Author: admin@master

Disable / Enable Chrome Extension Via Browser Action / Icon

google-chrome google-chrome-extension javascript

The chrome extension I am developing inserts content scripts and css onto every page of a website. However, the user may have a certain page or pages he or she does not want the extension to run on, so it would be great if I could set up the browser action as basically a toggle on / off. What I’d

Regexp javascript – url match with localhost

javascript regex

I’m trying to find a simple regexp for url validation, but not very good in regexing.. Currently I have such regexp: (/^https?://w/).test(url) So it’s allowing to validate urls as http://localhost:8080 etc. What I want to do is NOT to validate urls if they have some long special characters at the …

countup and countdown loop

javascript setinterval

I want to count from 3 down to 0 then back up to 3 in a loop. This is kind of “slider” implementation. Everything runs fine until reach the clearInterval from counterry. What am I missing? Answer Use a single loop:

WebAudio not playing after stop(0)

javascript web-audio-api

I’m writing something like a web-audio-editor, and I think I’m close to finishing the basics. I can play and stop an audiofile, but when I try to call the play method again it just won’t work, even though the parameters havn’t changed. I’d be glad to see someone look into my prob…

JavaScript: use defineProperty accessor on an array’s .length?

arrays defineproperty ecmascript-5 google-chrome javascript

I would like (mainly for academic reasons) to be able to set an accessor on an array’s length using Object.defineProperty(), so than I can notify for size changes. I am aware of ES6 object observe, and watch.js, but I would like to attempt to do this in ES5 without extra libraries if possible, even if t…

JavaScript set anonymous Object key to variable name

javascript

However, this yields an object with a key of “key”! How can I create a new object with a key of the value of the variable key? Answer You can do this: There’s no way to do it in JavaScript within the object literal itself; the syntax just doesn’t provide for that. edit — when this answ…

Why is this jQuery click function not working?

click javascript jquery onclick onclicklistener

Code: The above code doesn’t work. When I click on #clicker, it doesn’t alert and and it doesn’t hide. I checked the console and I get no errors. I also checked to see if JQuery was loading and indeed it is. So not sure what the issue is. I also did a document ready function with an alert an…

Resize ArrayBuffer

arrays javascript

If I want to create an arraybuffer, I write: var buff = new ArrayBuffer(size) But how is it possible to resize an existing buffer? I mean, adding some more bytes at the end of the buffer. Answer I’ve done it in C++ like this. Just made a bigger array and copy the contents over and then return the larger…

index operator in handlebars say Unexpected token ,

ember.js handlebars.js javascript

I have #each loop in my ember app and want to know index of loop, so I try to using {{@index}} like this : But in chrome, I get this error: My ember.js version is rc8 and handlebars is 1. I need a solution to find index of #each. Answer You can get the contentIndex from itemViewClass of the #each