{"id":84,"date":"2023-08-25T17:22:19","date_gmt":"2023-08-25T17:22:19","guid":{"rendered":"\/\/api.jquery.com\/?p=84"},"modified":"2024-04-20T18:06:37","modified_gmt":"2024-04-20T18:06:37","slug":"callbacks.empty","status":"publish","type":"post","link":"https:\/\/api.jquery.com\/callbacks.empty\/","title":{"rendered":"callbacks.empty()"},"content":{"rendered":"<article id=\"callbacks-empty1\" class=\"entry method\"><h2 class=\"section-title\">\n<span class=\"name\">callbacks.empty()<\/span><span class=\"returns\">Returns: <a href=\"http:\/\/api.jquery.com\/Types\/#Callbacks\">Callbacks<\/a><\/span>\n<\/h2>\n<div class=\"entry-wrapper\">\n<p class=\"desc\"><strong>Description: <\/strong>Remove all of the callbacks from a list.<\/p>\n<ul class=\"signatures\"><li class=\"signature\">\n<h4 class=\"name\">\n<span class=\"version-details\">version added: <a href=\"\/category\/version\/1.7\/\">1.7<\/a><\/span><a id=\"callbacks-empty\" href=\"#callbacks-empty\"><span class=\"icon-link\"><\/span>callbacks.empty()<\/a>\n<\/h4>\n<ul><li><div class=\"null-signature\">This method does not accept any arguments.<\/div><\/li><\/ul>\n<\/li><\/ul>\n<div class=\"longdesc\" id=\"entry-longdesc\">\n    <p>This method returns the Callbacks object onto which it is attached (<code>this<\/code>).<\/p>\n  <\/div>\n<section class=\"entry-examples\" id=\"entry-examples\"><header><h2>Example:<\/h2><\/header><div class=\"entry-example\" id=\"example-0\">\n<p>Use <code>callbacks.empty()<\/code> to empty a list of callbacks:<\/p>\n<div class=\"syntaxhighlighter javascript\">\n\t<table>\n\t\t<tbody>\n\t\t\t<tr>\n\t\t\t\t\n\t\t\t\t<td class=\"gutter\">\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n1\">1<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n2\">2<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n3\">3<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n4\">4<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n5\">5<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n6\">6<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n7\">7<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n8\">8<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n9\">9<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n10\">10<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n11\">11<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n12\">12<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n13\">13<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n14\">14<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n15\">15<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n16\">16<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n17\">17<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n18\">18<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n19\">19<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n20\">20<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n21\">21<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n22\">22<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n23\">23<\/div>\n\t\t\t\t\t\n\t\t\t\t\t\t<div class=\"line n24\">24<\/div>\n\t\t\t\t\t\n\t\t\t\t<\/td>\n\t\t\t\t\n\t\t\t\t<td class=\"code\">\n\t\t\t\t\t<pre><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ A sample logging function to be added to a callbacks list<\/span><\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-keyword\">var<\/span> foo = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\"> value1, value2 <\/span>) <\/span>{<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>  <span class=\"hljs-built_in\">console<\/span>.log( <span class=\"hljs-string\">\"foo: \"<\/span> + value1 + <span class=\"hljs-string\">\",\"<\/span> + value2 );<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>};<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code> <\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ Another function to also be added to the list<\/span><\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-keyword\">var<\/span> bar = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\"> value1, value2 <\/span>) <\/span>{<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>  <span class=\"hljs-built_in\">console<\/span>.log( <span class=\"hljs-string\">\"bar: \"<\/span> + value1 + <span class=\"hljs-string\">\",\"<\/span> + value2 );<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>};<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code> <\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-keyword\">var<\/span> callbacks = $.Callbacks();<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code> <\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ Add the two functions<\/span><\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>callbacks.add( foo );<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>callbacks.add( bar );<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code> <\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ Empty the callbacks list<\/span><\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code>callbacks.empty();<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code> <\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ Check to ensure all callbacks have been removed<\/span><\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-built_in\">console<\/span>.log( callbacks.has( foo ) );<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ false<\/span><\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-built_in\">console<\/span>.log( callbacks.has( bar ) );<\/code><\/div><\/div><div class=\"container\"><div class=\"line\"><code><span class=\"hljs-comment\">\/\/ false<\/span><\/code><\/div><\/div><\/pre>\n\t\t\t\t<\/td>\n\t\t\t<\/tr>\n\t\t<\/tbody>\n\t<\/table>\n<\/div>\n\n<\/div><\/section>\n<\/div><\/article>","protected":false},"excerpt":{"rendered":"<p>Remove all of the callbacks from a list.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,96],"tags":[],"class_list":["post-84","post","type-post","status-publish","format-standard","hentry","category-callbacks-object","category-96"],"_links":{"self":[{"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/posts\/84","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/comments?post=84"}],"version-history":[{"count":2,"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/posts\/84\/revisions"}],"predecessor-version":[{"id":748,"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/posts\/84\/revisions\/748"}],"wp:attachment":[{"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/media?parent=84"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/categories?post=84"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/api.jquery.com\/wp-json\/wp\/v2\/tags?post=84"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}