Help Using LocalStorage

[BillHubbard]

I want to set up a cache of static data in local storage, but am stumbling over a couple of fundamentals:

• How do I check to see if the current browser supports local storage?
• How do I check local storage to see if my data is already there?

Thanks

[skirtle]

To answer your first question, checking whether it is supported is not as easy as it should be due to a FF bug. See:

http://diveintohtml5.org/detect.html

I'm not sure I understand your second question. What problem are you trying to solve with this check? How does this fit into an ExtJS context?

[mitchellsimoens]

Probably would be nice to have it in Ext.supports...

Ext.supports.LocalStorage = 'localStorage' in window && window['localStorage'] !== null;

[skirtle]

Agreed, though from what I've read it seems you need to wrap it in a try/catch for old FF. From a quick search of the ExtJS code it seems that this pattern is used for detecting local storage, just not assigned to Ext.supports.

[BillHubbard]

Thanks. As to my second question, I'm populating a local store with relatively static data retrieved from the server. I want to check if the local store has already been populated so I know whether to retrieve it from the server. I wound up having to read from the local store (which returns a success whether the data is there or not) and checking the record count. I thought there must be a more straightforward way to test for this.