It will import updated data.json, get array of image file names and pass it to createImages function call. This is because React is only re-rendering when either the props or the state change. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesOne gotcha I just worked out of this is that you must provide a dot in order for any other variable to be recognised i.e. Dynamically changing CSS classes. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under
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When the state of a component changes, React performs a re-render. The name of the button gets passed down to the component as a prop. So we can react to state changes within our render function. You always know your components anyway, and need to load them. Refer to the updated post, Loading React Components Dynamically on Demand using React.lazy if you are using v16.6.0+.
Dynamically changing CSS classes. There must be a more elegant solution to this problem.You could just store your component class in a variable with a name that starts with an uppercase letter. What happens when you need a more elegant solution for conditionally rendering these though?If and switch statements can do the job fine for a predefined list of components, but what if you want to set it directly based on a prop passed into the parent component?Your initial idea may be to do something similar to what is shown below.
This lets us use the same component abstraction for any level of detail.
The Overflow Blog @Inkling, I agree. In the above code, we first imported two components (UserA, UserB) then we added it to the components object. Think about it this way: React needs a way to distinguish between multiple instances of a child component (our Image component is a child component of Application component) when they're created dynamically. This wont work and will cause a compiler error.You can’t use a general expression to do this, its not how JSX works. As nilgun previously pointed out, the component slug should not be wrapped in curly braces. your coworkers to find and share information. Variable name shall start with a capital letter. I.e. Scott Carmichael. Overview. Second, mutations are prone to unexpected bugs. Stack Overflow works best with JavaScript enabled Is this not something React
Here is the demo code structure. Earlier today, I needed to add some classes to a link. var page;
By using our site, you acknowledge that you have read and understand our Stack Overflow works best with JavaScript enabled If you decide to store it in a variable, make sure it starts with a capital letter.If your intention is to inject the actual component rendered, you can do something like this, which is very convenient for testing, or whatever reason you would want to dynamically inject components to render.I am not a React expert, but I think every component should be construct with a specific tag at the beginning. Naturally, the value for key property must be unique. One class was passed in through a prop, but the other class would be added based on a boolean condition.
One gotcha I just worked out of this is that you must provide a dot in order for any other variable to be recognised i.e. Featured on Meta Mutating the state object, or any nested object, keeps the identity of the object, and React thinks nothing has changed. Built for high performance rendering similar to google sheets. First, we need to create two new components so that we can use them for dynamic rendering.