How should I call functions in order to execute them one after the other?

Question

I am trying to develop mobile application and I use the framework (PhoneGap), I have sql operation so I choose this separate, and each operation put under a function and these functions will be called in order.

my problem that these functions are not calling in order

Functions that have to be called in specific order is not a good design. If they have to be called in order, the code should be structured so that you can't call them out of order by mistake. — Jan Hudec, Nov 12 '12 at 08:37
Well, you didn't include any sample, so I can't show you anything specific. — Jan Hudec, Nov 12 '12 at 08:42
a) Sample is best provided by _editing the question_, since you can format it nicely there. b) That's even uglier design than I thought, but without seeing what those functions are nobody can suggest a better one. — Jan Hudec, Nov 12 '12 at 09:40

score 3 · Answer 1 · answered Nov 12 '12 at 08:33

3

JavaScript SQL libraries tend to be asynchronous and use callbacks. Put the call to the next function in the callback you use in the previous function.

answered Nov 12 '12 at 08:33

Quentin

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I have already done that, but at some point I need to call more than one function in a loop. – Azeaze Azeaze Nov 12 '12 at 08:36
for(i=0;i – Azeaze Azeaze Nov 12 '12 at 08:37
See [Whats the smartest / cleanest way to iterate async over arrays (or objs)?](http://stackoverflow.com/questions/8413857/whats-the-smartest-cleanest-way-to-iterate-async-over-arrays-or-objs) – Quentin Nov 12 '12 at 08:41

score 0 · Answer 2 · answered Nov 12 '12 at 08:39

Javascript code is generally asynchronous, to ensure code execution order generally callbacks are used, a function in a library may look like this:

function doWork(params, callback){
  //do stuff

  //when done call the callback function
  callback()
}

This allows you to use this function and pass a function to be called when this function has finished doing what it needs to do.

doWork(params, function() { 
  //this code is not executed until doWork has completed and called its callback 
})

Have a look at the library you are using they probably use callbacks

How should I call functions in order to execute them one after the other?

2 Answers2