If you come from a class-based, statically typed object-oriented language (like Java, C++ or C#) I assume that you are trying to create a variable or method associated to a “type” but not to an instance. An example using a “classical” approach, with constructor functions maybe could help you to catch the concepts of basic OO JavaScript: … Read more
It can be caused by: Invalid HTML syntax (some tag is not closed or similar error) Duplicate IDs – there are two HTML DOM elements with the same ID Maybe element you are trying to get by ID is created dynamically (loaded by ajax or created by script)? Please, post your code.
You can use the qualities of the abstract equality operator to do this: Because null == undefined is true, the above code will catch both null and undefined.
I think jQuery cannot find the element. First of all find the element or or Then try your code again
Here’s an example using FileReader: Specs http://dev.w3.org/2006/webapi/FileAPI/ Browser compatibility IE 10+ Firefox 3.6+ Chrome 13+ Safari 6.1+ http://caniuse.com/#feat=fileapi
The de-facto unbiased shuffle algorithm is the Fisher-Yates (aka Knuth) Shuffle. See https://github.com/coolaj86/knuth-shuffle You can see a great visualization here (and the original post linked to this)
As far as PHP is concerned (or really, a web server in general), an HTML page is nothing more complicated than a big string. All the fancy work you can do with language like PHP – reading from databases and web services and all that – the ultimate end goal is the exact same basic … Read more
You are running into CORS issues. There are several ways to fix/workaround this. Turn off CORS. For example: how to turn off cors in chrome Use a plugin for your browser Use a proxy such as nginx. example of how to set up Go through the necessary setup for your server. This is more a factor of … Read more
You rewrite the context of the class method when you pass it to props like this because of JS OOP system. So to make it work there are several approaches: 1) This is not so good because bind always returns new function and your component will re-render even if there are no updates in props … Read more
Some browsers such as Firefox, Chrome, Safari, Opera and IE10+ can handle Base64 natively. Take a look at this Stackoverflow question. It’s using btoa() and atob() functions. For server-side JavaScript (Node), you can use Buffers to decode. If you are going for a cross-browser solution, there are existing libraries like CryptoJS or code like: http://ntt.cc/2008/01/19/base64-encoder-decoder-with-javascript.html (Archive) With the latter, you need to thoroughly test … Read more