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Why Javascript callbacks are asynchronous and how it works into the javascript engine ?
Why Javascript callbacks are asynchronous
They don't have to be, but if the function that accepts a callback isn't asynchronous then you might as well just get the data using a return value instead.
and how it works into the javascript engine ?
Usually by binding an event listener.
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Closed 8 years ago.
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Q framework is very famous( more than 7k stars on github), could someone tell me what does Q mean?
I have googled around and checked its official doc, but not found any clue...
It's pretty much explained in the doc.
The callback approach is called an “inversion of control”. A function that accepts a callback instead of a return value is saying, “Don’t call me, I’ll call you.”. Promises un-invert the inversion, cleanly separating the input arguments from control flow arguments. This simplifies the use and creation of API’s, particularly variadic, rest and spread arguments.
You might want to read more regarding callback hell and how that relates to using control flow libraries like Q, and how Promises fit in.
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I need to pass an array as a function argument from php to js.I need a way to pass them to the function.Can anyone please help me with this. Thanks a lot..
Convert your PHP array to JS Object (in JSON).
var obj = <?= json_encode($phpArr); ?>;
myAwesomeFunction(obj);
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In my phonegap application i like to call this function, where i should this piece of code whether inside the receiver or inside third party plugin
https://stackoverflow.com/a/18072720/1482099
You have no reason to call this function.
You should be aware that GCMRegistrar is deprecated. In addition, the getRegisterOnServerLifespan wasn't very useful even when it wasn't deprecated.
BTW, that method has nothing to do with the question that the answer in your link was supposed to answer. It returns an arbitrary time period after which the registration ID is considered expired, while the question was about expiration of the API key.
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Hi I am almost new on titanium, iPhone and JS development,
I don't know how to call a function from one .js to another .js in tab group.
I have a callback in app.js and i want to call a function from another .js in tab group.
How can i do it?
Thank you
you can do two things :
1> you can pass that function to a window from where you can call that function.
2> you can use custom addEventListener to call from another window like below.
app.js
function test(){
alert('Hello from Function');
Ti.App.addEventListener('callTest',test);
}
===================
another.js
Ti.App.fireEvent('callTest');
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want these things when a function call :
1.Open a text file (not visible to user)
2.Select a Text which is to be change
3.change the text
4.And save it at same place.
This is not possible in JavaScript. JavaScript is sandboxed by the browser and doesn't have access to the local computer.
Also, what you're trying to do sounds dodgy, and may well be the exact reason why it's sandboxed.