I need a quick algorithm to select 5 random elements from a generic list. For example, I’d like to get 5 random elements from a List<string>. 32 Answers 32 Using linq: YourList.OrderBy(x => rnd.Next()).Take(5)
Say I have this: <div class=”class1 class2″></div> How do I select this div element? document.getElementsByClassName(‘class1’)[0].getElementsByClassName(‘class2’)[0] That does not work. I know that, in jQuery, it is $(‘.class1.class2′), but I’d like to select it with vanilla JavaScript. 8 Answers 8
I’m brand new to jQuery and have some experience using Prototype. In Prototype, there is a method to “flash” an element — ie. briefly highlight it in another color and have it fade back to normal so that the user’s eye is drawn to it. Is there such a method in jQuery? I see fadeIn, … Read more
In Javascript, I’m trying to take an initial array of number values and count the elements inside it. Ideally, the result would be two new arrays, the first specifying each unique element, and the second containing the number of times each element occurs. However, I’m open to suggestions on the format of the output. For … Read more
I need to choose some elements from the given list, knowing their index. Let say I would like to create a new list, which contains element with index 1, 2, 5, from given list [-2, 1, 5, 3, 8, 5, 6]. What I did is: a = [-2,1,5,3,8,5,6] b = [1,2,5] c = [ a[i] … Read more
Is it possible, using jQuery, to find out the type of an element with jQuery? For example, is the element a div, span, select, or input? For example, if I am trying to load values into a drop-down list with jQuery, but the same script can generate code into a set of radio buttons, could … Read more
How can I reference the script element that loaded the javascript that is currently running? Here’s the situation. I have a “master” script being loaded high in the page, first thing under the HEAD tag. <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”> <html xmlns=”http://www.w3.org/1999/xhtml” xml:lang=”en” lang=”en”> <head> <script type=”text/javascript” src=”https://stackoverflow.com/questions/403967/scripts.js”></script> There is a script … Read more
This question already has answers here: How to get names of enum entries? (41 answers) Closed 5 years ago. What is the proper way to loop through literals of an enum in TypeScript? (I am currently using TypeScript 1.8.1.) I’ve got the following enum: export enum MotifIntervention { Intrusion, Identification, AbsenceTest, Autre } export class … Read more
Using jQuery, how can I get the input element that has the caret’s (cursor’s) focus? Or in other words, how to determine if an input has the caret’s focus? 8 Answers 8
What I’m trying to do is to count all of the elements in the current page with the same class and then I’m going to use it to be added onto a name for an input form. Basically I’m allowing users to click on a <span> and then by doing so add another one for … Read more
