The callback function can always set a non local variable so it's
visible by the other functions. Although you might as well go for a
better pattern depending on the needs of your extension.
Ernest
On Sun, Jan 3, 2010 at 5:25 PM, Erek Speed <melin...@gmail.com> wrote:
> Hi,
>
> So I realized this was working but that my code which checked the
> variable was running before the callback.
>
> This lead to a different problem where I can't ever know the status of
> a message in the same function that sent the message. Or even in a
> few functions later due to the delay.
>
> I tried to get synchronous messages by spinning in a loop checking a
> status variable, but it seems that in JS, while the loop is running
> nothing else happens. Probably because the extension is all in one
> thread.
>
> Right now, I'm planning on refactoring my code to a more chrome
> friendly manner but it seems that it could be good to be able to know
> the that a message succeeded at some specified point of time instead
> of a vague time in the future.
>
> Erek
>
> On Sat, Jan 2, 2010 at 6:48 AM, Erek Speed <melin...@gmail.com> wrote:
>> I want to set a variable from inside my callback to a sendRequest
>> function.
>>
>> The mappy extension gives an example of doing this but I can't seem to
>> manage it using global or local variables.
>>
>> Here's mappy's code for reference:
>> <script>
>> // Global accessor that the popup uses.
>> var addresses = {};
>> var selectedAddress = null;
>> var selectedId = null;
>>
>> function updateAddress(tabId) {
>> chrome.tabs.sendRequest(tabId, {}, function(address) {
>> addresses[tabId] = address;
>> if (!address) {
>> chrome.pageAction.hide(tabId);
>> } else {
>> chrome.pageAction.show(tabId);
>> if (selectedId == tabId) {
>> updateSelected(tabId);
>> }
>> }
>> });
>> }
>> ...
>>
>> In the response function, address is changed which is convenient.
>> What is it about addresses that let's it retain value even in the
>> mystical space of messages?
>>
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>>
>>
>
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