asked on 5/17/2011

Firefox addon: Checking, setting and getting from localstorage

Hi!

In the Google Chrome browswer this works perfectly:

if(localStorage['list_expiry_date'] === undefined) 
{alert("in local storage");
localStorage['list_expiry_date'] ="P";}
else
		{alert("Local storage exists and has the value of: "+localStorage['list_expiry_date']);}

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But in firefox 4 it's throwing an error, so my question is:
How do you
1- check to see if localStorage['list_expiry_date'] already exists?
2- set the value for localStorage['list_expiry_date']
3-get the value from localStorage['list_expiry_date']

Thanks!

JavaScript Web Browsers Web Development

Last Comment

CrAppl

5/17/2011

GregArnott

5/17/2011

I believe Firefox uses the syntax localStorage.getItem() for its Storage
Thus:

//  1- check to see if localStorage['list_expiry_date'] already exists?
if(   localStorage.getItem('list_expiry_date') ) {

}

// 2- set the value for localStorage['list_expiry_date']
 localStorage.setItem('list_expiry_date', value)

// 3-get the value from localStorage['list_expiry_date']
 localStorage.getItem('list_expiry_date')

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GregArnott

5/17/2011

Found this link which may help:
Firefox and Storage

CrAppl

5/17/2011

ASKER

Thanks for replying!

This is the error I gett when running that code:

Error: uncaught exception: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIDOMStorageWindow.localStorage]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: chrome://quickfilter/content/quickfilter.js :: <TOP_LEVEL> :: line 93" data: no]

The exact code is:

if(   localStorage.getItem('list_expiry_date') )
{
	alert("in local storage");
	localStorage.setItem('list_expiry_date',"P")
}
else
		{alert("Local storage exists and has the value of: "+localStorage.getItem('list_expiry_date'));}

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Do I have to have some code before that that specifies that I am using localstorage or soemthing?

ASKER CERTIFIED SOLUTION

FireAnICE

5/17/2011