Category : state

I have a drop down: <Dropdown id="JobPlanDD" selectedKey={(this.state["JobPlanDD-option"]) ? (this.state["JobPlanDD-option"]).key : undefined} placeholder="Select…" onChange={(e, i) => this.handleChange(e, i)} options={jobPlanDDOptions} /> And I have a handler for that drop down and any others I make in the future: const id = evt.target.querySelector(‘span’).id; const theItem = item.text; console.log(id, ‘id’); console.log([id], ‘[id]’); console.log(theItem, ‘theItem’); this.setState({ [id]: theItem }, ..

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I have a parent component App that renders ChildA and ChildB function App() { const [obj, setObj] = useState<MyObject | null>(null); //state to decide if display component should be rendered in the DOM or not const [renderChildB, setRenderChildB] = useState<Boolean>(false) function callbackWCChanged(obj: MyObject) { setObj(obj); } function unmountDisplay() { setWordCountObj(null); setRenderDisplay(false); } return ( <div ..

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I am updating initial state based on onchange event passed by textboxes to event handler , as below – import React,{useState} from ‘react’ function ViewAll() { const iCandidateState={ Name:”, Age:”, Qalification:” }; function nameHandler(event){ alert(event.target.value); this.iCandidateState.Name=event.target.value; } return ( <div> <table> <tr> <td> Name </td> <td> <input type="text" name="txtName" value={iCandidateState.Name} onChange={(e)=>nameHandler(e)}></input> </td> </tr> <tr> <td> ..

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I’m trying to move from componentWillReceiveProps to getDerivedStateFromProps and in some cases, I was successful but when the case is append the props to the existing state, the things start to not behaving the same way. In this case, I have a child component that is used to print/show the data while uses a delete ..

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I have a state that updates the time every second with setTimeout, but I can not clear it with ClearTimeout. When I print timerClear value, it shows me different values. var timerClear ; const [MyTime, setMyTime] = useState(”); useEffect(() => { timerClear = setInterval(() => { setMyTime( realeTime.toLocaleTimeString([], { timeZone: "Asia/Tehran", hour: ‘2-digit’, minute: ‘2-digit’, ..

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I’m trying to convert this Lua finite state machine class into JavaScript, but I don’t think I’m implementing the change method correctly. Does anyone have any ideas on how to covert this code into JavaScript? StateMachine = Class{} function StateMachine:init(states) self.empty = { render = function() end, update = function() end, enter = function() end, ..

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