Javascript Uncaught SyntaxError: Unexpected identifier
old school (internet explorer), you need to change as the previous answers stated ES2015 (ES6) has a shorthand
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How to set NODE_ENV to production/development in OS X
Before running your app, you can do this in console, Or if you are in windows you could try this: for PowerShell: or you can run your app like this: You can also set it in your js file: But I don’t suggest to do it in your runtime file, since it’s not easy to … Read more
TypeScript React.FC confusion
Function ComponentsThese can be written as normal functions that take a props argument and return a JSX element. What about React.FC/React.FunctionComponent? You can also write components with React.FunctionComponent (or the shorthand React.FC): Some differences from the “normal function” version: It provides typechecking and autocomplete for static properties like displayName, propTypes, and defaultProps – However, there are currently known issues using defaultProps with React.FunctionComponent. See this issue for details … Read more
How do I test for an empty JavaScript object?
ECMA 5+: Note, though, that this creates an unnecessary array (the return value of keys). Pre-ECMA 5: jQuery: lodash: Underscore: Hoek ExtJS AngularJS (version 1) Ramda
Open a URL in a new tab (and not a new window)
Nothing an author can do can choose to open in a new tab instead of a new window; it is a user preference. (Note that the default user preference in most browsers is for new tabs, so a trivial test on a browser where that preference hasn’t been changed will not demonstrate this.) CSS3 proposed target-new, but the … Read more
Remove element by id
The DOM is organized in a tree of nodes, where each node has a value, along with a list of references to its child nodes. So element.parentNode.removeChild(element) mimics exactly what is happening internally: First you go the parent node, then remove the reference to the child node. As of DOM4, a helper function is provided to do … Read more
How to read a local text file?
You need to check for status 0 (as when loading files locally with XMLHttpRequest, you don’t get a status returned because it’s not from a Webserver) And specify file:// in your filename:
Cannot open local file – Chrome: Not allowed to load local resource
We use Chrome a lot in the classroom and it is a must to working with local files. What we have been using is “Web Server for Chrome”. You start it up, choose the folder wishing to work with and go to URL (like 127.0.0.1:port you chose) It is a simple server and cannot use … Read more
Scroll to an element with jQuery
Assuming you have a button with the id button, try this example: I got the code from the article Smoothly scroll to an element without a jQuery plugin. And I have tested it on the example below.