{"id":545,"date":"2018-01-11T11:24:47","date_gmt":"2018-01-11T17:24:47","guid":{"rendered":"https:\/\/marcblase.com\/blog\/?p=545"},"modified":"2018-01-11T11:31:26","modified_gmt":"2018-01-11T17:31:26","slug":"javascript-test-for-element-visibility-in-viewport","status":"publish","type":"post","link":"https:\/\/ma.rcbla.se\/blog\/2018\/01\/javascript-test-for-element-visibility-in-viewport\/","title":{"rendered":"Javascript Test for element visibility in viewport"},"content":{"rendered":"<p>A couple different ideas on a theme.<\/p>\n<p>\/\/ Works once the whole element is in the viewport<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\nfunction isScrolledIntoView(elem){\r\n    var docViewTop = $(window).scrollTop();\r\n    var docViewBottom = docViewTop + $(window).height();\r\n\r\n    var elemTop = $(elem).offset().top;\r\n    var elemBottom = elemTop + $(elem).height();\r\n\r\n    return ((elemBottom &lt;= docViewBottom) &amp;&amp; (elemTop &gt;= docViewTop));\r\n}\r\n<\/pre>\n<p>\/\/ Works while any part of the element is in the viewport.<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\nfunction isInViewport(elem) {\r\n    var elementTop = elem.offset().top;\r\n    var elementBottom = elementTop + elem.outerHeight();\r\n    \r\n    var viewportTop = $(window).scrollTop();\r\n    var viewportBottom = viewportTop + $(window).height();\r\n    \r\n    return elementBottom &gt; viewportTop &amp;&amp; elementTop &lt; viewportBottom;\r\n}\r\n<\/pre>\n<p>Usage:<\/p>\n<pre class=\"brush: plain; title: ; notranslate\" title=\"\">\r\n$(window).scroll(function() {\r\n    if ( isInViewport($(&lt;element_to_check&gt;))){\r\n        \/\/ DO SOMETHING\r\n    }\t\t\r\n});\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>A couple different ideas on a theme. \/\/ Works once the whole element is in the viewport function isScrolledIntoView(elem){ var docViewTop = $(window).scrollTop(); var docViewBottom = docViewTop + $(window).height(); var elemTop = $(elem).offset().top; var elemBottom = elemTop + $(elem).height(); return ((elemBottom &lt;= docViewBottom) &amp;&amp; (elemTop &gt;= docViewTop)); } \/\/ Works while any part of the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,3],"tags":[],"class_list":["post-545","post","type-post","status-publish","format-standard","hentry","category-coding","category-discoveries"],"_links":{"self":[{"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/posts\/545","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/comments?post=545"}],"version-history":[{"count":4,"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/posts\/545\/revisions"}],"predecessor-version":[{"id":549,"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/posts\/545\/revisions\/549"}],"wp:attachment":[{"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/media?parent=545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/categories?post=545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ma.rcbla.se\/blog\/wp-json\/wp\/v2\/tags?post=545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}