Possible Duplicate:
how to empty an array in JavaScript
How to remove all items from jQuery array?
I have array var myArray = [];, I want to clear all items in this array on every post back.
4 Answers
Simplest thing to do is just
myArray = []; again.
edit — as pointed out in the comments, and in answers to other questions, another "simplest thing" is
myArray.length = 0; and that has the advantage of retaining the same array object.
5 Comments
jAndy
not enough jQuery.
Pointy
well he could always call it
$myArray
starbeamrainbowlabs
@jAndy I don't think that you need jQuery for everything.....
James Allardice
@starbeamrainbowlabs - It was a joke, most likely a reference to this.
Marius Balčytis
This does NOT empty an array. This just assigns NEW empty array to that variable.
.length solution works fine, while this does not in this use-case: var obj = {arr: []}; var a = obj.arr; a.push('elem'); a.length = 0; console.log(obj); vs var obj = {arr: []}; var a = obj.arr; a.push('elem'); a = []; console.log(obj);you can remove all item in myArray using array length, it's common pattern.
try this
var myArray = [1, 2, 3]; myArray.length = 0; // remove all item 
Comments
To clear the array values you can do a simple:
myarray = []; P.s.
jQuery != javascript 
Comments
There is no such thing as a jQuery array, that's just a javascript array. When a page posts back, it re-renders and all of the javascript is re-run, you don't need to clear the contents of the array.
if, during execution of the page, you wanted to clear a javascript array, just re-initialize it as a new, blank array:
myArray = []; // no var, we are just initializing not declaring 
jQueryarray.