![]() This one doesn't use a true/false switch. You could put in another state variable to watch for this and prevent it from happening.Īnd here's another example from NMeuleman (it's setup in a more traditional way than scalling the script directly so it looks a little different). So, if something else causes a re-render while it was fetching, it would fetch again. While the value is true, it pulls on every re-render.In React JS, at the top of your component, import the. In React JS, To use the useState Hook, we first need to import it into our component. In React JS, state generally refers to data or properties that need to be tracking in an application. If the component is re-rendered while "pageFetchInProgress" is false, it doesn't pull the page again. In React JS, the React useState Hook allows us to track state in a function component.Navigate to the about route, then back to home and you'll see Uncaught (in promise) TypeError: u is null from the hooks script. Before jumping into our App, we need to remember that to use the state hook we need to import. This means that on the first render of your component, count 0. Following from the example above, the value of the initial state is 0. When it's done, it updates the data and returns the state of pageFetchInProgress to false. Starting at the home route, you'll see the counter component works fine. useState is the state hook and it accepts only one argument the value of the initial state. When that happens, the useEffect sees the new state and fires off the fetch. ![]() I setup a state object that gets updated when the button is pushed which causes a re-render of the component. The thing that took me the longest to figure out was how to do the trigger itself.In a regular app, you'd use instead of.This example uses to call versions of react and babel to make it stand alone, but the script will function in a regular React app.ReactDOM.render(, document.getElementById('root')) įetching Remote Data With A Button Click And Error HandlingĬonst = eState('TBD')Ĭonst = eState(false) This is how I'm fetching data from a remote API via a button's onClick event handler in React. fetching-data-from-an-api-with-a-button-onclick-event-handler-in-react fetching-data-from-an-api-with-a-button-onclick-event-handler-in-react-2 TODO: Combine these two posts into one (or eliminate one if they are duplicates)
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