Nested JSON objects – do I have to use arrays for everything?
You don’t need to use arrays. JSON values can be arrays, objects, or primitives (numbers or strings). You can write JSON like this: You can use it like this:
javascript
Setting “checked” for a checkbox with jQuery
Modern jQuery Use .prop(): DOM API If you’re working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property: The benefit to using the .prop() and .attr() methods instead of this is that they will operate on all matched elements. jQuery 1.5.x and below The .prop() method is not available, so you need to use .attr(). Note that this is the … Read more
After $npm install, Getting Error: Cannot find module ‘../lib/utils/unsupported.js’
Uninstall node brew uninstall –force node Remove the /usr/local/lib/node_modules folder Install it again brew install node
JavaScript “Uncaught TypeError: object is not a function” associativity question
JavaScript does require semicolons. It’s just that the interpreter will insert them for you on line breaks where possible*. Unfortunately, the code does not result in a syntax error, so no ; will be inserted. (An example which can run is To avoid surprises like this, train yourself to always end a statement with ;. * This is just a rule … Read more
‘react-scripts’ is not recognized as an internal or external command
I’ve got a maven project, within which is JavaScript project cloned as a git sub-module. So the directory structure looks like mavenapp/src/main/javascript/[npm project files] Inside my package.json, the test looks like this: but when I try to run npm test, it says ‘react-scripts’ is not recognized as an internal or external command, Interestingly, when I clone the … Read more
Check if a variable is a string in JavaScript
You can use typeof operator: Example from this webpage. (Example was slightly modified though). This won’t work as expected in the case of strings created with new String(), but this is seldom used and recommended against[1][2]. See the other answers for how to handle these, if you so desire. The Google JavaScript Style Guide says to never use primitive object … Read more
AngularJS- Login and Authentication in each route and controller
My solution breaks down in 3 parts: the state of the user is stored in a service, in the run method you watch when the route changes and you check if the user is allowed to access the requested page, in your main controller you watch if the state of the user change. You should … Read more
ReferenceError: fetch is not defined
I have this error when I compile my code in node.js, how can I fix it? RefernceError: fetch is not defined This is the function I am doing, it is responsible for recovering information from a specific movie database.
What is the “right” JSON date format?
JSON itself does not specify how dates should be represented, but JavaScript does. You should use the format emitted by Date‘s toJSON method: 2012-04-23T18:25:43.511Z Here’s why: It’s human readable but also succinct It sorts correctly It includes fractional seconds, which can help re-establish chronology It conforms to ISO 8601 ISO 8601 has been well-established internationally for more than a decade ISO 8601 is endorsed … Read more
Parse Error: Adjacent JSX elements must be wrapped in an enclosing tag
I am trying to set up my React.js app so that it only renders if a variable I have set is true. The way my render function is set up looks like: Basically, the important portion here is the if(this.state.submitted==false) portion (I want these div elements to show up when the submitted variable is set to false). But when running this, I get … Read more