JavaScript Array Push key value
You have to use bracket notation: The result will be: Maybe instead of an array of objects, you just want one object with two properties: and This will result in x = {left: 0, top: 0}.
javascript
How do I handle newlines in JSON?
This is what you want: You need to escape the \ in your string (turning it into a double-\), otherwise it will become a newline in the JSON source, not the JSON data.
Uncaught ReferenceError: ga is not defined
I created a simple HTML with the same JS and click handler and ran it in my local apache server, it just works fine. Don’t see any reference errors. Make sure you don’t have AdBlocker or other software preventing tracking which might be blocking the GoogleAnalytics `
JavaScript single line ‘if’ statement – best syntax, this alternative?
I’ve seen the short-circuiting behaviour of the && operator used to achieve this, although people who are not accustomed to this may find it hard to read or even call it an anti-pattern: Personally, I’ll often use single-line if without brackets, like this: If I need to add more statements in, I’ll put the statements on the next line … Read more
Strip all non-numeric characters from string in JavaScript
Use the string’s .replace method with a regex of \D, which is a shorthand character class that matches all non-digits:
Write / add data in JSON file using Node.js
If this JSON file won’t become too big over time, you should try: Create a JavaScript object with the table array in itvar obj = { table: [] }; Add some data to it, for example:obj.table.push({id: 1, square:2}); Convert it from an object to a string with JSON.stringifyvar json = JSON.stringify(obj); Use fs to write the … Read more
bootstrap buttons onclick events
change this to as you are applying event on btn-next ID $(‘#btn-next’).on(‘click’
what is the best way to check variable type in javascript
The best way is to use the typeof keyword. The typeof operator maps an operand to one of six values: “string”, “number”, “object”, “function”, “undefined” and “boolean”. The instanceof method tests if the provided function’s prototype is in the object’s prototype chain. This Wikibooks article along with this MDN articles does a pretty good job of summing up JavaScript’s types.
How to force JavaScript to deep copy a string?
JavaScript’s implementation of ECMAScript can vary from browser to browser, however for Chrome, many string operations (substr, slice, regex, etc.) simply retain references to the original string rather than making copies of the string. This is a known issue in Chrome (Bug #2869). To force a copy of the string, the following code works: This … Read more