javascript

Javascript Regular Expression Remove Spaces

I would recommend you use the literal notation, and the \s character class: There’s a difference between using the character class \s and just ‘ ‘, this will match a lot more white-space characters, for example ‘\t\r\n’ etc.., looking for ‘ ‘ will replace only the ASCII 32 blank space. The RegExp constructor is useful … Read more

Why is this jQuery click function not working?

You are supposed to add the javascript code in a $(document).ready(function() {}); block. i.e. As jQuery documentation states: “A page can’t be manipulated safely until the document is “ready.” jQuery detects this state of readiness for you. Code included inside $( document ).ready() will only run once the page Document Object Model (DOM) is ready for JavaScript code to execute”

TypeError: ‘undefined’ is not an object

I’m not sure how you could just check if something isn’t undefined and at the same time get an error that it is undefined. What browser are you using? You could check in the following way (extra = and making length a truthy evaluation) [update] I see that you reset sub and thereby reset sub.from … Read more

Javascript setInterval not working

A lot of other answers are focusing on a pattern that does work, but their explanations aren’t really very thorough as to why your current code doesn’t work. Your code, for reference: Let’s break this up into chunks. Your function funcName is fine. Note that when you call funcName (in other words, you run it) you will be alerting “test”. … Read more

JavaScript – cannot set property of undefined

you never set d[a] to any value. Because of this, d[a] evaluates to undefined, and you can’t set properties on undefined. If you add d[a] = {} right after d = {} things should work as expected. Alternatively, you could use an object initializer: Or you could set all the properties of d in an anonymous function instance: If you’re in an environment that supports ES2015 features, … Read more

How to change the buttons text using javascript

If the HTMLElement is input[type=’button’], input[type=’submit’], etc. change it using this code: If, the HTMLElement is button[type=’button’], button[type=’submit’], etc: change it using any of these methods, Please note that input is an empty tag and cannot have innerHTML, innerText or textContent button is a container tag and can have innerHTML, innerText or textContent Ignore this … Read more

+ More