component should be able to infer the state from the phone number (by its area code), it shouldn’t be incumbent on its container to know what it is.
[code language=”js” highlight=”2-7″]
class ShowPhoneLocation extends React.Component {
static getDerivedStateFromProps(nextProps, prevState) {
let location = getCityFromPhone(nextProps.number)
return {
city: location
}
}
render() {
return (
<div>{this.props.number} is from {this.state.city}</div>
)
} // render()
} // class ShowPhoneLocation
[/code]
That’s all well and good, but what if getCityFromPhone() has to call a web service? We don’t want getDerivedStateFromProps() to stall, waiting for a response. However, it is static and does not have a this reference to the object for which it is returning state; so an asynchronous fetch doesn’t know what object’s state to set. Instead, don’t wait for the result to save in the state, save the request’s Promise in the state and update the state, once the promise resolves.
[code language=”js” highlight=”1-3,11-18,22-24″]
function getCityFromPhone(number) {
return fetch(‘http://saas.com/get/’+number+’/city’) // Returns fetch promise
}
class ShowPhoneLocation extends React.Component {
static getDerivedStateFromProps(nextProps, prevState) {
let location = getCityFromPhone(nextProps.number)
return {
city: location
}
}
componentDidUpdate() {
let location = this.state.city
if (location instanceof Promise) {
this.setState({ city: ‘…waiting…’ })
location.then(city => this.setState({ city: city }) )
.catch(() => this.setState({ city: ‘not found’ }) )
}
}
render() {
return (
<div>
{this.props.number} is from {this.state.city instanceof Promise
? ‘…’
: this.state.city}</div>
)
} // render()
} // class ShowPhoneLocation
[/code]
In componentDidUpdate() you can define the completion handlers to set the object’s state, base on the returned information from the service.
It is a common pattern to perform a fetch in componentDidMount(). The problem is that there may not be enough information to perform the fetch, that early, or the information for the fetch changes after the component has been mounted.
I am going to miss componentWillReceiveProps() — without it, things become a bit more convoluted — but it’s going the way of the Dodo.
It was 
Okay, back to basics, the very low level basics. HTTP is text based, telnet enables a network connection via a text-based command line. All good. We can use telnet to talk to a web server by manually typing text to it, if you know the details of the content syntax to send HTTP via telnet.
I was playing with ES6’s new 
A long time ago, I’d endeavored to create my own lightweight 
The more I use 
git
As I mentioned in my prior post
Catching the Technology Train, After I’d Disembarked
The result is that, not only do I need to learn new languages and their nuances, I even need to learn a new workflow, a new way of doing programming. While I am not starting from scratch, a lot of my prior “expertise” is not directly applicable; so it feels like starting from scratch.
I could just stick to the old technologies that I am still expert at, but that isn’t cutting edge. Still I could do that. Then I wouldn’t have anything to be stressed about. And, that wouldn’t be so bad, now would it?
Posted in Commentary