Javascript variable loses value

Question

I have a problem with a static variable. If the page is refreshed, the last value of the variable is lost. This is the code:

var ok;

alert(ok);

if(ok==1) {
$('tr:has(td:contains("Blue"))').hide()
}

$('tr:has(td:contains("Blue"))').delay(10000).hide(0)
    ok=1;   

alert(ok);

Do you know how javascript works? Why do you think it would save everything you're doing? Do you know how computers work? Why do you think rebooting a computer fixes quite a few issues? (*hint; because all it knew, except for what is **specifically remembered** is forgotten, just like javascript*) — h2ooooooo, Mar 04 '16 at 10:07

score 3 · Answer 1 · answered Mar 04 '16 at 10:05

If the page is refreshed, the last value of the variable is lost.

When the page is refreshed, all the values stored in that window's session is lost and a new sesssion is created.

Unless you store the values in your browser's storage, you are not going to retain them.

score 1 · Answer 2 · answered Mar 04 '16 at 10:24

When you refresh a page, all stored values are lost thought its possible to retain the variable value.This is possible with window.localStorage (or window.sessionStorage). The difference is explained at MDN's DOM storage guide (linked below).

When you need to set a variable that should be reflected in the next page(s), use:

var someVarName = "value";

localStorage.setItem("someVarName", someVarName);

And in any page (like when the page has loaded), get it like:

 var someVarName = localStorage.getItem("someVarName");

.getItem() will return null or the value stored.

Note that only string values can be stored in this storage, but this can be overcome by using JSON.stringify and JSON.parse. Technically, whenever you call .setItem(), it will call .toString() on the value and store that.

MDN's DOM storage guide (linked below), has workarounds/polyfills, that end up falling back to stuff like cookies, if localStorage isn't available.

It wouldn't be a bad idea to use an existing, or create your own mini library, that abstracts the ability to save any data type (like object literals, arrays, etc.).

check http://stackoverflow.com/questions/16206322/how-to-get-js-variable-to-retain-value-after-page-refresh — Newton Sheesha, Mar 04 '16 at 10:25

Javascript variable loses value

2 Answers2