callbacks.add.xml

<?xml version="1.0"?>
<entry name="callbacks.add" type="method" return="Callbacks">
  <title>callbacks.add()</title>
  <signature>
    <added>1.7</added>
    <argument name="callbacks">
      <desc>A function, or array of functions, that are to be added to the callback list.</desc>
      <type name="Function"/>
      <type name="Array"/>
    </argument>
  </signature>
  <desc>Add a callback or a collection of callbacks to a callback list.</desc>
  <longdesc>
    <p>This method returns the Callbacks object onto which it is attached (<code>this</code>). </p>
    <h2 id="example-1">Example</h2>
    <p>Use <code>callbacks.add()</code> to add new callbacks to a callback list:</p>
    <pre><code><![CDATA[// a sample logging function to be added to a callbacks list
var foo = function( value ) {
  console.log( "foo: " + value );
};

// another function to also be added to the list
var bar = function( value ){
  console.log( "bar: " + value );
};

var callbacks = $.Callbacks();

// add the function "foo" to the list
callbacks.add( foo );

// fire the items on the list
callbacks.fire( "hello" );
// outputs: "foo: hello"

// add the function "bar" to the list
callbacks.add( bar );

// fire the items on the list again
callbacks.fire( "world" );

// outputs:
// "foo: world"
// "bar: world"
]]></code>
</pre>
  </longdesc>
  <category slug="callbacks-object"/>
  <category slug="version/1.7"/>
</entry>