What is the meaning of addHorizonLoadEvent(function() {...}) in the following snippet?
addHorizonLoadEvent(function() {
show_hide_datepickers();
});
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1It is an anonymous functionOptimusCrime– OptimusCrime2015-07-20 08:53:26 +00:00Commented Jul 20, 2015 at 8:53
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1addHorizonLoadEvent: " Added so that we can append Horizon scoped JS events to the DOM load events without running in to the "horizon" name-space not currently being defined since we load the scripts at the bottom of the page."Andreas– Andreas2015-07-20 08:54:50 +00:00Commented Jul 20, 2015 at 8:54
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2possible duplicate of Explain JavaScript's encapsulated anonymous function syntaxuser2864740– user28647402015-07-20 08:59:31 +00:00Commented Jul 20, 2015 at 8:59
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stackoverflow.com/questions/336859/…user2864740– user28647402015-07-20 09:03:28 +00:00Commented Jul 20, 2015 at 9:03
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@NeelabhSingh Could you accept an answer, please?corazza– corazza2015-07-22 14:43:35 +00:00Commented Jul 22, 2015 at 14:43
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3 Answers
addHorizonLoadEvent is a higher-order function -- that means it doesn't expect a non-function value (like a number, or a string) as it's argument, but another function. So the first argument is a new function, that will be called by the original function at some point (often at the end as a callback).
function() {...} is an anonymous function -- a way to express a function without binding it to a name.
Comments
This pattern is a called anonymous function.
function_name(function() {
// Code
});
Is the same as writing
function my_function() {
// Code
}
function_name(my_function);
Meaning that my_function is passed as an argument to the function function_name.
1 Comment
user2864740
Is similar to .. but is not "the same". I've linked some relevant questions.
In fact you give a function as parameter of addHorizonLoadEvent.
You could do that :
var fooBar = function() {
//alert("Alert2");
show_hide_datepickers();
});
addHorizonLoadEvent(fooBar);
And the function parameter you give to addHorizonLoadEvent will be used only one time, no need to give it a name, so it is an anonymous function, directly declared in ().
