[Solved] What is console.log in the render method of a react component showing?

“this” actually references the Javascript element depending on the context of it’s use. console.log(this). In my side, I am getting entire object. props: {history: {…}, location: {…}, match: {…}, staticContext: undefined, data: {…}, …} refs: {} state: null React automatically handles virtual dom manipulation. It implements something like Diffing Algorithm where it reconciles the dom … Read more

[Solved] Why doesn’t React automatically allow child components to call setState of the parent component?

React, and the Flux pattern (that helps manage complex application with multiple React components) espouse uni-directional data flow. Uni-directional data flow makes an application easy to reason, and debug because: If there is something wrong with a React component, you trace upwards to the parent recursively until you find the root cause, because the data … Read more

[Solved] Smart assuming of variable type

You can use https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates But you need to pass the variable const isLoaded = (response: ResponseData | undefined): response is ResponseData => { // some complex logic to check if the data is loaded and correct return !isLoading && !!data && Object.keys(data).length > 0 } return ( <> <div>My data title:</div> {isLoaded(data) && <div>{data.title}</div>} // … Read more

[Solved] How to align div in relation to each other? [closed]

demo It will only look like this if the internal browser’s width is greater than 600px. Otherwise, it will become a column. .App { display: flex; justify-content: space-between; } .App > :first-child, .App > :last-child { flex: 1; max-width: 300px; } .App > :last-child { text-align: right; } @media only screen and (max-width: 600px) { … Read more

[Solved] React json check if empty?

You can use this pattern to check for empty variables. If the field has a value then your <p> will render. If haaksort doesn’t exist on item.fields or the value of haaksort is undefined then the <p> won’t render. {item.fields.haaksoort && (<p>haaksoort: {item.fields.haaksoort}</p>)} A couple of notes on this though: item and fields must also … Read more