Values used in JavaScript multiplication are converted to numbers with the Number() casting function before they are used in the operation. Empty strings will become 0 and Boolean true will become 1. Addition on strings concatenates the two strings. If one of the operators is a string and the other is not, the non-string is […]
JavaScript Operators Read More »
JavaScript uses the increment (++) and decrement (–) on all data types. Putting the operator before the variable will change the value before the final evaluation of the statement. Putting the operator after the variable will change the value after the evaluation. Using the increment/decrement operator on a string first converts the value to a
JavaScript Objects, Unary Operators and Logical Operators Read More »
\n inside the string is used for ‘new line’ and \t is used for ‘tab’. Once a string has been defined in JavaScript it’s value can not change. To get around this, when you use operators to change the string, a new string is created and the old string is destroyed, all behind the scenes.
JavaScript Strings Read More »
JavaScript’s NaN stands for ‘Not a Number’. This is used when an operation that should have returned a number has failed. NaN used in any operation will always return NaN. NaN is not equivalent to any value, including itself. (NaN == NaN) returns false. You can test this value with the isNaN() function. Booleans, strings
JavaScript Numbers: Number(), parseInt(), parseFloat() Read More »
Uninitialized variables show as a type of undefined. So do variables that haven’t been declared at all. We should always initialize variables so that we know that undefined means we haven’t declared the variable. null is an empty object pointer. We should initialize objects to null so that the typeof will return the correct data
JavaScript Variables: Initialization, Booleans, and Numbers Read More »
Everything in JavaScript is case-sensitive. Characters in an identifier name (variable, function or property) can be letters, numbers, underscore or dollar sign. The first character can not be a number. Of course, keywords can not be used as identifiers. Using camelCase for identifiers is the best case practice. Comments in JavaScript are // for single
JavaScript Identifiers and Conventions Read More »
I have decided to spend more of my time and energy learning more JavaScript and to keep the notes here for me to look back at, as well as to help others who may also be interested in learning more JavaScript programming. I don’t think JavaScript is going away anytime soon because it’s now on
We often use accordions on FAQ pages for our clients. I get asked by designers which plugin to use for a good accordion. I find it much more efficient and fairly easy to add my own accordion code. Too many plugins can slow down your WordPress site and require more updates. Here’s how to add
Adding an Accordion to Your WordPress Website Read More »
I found a cool little tool that lets me add notifications to my desktop from my websites – Hooks. It was easy to install and get working. After I downloaded the Mac app which gave me my API key, I included the javascript file in my html page. Now I can use one small javascript
Displaying Notifications from your Website on your Mac Desktop – Hooks Read More »
I mentioned the sliding pop-up that my client wanted on her page here. I fixed it where it would pop-up – or slide in – every time someone visited the home page. After the first couple of visits, I was irritated by the pop-up and didn’t want to see it again. I assume that other
Hiding my Pop-up When a Visitor Returns if They've Chosen Not to See it Again Read More »
