state

问题 Take this finite-state machine: { initial: "foo", states: { foo: { on: { BAR: "bar" } }, bar: { on: { FOO: "foo" } } } } And in my component, I do this: import { useMachine } from "@xstate/react"; export default function() { const [current, send] = useMachine(machine); useEffect(() => { send("BAR"); }, []); return ( <> Hello World </> ); } This is perfectly valid code and the machine will switch to the "bar" state. Now, what happens if I do this? useEffect(() => { send("QUX"); }, []); The QUX

问题 I need a bit of help here, In an Ant Design table, I need to hide/show a particular column of a table depending on a state value. In the given sandbox link, I need to hide the surname column whenever the switch is Off and show when the switch is On. Please, someone, look into this, and help me out. Reference: https://codesandbox.io/s/purple-sun-1rtz1?file=/index.js 回答1: There is a working code, but it should be more customize, interactivize, and refactorize depending on your need: // You can

问题 Take this finite-state machine: { initial: "foo", states: { foo: { on: { BAR: "bar" } }, bar: { on: { FOO: "foo" } } } } And in my component, I do this: import { useMachine } from "@xstate/react"; export default function() { const [current, send] = useMachine(machine); useEffect(() => { send("BAR"); }, []); return ( <> Hello World </> ); } This is perfectly valid code and the machine will switch to the "bar" state. Now, what happens if I do this? useEffect(() => { send("QUX"); }, []); The QUX

问题 I need to pass state variable as a parameter to external function. I am trying to do something like this. https://stackblitz.com/edit/react-vvdfx4?file=index.js Expected to work like a slackblits link provided It is working properly here but unable to figure out why it is throwing error in my project. I am passing array of object as argument. `GlobalHeader.js:340 Uncaught TypeError: Object(...) is not a function at GlobalHeader.temp (GlobalHeader.js:340) at GlobalHeader.<anonymous>

问题 Take this finite-state machine: { initial: "foo", states: { foo: { on: { BAR: "bar" } }, bar: { on: { FOO: "foo" } } } } And in my component, I do this: import { useMachine } from "@xstate/react"; export default function() { const [current, send] = useMachine(machine); useEffect(() => { send("BAR"); }, []); return ( <> Hello World </> ); } This is perfectly valid code and the machine will switch to the "bar" state. Now, what happens if I do this? useEffect(() => { send("QUX"); }, []); The QUX

问题 In my header component, I have conditional rendering set to display different links depending on if the user is logged in or not. The conditional rendering works fine EXCEPT the fact that it blinks one set of links before displaying the proper set of links. It dawned on me this is because of the axios.get call I have that retrieves the user's status. The state variable is initially set to false. If the user is logged in, the get call will indicate that and the state variable will get set to

问题 I have this array Object in State called formRating formRating:Array[22] 0: {…} condId: "C2.1(a)" rate: "N/A" 1: {…} condId:"C2.2(b)" rate:"3" 2: {…} 3: {…} I also have a few RadioGroups in the render letting the user manipulate the state object above. <Grid item xs={7} style={{marginTop:32}}> Condition 1</Grid> <Grid item ><RadioGroup name="C2.1(a)" defaultValue={this.getDefaultValue('C2.1(a)')} onChange={this.changeButton("C2.1(a)")} style={{display: 'flex', flexDirection: 'row'}}> What

问题 I have three widgets first one is LightBulb(stateless) that have some color properties. The second one is widget named as LightColorSelector(stateless) that has a DropdownMenu with string type items Red , Green and Blue . And, the third class is Classroom(stateful widget) which is the parent of that two classes. My aim is to set the states from that class. I need to set a list of that three colors inside the Classroom , when someone clicks on one of the LightColorSelector items the LightBulb

问题 I have a toggle button that show and hides text. When the button is clicked I want it to hide another component and if clicked again it shows it. I have created a repl here: https://repl.it/repls/DapperExtrasmallOpposites I want to keep the original show / hide text but I also want to hide an additional component when the button is clicked. How to I pass that state or how do I create an if statement / ternary operator to test if it is in show or hide state. All makes sense in the repl above!

问题 in swiftui, I have a state variable count ,which is optional, in the sheet present ,I unwrap the optional and show Detailview, but it seems never hit there. any idea how why not hit there? it seems never hit DetailView(count: num) import SwiftUI struct ContentView: View { @State var showDetailView = false @State var count : Int? var testArr = [1,2,3,4,5] var body: some View { NavigationView { List(testArr.indices){ indice in Text("row num \(indice)") .onTapGesture{ self.showDetailView = true