state

问题 I'm trying to build a simple unit convertor to practice React.js. I want to be able to change the value of one unit eg: Kg, and have the other unit eg: lb to automatically change on the screen. Please see this website to give you an idea: http://www.convertunits.com/from/lb/to/kg I have the following code, it renders but the units don't update. What I want to know is: Is it even accurate for one component to have two states ? 1 for Kg and another for lb Or would they need to be sibling

问题 I'm trying to build a simple unit convertor to practice React.js. I want to be able to change the value of one unit eg: Kg, and have the other unit eg: lb to automatically change on the screen. Please see this website to give you an idea: http://www.convertunits.com/from/lb/to/kg I have the following code, it renders but the units don't update. What I want to know is: Is it even accurate for one component to have two states ? 1 for Kg and another for lb Or would they need to be sibling

问题 I'm trying to build a simple unit convertor to practice React.js. I want to be able to change the value of one unit eg: Kg, and have the other unit eg: lb to automatically change on the screen. Please see this website to give you an idea: http://www.convertunits.com/from/lb/to/kg I have the following code, it renders but the units don't update. What I want to know is: Is it even accurate for one component to have two states ? 1 for Kg and another for lb Or would they need to be sibling

问题 I have checkboxes in my custom listview, I'm using a boolean array to save the state of these checkboxes. I want to make the state of checkboxes persistent through out the lifetime of the app.I know that this can be achieved through sharedpreferences, but I don't exactly know how this can be done. 回答1: I know that this can be achieved through sharedpreferences, but I don't exactly know how this can be done. There is no option to push serializable objects into sharedpreferences. Because of

问题 I have two exactly the same web sites hosted in two different machines under IIS 7.5. ASP.NET state service is running on my machine and the web.config is updated in both sites with the following code: <sessionState mode="StateServer" stateConnectionString="tcpip=192.168.1.77:42424" cookieless="false" timeout="120"/> The allow remote connection is set to 1 in registry in order for the second web site to access the state server. Both web sites have the same machine key: <machineKey

问题 Is there a way without using Redux with which I can from my home.js page (I'm using hooks not classes) set/use a state, pass it to my component MyComponent.js and once a div is clicked inside this component update the state (so for the home.js page as well)? In home.js I have something like: export default function Page({ session, items }) { const [selectedTab, setSelectedTab] = useState('main') const handleSelect = (e) => { setSelectedTab(e); } ... // then I return some react-bootstrap tabs,

问题 Is there a way without using Redux with which I can from my home.js page (I'm using hooks not classes) set/use a state, pass it to my component MyComponent.js and once a div is clicked inside this component update the state (so for the home.js page as well)? In home.js I have something like: export default function Page({ session, items }) { const [selectedTab, setSelectedTab] = useState('main') const handleSelect = (e) => { setSelectedTab(e); } ... // then I return some react-bootstrap tabs,

问题 I am new to React and have a question regarding passing down functions in a state. I have a couple of 'sorting functions' in my util folder, which look like this: export const sortColdestSummerCountries = (filteredCountries) => { return filteredCountries.sort( (a, b) => a.avsummertemp20802099 - b.avsummertemp20802099 ); }; and a few others: sortHighestSummerTemp, sortLargestIncreaseHotDays, sortColdestSummerCountries, sortMostColdDays, sortWorstAffectedCountries which pretty much look similar

问题 Using redux router, In my components I have access to the params object with information about by URL. However, inside my actioncreators, I get the state through getState() , and thus the params props has not been injected. Is there a way around this? 回答1: to get access params in action creators, you should pass it: in component this.props.someAction(this.props.params) in action creator const someAction = (params)=>{ let {data} = params; .... } to get access params in selector, you should

问题 Using redux router, In my components I have access to the params object with information about by URL. However, inside my actioncreators, I get the state through getState() , and thus the params props has not been injected. Is there a way around this? 回答1: to get access params in action creators, you should pass it: in component this.props.someAction(this.props.params) in action creator const someAction = (params)=>{ let {data} = params; .... } to get access params in selector, you should