Javascript Stored Variable after page refresh

Question

I'm having a problem relating to storing a variable within Javascript. I have a web monitoring page (I have written the code which works), which refreshes automatically every 5 mins.

If one of the sites I am monitoring goes down, the JS sends an email to the admin, but I only want to send this once.

My logic was to:

Check if a site is down if variable emailPreviouslySent == 'no' then send email to admin write to variable emailPreviouslySent = 'yes'

Page would refresh

Check if a site is down emailPreviouslySent == 'yes'

email would not be sent again

However I'm finding that the variable is emptied each time the page refreshes.

Is there a way of carrying the variable even though the page is refreshing, or perhaps another way around this?

Thanks for your help.

Have you tried cookies ?

Clyde Lobo
– Clyde Lobo

2012-06-20 15:22:56 +00:00
Commented Jun 20, 2012 at 15:22 — Clyde Lobo
– Clyde Lobo, Commented Jun 20, 2012 at 15:22
You can usecookies, or HTML5 local storage.

XCS
– XCS

2012-06-20 15:23:37 +00:00
Commented Jun 20, 2012 at 15:23 — XCS
– XCS, Commented Jun 20, 2012 at 15:23

Sarfraz · Accepted Answer · 2012-06-20 15:22:59Z

4

However I'm finding that the variable is emptied each time the page refreshes.

You are inside state-less HTTP request. Store your variable in cookie to retain its value even after page refresh but notice that a cookie can be deleted by a user too.

Or as rightly suggested by @Matt Ball, a better approach would be to use HTML5's localStorage feature.

answered Jun 20, 2012 at 15:22

Sarfraz

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3 Comments

Rexxo Over a year ago

That fast, thanks. Not looked into cookies, however that may be the way to go, as I'm (sadly) forced to use IE.

Ben Everard Over a year ago

May I suggest taking a look at store.js (github.com/frankkohlhepp/store-js), it makes using localStorage nice and easy. And I believe it has solutions for working with IE6 and above :-)

Sarfraz Over a year ago

@BenEverard: Ah have used that, it does the job well. Thanks for adding.

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