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shape collage pro 5.6 shape collage pro 5.8Q: Is there a way to prevent loading a page while data is loading in React? I'm developing a web application using React. In my application I load in JSON data for my component, and then display this data. Since data takes time to load, when I open the application, I get a lag. I would like to delay opening the application until the data has loaded. How can I do this? A: There's several ways you can solve this. Here's an example of a basic solution which is using setTimeout(). It doesn't include any timing, error handling, etc. componentDidMount() { setTimeout(() => { this.setState({ data: "Foo", }); }, 1000); } componentWillReceiveProps(nextProps) { if (nextProps.data) { setTimeout(() => { this.setState({ data: "Bar", }); }, 1000); } } This one would also need an error handling, etc. componentDidMount() { fetch(url) .then(response => response.json()) .then(json => this.setState({ data: json })); } Since the data is async, it can sometimes cause the componentWillReceiveProps to be called before the data has finished loading. You can use the componentWillUpdate method. componentWillUpdate(nextProps) { if (nextProps.data) { setTimeout(() => { this.setState({ data: "Bar", }); }, 1000); } } Here's an example of using this.state instead of setState(). The predictive value of the HLA-B35 allele in the development of primary antiphospholipid syndrome. Antiphospholipid syndrome (APS) is an autoimmune disease that involves thrombosis and recurrent fetal
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