CODEWITHSUNDEEP
javascriptfunctionparametersargumentsclosures
Lucia
Lucia

Reputation: 4767

Passing a function with arguments as an argument?

Is it possible to pass a javascript function with arguments as an argument?

Example:

$(edit_link).click( changeViewMode( myvar ) );

Upvotes: 196

Views: 139568

Answers (7)

Christian Bartram
Christian Bartram

Reputation: 411

Or if you are using es6 you should be able to use an arrow function 

$(edit_link).click(() => changeViewMode(myvar));

Upvotes: 17

erionpc
erionpc

Reputation: 398

This is an example following Ferdinand Beyer's approach:

function function1()
{
    function2(function () { function3("parameter value"); });
}
function function2(functionToBindOnClick)
{
    $(".myButton").click(functionToBindOnClick);
}
function function3(message) { alert(message); }

In this example the "parameter value" is passed from function1 to function3 through function2 using a function wrap.

Upvotes: 2

Alexandr Sargsyan
Alexandr Sargsyan

Reputation: 724

You can do this

var message  = 'Hello World';

var callback = function(){
alert(this)
}.bind(message);

and then

function activate(callback){
  callback && callback();
}

activate(callback);

Or if your callback contains more flexible logic you can pass object.

Demo

Upvotes: 3

Michał Perłakowski
Michał Perłakowski

Reputation: 92461

Use Function.prototype.bind(). Quoting MDN:

The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

It is supported by all major browsers, including IE9+.

Your code should look like this:

$(edit_link).click(changeViewMode.bind(null, myvar));

Side note: I assume you are in global context, i.e. this variable is window; otherwise use this instead of null.

Upvotes: 53

Clyde
Clyde

Reputation: 8145

No, but you can pass one without parameters, and do this:

$(edit_link).click(
  function() { changeViewMode(myvar); }
);

So you're passing an anonymous function with no parameters, that function then calls your parameterized function with the variable in the closure

Upvotes: 19

Philippe Leybaert
Philippe Leybaert

Reputation: 171734

Yes, like this:

$(edit_link).click(function() { changeViewMode(myvar) });

Upvotes: 8

Ferdinand Beyer
Ferdinand Beyer

Reputation: 67137

Use a "closure":

$(edit_link).click(function(){ return changeViewMode(myvar); });

This creates an anonymous temporary function wrapper that knows about the parameter and passes it to the actual callback implementation.

Upvotes: 309

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