How do I chop/slice/trim off last character in string using Javascript?
You can use the substring function: This is the accepted answer, but as per the conversations below, the slice syntax is much clearer:
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Remove all child elements of a DOM node in JavaScript
Option 1 A: Clearing innerHTML. This approach is simple, but might not be suitable for high-performance applications because it invokes the browser’s HTML parser (though browsers may optimize for the case where the value is an empty string). Option 1 B: Clearing textContent As above, but use .textContent. According to MDN this will be faster than innerHTML as browsers won’t invoke their HTML parsers … Read more
How to compare arrays in JavaScript?
To compare arrays, loop through them and compare every value: Comparing arrays: Usage: You may say “But it is much faster to compare strings – no loops…” well, then you should note there ARE loops. First recursive loop that converts Array to string and second, that compares two strings. So this method is faster than use … Read more
Static variables in JavaScript
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
getElementById returns null?
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.
How can I determine if a variable is ‘undefined’ or ‘null’?
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.
Uncaught TypeError : cannot read property ‘replace’ of undefined In Grid
I think jQuery cannot find the element. First of all find the element or or Then try your code again
How to open a local disk file with JavaScript?
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
How to randomize (shuffle) a JavaScript array?
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)
Response to preflight request doesn’t pass access control check
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