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
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.
I think you’re missing your routes, you need to define at least one route for example ‘/’ to index. e.g.
The 500 code would normally indicate an error on the server, not anything with your code. Some thoughts Talk to the server developer for more info. You can’t get more info directly. Verify your arguments into the call (values). Look for anything you might think could cause a problem for the server process. The process … Read more
If you don’t want to mess with HTML elements: Show code snippet This uses the HTMLAudioElement interface, which plays audio the same way as the <audio> element. If you need more functionality, I used the howler.js library and found it simple and useful. Show code snippet
Current JavaScript From ES6 on you could use template strings: See Kim’s answer below for details. Older answer Try sprintf() for JavaScript. If you really want to do a simple format method on your own, don’t do the replacements successively but do them simultaneously. Because most of the other proposals that are mentioned fail when a replace string … Read more
Javascript has a reverse() method that you can call in an array Not sure if that’s what you mean by ‘libraries you can’t use’, I’m guessing something to do with practice. If that’s the case, you can implement your own version of .reverse() Do note that the built-in .reverse() method operates on the original array, thus you don’t need to … Read more
Use this: Basically, the slice() operation clones the array and returns a reference to a new array. Also note that: For references, strings and numbers (and not the actual object), slice() copies object references into the new array. Both the original and new array refer to the same object. If a referenced object changes, the changes are visible to both … Read more
Move the options part to the Chart creation: Here’s an example from the docs.
If you are interested in finding out whether a variable has been declared regardless of its value, then using the in operator is the safest way to go. Consider this example: But this may not be the intended result for some cases, since the variable or property was declared but just not initialized. Use the in operator for a … Read more