Running functions with parameters in AngularJS using $timeout: What you need to know

Question

Running functions with parameters in AngularJS using $timeout: What you need to know

Within my AngularJS controller, I have a function that looks like this;

polling_interval=1000;
var poll = function() 
{
  //Execution code
  $timeout(poll, polling_interval); 
}; 
poll();

This function uses the $timeout service in AngularJS to call itself continuously. However, when I tried adding parameters to the function, it resulted in an error. Here is the code with added parameters;

polling_interval=1000;
var poll = function(param1, param2) 
{
  //Execution code
  $timeout(poll(param1, param2), polling_interval); 
}; 
poll(param1, param2);

The syntax used for adding parameters was not correct and now I am unsure about how to proceed. Is there a way to execute the function with parameters while using $timeout in AngularJS? If not, are there any alternative solutions to allow my poll function to accept parameters?

javascript angularjs

Answer 1

Answer №1

The $timeout function in Angular serves as a wrapper for window.setTimeout, allowing for the passing of additional parameters to the specified function when timed out.

According to the AngularJS API:

$timeout([fn], [delay], [invokeApply], [Pass]);

[fn] (function) refers to your desired function
[delay] (number) indicates the delay in milliseconds
[invokeApply] (boolean) defaults to true. If set to true, the function is executed within $apply, while false skips model dirty checking.
[Pass] allows for additional parameters to be passed to the function.

Here's an example of how your code should be structured:

polling_interval = 1000;
var poll = function(param1, param2){
    //Code to be executed
    $timeout(poll, polling_interval, true, param1, param2); 
}; 
poll(param1, param2);

This method ensures proper handling of parameter passing to timed-out functions. I trust you will find this information valuable.

UPDATE: This functionality was introduced on January 22, 2015 (v1.4.1). Prior to that version, the recommended approach would have been:

polling_interval = 1000;
var poll = function(param1, param2){
    //Code execution
    $timeout(poll.bind(null, param1, param2), polling_interval); 
}; 
poll(param1, param2);

Answer 2

The $timeout function in Angular serves as a wrapper for window.setTimeout, allowing for the passing of additional parameters to the specified function when timed out.

According to the AngularJS API:

$timeout([fn], [delay], [invokeApply], [Pass]);

[fn] (function) refers to your desired function
[delay] (number) indicates the delay in milliseconds
[invokeApply] (boolean) defaults to true. If set to true, the function is executed within $apply, while false skips model dirty checking.
[Pass] allows for additional parameters to be passed to the function.

Here's an example of how your code should be structured:

polling_interval = 1000;
var poll = function(param1, param2){
    //Code to be executed
    $timeout(poll, polling_interval, true, param1, param2); 
}; 
poll(param1, param2);

This method ensures proper handling of parameter passing to timed-out functions. I trust you will find this information valuable.

UPDATE: This functionality was introduced on January 22, 2015 (v1.4.1). Prior to that version, the recommended approach would have been:

polling_interval = 1000;
var poll = function(param1, param2){
    //Code execution
    $timeout(poll.bind(null, param1, param2), polling_interval); 
}; 
poll(param1, param2);

Answer 3

Answer №2

To ensure that the first parameter type of $timeout is a function, you should structure your code in the following manner:

polling_interval=1000;
var poll = function(param1, param2) 
{
  //Code to be executed
  $timeout(function() {poll(param1, param2)}, polling_interval); 
}; 
poll(param1, param2);

Answer 4

To ensure that the first parameter type of $timeout is a function, you should structure your code in the following manner:

polling_interval=1000;
var poll = function(param1, param2) 
{
  //Code to be executed
  $timeout(function() {poll(param1, param2)}, polling_interval); 
}; 
poll(param1, param2);

Answer 5

Answer №3

The most straightforward approach would likely involve utilizing an anonymous function.

update_interval=1000;
var update = function(arg1, arg2) 
{
  //Implementation logic
  $timeout(function () { update(arg1, arg2) }, update_interval); 
}; 
update(arg1, arg2);

Answer 6

The most straightforward approach would likely involve utilizing an anonymous function.

update_interval=1000;
var update = function(arg1, arg2) 
{
  //Implementation logic
  $timeout(function () { update(arg1, arg2) }, update_interval); 
}; 
update(arg1, arg2);

Running functions with parameters in AngularJS using $timeout: What you need to know

Answer №1

Answer №2

Answer №3

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